Average annual temperature is 10.3 °C
Absolute maximum temperature: 36.9 °C
Absolute minimum temperature: -9.5 °C
Number of sunny days: 154 days
Number of rainy days: 203 days
Number of snow days: 8 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) | 12.4 | 14.2 | 16.2 | 28.6 | 30.2 | 28.8 | 31.7 | 36.9 | 30.1 | 26.9 | 14.8 | 14.7 |
| Average daytime temperature (°C) | 7.6 | 6.8 | 8.5 | 11.5 | 21.4 | 22.1 | 26.6 | 27.7 | 20.9 | 16.9 | 11.3 | 9.7 |
| Average temperature (°C) | 4.1 | 2.5 | 3.6 | 6.7 | 14.1 | 14.9 | 18.5 | 19.8 | 14.8 | 11.4 | 6.8 | 6.3 |
| Average night temperature (°C) | 1.8 | 0.0 | 0.2 | 3.3 | 9.1 | 9.4 | 11.9 | 14.1 | 10.7 | 8.1 | 4.2 | 4.3 |
| Absolute minimum temperature (°C) | -6.0 | -8.9 | -9.5 | -4.1 | 5.6 | 6.1 | 9.2 | 9.7 | 6.3 | -2.5 | -1.7 | -0.1 |
| 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) | 3.9 | 4.0 | 6.3 | 5.8 | 10.2 | 11.3 | 13.2 | 11.2 | 8.3 | 6.6 | 4.8 | 2.9 |
| Precipitation (mm) | 163 | 188 | 178 | 254 | 47 | 37 | 13 | 24 | 121 | 168 | 268 | 403 |
| Sunny days | 5 | 8 | 4 | 6 | 15 | 18 | 28 | 19 | 17 | 15 | 13 | 6 |
| Rainy days | 24 | 16 | 25 | 24 | 16 | 12 | 3 | 12 | 13 | 16 | 17 | 25 |
| Snow days | 2 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Lewis County during the most sunny months:
Months with the longest average daylight duration in Lewis County:
The largest precipitation sum in Lewis County is at