November 2016 Weather highlights, summary and data for Gaithersburg Maryland

NOVEMBER 2016 – GAITHERSBURG 2 WNW MARYLAND
BRIEF SUMMARY STATISTICS FOR THE NJWO BLOG
by Kevin Shaw, Observer in charge

Average high temperature 58.7° (+ 3.5°)
Average low temperature 37.7° (+ 3.0°)
Mean temperature 48.2° (+ 3.2°)
Precipitation 2.19″ (- 1.63″)
Greatest daily amount (date) 1.59″ (30)
Year to date precipitation 37.10″ (- 4.37″)
High temperature for the month (date) 74° (2,3)
Low temperature for the month (date) 26° (23)
Highest barometric pressure (date) 30.54″ (7)
Lowest barometric pressure (date) 29.54″ (30)
Peak wind gust (date/direction): 29 (20/WSW)
Heating degree days for the month: 505
Cooling degree days for the month: 0
Greatest diurnal range (date): 34.8° (8)
Least diurnal range (date): 7.1° (20)
Number of days:
Fog: 2 (both days dense)
Thunder: 0
Sunny/clear days:12 Partly Cloudy days:6 Cloudy days:12

Days with measurable precipitation (=>.01″) = 6
Days with maximum temperatures of 70° or more = 2
Days with minimum temperatures of 32° or less = 8

NOVEMBER 2016 MONTHLY SUMMARY
GAITHERSBURG 2 WNW MARYLAND
by Kevin Shaw, observer in charge

November 2016 was warm and dry, the 9th such monthly
pattern in my 38 years of Novembers. However, it fell
short of being the driest November ever, as the last 2
days of the month provided for over 88% of the month’s
total precipitation (1.94″ 2 day total vs. 2.19″ monthly
total). The 1.59″ daily amount on the last day of the month
was the wettest day of the month by far, and also set a daily record precipitation amount for the date. Statistically
November 2016 was the 8th driest November on record.
Temperature-wise the month fell in the middle of the pack
both on the max, min and mean side of the ledger. One
temperature record was set during our warmest spell of the
month, with the 55° min temp on the 3rd setting a record
for the highest minimum temperature for the date. The min
temperature for the month of 26° on the 23rd was a warm
extreme monthly min, most Novembers in the past have at
least dropped into the low 20s if not the teens by the end
of November. 6 days of measurable precipitation and 8
days of 32 or lower mins both were well below the normal
amounts of 9.6 and 13 days. No snow month was the 14th
time that has occurred.

November 2016 featured more above normal temperatures but
not to the extent of previous warm months. The most notable
temperature fact during the month was the first 32° min of the season was recorded on November 8, which tied 2014 for the
latest first freeze date of the season.

Most of the month was also quite dry as only 0.25″ fell during the first 28 days of the month. We were headed towards an all-time record dry November but the rains on the last 2 days of the month (1.94″) wiped out that possibility. Still considerably below normal (-1.63″) and the 8th driest November in my 38 period of record (POR). Measurable rain fell on only 6 days through out the month, only about half of the long-term average amount of 9.6 days. My current year to date precipitation total of 37.10″ through November 30 is 4.37″ below the normal amount of 41.47″.

The average maximum temperature for the month was 58.7°
(+3.4°), the average minimum temperature was 37.7° (+ 3.0°). The resultant mean average temperature for the month was
48.2° (+ 3.2°).

The month’s highest barometric pressure reading of 30.54″ on the 7th was at the end of the beginning of the month warm spell. The lowest pressure reading of the month of 29.54″ was on the last day of the month (30th) when we had our stormiest/wettest day of the month.

The distribution of 12 sunny, 6 partly cloudy and 12 cloudy days didn’t fit in as well as October with the generally dry conditions.

There were 505 heating degree days (HDD) and 0 cooling degree days during the month. I managed to catch two foggy days in November right at the end of the month during our two wettest days. Both days actually had dense fog at times, occurring around midnight to enable them to share with the two days. There were no thunderstorm days. The peak wind gust during the month was 29 MPH out of the WSW on the 20th and was our windiest day since early April. I had a total of five days with PWG readings above the 20 MPH mark. It was another generally calm month as 10 days recorded a PWG of 9 MPH or less, spread out fairly evenly throughout the month. The dominant daily wind direction was 23 days with a westerly component, followed by 7 days with a easterly component (mostly towards the end of the month).

