Average annual temperature is 23.0 °C
Absolute maximum temperature: 37.3 °C
Absolute minimum temperature: 1.0 °C
Number of sunny days: 142 days
Number of rainy days: 223 days
Look at detailed online map of River Forest Reserve
* Weather data for River Forest Reserve 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) | 28.8 | 31.6 | 32.0 | 35.1 | 35.7 | 35.7 | 35.8 | 37.3 | 34.5 | 31.1 | 32.7 | 29.1 |
| Average daytime temperature (°C) | 23.0 | 27.1 | 28.0 | 30.3 | 31.6 | 31.5 | 33.3 | 33.8 | 32.2 | 28.6 | 25.6 | 22.1 |
| Average temperature (°C) | 16.6 | 20.2 | 21.3 | 23.8 | 24.7 | 26.1 | 28.0 | 28.5 | 26.4 | 23.2 | 19.9 | 17.1 |
| Average night temperature (°C) | 12.2 | 15.2 | 16.1 | 18.8 | 19.4 | 22.2 | 24.4 | 24.5 | 22.2 | 19.0 | 15.7 | 13.7 |
| Absolute minimum temperature (°C) | 1.0 | 6.9 | 6.7 | 12.7 | 14.8 | 19.7 | 22.8 | 22.7 | 18.7 | 10.7 | 6.1 | 5.9 |
| 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 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.6 | 11.2 | 12.0 | 12.8 | 13.5 | 13.9 | 13.7 | 13.1 | 12.3 | 11.5 | 10.8 | 10.4 |
| 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) | 8.6 | 9.5 | 10.1 | 10.2 | 11.8 | 11.2 | 10.9 | 11.1 | 10.4 | 9.4 | 7.6 | 7.1 |
| Precipitation (mm) | 57 | 18 | 47 | 96 | 161 | 221 | 195 | 159 | 125 | 55 | 40 | 96 |
| Sunny days | 19 | 18 | 14 | 12 | 11 | 4 | 2 | 3 | 7 | 20 | 15 | 17 |
| Rainy days | 12 | 10 | 17 | 18 | 20 | 26 | 29 | 28 | 23 | 11 | 15 | 14 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in River Forest Reserve is at