Average annual temperature is 14.9 °C
Absolute maximum temperature: 39.0 °C
Absolute minimum temperature: -13.7 °C
Number of sunny days: 252 days
Number of rainy days: 104 days
Number of snow days: 9 days
Look at detailed online map of Riley
* Weather data for Riley 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) | 15.7 | 15.6 | 23.0 | 30.5 | 31.7 | 37.0 | 39.0 | 37.6 | 34.8 | 28.8 | 25.3 | 16.3 |
| Average daytime temperature (°C) | 7.2 | 10.0 | 15.2 | 22.4 | 26.6 | 31.6 | 36.1 | 32.3 | 29.4 | 23.7 | 15.0 | 9.0 |
| Average temperature (°C) | 1.4 | 3.1 | 8.0 | 14.5 | 19.7 | 24.8 | 29.7 | 25.9 | 22.7 | 16.8 | 8.5 | 3.4 |
| Average night temperature (°C) | -3.3 | -2.0 | 2.1 | 6.5 | 12.3 | 16.7 | 22.6 | 19.7 | 15.9 | 9.8 | 2.7 | -1.2 |
| Absolute minimum temperature (°C) | -13.7 | -10.1 | -3.3 | -4.7 | 8.3 | 11.8 | 18.7 | 17.0 | 11.2 | -3.2 | -4.7 | -5.9 |
| 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 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 8.2 | 9.0 | 9.4 | 11.5 | 12.4 | 12.9 | 12.7 | 11.6 | 10.9 | 10.3 | 9.0 | 8.4 |
| Precipitation (mm) | 25 | 16 | 25 | 3 | 27 | 8 | 8 | 39 | 19 | 6 | 35 | 24 |
| Sunny days | 24 | 18 | 21 | 25 | 18 | 21 | 20 | 17 | 19 | 23 | 21 | 25 |
| Rainy days | 4 | 6 | 8 | 5 | 13 | 9 | 11 | 14 | 11 | 8 | 9 | 6 |
| Snow days | 3 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Riley is at