Average annual temperature is 11.6 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: -19.9 °C
Number of sunny days: 160 days
Number of rainy days: 194 days
Number of snow days: 11 days
Look at detailed online map of Mill Plain
* Weather data for Mill Plain 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) | 17.7 | 16.7 | 15.0 | 30.9 | 27.4 | 32.7 | 31.2 | 29.3 | 33.5 | 27.4 | 18.5 | 14.9 |
| Average daytime temperature (°C) | 6.9 | 6.5 | 8.7 | 16.9 | 20.3 | 24.3 | 28.0 | 25.6 | 22.7 | 18.0 | 9.6 | 7.9 |
| Average temperature (°C) | 3.1 | 1.8 | 3.7 | 11.1 | 14.5 | 18.7 | 23.3 | 21.1 | 18.3 | 13.5 | 5.1 | 3.9 |
| Average night temperature (°C) | 0.0 | -2.3 | -0.4 | 6.6 | 9.1 | 14.3 | 19.8 | 17.5 | 15.1 | 9.9 | 1.6 | 0.8 |
| Absolute minimum temperature (°C) | -5.4 | -19.9 | -5.1 | -1.0 | 4.2 | 8.9 | 15.2 | 14.7 | 8.6 | 3.4 | -4.4 | -6.6 |
| 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 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| 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) | 4.8 | 6.3 | 7.5 | 8.7 | 12.2 | 10.5 | 11.3 | 9.9 | 7.7 | 7.4 | 7.2 | 4.9 |
| Precipitation (mm) | 138 | 44 | 105 | 116 | 51 | 77 | 228 | 102 | 245 | 113 | 57 | 189 |
| Sunny days | 12 | 15 | 12 | 15 | 19 | 7 | 5 | 9 | 13 | 19 | 18 | 16 |
| Rainy days | 17 | 10 | 16 | 15 | 12 | 23 | 26 | 22 | 17 | 12 | 11 | 13 |
| Snow days | 2 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Mill Plain during the most sunny months:
The largest precipitation sum in Mill Plain is at