Average annual temperature is 10.2 °C
Absolute maximum temperature: 38.1 °C
Absolute minimum temperature: -28.7 °C
Number of sunny days: 196 days
Number of rainy days: 143 days
Number of snow days: 26 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) | 6.9 | 9.2 | 22.0 | 25.9 | 30.5 | 31.2 | 33.0 | 38.1 | 34.1 | 30.5 | 17.1 | 12.1 |
| Average daytime temperature (°C) | -0.7 | 2.5 | 6.2 | 15.2 | 23.5 | 27.9 | 27.8 | 28.1 | 25.6 | 16.2 | 9.0 | 5.5 |
| Average temperature (°C) | -4.7 | -3.3 | 0.7 | 8.8 | 16.9 | 22.1 | 22.4 | 22.8 | 19.7 | 11.7 | 3.8 | 1.1 |
| Average night temperature (°C) | -7.7 | -7.7 | -3.4 | 3.6 | 10.8 | 16.4 | 16.9 | 18.0 | 14.9 | 7.7 | -0.2 | -1.7 |
| Absolute minimum temperature (°C) | -28.7 | -25.8 | -14.4 | -4.8 | 1.1 | 8.3 | 11.9 | 11.6 | 8.0 | -5.4 | -14.0 | -8.2 |
| 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) | 9.4 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.2 | 6.9 | 7.0 | 8.8 | 11.9 | 12.2 | 12.4 | 11.5 | 9.6 | 6.7 | 6.9 | 4.3 |
| Precipitation (mm) | 57 | 46 | 94 | 63 | 49 | 24 | 83 | 54 | 90 | 85 | 11 | 34 |
| Sunny days | 18 | 16 | 13 | 16 | 19 | 17 | 12 | 15 | 12 | 16 | 24 | 18 |
| Rainy days | 6 | 9 | 10 | 13 | 12 | 13 | 19 | 16 | 18 | 13 | 6 | 8 |
| Snow days | 7 | 3 | 8 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 5 |
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