Philadelphia
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Philadelphia, PA

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The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
December is the official beginning of winter in Philadelphia. The weather is characterized by low temperature in the range of 30°F (-1.1°C) and 44.8°F (7.1°C). The nights get colder, with the temperature occasionally dropping below 25°F (-3.9°C).
The cold winter winds are present throughout December, and warm winter clothing is essential.
Most crowds clear out of the streets and only a few people can be found basking in the four hours of sunshine per day. With an average of two rainfall days in December, snowfall accumulates to 3.4" (86.4mm) as the month progresses. December records 3.6" (91.4mm) of rainfall fetched from approximately ten and a half days. For a day out, packing an umbrella is advised.
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  • The average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (40.3°F).

  • The average low temperature in December: 30.1°F

The month with the highest average low temperature is July (69.2°F).
The coldest month (with the lowest average low temperature) is January (25.6°F).

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  • The average humidity in December: 67.7%

The month with the highest relative humidity is September (71.6%).
The month with the lowest relative humidity is April (60.4%).

  • The average rainfall in December: 3.6"

The wettest month (with the highest rainfall) is July (4.4").
The driest month (with the lowest rainfall) is February (2.7").

  • The average rainfall days in December: 10.6 days

The month with the highest number of rainy days is April (11.3 days).
The month with the lowest number of rainy days is August (8.4 days).

  • The average snowfall in December: 3.4"

The month with the highest snowfall is February (8.8").
Months with the lowest snowfall are May, June, July, August, September and October (0").

  • The average snowfall days in December: 1.8 days

The month with the highest number of snowfall days is January (4.4 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • The average daylight in December: 9h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in December: 4.4h

The month with most sunshine is June (Average sunshine: 9h).
The month with least sunshine is December (Average sunshine: 4.4h).

  • The average UV index in December: 2

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).

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