Boise weather in December
December in Boise: cold, a little rain, with clean air — a fair time to visit.
#12 of 12 months in Boise · #458 of 604 destinations to visit in December · comfort 53/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Boise climate normals — December
| Daytime high | 5°C / 41°F | 🧥 cold |
|---|---|---|
| Nighttime low | -2°C / 28°F | |
| Feels like (high) | 1°C / 34°F | |
| Rainfall | 48 mm / 1.9 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | -4°C / 25°F | |
| Sunshine | 5.8 h/day | |
| Daylight | 9 h | |
| Wind | 17 km/h / 10 mph | |
| Snowfall | 13.7 cm / 5.4 in | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Boise?
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Boise in December — FAQ
- Is December a good time to visit Boise?
- December in Boise: cold, a little rain, with clean air — a fair time to visit. It ranks #12 of 12 months for Boise on SeasonMap's comfort score (53/100).
- What is the weather like in Boise in December?
- In December, Boise averages a daily high of 5.1°C and a low of -2.5°C, with about 48.3 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Boise in December?
- Boise has a mean US Air Quality Index of about 37 in December.
- Does it snow in Boise in December?
- Boise sees roughly 13.7 cm of snowfall in December.