Weather in Philadelphia in December
December in Philadelphia is cold with average temperatures around 2.3°C (36.1°F). Expect significant rainfall with 111mm across approximately 10 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
6.6°C
43.9°F
Low
-2.0°C
28.4°F
Precipitation
111 mm
4.4 inches
~10 rainy days
Conditions
Humidity
85%
Comparison to Adjacent Months
December is 5.2°C cooler than November, 21mm wetter than November.
December is 3.1°C warmer than January, 33mm wetter than January.