Weather in Philadelphia in January
January in Philadelphia is cold with average temperatures around -0.8°C (30.6°F). Moderate rainfall of 78mm spread over 9 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
3.4°C
38.1°F
Low
-5.1°C
22.8°F
Precipitation
78 mm
3.1 inches
~9 rainy days
Conditions
Humidity
84%
Comparison to Adjacent Months
January is 3.1°C cooler than December, 33mm drier than December.