After a glorious spring weekend with summer-like temperatures, Reston is about to get a reality check Tuesday.

The forecast is calling for a 40-degree temperature drop, as well as just maybe a few flakes of snow.

From The Washington Post’s Capital Weather Gang:

Between late afternoon Monday and Tuesday, we’ll go from temperatures near 80 to the 40s.  Tuesday afternoon’s cold rain could even transition to mixed precipitation before ending  at night.  Many parts of the area see temperatures drop below freezing early Wednesday morning and some then struggle to escape the 40s Wednesday afternoon.

…Temperatures continue to fall through the 40s during Tuesday evening, into the 30s by around dark in some of our colder suburbs and closer to 10 or 11 p.m. inside the Beltway.  This may allow rain — if it lingers long enough — to mix with and change to sleet and/or snow before ending (20-30 percent chance, highest western areas).  As usual, the best chance of any wintry precipitation is in our colder suburbs to the northwest.  Little or no accumulation is expected and it’s completely possible the rain shuts off before it’s cold enough for frozen precipitation.

To review: April 15. Wintry Mix.

Fun fact: The National Weather service says the latest measurable snow recorded in D.C. was April 28, 1998 (0.5 inch). At Dulles, the latest measurable snow was April 12, 1973, when an inch was recorded.