My maximum temperature frequencies included 2 days at or above 70°, 12 days between 60° and 69°, 12 days between 50° and 59°, and 4 days in the 40s. On the minimum temperature frequency side of things, there were 4 days between 20° and 29°, 15 days between 30° and 39°, 8 days between 40° and 49°, and 3 days between 50° and 59°.

The diurnal range average actually a bit above normal, the first time it has done that in quite a while (21.0° vs the normal of 20.5°). The max daily range of 34.8° occurred on the 8th (67°-32°) on the day of our first freezing min of the fall season. There were 3 other days with ranges in the 30s, and an additional 15 days with daily ranges at or above 20°. The lowest daily temperature range of 7.1° (43°-36°) occurred on a cool, cloudy, damp day on the 20th. There were a total of 4 days with minimum daily temperature ranges less than 10°.

The tropics calmed down in November when it normally starts to wind down. There was one remarkable hurricane Otto at the end of November that formed way down in the southern Caribbean that only affected Central America. The remarkably strong storm also held together to move through the isthmus land mass and into the Pacific, maintaining its tropical characteristics enough to hold on to the storm name Otto through its total life. Our rainstorm at the end of the month wasn’t related to Otto at all, though it was a pretty warm storm. As we enter December now, it appears that we finally are getting into a wetter, colder pattern that may lead to some snow eventually. We shall see what develops. I may not be able to do another report like this for the
foreseeable future due to major personal changes. I am going to have to shut my personal weather station down sometime during the month for an unknown period of time. When it opens up again hopefully, it will be in a different location. With the close of November, I completed a full 38 years of precipitation records at my location, starting on December 1, 1978. My temperature records started on January 1, 1979. Seems like only yesterday! It has been quite a run!


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Stewartsville November 2016 Monthly Summary

stewartsville-2016-weather-data

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October 2016 Gaithersburg 2 WNW Maryland weather summary and statistics for the NJWO blog

OCTOBER 2016 – GAITHERSBURG 2 WNW MARYLAND
BRIEF SUMMARY STATISTICS FOR THE NJWO BLOG
by Kevin Shaw, Observer in charge

Average high temperature 68.7° (+ 3.5°)
Average low temperature 49.9° (+ 6.0°)
Mean temperature 59.3° (+ 4.7°)
Precipitation 0.78″ (- 2.72″) Greatest daily amount (date) 0.40″ (1)
Year to date precipitation 34.91″ (- 2.74″) High temperature for the month (date) 84° (19)
Low temperature for the month (date) 33° (26)
Highest barometric pressure (date) 30.52″ (11,26)
Lowest barometric pressure (date) 29.60″ (21)
Peak wind gust (date/direction): 26 (22/SW)
Heating degree days for the month: 204
Cooling degree days for the month: 28
Greatest diurnal range (date): 35.5° (29)
Least diurnal range (date) 2.9° (1)
Number of days:
Fog 3
Thunder: 0
Sunny/clear days: 13 Partly Cloudy days: 11 Cloudy days: 7

Days with measurable precipitation (=>.01″) = 5
Days with maximum temperatures of 80° or more = 5
Days with minimum temperatures in the 30s = 3

OCTOBER 2016 MONTHLY SUMMARY
GAITHERSBURG 2 WNW MARYLAND
by Kevin Shaw, observer in charge

October 2016 was noticeably dry and warm. It was the second
driest October ever, only surpassed by the meager 0.29″ that fell in all of October 2000. The mean temperature 59.3° was
the third warmest October in my 38 year period of record
(POR), only being surpassed by October 1984 (61.0°) and
October 2007 (62.1°). Several record daily high temperatures were set during the month, as were several high minimum
temperatures. The minimum temperature for the month (33.2°)
failed to reach the freezing mark for the ninth time in my POR, including a fifth time in very recent times, since 2009. I hit the 80° maximum temperature threshold five times during the month, including 4 times in a row during our mid-month heat wave from the 17th through the 20th. Similarly, I had 5 days during the month when I had minimum temperatures above the 60° mark.
Conversely, I only had 3 days during the month with minimum
temperatures in the 30s. Only the 33.2° reading on the 26th
managed to produce frost at my location. Fall colors were
delayed this season once again, and are only now approaching peak color in early November, forestalled by the mild overnight temperatures and lack of frost during the month.

