Philadelphia, Pennsylvania weather in December

Averages from 2021–2025 (155 days of record).

Average high: 46°F
Average low: 32°F
Rainy days: ~10 per month
Total precipitation: 3.9 in
Warmest recorded: 67°F
Coldest recorded: 6°F

Expect December days in Philadelphia, Pennsylvania to top out around 46°F and cool to about 32°F overnight, with roughly 10 days of measurable rain across the month. In recent years December has ranged from 6°F to 67°F.

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Current Philadelphia, Pennsylvania forecast → · Historical data by Open-Meteo (ERA5).