Last updated: March 2, 2024
The weather in Philadelphia, United States, during January is characterized by an average temperature of -6°C (22°F). Highs can soar to 9°C (49°F), while lows may dip to -27°C (-16°F). Typically, the humidity level in Philadelphia throughout January hovers around 93%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In January, Philadelphia averages 86 mm (3.4 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 9 hours 17 minutes of daylight, with the sun shining for approximately 3 hours 26 minutes each day. Additionally, there is a 24% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In January, the UV Index in Philadelphia reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 10:00 and 12:00, during which unprotected skin may burn in as little as 45 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | ||||||||||||
| Time to burn | 45 min | ||||||||||||