October 2016 featured more near record-breaking warmth with
regard to average monthly temperatures for my 38 year period of record (POR). The average high temperature wasn’t quite as extreme but was the 5th warmest ever. 3 daily record high
temperatures were recorded – 83° on the 18th, 84° on the 19th, and 80° on the 30th. 2 daily record high minimum temperatures were set – 61° on the 19th and the warmest min of the month of 66° on the 20th of 66°. The average min temperature of 49.9° turned out to be the 3rd warmest in my POR, only surpassed by the 51.8° set in 2007 and 51.5° set back in 1984.

No other daily temperature or precipitation records were set during the month.

The entire month was warm and dry as only 0.78″ (-2.72″) of
rain fell to go along with the warm temperatures already discussed. Measurable rain fell on only 5 widely scattered days through out the month, only about half of the long-term average amount of 9.5 days. My current year to date precipitation total of 34.91″ through October 31 is 2.74″ below the normal amount of 37.65″.

The average maximum temperature for the month was 68.7°
(+3.3°), the average minimum temperature was 49.9° (+ 6.0°). The resultant mean average temperature for the month was
59.3° (+ 4.7°).

The month’s highest barometric pressure reading of 30.52″ twice, on the 11th on the first day of the month with min temperatures in the 30s, and then again on the 26th on the coolest day of the month. The lowest pressure reading of the month of 29.60″ on the 21st occurred on one of the rare rainy days of the month and when we transitioned out of our late season heat wave finally into more normal fall-like temperatures.

The distribution of 13 sunny, 11 partly cloudy and 7 cloudy days fit in with the generally dry conditions better than in September.

There were 204 heating degree days (HDD) and 28 cooling degree days. I managed to catch a few foggy days in October (3) during the slightly more damp first part of the month. There were no thunder storm days, below normal but fit in with the dry conditions during the month. The peak wind gust during the month was 26 MPH out of the SW on the 22nd was during our transitional period from summer warmth to more typical fall chill. I had two other days with PWG readings above the 20 MPH mark (25 on the 9th and 23 on the 30th). It was a generally calm month as 11 days recorded a PWG of 9 MPH or less, all but one of those days occurring in the first half of the month. The dominant daily wind direction was 16 days with a westerly component, followed by 13 days with a easterly component, 1 day with a northerly component, and 1 day with a southerly component. The first half of the month had more easterly component winds, and the second half conversely had more westerly component winds.

My maximum temperature frequencies included 5 days at or above 80°, 8 days between 70°and 79°, 16 days between 60° and 69° and 2 days below 60°. On the minimum temperature frequency side of things, there were 3 days between 30° and 39°, 13 days between 40° and 49°, 10 days between 50° and 59°, and 5 days 60° or above.

The diurnal range average was below normal (18.8° vs the normal of 21.5°). The max daily range of 35.5° occurred on the 29th (74°-38°) on the first transition day out of the biggest cool snap of the month into the last brief heat wave of the month. on the day before the final day of the month with an 80° max temp. There were no more days with ranges in the 30s, but an additional 12 days with daily ranges at or above 20°, including 9 days in a row (11th-20th during our mid-month heat wave). The lowest daily temperature range of 2.9° (63°-60°) occurred on our wettest day of the month on the 1st. The 1st and 2nd combined with the last 3 days of September into a modest streak of 5 days in a row with daily temperature ranges less than 10°. There were 2 additional days during October with minimum daily temperature ranges less than 10°.

The tropics really got active in late September with powerful Hurricane Matthew, ravaging Haiti and other Caribbean islands before moving into
the SE US areas in early October, and threatening our area briefly. With adjoining (but weaker) hurricane named Nicole interacting, we did have a generally damp, warm period during the first 10 or so days of the month, then giving way to a drier but continued warm spell for the next 10 days. Not till the last third of the month did we start getting more traditional fall-like weather but without much frost or any freezing temperatures. Fall color has finally been developing, a few weeks delayed in early November. Check back in a few weeks to see how the rest of November works out. I believe that tropical activity is basically over for this season. But watch out for our first snowflakes of the season, not far away !!!


