December weather forecast
Pennsylvania, USA

December ushers in the full force of winter in Pennsylvania, with the landscape often blanketed in snow and temperatures dipping to reinforce the season's chilly grip. Temperatures predominantly range from 19°F (-7.2°C) to 40°F (4.4°C), but as the month advances, even colder conditions prevail, particularly during nighttime.

Snowfall becomes a more common occurrence, with the state's mountainous regions and areas near Lake Erie receiving a significant portion. The snow can range from light flurries to heavier snowstorms, creating picturesque winter scenes reminiscent of holiday postcards. This snow, combined with the festive atmosphere of the holiday season, makes Pennsylvania a winter wonderland for many.

Rainfall becomes less frequent, but when it does occur, it often takes the form of sleet or freezing rain, particularly in regions where temperatures hover around the freezing point. These conditions can make roads and sidewalks slippery, emphasizing the need for caution.

Areas in proximity to Lake Erie continue to experience the lake's moderating effects early in the month, but as December advances, even these regions brace for substantial snowfall, especially with the onset of the lake-effect snow phenomena.

Contrasting with November, December is undeniably colder and snowier. While November provides glimpses of the forthcoming winter, December immerses Pennsylvania fully into the season. The days are at their shortest, nights at their longest, and the state often finds itself beneath clear starry skies or within the gentle embrace of snowfall. The atmosphere in December is one of festivity, reflection, and anticipation, as Pennsylvania both celebrates the end of a year and awaits the promise of a new one.

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• Philadelphia - December »
  In Philadelphia in December, it is raining for 7.5 days, with typically 1.18" (30mm) of accumulated precipitation. The months with the lowest UV index in Philadelphia are January, February, November and December, with an average maximum UV index of 2.
• Pittsburgh - December »
  In Pittsburgh during December, the rain falls for 10.5 days and regularly aggregates up to 2.13" (54mm) of precipitation. In Pittsburgh, in December, snow falls for 10.3 days, with typically accumulated 2.01" (51mm) of snow.
• Allentown - December »
  In Allentown, in December, during 2.5 snowfall days, 2.28" (58mm) of snow is typically accumulated. In Allentown, in December, during 2.5 snowfall days, 2.28" (58mm) of snow is typically accumulated.
• Erie - December »
  In Erie in December, snow falls for 6.6 days, with typically accumulated 0.31" (8mm) of snow. In Erie in December, during 6.6 snowfall days, 0.31" (8mm) of snow is typically accumulated.
• Reading - December »
  In Reading in December, during 3.7 snowfall days, 1.5" (38mm) of snow is typically accumulated. In Reading during December, snow falls for 3.7 days and regularly aggregates up to 1.5" (38mm) of snow.
• Scranton - December »
  In Scranton during December, snow falls for 8.4 days and regularly aggregates up to 4.21" (107mm) of snow. In Scranton, Pennsylvania, in December, snow falls for 8.4 days, with typically accumulated 4.21" (107mm) of snow.
• Bethlehem - December »
  In Bethlehem, in December, snow falls for 4.8 days, with typically accumulated 2.48" (63mm) of snow. In Bethlehem in December, it is raining for 10.7 days, with typically 2.24" (57mm) of accumulated precipitation.
• Lancaster - December »
  In Lancaster during December, the rain falls for 10.7 days and regularly aggregates up to 2.09" (53mm) of precipitation. The months with the lowest UV index in Lancaster are January, February, November and December, with an average maximum UV index of 2.
• Harrisburg - December »
  The month with the shortest days is December, with an average of 9h and 24min of daylight. The months with the lowest UV index in Harrisburg, Pennsylvania, are January through March, November and December, with an average maximum UV index of 2.
• Altoona - December »
  In Altoona, Pennsylvania, in December, during 11.1 snowfall days, 3.5" (89mm) of snow is typically accumulated. In Altoona in December, during 12.3 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.
• York - December »
  In York in December, snow falls for 3.5 days, with typically accumulated 0.98" (25mm) of snow. In York in December, during 9.4 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.
• State College - December »
  In State College in December, snow falls for 11.5 days, with typically accumulated 4.45" (113mm) of snow. In State College, Pennsylvania, during December, the rain falls for 12.6 days and regularly aggregates up to 2.52" (64mm) of precipitation.