Mount Rainier National Park weather in December
December in Mount Rainier National Park: freezing, soaked, with clean air — one of the weakest months to visit.
#12 of 12 months in Mount Rainier National Park · #579 of 604 destinations to visit in December · comfort 29/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Mount Rainier National Park climate normals — December
| Daytime high | -6°C / 22°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -11°C / 12°F | |
| Feels like (high) | -10°C / 14°F | |
| Rainfall | 260 mm / 10.2 in | ⛈ soaked |
| Rainy days | 21 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | -10°C / 13°F | |
| Sunshine | 3.5 h/day | |
| Daylight | 8.6 h | |
| Wind | 12 km/h / 7 mph | |
| Snowfall | 142.9 cm / 56.3 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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Mount Rainier National Park in December — FAQ
- Is December a good time to visit Mount Rainier National Park?
- December in Mount Rainier National Park: freezing, soaked, with clean air — one of the weakest months to visit. It ranks #12 of 12 months for Mount Rainier National Park on SeasonMap's comfort score (29/100).
- What is the weather like in Mount Rainier National Park in December?
- In December, Mount Rainier National Park averages a daily high of -5.6°C and a low of -11°C, with about 259.5 mm of rain over roughly 20.6 rainy days.
- What is the air quality in Mount Rainier National Park in December?
- Mount Rainier National Park has a mean US Air Quality Index of about 36 in December.
- Does it snow in Mount Rainier National Park in December?
- Mount Rainier National Park sees roughly 142.9 cm of snowfall in December.