Rocky Mountain National Park weather in December
December in Rocky Mountain National Park: freezing, a little rain, with clean air — a fair time to visit.
#10 of 12 months in Rocky Mountain National Park · #472 of 604 destinations to visit in December · comfort 52/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Rocky Mountain National Park climate normals — December
| Daytime high | -1°C / 29°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -12°C / 10°F | |
| Feels like (high) | -6°C / 21°F | |
| Rainfall | 43 mm / 1.7 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 71% | 💧 humid |
| Dew point | -13°C / 9°F | |
| Sunshine | 7.3 h/day | |
| Daylight | 9.4 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 48.6 cm / 19.1 in | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rocky Mountain National Park in December — FAQ
- Is December a good time to visit Rocky Mountain National Park?
- December in Rocky Mountain National Park: freezing, a little rain, with clean air — a fair time to visit. It ranks #10 of 12 months for Rocky Mountain National Park on SeasonMap's comfort score (52/100).
- What is the weather like in Rocky Mountain National Park in December?
- In December, Rocky Mountain National Park averages a daily high of -1.5°C and a low of -12.3°C, with about 42.8 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Rocky Mountain National Park in December?
- Rocky Mountain National Park has a mean US Air Quality Index of about 44 in December.
- Does it snow in Rocky Mountain National Park in December?
- Rocky Mountain National Park sees roughly 48.6 cm of snowfall in December.