Average annual temperature is 21.9 °C
Absolute maximum temperature: 37.6 °C
Absolute minimum temperature: 1.2 °C
Number of sunny days: 140 days
Number of rainy days: 225 days
Look at detailed online map of Roy
* Weather data for Roy 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) | 27.9 | 28.9 | 31.6 | 31.7 | 32.5 | 35.0 | 36.3 | 37.6 | 35.6 | 30.4 | 28.4 | 26.6 |
| Average daytime temperature (°C) | 21.9 | 25.0 | 25.7 | 27.9 | 28.6 | 31.3 | 33.6 | 34.1 | 31.0 | 27.0 | 22.9 | 20.3 |
| Average temperature (°C) | 15.5 | 18.7 | 19.6 | 22.0 | 23.1 | 25.7 | 27.7 | 28.4 | 25.6 | 22.2 | 18.3 | 15.9 |
| Average night temperature (°C) | 11.1 | 13.9 | 15.0 | 17.6 | 18.7 | 21.8 | 24.0 | 24.5 | 21.9 | 18.6 | 14.9 | 12.5 |
| Absolute minimum temperature (°C) | 1.2 | 6.6 | 4.8 | 11.7 | 14.1 | 18.4 | 22.4 | 22.1 | 17.9 | 11.2 | 5.3 | 3.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.6 | 14.0 | 13.8 | 13.2 | 12.3 | 11.5 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.4 | 9.1 | 9.7 | 9.6 | 11.3 | 10.7 | 11.1 | 11.4 | 9.9 | 9.3 | 6.7 | 6.8 |
| Precipitation (mm) | 27 | 48 | 44 | 137 | 83 | 139 | 195 | 63 | 167 | 33 | 97 | 107 |
| Sunny days | 22 | 15 | 16 | 6 | 11 | 3 | 4 | 4 | 7 | 24 | 15 | 13 |
| Rainy days | 9 | 13 | 15 | 24 | 20 | 27 | 27 | 27 | 23 | 7 | 15 | 18 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Roy is at