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REISTERSTOWN MARYLAND – OCTOBER 2016 – MONTHLY CLIMATOLOGICAL SUMMARY

OCTOBER 2016 CLIMATOLOGICAL SUMMARY
FOR DOWNTOWN REISTERSTOWN MARYLAND
by NJWO Observer Ray Muller

Average maximum temperature 68.7°
Average minimum temperature 52.0°
Average mean temperature 60.4° (-4.6°)
High temperature 85° (19/1512)
Low temperature 35° (26/0603)
Max daily range in temperature 29° 76°-40° (29)
Min daily range in temperature 4° 60°-56° (2)
Min max temperature 57° (26/1427)
Max min temperature 66° (19/0655)
Max temperature of 80° or more 4
Min temperature of less that 40° 1

Monthly precipitation 2.07″ (-1.81″) Year-to-date precipitation (through 10/31) 35.44″(-2.89″) Max rain rate in 30 minutes 0.27″ (1)
Max precipitation in 12 hours 0.38″ (1)
Max precipitation in 24 hours 0.83″ (1)
Number of precipitation days with .01″ or more 9
Number of precipitation days wth .10″ or more 5
Number of precipitation days with .50″ or more 2
Number of precipitation days with 1.00″or more 0

Weather types
Fog 13
Dense Fog 3
Thunder 1
Haze 6

Pressure
Highest barometric pressure 30.45″ (26/1030)
Lowest barometric pressure 29.56″ (21/1327)

Winds

Daytime (0700-1900) average 8.3 MPH from the SSW
Fastest Mile and direction 34 MPH from 290° (22/1441)
Peak Wind Gust 41 MPH from WNW (22/1441)
Gale wind days 3
Damaging wind days 0
Number of days:
PWG 15-20 MPH 7
PWG 21-25 MPH 6
PWG 26-30 MPH 4
PWG 31-35 MPH 2
PWG 36-40+MPH 1

Relative Humidity
Minimum relative humidity 40% (26/1500)
Maximum relative humidity 100% on 10 separate days

Number of days with cloud-to-cloud and cloud-to-ground lightning 1

Character of day: Clear 8 Partly cloudy 15 Cloudy 8
Sky cover (sunrise to sunset): 5.2
Percent of possible sunshine (estimated): 48
Minimum visibility: 1/16 mile in dense fog (16/0600)

Cloud types (storm related only):
Fractostratus 10
Towering cumulus 4
Cumulonimbus 1
Mammatus 0
Altocumulus Castelatas 4

Remarks: Temperatures here at the City Office remained well above normal. Precipitation continued to be below normal for this month and for the year. Light frost was observed here at the City Office while heavier frost was reported outside the city with heavy frost in low-lying valleys, all on the 26th.


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42nd Northeastern Storm Conference – Formal Invitation

To whom it may concern,

The 42nd Northeastern Storm Conference will take place on March 10-12, 2017 at the Holiday Inn in Saratoga Springs, NY! Attached is the formal invitation for papers and announcement of the keynote speakers, abstract submission periods, and conference registration. Hope to see you at this long-held tradition in March!

Benjamin Frechette

Lyndon State AMS & NWA President

Chairperson of the 42nd Northeastern Storm Conference

Atmospheric Sciences Major

Lyndon State College | Class of 2018

Benjamin.Frechette

Forwarded by:

Mark Kramer, Chair

New York City/Long Island AMS Chapter

http://www.nws.bnl.org/meetings.html

P.S. With snow in the forecast for many areas of the NE, may as well think the Northeast Storm Conference.

42nd Northeastern Storm Conference – Formal Invitation.pdf

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September 2016 Gaithersburg 2 WNW Maryland weather summary and statistics for the NJWO blog

SEPTEMBER 2016 – GAITHERSBURG 2 WNW MARYLAND
BRIEF SUMMARY STATISTICS FOR THE NJWO BLOG
by Kevin Shaw, Observer in charge

Average high temperature 80.4° (+ 3.8°)
Average low temperature 63.4° (+ 7.1°)
Mean temperature 71.9° (+ 5.5°)
Precipitation 2.90″ (- 1.30″)
Greatest daily amount (date) 1.54″ (29)
Year to date precipitation 34.13″ (+ 0.02″)
High temperature for the month (date) 93° (10)
Low temperature for the month (date) 52° (25)
Highest barometric pressure (date) 30.32″ (16)
Lowest barometric pressure (date) 29.86″ (1)
Peak wind gust (date/direction): 19 (29/NE)
Heating degree days for the month: 14
Cooling degree days for the month: 220
Greatest diurnal range (date): 28.9° (23)
Least diurnal range (date) 3.8° (30)

