Average annual temperature is 11.7 °C
Absolute maximum temperature: 32.3 °C
Absolute minimum temperature: -12.7 °C
Number of sunny days: 167 days
Number of rainy days: 186 days
Number of snow days: 12 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) | 15.2 | 19.1 | 16.5 | 26.6 | 31.2 | 31.7 | 32.3 | 31.2 | 32.1 | 29.0 | 18.8 | 17.2 |
| Average daytime temperature (°C) | 4.9 | 8.4 | 8.5 | 16.9 | 21.8 | 25.8 | 28.6 | 26.9 | 24.4 | 17.4 | 10.7 | 8.5 |
| Average temperature (°C) | 1.5 | 2.1 | 3.4 | 10.2 | 14.9 | 20.0 | 23.2 | 21.5 | 19.3 | 13.0 | 5.6 | 4.8 |
| Average night temperature (°C) | -1.4 | -2.0 | -0.2 | 4.5 | 9.3 | 14.7 | 18.4 | 16.8 | 14.7 | 9.4 | 1.9 | 2.1 |
| Absolute minimum temperature (°C) | -12.7 | -11.8 | -6.8 | -3.6 | 2.7 | 10.5 | 15.3 | 11.4 | 9.0 | -2.3 | -6.8 | -3.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.1 | 7.3 | 6.7 | 8.9 | 10.8 | 11.2 | 12.0 | 10.7 | 9.4 | 6.8 | 7.1 | 3.7 |
| Precipitation (mm) | 93 | 79 | 136 | 91 | 56 | 93 | 94 | 153 | 27 | 71 | 37 | 62 |
| Sunny days | 10 | 17 | 11 | 12 | 23 | 16 | 6 | 14 | 16 | 13 | 19 | 10 |
| Rainy days | 17 | 10 | 16 | 18 | 8 | 14 | 25 | 17 | 14 | 17 | 10 | 20 |
| Snow days | 4 | 1 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
The best time to visit Helena during the most sunny months:
The largest precipitation sum in Helena is at