From the ABC 7 Weather team

Archive for category Seasonal May 2015

May much warmer than average, hot week ahead

May 25, 2015 - 04:21 PM
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May has been an exceptionally warm month in the D.C. area, with 18 of the 24 days so far experiencing above average temperatures. There have been three 90 degree days and 15 days with high temperatures above 80 degrees. Our averages for May 25th (Memorial Day Monday) are 78 for the high and 59 for the low, so chalk up another day with highs 5 to 10 degrees above average.

Latest 7-Day Outlook here

Here are the five warmest months on record in D.C.:

1991 - 73.0F

2004 - 71.8F

1944 - 71.6F

2012 - 71.4F

1880 - 70.5F

Thus far, May 2015 is averaging 71.1F putting the month solidly as the 5th warmest. Temperatures this week are expected to consistently be in the upper 80s, which is right around 10 degrees above average. This could easily put the month as the 3rd or 4th warmest on record, but the 73F recorded in 1991 appears safe. Regardless, this will be only the 7th time since 1871 May has experienced an average temperature above 70 degrees.

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First 90 degree day of the year possible Tuesday

May 11, 2015 - 01:51 PM
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The month of May is currently running nearly 8 degrees above average so far but some relief is in sight by the middle and end of the work week. Temperatures again topped the 80 degree mark today and may possibly reach 90 degrees Tuesday. The average high at Reagan National for this time of year is in the mid 70s. Here's a look at the first 90 degree days over the past five years in Washington D.C.

First 90F Day in D.C. over the past 5 years

You can see just last year, the first occurrence was May 13 when it reached 92F. Last year only had 24 days at or above 90 degrees, which is below the average of 36 days. While it still hasn't reached 90 degrees yet this year, this doesn't mean it will be a cooler summer. 2011 and 2012 featured the first 90 degree day late in the month of May and still experienced 50 and 53 days respectively at or above 90F.

Forecast temperatures Tuesday at 3pm per the 4km NAM Model (Courtesy: WeatherBell Models)

Tuesday our forecast is currently to reach 89 degrees, but with a frontal boundary moving through we may get some additional compressional heating with strong westerly winds helping push parts of the area over 90 degrees. If the region doesn't reach 90 degrees tomorrow, we'll have to wait at least another week or two for the next opportunity. At this point it appears the 18th and 19th might be rather warm ahead of a cold front.

Wednesday through Friday should be much more comfortable with temperatures in the 70s and dewpoints back in the 50s and 40s.

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