Average annual temperature is 15.6 °C
Absolute maximum temperature: 36.4 °C
Absolute minimum temperature: -6.5 °C
Number of sunny days: 171 days
Number of rainy days: 192 days
Number of snow days: 2 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) | 20.5 | 25.5 | 25.5 | 28.1 | 29.1 | 33.1 | 35.6 | 36.4 | 32.2 | 29.6 | 26.5 | 18.8 |
| Average daytime temperature (°C) | 12.3 | 15.5 | 16.1 | 20.4 | 24.8 | 28.2 | 30.6 | 29.7 | 27.6 | 22.2 | 16.6 | 12.7 |
| Average temperature (°C) | 7.5 | 9.7 | 10.1 | 14.4 | 18.7 | 21.9 | 24.8 | 24.3 | 21.5 | 16.4 | 10.4 | 7.4 |
| Average night temperature (°C) | 4.0 | 5.7 | 5.3 | 9.3 | 13.7 | 16.5 | 20.3 | 19.8 | 16.6 | 11.8 | 6.1 | 3.6 |
| Absolute minimum temperature (°C) | -4.9 | -5.2 | -6.5 | 2.1 | 4.7 | 11.2 | 14.2 | 14.4 | 12.2 | 3.8 | -4.8 | -4.9 |
| 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 | 14.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.1 | 6.1 | 8.5 | 9.3 | 10.9 | 11.0 | 11.0 | 10.2 | 10.4 | 8.0 | 7.7 | 6.4 |
| Precipitation (mm) | 165 | 112 | 105 | 80 | 103 | 112 | 129 | 114 | 61 | 32 | 52 | 122 |
| Sunny days | 11 | 15 | 19 | 18 | 8 | 14 | 6 | 12 | 15 | 18 | 20 | 15 |
| Rainy days | 19 | 13 | 11 | 12 | 23 | 16 | 25 | 19 | 15 | 13 | 10 | 16 |
| Snow days | 1 | 0 | 1 | 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