Fog days: 4
Thunder: 3
Sunny/clear days: 10
Partly Cloudy days: 8
Cloudy days: 12

Days with measurable precipitation (=>.01″) = 7
Days with maximum temperatures of 90 or more = 6
Days with minimum temperatures of 70 or more = 4

SEPTEMBER 2016 MONTHLY SUMMARY
GAITHERSBURG 2 WNW MARYLAND
by Kevin Shaw, observer in charge

September 2016 featured record-breaking warmth with regard
to average mean and average minimum temperatures for my 38
year period of record. The average high temperature wasn’t
quite as extreme but was tied with 2010 as the 5th warmest ever. 3 daily record high temperatures of 92° on the 7th, 8th and 9th were set and 3 daily record high minimum temperatures of 72° were set on the 8th and 10th and 69° on the 19th. No other daily temperature or precipitation records were set during the month. Most of the month was warm and dry as only 0.94″ of rain fell through the 26th, but a late month rally where 1.96″ of rain fell on the last 4 days of the month got the month a lot closer to normal, and not close to any monthly minimum record. September frequently features a lot of heavy daily rainfall amounts from tropical activity, so the maximum monthly amount of 1.54″ that fell on the 29th didn’t come close to the daily record for that date (2.99″ in 2015). The heat during the month coincided roughly with this dry period, and the coolest temperatures of the month also went along with this end of the month wetter period. The lowest temperature of the month (52° on the 25th) is the warmest low temperature ever, surpassing the 51° set just last year in 2015.

Once again this month had a few monthly warm extremes ever
in my 38 year period of record. There were several daily
records set, with 3 maximum low temperature and 3 maximum
daily temperature records. I had the warmest September mean
temperature ever (71.9°) and the warmest average minimum
temperature (63.4°) ever. The maximum average temperature
(80.4°) only came in as tied with 2010 as the fifth warmest ever. The 6 days with maximum temperatures of 90° or greater was
quite a bit above the usual amount for September of just under 2 days. 7 days with measurable precipitation was predictably below the normal of about 9.5 days. The wettest day of the month of 1.51″ on the 29th failed to break a daily record, and no daily precipitation records were set. The highest temperature of the month of 93° was reached on the 10th but was not a daily record. The highest min temperature of the month was 73° on the 9th, but did not set a daily record for that date. No record low temperatures were set.

The average maximum temperature for the month was 80.4°
(+3.8°), the average minimum temperature was 63.4° (+ 7.1°). The resultant mean average temperature for the month was
71.9° (+ 5.5°).

The month’s total precipitation amount of 2.90″ was 1.30″ below the normal September amount of 4.20″. My current year to date precipitation total of 34.13″ through September 30 is 0.02″
below the normal amount of 34.15″.

The month’s highest barometric pressure reading of 30.32″ on the 16th occurred in the middle of the longest (10 days) period of no rain. The modest lowest pressure reading of the month of 29.86″ on the 1st occured on one of our 3 measurable rainy days during the first 26 days of the month.

The distribution of 10 sunny, 8 partly cloudy and 12 cloudy days only modestly fit in with the generally dry conditions found during most of the month, The period from the 2nd through the 25th
contained all 10 of the sunny days during the month.

There were 220 cooling degree days (CDD) and 14 heating degree days. I managed to catch a few foggy days in September (4) but I probably missed a few early morning occurrences when I was asleep. There were 4 thunderstorm days, just a tad above the long-term average amount of 2.3. The peak wind gust during the month was a modest 19 MPH out of the NE on the rainiest day of the month (29). It was a generally calm month as 8 days recorded a PWG of 9 MPH or less, including a very rare day on the 14th when no wind was recorded. Not sure if that really is valid. There were some indications that possibly something got temporarily stuck in the cups. The dominant daily wind direction was 17 days with a NNE to SSE component, followed
by 10 days with a westerly component, 2 days with a northerly component, and the one calm day.

My maximum temperature frequencies included 6 days at or above 90°, 12 days between 80° and 89°, 8 days between 70°and 79°, and 4 days
between 60° and 69°. On the minimum temperature frequency side of things, there were 7 days between 50° and 59°, 19 days between 60° and 69° and 4 days with minimum temperatures of 70° or greater.

