Average annual temperature is 8.2 °C
Absolute maximum temperature: 33.6 °C
Absolute minimum temperature: -16.1 °C
Number of sunny days: 225 days
Number of rainy days: 105 days
Number of snow days: 35 days
Look at detailed online map of Riordan
* Weather data for Riordan 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) | 9.2 | 7.7 | 7.9 | 19.4 | 20.7 | 28.6 | 33.6 | 29.8 | 27.5 | 24.2 | 20.0 | 12.8 |
| Average daytime temperature (°C) | 0.9 | 2.3 | 3.9 | 11.3 | 17.7 | 22.3 | 29.7 | 25.3 | 22.5 | 17.8 | 10.7 | 7.3 |
| Average temperature (°C) | -3.3 | -3.3 | -0.8 | 4.3 | 10.7 | 15.3 | 22.8 | 19.0 | 15.9 | 11.1 | 4.9 | 1.5 |
| Average night temperature (°C) | -6.7 | -7.1 | -4.4 | -1.3 | 4.0 | 8.2 | 16.4 | 13.8 | 10.3 | 5.8 | 0.4 | -2.3 |
| Absolute minimum temperature (°C) | -14.4 | -16.1 | -10.3 | -13.2 | -1.4 | 3.2 | 13.0 | 11.8 | 5.9 | -3.4 | -9.8 | -7.5 |
| 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 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.8 | 8.9 | 8.4 | 12.2 | 12.6 | 13.2 | 12.7 | 11.8 | 10.7 | 10.3 | 8.7 | 8.1 |
| Precipitation (mm) | 151 | 83 | 175 | 2 | 41 | 12 | 30 | 67 | 24 | 8 | 14 | 10 |
| Sunny days | 16 | 18 | 13 | 27 | 16 | 22 | 17 | 7 | 15 | 25 | 24 | 25 |
| Rainy days | 1 | 3 | 9 | 3 | 15 | 8 | 14 | 24 | 15 | 6 | 4 | 3 |
| Snow days | 14 | 7 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The best time to visit Riordan during the most sunny months:
The largest precipitation sum in Riordan is at