Average annual temperature is 13.3 °C
Absolute maximum temperature: 36.6 °C
Absolute minimum temperature: -15.3 °C
Number of sunny days: 211 days
Number of rainy days: 145 days
Number of snow days: 9 days
Look at detailed online map of Lewistown
* Weather data for Lewistown 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) | 16.2 | 16.1 | 22.6 | 28.0 | 31.2 | 33.4 | 36.0 | 36.6 | 33.2 | 30.3 | 22.1 | 16.0 |
| Average daytime temperature (°C) | 5.4 | 9.0 | 10.3 | 19.3 | 25.4 | 29.7 | 30.5 | 29.0 | 27.4 | 19.6 | 12.3 | 8.4 |
| Average temperature (°C) | 0.7 | 2.5 | 4.7 | 12.2 | 18.9 | 23.6 | 24.9 | 24.1 | 21.2 | 14.6 | 6.9 | 4.4 |
| Average night temperature (°C) | -2.4 | -2.3 | 0.7 | 6.3 | 12.9 | 17.8 | 19.8 | 19.9 | 16.0 | 10.4 | 2.5 | 1.5 |
| Absolute minimum temperature (°C) | -13.1 | -15.3 | -10.4 | -1.0 | 4.9 | 10.0 | 15.1 | 13.3 | 11.6 | -2.4 | -8.3 | -6.5 |
| 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 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| 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) | 5.5 | 7.7 | 6.8 | 10.3 | 11.5 | 12.6 | 12.1 | 10.2 | 10.3 | 7.2 | 7.7 | 5.0 |
| Precipitation (mm) | 47 | 80 | 108 | 31 | 50 | 27 | 68 | 136 | 31 | 86 | 13 | 92 |
| Sunny days | 18 | 19 | 12 | 19 | 21 | 20 | 14 | 12 | 22 | 15 | 24 | 15 |
| Rainy days | 9 | 7 | 18 | 11 | 10 | 10 | 17 | 19 | 8 | 16 | 5 | 15 |
| Snow days | 4 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Lewistown during the most sunny months:
The largest precipitation sum in Lewistown is at