The diurnal range average was below normal (17.0° vs the normal of
20.3°). The max daily range of 28.9° occurred on the 23rd on the last day of the month with an 80° max temp (88°-59°). There were an additional 10 days with daily ranges at or above 20°, The lowest daily temperature range of 3.8° (62°-58°) occurred on a cloudy, cool, damp day (coolest max temp of the month on the 30th). There were 4 days during September with daily temperature ranges less than 10°, including the last 3 days of the month.

The tropics appear to be getting active finally as we head into October, with record-breaking Matthew threatening our area for a time here in early October before veering elsewhere. Meanwhile cold fronts are finally becoming more frequent, and the first snows of the season have been appearing in the Rockies and out on the Northern Plains the past few days. Fall color has been slow to develop so far, but should get going soon. Check back in a few weeks to see how October works out. Please continue to watch the tropics closely for the next few weeks but also those stronger cold fronts with snow getting closer.


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REISTERSTOWN MARYLAND – SEPTEMBER 2016 – MONTHLY CLIMATOLOGICAL SUMMARY (corrected copy – supersedes previously sent post)

SEPTEMBER 2016 CLIMATOLOGICAL SUMMARY
FOR DOWNTOWN REISTERSTOWN MARYLAND
by NJWO Observer Ray Muller

Average maximum temperature 80.8°
Average minimum temperature 63.8°
Average mean temperature 72.3°
High temperature 93° (9)
Low temperature 52° (25)
Max daily range in temperature 26° 90°-64° (14)
Min daily range in temperature 3° 64°-61° (30)
Min max temperature 61° (30)
Max min temperature 77° (9)
Max temperature of 90° or more 5
Min temperature of 70° or more 4

Monthly precipitation 3.93″
Year-to-date precipitation (through 9/30) 33.37″
Max rain rate in 30 minutes 0.26″ (29)
Max precipitation in 12 hours 0.96″ (29)
Max precipitation in 24 hours 2.12″ (29)
Number of precipitation days with .01″ or more 7
Number of precipitation days wth .10″ or more 5
Number of precipitation days with .50″ or more 2
Number of precipitation days with 1.00″or more 1
Number of precipitation days with 2.00″or more 1

Weather types
Fog 12
Dense Fog 2
Thunder 3
Haze 6

Pressure
Highest barometric pressure 30.30″ (16)
Lowest barometric pressure 29.86″ (1)

Winds

Fastest Mile and direction 22 MPH from 060° (29/0806)
Peak Wind Gust 31 MPH from NE (29/0807)
Gale wind days 0
Damaging wind days 0

Relative Humidity
Minimum relative humidity 34% (16)
Maximum relative humidity 100% on 9 separate days

Number of days with cloud-to-cloud and cloud-to-ground lightning 1

Character of day: Clear 8 Partly cloudy 10 Cloudy 12
Sky cover (sunrise to sunset): 5.8
Minimum visibility: 1/4 mile in drizzle and fog (30)

Remarks: Welcomed rains towards the last few days of the month. No severe weather observed this month. Rainfall was 0.37″ below normal here in the city. Year to date rainfall only 0.06″ below normal through September 30. Mean average temperature was 4.3° above normal. The normal temperature was based on old Woodstock COOP station data now closed. The normal precipitation data value was based on COCORAHS model data from the Colorado Climate Center. Weather computer problems resulted in some missing data this month. Due to change in observing program, only convective and storm-related cloud types will be observed in future observations. Cloud types not severe will be used for local forecasting only. These will not appear on the daily surface weather observations.


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Stewartsville September 2016 Summary

Stewartsville Monthly Weather Observation Summary
Sep-16
DAY MAX MIN MEAN PRECIP COMMENTS
1 82 63 72.5 0.10
2 81 57 69.0 0.00
3 79 57 68.0 0.00
4 82 53 67.5 0.00
5 87 54 70.5 0.00
6 87 66 76.5 0.00
7 89 66 77.5 0.00
8 93 65 79.0 0.00
9 92 73 82.5 0.00
10 96 71 83.5 0.00
11 83 60 71.5 0.00
12 81 50 65.5 0.00
13 85 56 70.5 0.00
14 91 60 75.5 0.00
15 76 53 64.5 0.00
16 78 47 62.5 0.00
17 82 50 66.0 0.00
18 85 67 76.0 0.00
19 76 66 71.0 1.35
20 83 64 73.5 0.00
21 85 59 72.0 0.00
22 86 53 69.5 0.00
23 88 50 69.0 0.00
24 74 51 62.5 0.00
25 73 43 58.0 0.00
26 71 41 56.0 0.00
27 75 52 63.5 0.33
28 71 46 58.5 0.00
29 62 55 58.5 0.45
30 61 52 56.5 1.12
3.35
Extreme High 96.0 Date: 10-Sep
Extreme Low 41.0 Date: 26-Sep
Mean Max: 81.1
Mean Low: 56.7
Mean: 68.9
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REISTERSTOWN MARYLAND – SEPTEMBER 2016 – MONTHLY CLIMATOLOGICAL SUMMARY

