JUNE 2016 – GAITHERSBURG 2 WNW MARYLAND – Report for the NJWO Blog

by Kevin Shaw, Observer in charge

Average high temperature 83.4° (+ 0.5°)
Average low temperature 63.2° (+ 2.1°)
Mean temperature 73.3° (+ 1.3°)
Precipitation 3.96″ (- 0.44″)
Greatest daily amount (date) 1.24 (21)
Year to date precipitation 22.38″ (- 0.16″)
High temperature for the month (date) 94° (11)
Low temperature for the month (date) 50° (9)
Highest barometric pressure (date) 30.39″ (19)
Lowest barometric pressure (date) 29.54″ (7)
Peak wind gust (date/direction): 22 (8/SW)
Heating degree days for the month 2
Cooling degree days for the month: 252
Greatest diurnal range (date): 33.6° (11)
Least diurnal range (date ): 11.0° (3)

Fog days: 3
Thunder: 4
Sunny/clear days: 16
Partly Cloudy days: 8
Cloudy days: 6

Days with measurable precipitation (=>.01″) = 9
Days with maximum temperatures of 90° or more = 2
Days with maximum temperatures of less than 60° = 5

by Kevin Shaw, observer in charge

June 2016 had slightly above normal temperatures, particularly on the minimum side as has been the case the past few years, and slightly below normal precipitation. Extremes of daily precipitation and temperatures were limited to just a few days. The wettest day of the month, 1.24″ on the 21st set a daily record, and a more modest amount of 0.72″ on the 16th also set a daily record. The total precipitation amount of 3.96″ was my 19th wettest/driest June ever in 38 years of record going back to 1979. Nine days of measurable rainfall came in a bit below my long-term normal amount of 11.4. The 71° maximum temperature on the 8th tied a record for the date with 2003 for lowest max temperature. A pair of 69° minimum temperatures on the 3rd and 4th tied a record on the 3rd with 2010 for highest min and set a new daily record on the 4th. The extreme values for the month came close, but did not eclipse or tie the daily records for the dates. (94° high on the 11th which followed the 50° low just two days before on the 9th). 2 days with max temps of 90° or more and 5 days with min temps in the 50s are pretty typical for the month of June. At least no long heat waves!!!

The average maximum temperature for the month was 83.4°
(+0.5°), the average minimum temperature was 63.2° (+ 2.1°). The resultant mean average temperature for the month was
73.3° (+ 1.3°).

The month’s total precipitation amount of 3.96″ was 0.44″
below the normal June amount of 4.40″. My current year to
date precipitation total of 22.38″ through June 30 is 0.16″
below the normal amount of 22.54″. Precipitation was fairly
well distributed throughout the month, with the longest dry
spell of 6 days between the 9th and 14th the longest period. The 9 days of measurable precipitation for the month was half the amount we had in May, but only about 2 1/2 days below the long-term average of 11.4.

The month’s highest barometric pressure reading of 30.39″ on the 19th occurred in the middle of our 2nd mini-heat wave of the month. The lowest pressure reading of the month was 29.54″ on the 7th at the beginning of our coolest period of the month on the 8th and 9th.

The distribution of 16 sunny, 8 partly cloudy and 6 cloudy days fit in the drier, sunnier June 2016 pattern. 10 of the 16 sunny days during the month occurred during the middle part of the month, between the 8th and 20th.

There were 252 heating degree days (HDD) and 2 cooling degree days. There were a below normal amount of 3 days with fog and a just about normal amount (4) of thunderstorm days. The peak wind gust during the month was a modest 22 MPH out of the SW on the 8th, once again behind the strongest traditional cold frontal passage of the month, and our resultant coolest period of the month through the 9th. It was not a very windy month, with only 2 days registering peak wind gusts over 20 MPH.
The dominant daily wind direction was 16 days with a SW
component, and then 13 days with an E component.

My maximum temperature frequencies included 2 days of 90°,
25 days between 80° and 89°, and 3 days between 70° and 79°. On the minimum temperature frequency side of things, there
were 5 days with minimums between 50° and 59°, 24 days
between 60° and 69° and 1 day with a minimum greater than 70°.

The diurnal range average was only a little bit below normal (20.2° vs the normal of 21.8°). The max daily range of 33.6° occurred on the 11th on our hottest day of the month (94°- 60°). There were an additional 11 days with daily ranges at or above 20°, same as in May. The lowest daily temperature range of
only 11.0° (80°-69°) occurred on the 3rd on our second
day of the month (1.04″). There were only 4 additional days
during June with daily temperature ranges of less than 15°.

June 2016 was yet another reversal to the wet, cloudy patterns
of May, with warmer, drier skies on the whole compared with the previous month. Strong indications currently are a prevalent theme among many forecasters that we are going to have a hot
rest of the summer. We shall see. So far July has started out relatively cool, cloudy and wet, but forecasts for the coming week include those all too familiar summertime descriptive
terms of hot and humid. Check back in a few weeks to see how July finishes out. Don’t forget we are now in Hurricane Season! We haven’t had much tropical activity yet or in the past few years here in this area of Maryland but it could start anytime!

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