C&O Canal on Sunday after the area’s first snow. (George Jiang via Flickr)

TODAY’S DAILY DIGIT
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.

6/10: A seasonably cold December day with plenty of sunshine. Nothing special, but not much to complain about either.

EXPRESS FORECAST

Today: Mostly sunny. Highs: 40 to 45.
Tonight: Increasing clouds, spotty light wintry mix possible late. Lows: 29 to 35.
Tomorrow: Variably cloudy, windy, flurries possible. Highs: 40 to 45.

View the current weather conditions at The Washington Post headquarters.

FORECAST IN DETAIL

This week will be the coldest of the season so far and will also feature its coldest day, Wednesday. Meanwhile, a few weak, fast-moving clippers could bring some flurries and snow showers but rather limited accumulation prospects. Thursday morning may bring the best chance for snow. By Sunday, a slow thaw may begin.

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Today (Monday): We start the week on a quiet and chilly note despite plenty of sunshine. Early-morning temperatures in the 20s should crest to 40 in most spots during the afternoon. Light winds. Confidence: High

Tonight: A clipper approaches from the west, increasing clouds late at night. Some spotty mixed precipitation (sleet and snow) is possible (30 percent chance) toward morning — mainly in our northern areas. Little or no accumulation is expected with lows in the upper 20s in our cold spots to the mid-30s downtown. Winds start to pick up toward morning. Confidence: Medium

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Tomorrow (Tuesday): The clipper drags a strong cold front through the region during the day, and winds crank up, gusting from the northwest up to 30 mph during the afternoon. Temperatures rise to 40 to 45 before the core of the cold spills in to the region toward evening when a few flurries could fly. Otherwise, most of the day is variably cloudy and dry. Confidence: Medium

Tomorrow night: Partly cloudy, blustery and very cold. Lows plunge into the upper teens and lows 20s by morning, with windchills in the single digits and teens. This is the coldest air of the season to date. We can’t rule out a brief snow shower or flurry with the frigid air blasting into the area. Confidence: Medium-High

A LOOK AHEAD

Temperatures hover in the 20s for much of Wednesday, maybe climbing to 30 to 34 degrees in our typically milder areas around the city. But it will feel like the teens and 20s all day, factoring in the wind, despite sunshine. Confidence: Medium

Some light snow is possible late Wednesday night and Thursday morning as the next clipper zips by. With temperatures in the 20s, any snow will stick and so we cannot rule out some light accumulation so long as the clipper doesn’t miss to our north. It should move through fast, with clearing skies in the afternoon. It’s cold Thursday, with highs in the low to mid-30s. Mostly clear Thursday night, with lows in the upper teens in our colder areas and the 20s elsewhere. Confidence: Medium

Yet another fast-moving disturbance moves into the region Friday offering another chance of light snow, most likely in the afternoon. Highs are in the 30s. Gradual clearing at night with lows in the 20s. Confidence: Low-Medium

The weekend weather will gradually turn not quite as cold. On Saturday, sunshine should help highs make a run toward 40 degrees while Sunday could come close to 50. But on Sunday, the latest in the line of weather systems could approach and produce a few rain showers (low confidence). Confidence: Low-Medium

SNOW POTENTIAL INDEX
A daily assessment of the potential for at least one inch of snow in the next week, on a 0-10 scale.

1/10 (→): Although flurries are possible at other times, the week’s best chance for snow is Thursday morning, but should be light and is far from certain.