SEPTEMBER 2016 CLIMATOLOGICAL SUMMARY
FOR DOWNTOWN REISTERSTOWN MARYLAND
by NJWO Observer Ray Muller

Average maximum temperature 80.8°
Average minimum temperature 63.8°
Average mean temperature 72.3°
High temperature 93° (9)
Low temperature 52° (25)
Max daily range in temperature 26° 90°-64° (14)
Min daily range in temperature 3° 64°-61° (30)
Min max temperature 61° (30)
Max min temperature 77° (9)
Max temperature of 90° or more 5
Min temperature of 70° or more 4

Monthly precipitation 3.93″
Year-to-date precipitation (through 7/31) 33.37″
Max rain rate in 30 minutes 0.26″ (29)
Max precipitation in 12 hours 0.96″ (29)
Max precipitation in 24 hours 2.12″ (29)
Number of precipitation days with .01″ or more 7
Number of precipitation days wth .10″ or more 5
Number of precipitation days with .50″ or more 2
Number of precipitation days with 1.00″or more 1
Number of precipitation days with 2.00″or more 1

Weather types
Fog 12
Dense Fog 2
Thunder 3
Haze 6

Pressure
Highest barometric pressure 30.30″ (16)
Lowest barometric pressure 29.86″ (1)

Winds

Fastest Mile and direction 22 MPH from 060° (29/0806) Peak Wind Gust 31 MPH from NE (29/0807) Gale wind days 0
Damaging wind days 0

Relative Humidity
Minimum relative humidity 34% (16)
Maximum relative humidity 100% on 9 separate days

Number of days with cloud-to-cloud and cloud-to-ground lightning 1

Character of day: Clear 8 Partly cloudy 10 Cloudy 12
Sky cover (sunrise to sunset): 5.8
Minimum visibility: 1/4 mile in drizzle and fog (30)

Remarks: Welcomed rains towards the last few days of the month. No severe weather observed this month. Rainfall was 0.37″ below normal here in the city. Year to date rainfall only 0.06″ below normal through September 30. Mean average temperature was 4.3° above normal. The normal temperature was based on old Woodstock COOP station data now closed. The normal precipitation data value was based on COCORAHS model data from the Colorado Climate Center. Weather computer problems resulted in some missing data this month. Due to change in observing program, only convective and storm-related cloud types will be observed in future observations. Cloud types not severe will be used for local forecasting only. These will not appear on the daily surface weather observations.


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August 2016 Gaithersburg 2 WNW Maryland weather summary and statistics for the NJWO blog

AUGUST 2016 – GAITHERSBURG 2 WNW MARYLAND
BRIEF SUMMARY STATISTICS FOR THE NJWO BLOG
by Kevin Shaw, Observer in charge

Average high temperature 87.8° (+ 2.9°)
Average low temperature 69.2° (+ 5.1°)
Mean temperature 78.5° (+ 4.0°)
Precipitation 2.97″ (- 0.70″)
Greatest daily amount (date) 1.51″ (17)
Year to date precipitation 31.23″ (+ 1.28″)
High temperature for the month (date) 97° (13,14)
Low temperature for the month (date) 60° (23)
Highest barometric pressure (date) 30.37″ (23)
Lowest barometric pressure (date) 29.76″ (6)
Peak wind gust (date/direction): 18 (14/WSW)
Heating degree days for the month: 0
Cooling degree days for the month: 419
Greatest diurnal range (date): 25.2° (7)
Least diurnal range (date) 11.3° (3)

Fog days: 0
Thunder: 4
Sunny/clear days: 10 Partly Cloudy days: 17 Cloudy days: 4

Days with measurable precipitation (=>.01″) = 6
Days with maximum temperatures of 90 or more = 9
Days with minimum temperatures of 70 or more = 15

