Mammoth Lakes weather in December
December in Mammoth Lakes: cold, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Mammoth Lakes · #138 of 897 destinations to visit in December · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mammoth Lakes in December
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Mammoth Lakes climate normals — December
| Daytime high | 2°C / 36°F | 🧥 cold |
|---|---|---|
| Nighttime low | -7°C / 20°F | |
| Rainfall | 124 mm / 4.9 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 67% | 💧 humid |
| Dew point | -9°C / 17°F | |
| Sunshine | 7.4 h/day | |
| Daylight | 9.6 h | |
| Wind | 11 km/h / 7 mph | |
| Snowfall | 94.4 cm / 37.2 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Mammoth Lakes in December — FAQ
- Is December a good time to visit Mammoth Lakes?
- December in Mammoth Lakes: cold, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Mammoth Lakes on SeasonMap's comfort score (86/100).
- What is the weather like in Mammoth Lakes in December?
- In December, Mammoth Lakes averages a daily high of 2.4°C and a low of -6.6°C, with about 123.7 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Mammoth Lakes in December?
- Mammoth Lakes has a mean US Air Quality Index of about 39 in December.
- Does it snow in Mammoth Lakes in December?
- Mammoth Lakes sees roughly 94.4 cm of snowfall in December.