Average annual temperature is 11.4 °C
Absolute maximum temperature: 35.2 °C
Absolute minimum temperature: -22.6 °C
Number of sunny days: 158 days
Number of rainy days: 197 days
Number of snow days: 10 days
Look at detailed online map of Forest Park
* Weather data for Forest Park 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) | 12.9 | 15.3 | 16.2 | 33.0 | 29.7 | 33.6 | 32.5 | 29.8 | 35.2 | 27.5 | 19.3 | 16.5 |
| Average daytime temperature (°C) | 6.3 | 6.4 | 9.1 | 17.7 | 21.6 | 25.2 | 29.1 | 26.3 | 23.7 | 18.7 | 9.5 | 7.8 |
| Average temperature (°C) | 2.4 | 1.0 | 3.6 | 10.9 | 14.8 | 19.1 | 23.6 | 21.1 | 18.5 | 13.5 | 4.3 | 3.4 |
| Average night temperature (°C) | -0.8 | -3.5 | -0.9 | 5.7 | 8.2 | 14.0 | 19.2 | 16.9 | 14.8 | 9.5 | 0.3 | 0.2 |
| Absolute minimum temperature (°C) | -6.0 | -22.6 | -7.1 | -3.2 | 2.3 | 7.8 | 14.2 | 12.3 | 7.1 | 3.1 | -5.0 | -6.4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 13.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.8 | 12.5 | 11.1 | 9.8 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.1 | 6.4 | 7.4 | 8.3 | 11.7 | 10.1 | 10.4 | 9.5 | 7.4 | 7.6 | 7.0 | 4.8 |
| Precipitation (mm) | 145 | 47 | 109 | 105 | 76 | 92 | 227 | 134 | 238 | 82 | 40 | 189 |
| Sunny days | 10 | 10 | 14 | 15 | 21 | 8 | 4 | 11 | 13 | 14 | 22 | 16 |
| Rainy days | 18 | 13 | 17 | 15 | 10 | 22 | 27 | 20 | 17 | 17 | 8 | 13 |
| Snow days | 3 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The best time to visit Forest Park during the most sunny months:
The largest precipitation sum in Forest Park is at