Average annual temperature is 13.0 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: -10.0 °C
Number of sunny days: 159 days
Number of rainy days: 199 days
Number of snow days: 7 days
Look at detailed online map of Lewis County
* Weather data for Lewis 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) | 20.5 | 22.0 | 22.8 | 28.9 | 27.5 | 31.0 | 31.9 | 30.6 | 30.7 | 27.7 | 22.1 | 18.6 |
| Average daytime temperature (°C) | 9.8 | 12.6 | 12.6 | 19.6 | 21.6 | 25.5 | 28.6 | 27.0 | 24.1 | 19.1 | 13.0 | 10.2 |
| Average temperature (°C) | 4.7 | 6.3 | 6.5 | 12.9 | 15.6 | 19.5 | 23.1 | 21.8 | 18.7 | 13.8 | 6.9 | 5.2 |
| Average night temperature (°C) | 1.4 | 1.7 | 1.7 | 7.3 | 10.4 | 14.4 | 18.7 | 17.6 | 14.6 | 9.8 | 2.5 | 1.8 |
| Absolute minimum temperature (°C) | -6.7 | -10.0 | -8.5 | 0.6 | 2.6 | 9.2 | 15.4 | 11.8 | 9.8 | 2.1 | -7.0 | -4.4 |
| 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 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.4 | 11.2 | 10.1 | 9.5 |
| 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) | 4.0 | 6.6 | 7.1 | 8.9 | 9.5 | 11.2 | 11.7 | 10.6 | 9.2 | 7.4 | 7.1 | 4.9 |
| Precipitation (mm) | 98 | 77 | 90 | 53 | 109 | 78 | 111 | 107 | 88 | 72 | 54 | 77 |
| Sunny days | 7 | 14 | 14 | 18 | 16 | 11 | 8 | 8 | 14 | 16 | 20 | 13 |
| Rainy days | 22 | 12 | 16 | 12 | 15 | 19 | 23 | 23 | 16 | 15 | 9 | 17 |
| Snow days | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Lewis County during the most sunny months:
The largest precipitation sum in Lewis County is at