Average annual temperature is 14.6 °C
Absolute maximum temperature: 42.0 °C
Absolute minimum temperature: -7.8 °C
Number of sunny days: 223 days
Number of rainy days: 118 days
Number of snow days: 24 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) | 18.1 | 22.0 | 14.0 | 32.1 | 33.5 | 38.2 | 42.0 | 41.6 | 35.1 | 30.8 | 24.4 | 18.3 |
| Average daytime temperature (°C) | 11.1 | 13.1 | 9.2 | 19.2 | 25.4 | 29.9 | 37.0 | 34.9 | 27.9 | 24.4 | 17.1 | 13.5 |
| Average temperature (°C) | 6.0 | 5.7 | 4.1 | 11.2 | 17.5 | 21.4 | 27.1 | 25.8 | 19.9 | 16.0 | 10.8 | 8.7 |
| Average night temperature (°C) | 2.7 | 1.3 | 0.4 | 5.6 | 11.1 | 14.0 | 18.5 | 18.4 | 13.9 | 10.5 | 6.9 | 6.0 |
| Absolute minimum temperature (°C) | -3.2 | -5.4 | -7.8 | -0.6 | 3.3 | 6.2 | 14.2 | 12.2 | 8.5 | 2.2 | 1.2 | 0.2 |
| 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 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 5.0 | 7.0 | 6.4 | 9.9 | 11.4 | 13.2 | 13.7 | 12.1 | 10.4 | 8.9 | 7.1 | 4.5 |
| Precipitation (mm) | 300 | 112 | 303 | 52 | 66 | 22 | 0 | 26 | 56 | 47 | 62 | 169 |
| Sunny days | 14 | 15 | 6 | 19 | 17 | 20 | 30 | 26 | 23 | 21 | 18 | 14 |
| Rainy days | 13 | 6 | 16 | 8 | 14 | 10 | 1 | 5 | 7 | 10 | 11 | 17 |
| Snow days | 4 | 7 | 9 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The best time to visit Helena during the most sunny months:
The largest precipitation sum in Helena is at