January weather forecast
Pennsylvania, USA

January in Pennsylvania is distinguished as the coldest month of the year, with the mercury frequently venturing below 0°F (-17.8°C). The average temperatures for this month hover from 19°F (-7.2°C) to 33°F (0.6°C). The state's geographical disparities, especially the mountainous regions, play a vital role in influencing its winter climate. For instance, areas near Lake Erie and the mountainous interiors witness considerably more snow, often accumulating over 100" (2540mm) throughout the winter season. In contrast, eastern valleys, being on the leeward side of the mountains, tend to be warmer and receive less precipitation.

When compared to December, January sees a noticeable drop in temperatures, solidifying its reputation as the harshest winter month. Furthermore, February follows suit, though with slightly milder temperatures and retaining its status as the snowiest month. January's cold is accompanied by frequent snowstorms and, at times, heavy snowfall. Locations like Smethport have recorded extreme lows, with the temperature plummeting to an astonishing -42°F (-41.1°C) on January 5, 1904, marking one of the most extreme climatic events in the state's history. Fog, coupled with overcast skies, is a common sight, limiting the appearance of sunshine and further emphasizing the wintry atmosphere that dominates Pennsylvania during this month.

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• Philadelphia - January »
  The months with the least rainfall in Philadelphia are January and February Rain falls for 7.3 days and accumulates 0.83" (21mm) of rain. Temperature records in Philadelphia, Pennsylvania, mark January as the coldest month, with highs averaging 37.4°F (3°C) and lows at 25.5°F (-3.6°C).
• Pittsburgh - January »
  In Pittsburgh, in January, during 14.4 snowfall days, 3.31" (84mm) of snow is typically accumulated. The month with the least sunshine in Pittsburgh is January, with an average of 2.8h of sunshine.
• Allentown - January »
  In Allentown during January, snow falls for 5 days and regularly aggregates up to 3.15" (80mm) of snow. In Allentown during January, snow falls for 5 days and regularly aggregates up to 3.15" (80mm) of snow.
• Erie - January »
  In Erie in January, it is raining for 4 days, with typically 0.43" (11mm) of accumulated precipitation. In Erie in January, during 4 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.
• Reading - January »
  In Reading, during January, the rain falls for 7.9 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Reading, during January, snow falls for 6.4 days and regularly aggregates up to 2.8" (71mm) of snow.
• Scranton - January »
  January and September are months with the least rain in Scranton when the rain falls for 5.2 days and typically aggregates up to 1.38" (35mm) of rain. The months with the least rainfall in Scranton are January and September Rain falls for 5.2 days and accumulates 1.38" (35mm) of rain.
• Bethlehem - January »
  In Bethlehem in January, during 7.8 snowfall days, 3.23" (82mm) of snow is typically accumulated. In Bethlehem, in January, during 7.8 snowfall days, 3.23" (82mm) of snow is typically accumulated.
• Lancaster - January »
  In Lancaster in January, it is raining for 8.6 days, with typically 1.97" (50mm) of accumulated precipitation. In Lancaster in January, it is raining for 8.6 days, with typically 1.97" (50mm) of accumulated precipitation.
• Harrisburg - January »
  The months with the least rainfall in Harrisburg are January and February Rain falls for 5.7 days and accumulates 0.71" (18mm) of rain. In Harrisburg in January, snow falls for 6.3 days, with typically accumulated 1.18" (30mm) of snow.
• Altoona - January »
  In Altoona in January, snow falls for 15.9 days, with typically accumulated 5.28" (134mm) of snow. In Altoona, Pennsylvania, during January, the rain falls for 10.4 days and regularly aggregates up to 1.81" (46mm) of precipitation.
• York - January »
  The month with the most snowfall in York is January, when snow falls for 6.8 days and typically aggregates up to 2.4" (61mm) of snow. In York in January, during 6.8 snowfall days, 2.4" (61mm) of snow is typically accumulated.
• State College - January »
  In State College, during January, snow falls for 15.3 days and regularly aggregates up to 6.57" (167mm) of snow. In State College, during January, the rain falls for 10.5 days and regularly aggregates up to 2.28" (58mm) of precipitation.