Average annual temperature is 9.3 °C
Absolute maximum temperature: 37.7 °C
Absolute minimum temperature: -32.5 °C
Number of sunny days: 213 days
Number of rainy days: 108 days
Number of snow days: 44 days
Look at detailed online map of Great Falls
* Weather data for Great Falls 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) | 11.4 | 9.8 | 12.5 | 23.9 | 29.1 | 30.6 | 36.7 | 37.7 | 33.0 | 26.3 | 15.8 | 16.1 |
| Average daytime temperature (°C) | 3.5 | 3.9 | 4.3 | 12.0 | 21.5 | 22.9 | 30.2 | 30.0 | 24.2 | 13.9 | 9.8 | 8.1 |
| Average temperature (°C) | -0.6 | -1.6 | -2.0 | 5.4 | 14.9 | 17.0 | 22.7 | 22.2 | 17.1 | 7.7 | 4.6 | 3.3 |
| Average night temperature (°C) | -3.1 | -5.0 | -5.8 | 0.7 | 9.1 | 11.6 | 15.4 | 15.8 | 11.6 | 3.5 | 1.0 | -0.1 |
| Absolute minimum temperature (°C) | -18.7 | -32.5 | -12.5 | -10.9 | 4.9 | 5.2 | 10.2 | 11.0 | 6.3 | -13.2 | -7.4 | -5.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 |
| Daylight mean duration (h) | 8.9 | 10.3 | 11.9 | 13.6 | 15.1 | 15.9 | 15.5 | 14.2 | 12.6 | 10.9 | 9.3 | 8.5 |
| 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) | 5.0 | 6.4 | 7.9 | 9.4 | 11.6 | 11.9 | 13.9 | 11.5 | 9.9 | 6.9 | 6.5 | 5.7 |
| Precipitation (mm) | 32 | 21 | 23 | 64 | 65 | 67 | 2 | 22 | 49 | 35 | 12 | 8 |
| Sunny days | 15 | 16 | 15 | 14 | 12 | 11 | 25 | 19 | 22 | 17 | 23 | 24 |
| Rainy days | 5 | 1 | 3 | 11 | 19 | 19 | 6 | 12 | 8 | 11 | 7 | 6 |
| Snow days | 11 | 11 | 13 | 5 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 1 |
The best time to visit Great Falls during the most sunny months:
Months with the longest average daylight duration in Great Falls:
The largest precipitation sum in Great Falls is at