Average annual temperature is 10.1 °C
Absolute maximum temperature: 36.5 °C
Absolute minimum temperature: -26.0 °C
Number of sunny days: 184 days
Number of rainy days: 146 days
Number of snow days: 35 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) | 7.8 | 9.6 | 19.7 | 25.3 | 31.3 | 32.3 | 32.9 | 36.5 | 34.0 | 28.7 | 17.2 | 11.9 |
| Average daytime temperature (°C) | 0.7 | 2.9 | 6.0 | 14.5 | 22.4 | 27.6 | 28.1 | 27.6 | 24.0 | 15.4 | 8.0 | 4.8 |
| Average temperature (°C) | -3.0 | -2.5 | 0.7 | 8.4 | 15.4 | 21.1 | 22.6 | 22.1 | 18.9 | 11.3 | 3.5 | 1.4 |
| Average night temperature (°C) | -5.6 | -6.9 | -3.3 | 3.3 | 9.6 | 15.1 | 17.6 | 17.7 | 15.1 | 7.7 | 0.2 | -1.0 |
| Absolute minimum temperature (°C) | -26.0 | -24.5 | -16.3 | -3.9 | 0.0 | 6.6 | 12.9 | 11.2 | 8.5 | -3.9 | -12.9 | -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 | 14.7 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.7 | 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 | 8.0 |
| Sunshine mean duration (h) | 3.6 | 6.8 | 6.6 | 8.2 | 10.7 | 12.2 | 12.8 | 11.2 | 8.9 | 6.6 | 6.7 | 4.0 |
| Precipitation (mm) | 53 | 77 | 86 | 96 | 47 | 22 | 91 | 86 | 110 | 90 | 34 | 49 |
| Sunny days | 13 | 15 | 10 | 16 | 21 | 20 | 13 | 13 | 12 | 13 | 23 | 15 |
| Rainy days | 8 | 8 | 11 | 13 | 10 | 10 | 18 | 18 | 18 | 16 | 6 | 10 |
| Snow days | 10 | 5 | 10 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 6 |
The best time to visit Riley during the most sunny months:
Months with the longest average daylight duration in Riley:
The largest precipitation sum in Riley is at