Average annual temperature is 14.0 °C
Absolute maximum temperature: 42.2 °C
Absolute minimum temperature: -14.1 °C
Number of sunny days: 231 days
Number of rainy days: 125 days
Number of snow days: 9 days
Look at detailed online map of Riley County
* Weather data for Riley County 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) | 13.5 | 17.2 | 23.5 | 30.5 | 33.3 | 37.0 | 39.3 | 42.2 | 37.1 | 33.0 | 22.2 | 16.8 |
| Average daytime temperature (°C) | 5.1 | 9.1 | 11.2 | 21.7 | 27.0 | 31.0 | 32.7 | 33.7 | 30.3 | 20.6 | 13.1 | 8.1 |
| Average temperature (°C) | 0.0 | 1.8 | 4.9 | 13.4 | 20.0 | 24.6 | 26.3 | 27.0 | 23.7 | 14.7 | 7.3 | 3.4 |
| Average night temperature (°C) | -3.7 | -3.4 | 0.3 | 7.1 | 14.0 | 18.6 | 21.1 | 21.4 | 18.1 | 9.9 | 2.9 | 0.1 |
| Absolute minimum temperature (°C) | -13.2 | -14.1 | -8.7 | -2.5 | 5.1 | 12.1 | 16.1 | 14.7 | 12.7 | -5.2 | -5.8 | -5.3 |
| 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) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.5 | 11.2 | 10.0 | 9.5 |
| 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) | 6.6 | 8.6 | 8.0 | 10.4 | 10.9 | 12.7 | 11.6 | 11.9 | 10.4 | 7.9 | 7.0 | 5.5 |
| Precipitation (mm) | 41 | 44 | 28 | 63 | 41 | 41 | 69 | 55 | 66 | 32 | 35 | 61 |
| Sunny days | 22 | 22 | 17 | 22 | 15 | 15 | 12 | 24 | 23 | 17 | 23 | 19 |
| Rainy days | 7 | 5 | 13 | 8 | 16 | 15 | 19 | 7 | 7 | 13 | 5 | 10 |
| Snow days | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 2 |
The best time to visit Riley County during the most sunny months:
The largest precipitation sum in Riley County is at