Philadelphia weather in December
December in Philadelphia: cold, rainy, with clean air — a good time to visit.
#10 of 12 months in Philadelphia · #414 of 604 destinations to visit in December · comfort 60/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Philadelphia climate normals — December
| Daytime high | 8°C / 47°F | 🧥 cold |
|---|---|---|
| Nighttime low | 1°C / 34°F | |
| Feels like (high) | 5°C / 41°F | |
| Rainfall | 119 mm / 4.7 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 72% | 💧 humid |
| Dew point | -1°C / 30°F | |
| Sunshine | 5.4 h/day | |
| Daylight | 9.4 h | |
| Wind | 17 km/h / 11 mph | |
| Snowfall | 4.3 cm / 1.7 in | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Philadelphia in December — FAQ
- Is December a good time to visit Philadelphia?
- December in Philadelphia: cold, rainy, with clean air — a good time to visit. It ranks #10 of 12 months for Philadelphia on SeasonMap's comfort score (60/100).
- What is the weather like in Philadelphia in December?
- In December, Philadelphia averages a daily high of 8.3°C and a low of 1°C, with about 119.2 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Philadelphia in December?
- Philadelphia has a mean US Air Quality Index of about 49 in December.
- Does it snow in Philadelphia in December?
- Philadelphia sees roughly 4.3 cm of snowfall in December.