Philadelphia
Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast
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January 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
January is quite cold in Philadelphia with the mercury holding in the range of 25.5°F (-3.6°C) and 40.3°F (4.6°C). The nights are quite chilly because of the cold winter winds blowing throughout.
The days are much more tolerable receiving up to five hours of sunshine and moderately low humidity of 66.2%. Snowfall is a regular occurrence in January, with approximately four and a half days of snowfall and a mildly high accumulation of 6.5" (165.1mm). In January, rainfall is experienced for an average of ten and a half days, and the rain gauge collects 3" (76.2mm) in precipitation.
Expect minimal outdoor activities due to the cold - dressing warmly while outdoors is essential.
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  • The average high temperature in January: 40.3°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 January: 25.6°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 January: 66.2%

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 January: 3"

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 January: 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 January: 6.5"

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 January: 4.4 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 sea temperature in January: 41.8°F

The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

  • The average daylight in January: 10h

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 January: 5h

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 January: 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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