Average annual temperature is 11.5 °C
Absolute maximum temperature: 37.9 °C
Absolute minimum temperature: -22.4 °C
Number of sunny days: 223 days
Number of rainy days: 122 days
Number of snow days: 20 days
Look at detailed online map of Prosser
* Weather data for Prosser 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) | 10.3 | 14.4 | 21.2 | 28.1 | 30.8 | 33.0 | 36.3 | 37.9 | 34.8 | 31.1 | 20.2 | 12.4 |
| Average daytime temperature (°C) | 0.8 | 4.9 | 9.2 | 18.4 | 24.8 | 28.5 | 29.5 | 30.5 | 28.2 | 18.5 | 12.2 | 5.3 |
| Average temperature (°C) | -3.7 | -2.0 | 2.1 | 11.0 | 18.4 | 22.5 | 23.7 | 24.4 | 21.6 | 12.5 | 6.1 | 0.9 |
| Average night temperature (°C) | -7.3 | -6.4 | -3.1 | 4.9 | 12.8 | 17.0 | 18.9 | 19.4 | 15.9 | 7.6 | 1.3 | -2.5 |
| Absolute minimum temperature (°C) | -22.4 | -19.7 | -10.0 | -5.5 | 2.5 | 11.0 | 13.2 | 13.1 | 9.1 | -7.6 | -6.0 | -9.1 |
| 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 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 6.0 | 8.1 | 8.7 | 10.8 | 11.1 | 12.3 | 12.1 | 11.5 | 10.6 | 8.0 | 7.2 | 4.8 |
| Precipitation (mm) | 51 | 34 | 38 | 9 | 35 | 134 | 106 | 15 | 13 | 65 | 21 | 52 |
| Sunny days | 21 | 19 | 23 | 23 | 11 | 12 | 14 | 19 | 21 | 17 | 23 | 20 |
| Rainy days | 4 | 4 | 6 | 6 | 20 | 18 | 17 | 12 | 9 | 13 | 4 | 9 |
| Snow days | 6 | 5 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 2 |
The best time to visit Prosser during the most sunny months:
The largest precipitation sum in Prosser is at