The highest day temperature in December 2025 was 52°F. The lowest night temperature was 12°F. The average values for day and night temperatures during December were 37.1°F и 28.2°F respectivly.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Philadelphia is 2.4 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 7.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Philadelphia in December is 4.8 hours.