Average annual temperature is 22.9 °C
Absolute maximum temperature: 41.8 °C
Absolute minimum temperature: -0.1 °C
Number of sunny days: 196 days
Number of rainy days: 169 days
Look at detailed online map of Helena
* Weather data for Helena 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) | 29.3 | 29.5 | 32.7 | 33.7 | 33.2 | 41.0 | 40.2 | 41.8 | 39.3 | 35.5 | 30.8 | 26.9 |
| Average daytime temperature (°C) | 21.2 | 21.8 | 26.5 | 26.6 | 29.7 | 37.0 | 37.9 | 39.7 | 36.3 | 28.7 | 22.1 | 21.6 |
| Average temperature (°C) | 15.0 | 15.2 | 20.1 | 20.8 | 24.5 | 29.9 | 31.1 | 32.2 | 30.0 | 23.2 | 16.9 | 15.1 |
| Average night temperature (°C) | 10.6 | 10.7 | 15.7 | 16.4 | 20.3 | 24.2 | 25.7 | 26.4 | 25.1 | 19.2 | 13.1 | 10.0 |
| Absolute minimum temperature (°C) | -0.1 | 0.7 | 6.4 | 11.1 | 16.0 | 19.4 | 23.9 | 24.0 | 22.9 | 7.5 | 5.3 | 2.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.2 | 12.0 | 12.9 | 13.6 | 14.0 | 13.8 | 13.2 | 12.3 | 11.5 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 6.7 | 7.0 | 6.7 | 7.9 | 8.8 | 12.2 | 12.3 | 11.9 | 10.8 | 8.3 | 6.3 | 7.5 |
| Precipitation (mm) | 116 | 38 | 56 | 191 | 176 | 16 | 16 | 10 | 39 | 101 | 45 | 42 |
| Sunny days | 18 | 17 | 9 | 11 | 5 | 21 | 22 | 24 | 15 | 14 | 18 | 22 |
| Rainy days | 13 | 11 | 22 | 19 | 26 | 9 | 9 | 7 | 15 | 17 | 12 | 9 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Helena during the most sunny months:
The largest precipitation sum in Helena is at