Mid-summer progress report: D.C. weather is just dandy, if a tad toasty


Flag over D.C. rooftops, June 30, 2014 (Clif Burns via Flickr)

We’re a little past the half way point in meteorological summer – which spans June through August. Thus far, the summer has averaged somewhat warmer and somewhat wetter than average but we’ve avoided heat extremes. The hottest and wettest weather has all occurred on weekdays. The weekend weather – dating back all the way to April – has been spectacular, as we’ve written about repeatedly.

Our local National Weather Service forecast office in Sterling, Va. crunched the numbers this morning and found the summer average temperature at Reagan National ranks 9th warmest in the last 30 years through Monday. June was two degrees warmer than average, and July – so far – is running half a degree warmer than average.

Nighttime low temperatures have departed from average more than daytime highs. The average low has been 70 ranking 6th warmest over the last 30 years.

Five of the top six warmest low temperature averages over the past 30 years have occurred from 2010 to 2014, according to the National Weather Service.
Rankings: (1) 2010, 72.1 (2) 2013, 71.6 (3) 2011 71.0 (4) 1994 70.9 (5) 2012 70.2 (6) 2014 70.0


High temperatures have been near average relative to the last 30 years, ranking 12th – at 87 degrees. We’ve logged 14 days at or above 90 degrees, compared to an average of around 18. For the heat haters, we’ve avoided triple digit days

In terms of rain, summer totals are running somewhat above average. June was slightly drier than average at Reagan National, which picked up 3.31″ vs. a normal of 3.78″ (Dulles and BWI airports had slight rainfall surpluses). July has been on the wet side, with 4.57″ of rain so far, 2″ above normal.

For those keeping track, our summer outlook is performing well, as far as temperatures go. We called for June to be 1-2 degrees above average (actual was 2 degrees above average) and for July to be one degree above average (actual is 0.5 degree average with 9 days remaining). As we called for near average precipitation, we’ve underestimated the amount of rain so far (1.5 inches above normal) – but there is still August to come.

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
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Jason Samenow · July 22, 2014