December is coming to a warm and damp conclusion. This month will finish as D.C.'s second warmest on record and will be the 10th warmer than average December in the last 11 years. It will also rank among D.C.'s driest December's with 0.60" as of December 30.
2021 will finish as a warmer and wetter than average year, despite it's drier than average final quarter. With 44.06" of rain as of December 30, Washington, D.C.'s rainfall surplus for the year is 2.33". That's significantly less than the 57.34" that occurred last year. However, it's much closer to D.C.'s annual rainfall average of 41.82”.
Rainfall has been feast or famine this year with very wet months like June (5.51") and August (9.07"). They finished a combined 7.13" wetter than average. There also were some very dry months like November and December that will each finish among the Top 10 driest on record. Following the 2019-2020 winter season that saw almost no measurable snowfall, Washingtonians saw a combined total of 5.4" of snow in January and February. While more than the previous winter, 5.4" is still less than half of D.C.'s annual snowfall average of 13.7", according to NOAA.
Seven months this year featured above average temperatures in Washington, D.C., while only four were cooler than average. February and November were each at least 2.0° colder than average. October and December will each finish more than 5.0° warmer than average and are the second warmest such months on record in the Nation's Capital.
Aside from the temperature and rainfall extremes of 2021, there have been other prominent D.C. area weather events in 2021. Most importantly was the heavy rain, flooding and severe weather in early September related to the remnants of Hurricane Ida, including the EF-2 tornado near Annapolis, Maryland. Also, August 2021 had 9.07" of rain that made it D.C.'s wettest since 1967 (9.17").
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