Pittsburgh, Pennsylvania weather in December

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

Average high: 43°F
Average low: 30°F
Rainy days: ~11 per month
Total precipitation: 3.3 in
Warmest recorded: 65°F
Coldest recorded: -3°F

Expect December days in Pittsburgh, Pennsylvania to top out around 43°F and cool to about 30°F overnight, with roughly 11 days of measurable rain across the month. In recent years December has ranged from -3°F to 65°F.

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