Average annual temperature is 11.7 °C
Absolute maximum temperature: 30.2 °C
Absolute minimum temperature: -11.5 °C
Number of sunny days: 141 days
Number of rainy days: 214 days
Number of snow days: 10 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) | 18.2 | 23.3 | 21.2 | 26.3 | 25.2 | 28.8 | 30.2 | 29.4 | 28.7 | 25.7 | 22.3 | 15.9 |
| Average daytime temperature (°C) | 8.6 | 11.5 | 11.3 | 18.0 | 19.6 | 23.1 | 27.2 | 25.5 | 22.6 | 17.7 | 11.9 | 8.6 |
| Average temperature (°C) | 3.4 | 5.5 | 5.5 | 11.6 | 14.2 | 17.7 | 21.8 | 20.5 | 17.4 | 12.5 | 6.0 | 3.9 |
| Average night temperature (°C) | 0.3 | 1.1 | 1.1 | 6.6 | 9.6 | 13.2 | 17.5 | 16.7 | 13.5 | 8.3 | 1.8 | 0.8 |
| Absolute minimum temperature (°C) | -9.8 | -11.5 | -10.9 | -1.4 | 1.8 | 7.8 | 14.0 | 11.1 | 9.8 | 1.1 | -8.6 | -7.0 |
| 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 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 9.6 |
| 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) | 4.3 | 6.8 | 7.3 | 9.6 | 10.3 | 11.2 | 12.1 | 10.1 | 9.7 | 7.8 | 7.2 | 5.1 |
| Precipitation (mm) | 85 | 101 | 79 | 95 | 103 | 69 | 76 | 91 | 61 | 46 | 51 | 91 |
| Sunny days | 10 | 11 | 14 | 14 | 12 | 8 | 5 | 8 | 14 | 14 | 18 | 13 |
| Rainy days | 18 | 15 | 16 | 15 | 19 | 22 | 26 | 23 | 16 | 17 | 12 | 15 |
| Snow days | 3 | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The best time to visit Riley during the most sunny months:
The largest precipitation sum in Riley is at