Average annual temperature is 7.2 °C
Absolute maximum temperature: 35.8 °C
Absolute minimum temperature: -28.4 °C
Number of sunny days: 205 days
Number of rainy days: 110 days
Number of snow days: 50 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) | 9.1 | 10.5 | 11.0 | 23.8 | 28.2 | 30.3 | 34.8 | 35.8 | 30.3 | 22.8 | 16.0 | 14.8 |
| Average daytime temperature (°C) | 1.0 | 3.2 | 3.1 | 11.1 | 21.7 | 21.9 | 29.9 | 28.8 | 22.4 | 13.0 | 8.0 | 4.6 |
| Average temperature (°C) | -4.4 | -3.7 | -3.5 | 3.5 | 14.2 | 15.4 | 21.6 | 20.3 | 14.5 | 6.1 | 1.6 | -0.6 |
| Average night temperature (°C) | -8.9 | -8.7 | -8.2 | -2.6 | 7.2 | 9.2 | 12.7 | 13.4 | 8.0 | 1.3 | -2.9 | -4.1 |
| Absolute minimum temperature (°C) | -28.4 | -27.2 | -14.4 | -11.6 | 0.6 | 1.4 | 7.3 | 9.8 | 2.3 | -15.2 | -9.0 | -11.1 |
| 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 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.3 | 11.9 | 13.6 | 15.0 | 15.8 | 15.4 | 14.2 | 12.6 | 10.9 | 9.4 | 8.6 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 5.3 | 6.3 | 8.0 | 9.8 | 11.7 | 11.5 | 13.8 | 11.2 | 10.1 | 7.4 | 6.7 | 5.6 |
| Precipitation (mm) | 22 | 11 | 40 | 45 | 39 | 43 | 2 | 44 | 55 | 39 | 14 | 9 |
| Sunny days | 17 | 17 | 14 | 12 | 9 | 10 | 23 | 23 | 19 | 19 | 21 | 21 |
| Rainy days | 2 | 3 | 2 | 10 | 22 | 20 | 8 | 8 | 11 | 10 | 9 | 5 |
| Snow days | 12 | 8 | 15 | 8 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 5 |
The best time to visit Helena during the most sunny months:
Months with the longest average daylight duration in Helena:
The largest precipitation sum in Helena is at