Average annual temperature is 8.0 °C
Absolute maximum temperature: 32.5 °C
Absolute minimum temperature: -31.3 °C
Number of sunny days: 156 days
Number of rainy days: 177 days
Number of snow days: 32 days
Look at detailed online map of Sumner
* Weather data for Sumner 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) | 8.3 | 9.2 | 8.3 | 25.9 | 29.2 | 32.5 | 30.2 | 27.1 | 30.1 | 26.6 | 13.7 | 12.1 |
| Average daytime temperature (°C) | 1.8 | -0.3 | 4.0 | 12.3 | 18.7 | 20.6 | 25.6 | 22.8 | 22.1 | 16.0 | 5.6 | 3.3 |
| Average temperature (°C) | -2.2 | -5.9 | -0.5 | 6.4 | 12.5 | 16.0 | 21.2 | 18.3 | 17.2 | 11.4 | 1.1 | -0.5 |
| Average night temperature (°C) | -5.4 | -10.8 | -4.4 | 1.8 | 7.0 | 12.4 | 17.5 | 14.4 | 13.2 | 7.7 | -2.4 | -3.7 |
| Absolute minimum temperature (°C) | -14.3 | -31.3 | -11.2 | -9.7 | -0.2 | 6.3 | 12.3 | 10.0 | 6.5 | -1.5 | -8.0 | -12.7 |
| 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 | 9.0 |
| Daylight mean duration (h) | 9.3 | 10.5 | 11.9 | 13.5 | 14.8 | 15.5 | 15.1 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 4.1 | 6.9 | 7.5 | 7.4 | 10.9 | 6.4 | 9.4 | 9.5 | 8.8 | 6.0 | 6.7 | 4.4 |
| Precipitation (mm) | 133 | 40 | 81 | 84 | 172 | 247 | 213 | 157 | 109 | 116 | 67 | 224 |
| Sunny days | 10 | 15 | 12 | 16 | 19 | 6 | 2 | 9 | 13 | 13 | 23 | 18 |
| Rainy days | 11 | 6 | 7 | 14 | 12 | 24 | 29 | 22 | 17 | 18 | 6 | 11 |
| Snow days | 10 | 7 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Sumner during the most sunny months:
Months with the longest average daylight duration in Sumner:
The largest precipitation sum in Sumner is at