Boise in December
4.6out of 10
Not the best time
Cold: highs around 4°C. Frequent rain: about 10 rainy days.
4°CAvg high
-2°CAvg low
10Rainy days (50 mm)
8:46 hDaylight
08:18Sunrise · 17:04 Sunset
Why this score
- Cold: highs around 4°C
- Frequent rain: about 10 rainy days
- Nights fall to about -2°C
- Rain varies a lot between years (±4.7 days)
What to wear and pack
- Winter coat, hat and scarf
- Rain jacket or compact umbrella
- Gloves for freezing mornings
How reliable is the forecast?
Rain in December varies a lot between years (±4.7 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 5°C | -3°C | 46 mm | 10 | – | – | 4.7 |
| February | 8°C | -1°C | 31 mm | 8 | – | – | 5.6 |
| March | 14°C | 3°C | 36 mm | 9 | – | – | 6.6 |
| April | 18°C | 5°C | 31 mm | 7 | – | – | 7.5 |
| May | 24°C | 9°C | 31 mm | 6 | – | – | 8.3 |
| June | 29°C | 13°C | 16 mm | 3 | – | – | 8.7 |
| July | 35°C | 17°C | 3 mm | 1 | – | – | 7.4 |
| August | 34°C | 17°C | 3 mm | 1 | – | – | 7.6 |
| September | 28°C | 12°C | 10 mm | 2 | – | – | 8.8 |
| October | 19°C | 6°C | 22 mm | 4 | – | – | 8.1 |
| November | 10°C | 1°C | 34 mm | 8 | – | – | 6.0 |
| December | 4°C | -2°C | 50 mm | 10 | – | – | 4.6 |
Frequently asked questions
How hot is Boise in December?
Daytime highs average 4°C and nights about -2°C.
When is the best time to visit Boise?
The best months are September, June, May.