Average annual temperature is 12.5 °C
Absolute maximum temperature: 41.8 °C
Absolute minimum temperature: -11.7 °C
Number of sunny days: 226 days
Number of rainy days: 120 days
Number of snow days: 19 days
Look at detailed online map of Fort Boise (historical)
* Weather data for Fort Boise (historical) 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) | 11.0 | 13.2 | 15.8 | 32.2 | 33.4 | 35.0 | 41.4 | 41.8 | 32.5 | 28.8 | 15.2 | 11.2 |
| Average daytime temperature (°C) | 5.7 | 7.1 | 9.4 | 17.4 | 26.0 | 28.3 | 37.1 | 33.8 | 28.0 | 20.1 | 9.6 | 5.0 |
| Average temperature (°C) | 0.7 | 0.9 | 3.5 | 9.6 | 18.7 | 21.2 | 29.3 | 26.4 | 20.4 | 13.4 | 4.5 | 1.0 |
| Average night temperature (°C) | -2.6 | -3.4 | -0.9 | 4.1 | 12.2 | 15.3 | 21.8 | 19.8 | 14.1 | 7.9 | 1.0 | -1.7 |
| Absolute minimum temperature (°C) | -11.7 | -10.3 | -7.5 | -2.7 | 4.0 | 7.3 | 17.0 | 12.2 | 8.7 | -3.2 | -7.3 | -5.8 |
| 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) | 5.7 | 7.8 | 7.1 | 9.7 | 12.3 | 12.3 | 13.5 | 11.7 | 10.3 | 8.5 | 6.6 | 3.8 |
| Precipitation (mm) | 26 | 9 | 82 | 26 | 36 | 27 | 0 | 20 | 12 | 16 | 25 | 48 |
| Sunny days | 16 | 18 | 6 | 14 | 18 | 15 | 31 | 22 | 24 | 25 | 20 | 17 |
| Rainy days | 13 | 7 | 16 | 15 | 13 | 15 | 0 | 9 | 6 | 6 | 9 | 11 |
| Snow days | 2 | 3 | 9 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |
The best time to visit Fort Boise (historical) during the most sunny months:
Months with the longest average daylight duration in Fort Boise (historical):
The largest precipitation sum in Fort Boise (historical) is at