Denver, Colorado weather in December

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

Average high: 48°F
Average low: 24°F
Rainy days: ~4 per month
Total precipitation: 0.7 in
Warmest recorded: 73°F
Coldest recorded: -16°F

Expect December days in Denver, Colorado to top out around 48°F and cool to about 24°F overnight, with roughly 4 days of measurable rain across the month. In recent years December has ranged from -16°F to 73°F.

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Current Denver, Colorado forecast → · Historical data by Open-Meteo (ERA5).