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Through tonight: The mostly clear sky persisted and the wind subsided. With a cold air mass in place, it’s a good recipe to see temperatures drop easily at night. Lows range from the mid-30s to well below 40 at most points. Some locations to the north and west, such as Purcellville and Frederick, could see temperatures hitting freezing.

The western suburbs are in the immediate vicinity of the last glaciation by recent averages. Dulles has an average last freeze on April 20. In Baltimore, it’s April 9. May freezes are not uncommon. Dulles last saw one on May 14, 2013, when it hit 32 points.

See Current weather at The Washington Post.

Tomorrow (Tuesday): Morning sunshine may give way to a few midday clouds. However, perhaps not worse than partly cloudy. The temperature rose again to nearly 60 degrees. Winds blow from the northwest about 5 to 10 mph.

See Jason Samenow’s forecast for the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter And Instagram. For related traffic news, see Gridlock.

Update pollen: Pollen on trees is HIGH at 442.17 particles per cubic meter, but down from last week due to rain. Low/medium mold spores. Other allergens are low.

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