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.
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.