AUGUST 2016 MONTHLY SUMMARY
GAITHERSBURG 2 WNW MARYLAND
by Kevin Shaw, observer in charge

Once again this month of August was warmer than normal, and
also drier than normal. There were several daily records set, mostly with maximum low temperatures with many very warm,
muggy overnights. I had the warmest August mean temperature
(78.5°) and the warmest average minimum temperature (69.2°)
ever. The maximum average temperature (87.8°) only came in as the sixth warmest ever. The 9 days with maximum temperatures of 90 or greater was actually just about normal. 6 days with measurable precipitation was predictably below the normal of about 9 days. The wettest day of the month of 1.51″ on the 17th failed to break a daily record, but the 1.31″ that fell on the 15th did break a daily record, the only such record in this dry month. An all-time record high dew point temperature of 82 was set on the 12th (records on this variable only go back through 2013 unfortunately). The highest temperature of the month of 97°
was reached on the 13th and 14th. Only the reading on the 13th went into the record book as a tied daily max temp value with the reading recorded back in 2002. Numerous daily record high
minimum temperatures were either set or tied, including 5 days in a row during our hottest temperatures of the month between the 10th and 14th, and also on the 6th, 17th and 26th.

The average maximum temperature for the month was 87.8°
(+2.9°), the average minimum temperature was 69.2° (+ 5.1°). The resultant mean average temperature for the month was
78.5° (+ 4.0°).

The month’s total precipitation amount of 2.97″ was 0.70″
below the normal August amount of 3.67″. My current year to date precipitation total of 31.23″ through August 31 is 1.28″ above the normal amount of 29.95″. All measurable amounts of precipitation fell between the 12th and 21st. Trace amounts also fell on the 8th and 9th. 6 days of measurable rain at my station was below the long-term normal amount of 8.9 days.

The month’s highest barometric pressure reading of 30.37″ on the 23rd occurred on the day with our lowest monthly minimum air (60°) and dew point (57°) temperatures of the month. The modest lowest pressure reading of the month of 29.76″ on the 6th occured during a bit of a cloudy period (but without rain) from the 5th to the 9th.

The distribution of 10 sunny, 17 partly cloudy and only 4 cloudy days fit in with the dry conditions found during most of the month, particularly at the beginning and end of the month. With plenty of muggy dew points around, there was plenty of fuel around for cloud formation; they just didn’t develop into many full overcasts at all.

There were 419 cooling degree days (CDD) and 0 heating degree days. I didn’t observe any fog in August, but with the dew points frequently as high as they were, I probably missed early morning fog occurrences when I was sleeping. There were essentially a normal amount (4) of thunderstorm days, all occurring during our wettest period of the month between the 14th and 17th. The peak wind gust during the month was a very modest 18 MPH out of the WSW on the 14th during evening light thunderstorm activity that mostly missed the station. It was a generally calm month as only 19 days recorded a PWG of 10 MPH or more. The dominant daily wind direction was 16 days with a W/SW/WSW component, followed by 11 days with an
easterly component and 4 days with a northerly component.

My maximum temperature frequencies included 9 days at or above 90°, 21 days between 80° and 89° (including 11 days with max temps of either 88° or 89°), and 1 day with 79°. On the minimum temperature frequency side of things, there were 16 days between 60° and 69° and 15 days with minimum temperatures of 70° or greater.

The diurnal range average was below normal (18.6° vs the normal of
20.8°). The max daily range of 25.2° occurred on the 7th at the end of the beginning of the month dry period (with a dew point of 58° recorded that day – 89°-64°). There were an additional 10 days with daily ranges at or above 20°, The lowest daily temperature range of 11.3° (80°-69°)
occurred on a non-descript partly cloudy August 3rd day. There were only a total of 6 days during August with daily temperature readings less than 15°.

Late July finished up relatively cool with a long 90°+ streak broken that continued into August 2016 with the first 9 days failing to reach 90° but then on August 10 we started a streak of 8 straight days of 90° or more, along with dew point temperatures well up into the 70s and even low 80s. This was probably the most oppressive period of August, if not the entire summer. Only the thunderstorms from the 14th-17th provided any sort of relief. The rest of the month finished moderately hot and muggy, but without needed rain. The tropics appear to be getting active finally as we head into September, and perhaps will be transporting needed moisture into our area in September. We shall see. Check back later to see how September works out. Please continue to watch the tropics closely for the next several weeks.


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