* Frost advisory Montgomery, Loudoun & Howard co. late tonight *
* Freeze warning Frederick & Carroll co. and north & west *

What do you know? Five of the last 6 days (including today) have actually been cooler than normal. 44 of the 51 days before that had been at or above normal. We stay on the cool side through the weekend. The good news is that, after previous concerns about a lot of rain, the balance of the daylight hours Saturday and Sunday should be dry, though a showery stretch threatens intermittently late Saturday afternoon through Sunday morning.

Through Tonight: Clear to partly cloudy and cold. Lows range from the low-to-mid 30s in the colder suburbs (upper Montgomery, Loudoun and Frederick counties) to the low 40s downtown. A wind from the north at 10-15 mph gradually diminishes to around 5 mph towards morning.

Saturday: A mix of sun and clouds for the first half of the day followed by increasing clouds in the afternoon. There’s a 20-40% chance of showers in the afternoon, with the highest chances north of town. It’s chilly with highs 56-65 (north-south). Light winds become from the south in the afternoon at around 5-10 mph.

Saturday night: Cloudy with a 40-50% chance of showers and thunderstorms. Lows range from 42-47 (suburbs-city).

Sunday: A 30-40% chance of morning showers, followed by partly sunny skies in the afternoon. Highs range from the low-to-mid 60s.

See Camden Walker’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter. For related traffic news, check out Dr. Gridlock.

Pollen: Trees are HIGH at 165 grains/cubic meter (compared to 187 Thurs.). Other pollens/mold are LOW.

Science/Night Sky events this weekend: Two great events for science enthusiasts this weekend. 1) The U.S. Science and Engineering Festival – which includes several weather exhibits – is at the D.C. Convention Center Saturday and Sunday. 2) Saturday night is Astronomy Night on the National Mall. It’s being called the “Largest Astronomy Event in the History of the National Mall”. Should it rain or be mostly cloudy (a pretty high likelihood), it will be held Sunday night.