Average annual temperature is 6.9 °C
Absolute maximum temperature: 35.9 °C
Absolute minimum temperature: -34.0 °C
Number of sunny days: 219 days
Number of rainy days: 94 days
Number of snow days: 52 days
Look at detailed online map of Lewis and Clark County
* Weather data for Lewis and Clark County 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) | 7.2 | 6.7 | 9.4 | 23.6 | 28.0 | 28.6 | 34.7 | 35.9 | 30.1 | 24.0 | 13.7 | 12.6 |
| Average daytime temperature (°C) | 1.1 | 1.3 | 2.7 | 10.4 | 20.4 | 21.1 | 28.9 | 28.0 | 22.4 | 12.7 | 7.5 | 5.3 |
| Average temperature (°C) | -3.7 | -4.1 | -4.0 | 3.2 | 13.4 | 14.7 | 20.7 | 19.7 | 14.5 | 5.5 | 1.7 | 0.2 |
| Average night temperature (°C) | -7.1 | -7.8 | -8.0 | -2.3 | 7.0 | 8.6 | 12.3 | 12.8 | 8.3 | 0.8 | -2.3 | -3.2 |
| Absolute minimum temperature (°C) | -24.0 | -34.0 | -15.6 | -13.5 | 1.0 | 1.9 | 6.7 | 8.6 | 1.6 | -15.1 | -10.3 | -7.9 |
| 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) | 9.0 | 10.3 | 11.9 | 13.6 | 15.1 | 15.9 | 15.5 | 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) | 5.1 | 6.0 | 7.8 | 8.7 | 11.0 | 11.5 | 13.8 | 10.8 | 9.7 | 6.6 | 6.5 | 5.3 |
| Precipitation (mm) | 28 | 22 | 33 | 44 | 100 | 62 | 3 | 33 | 47 | 42 | 11 | 8 |
| Sunny days | 19 | 18 | 14 | 13 | 10 | 12 | 22 | 23 | 21 | 19 | 22 | 26 |
| Rainy days | 2 | 1 | 1 | 8 | 21 | 18 | 9 | 8 | 9 | 8 | 7 | 2 |
| Snow days | 10 | 9 | 16 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 1 | 3 |
The best time to visit Lewis and Clark County during the most sunny months:
Months with the longest average daylight duration in Lewis and Clark County:
The largest precipitation sum in Lewis and Clark County is at