Average annual temperature is 5.4 °C
Absolute maximum temperature: 31.7 °C
Absolute minimum temperature: -22.2 °C
Number of sunny days: 171 days
Number of rainy days: 121 days
Number of snow days: 73 days
Look at detailed online map of Boise County
* Weather data for Boise County United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 5.9 | 3.8 | 6.8 | 20.1 | 24.6 | 25.6 | 31.5 | 31.7 | 25.1 | 22.3 | 12.1 | 8.8 |
| Average daytime temperature (°C) | -0.5 | 0.2 | 1.2 | 6.9 | 16.2 | 19.0 | 27.7 | 25.6 | 20.6 | 14.0 | 6.3 | 3.4 |
| Average temperature (°C) | -4.8 | -5.5 | -3.3 | 1.3 | 8.7 | 12.4 | 19.6 | 18.0 | 13.1 | 7.1 | 0.2 | -3.2 |
| Average night temperature (°C) | -8.1 | -9.7 | -6.8 | -3.0 | 2.1 | 6.0 | 10.6 | 10.9 | 6.8 | 2.1 | -4.3 | -8.3 |
| Absolute minimum temperature (°C) | -19.9 | -15.6 | -12.5 | -10.6 | -2.5 | -2.8 | 6.7 | 4.6 | 0.7 | -10.1 | -12.6 | -22.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.3 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.1 | 14.0 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 5.4 | 6.8 | 6.7 | 9.7 | 11.4 | 11.6 | 13.5 | 11.6 | 10.2 | 8.2 | 6.5 | 5.1 |
| Precipitation (mm) | 68 | 66 | 173 | 75 | 113 | 141 | 1 | 66 | 17 | 49 | 63 | 86 |
| Sunny days | 12 | 11 | 6 | 11 | 8 | 5 | 28 | 16 | 21 | 20 | 17 | 16 |
| Rainy days | 4 | 2 | 8 | 6 | 23 | 25 | 3 | 15 | 9 | 10 | 9 | 7 |
| Snow days | 15 | 15 | 17 | 13 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 8 |
The best time to visit Boise County during the most sunny months:
Months with the longest average daylight duration in Boise County:
The largest precipitation sum in Boise County is at