Pennsylvania is bracing for a complex and potentially hazardous stretch of winter weather from December 18 to 24, with NOAA’s long-range forecast predicting a strong setup for snow, freezing rain, and mixed precipitation across the state. With temperatures near to slightly above normal in southern counties and colder conditions to the north, Christmas travel may be sluggish and slick across the state.
According to NOAA, northern Pennsylvania—including Erie, Bradford, Scranton, and the northern tier—is closest to the below-normal temperature band, resulting in more frequent snow episodes and a higher chance of accumulating precipitation throughout the week. Lake-effect impacts may potentially lead to a little snowfall around Erie and the I-90 corridor.
Central Pennsylvania, including State College, Williamsport, Altoona, and Harrisburg, is in the zone with the highest freezing-rain potential. This location is located at the intersection of marginal surface temperatures and warm-air intrusion aloft, creating a favorable environment for recurring ice, particularly from December 19 to 21. A light glaze, sleet, or rain-snow mix may create hazardous early morning travel conditions.
Southern Pennsylvania—including Pittsburgh, York, Lancaster, and Philadelphia—has above-average temperatures, which increases the risk of chilly rain during early storms. However, colder air moving in from the northwest by December 22-24 increases the likelihood of rain turning to wet snow, particularly on higher terrain between Pittsburgh and the Laurel Highlands.
Major roadways, including I-76 (Turnpike), I-80, I-81, I-83, I-79, and U.S. 322, may face slippery conditions, ice patches, and limited visibility, especially between December 21 and Christmas Eve, when impacts are most severe.
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