PA December Forecast: Cold, And Snow Possible Mid-Week, NWS Says

Welcome to December.

It's going to be cold.

That's according to the National Weather Service, which has released an updated 30-day forecast for the month. A "major" pattern change will result in some cold weather for the weeks to come, the National Weather Service says. The longwave pattern change is likely to occur during the first week of December, the NWS estimates.

"Following a mild start to December, this major pattern change is likely to usher in an outbreak of below to much-below-normal temperatures at least through mid-December," according to the 30-day outlook, which was released Thursday.

Also, NWS forecasters predict a chance of snow showers mid-week. (More on that below.)

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Both the European and U.S. computer models are in agreement that the pattern shift "strongly favors" below-normal temperatures across the Eastern United States, the NWS says.

"A cold front, associated with the onset of the major pattern change is expected to result in precipitation amounts of 0.5 to 2 inches across the Eastern United States during the first week of December," the monthly outlook says.

Here is the forecast:

Today: Sunny, with a high near 54. Northwest wind 8 to 10 mph.

Tonight: Mostly clear, with a low around 32. North wind around 6 mph becoming calm after midnight.

Saturday: Mostly sunny, with a high near 50. Calm wind.

Saturday Night: Partly cloudy, with a low around 33. Calm wind.

Sunday: Sunny, with a high near 51. Light north wind becoming northwest 5 to 10 mph in the morning.

Sunday Night: Mostly clear, with a low around 33.

Monday: Mostly sunny, with a high near 53.

Monday Night: Mostly cloudy, with a low around 40.

Tuesday: A chance of showers. Cloudy, with a high near 60. Chance of precipitation is 40%.

Tuesday Night: Showers likely. Cloudy, with a low around 45. Chance of precipitation is 60%.

Wednesday: Showers likely. Mostly cloudy, with a high near 54. Chance of precipitation is 60%.

Wednesday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 32. Chance of precipitation is 40%.

Thursday: A chance of rain and snow showers. Partly sunny, with a high near 43. Chance of precipitation is 30%.