Boulder weather in December
December in Boulder: cold, dry, with clean air — a good time to visit.
#10 of 12 months in Boulder · #627 of 897 destinations to visit in December · comfort 60/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Boulder in December
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Boulder climate normals — December
| Daytime high | 6°C / 43°F | 🧥 cold |
|---|---|---|
| Nighttime low | -7°C / 19°F | |
| Rainfall | 25 mm / 1 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 66% | 💧 humid |
| Dew point | -9°C / 16°F | |
| Sunshine | 7.5 h/day | |
| Daylight | 9.4 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 16 cm / 6.3 in | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boulder in December — FAQ
- Is December a good time to visit Boulder?
- December in Boulder: cold, dry, with clean air — a good time to visit. It ranks #10 of 12 months for Boulder on SeasonMap's comfort score (60/100).
- What is the weather like in Boulder in December?
- In December, Boulder averages a daily high of 6.3°C and a low of -7.2°C, with about 25.1 mm of rain over roughly 5.2 rainy days.
- What is the air quality in Boulder in December?
- Boulder has a mean US Air Quality Index of about 36 in December.
- Does it snow in Boulder in December?
- Boulder sees roughly 16 cm of snowfall in December.