Average annual temperature is 10.9 °C
Absolute maximum temperature: 37.5 °C
Absolute minimum temperature: -23.7 °C
Number of sunny days: 180 days
Number of rainy days: 169 days
Number of snow days: 16 days
Look at detailed online map of Prospect Heights
* Weather data for Prospect Heights 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) | 11.5 | 15.1 | 20.7 | 26.7 | 32.0 | 33.3 | 33.4 | 37.5 | 34.3 | 28.3 | 19.8 | 14.4 |
| Average daytime temperature (°C) | 3.2 | 5.4 | 7.4 | 16.1 | 21.2 | 26.3 | 28.0 | 26.9 | 23.9 | 16.9 | 9.7 | 6.4 |
| Average temperature (°C) | -0.7 | 0.0 | 2.5 | 9.5 | 14.7 | 19.7 | 22.5 | 22.0 | 19.1 | 12.5 | 4.9 | 3.1 |
| Average night temperature (°C) | -3.6 | -4.1 | -1.0 | 4.0 | 9.3 | 14.4 | 17.9 | 17.9 | 15.2 | 9.1 | 1.0 | 0.7 |
| Absolute minimum temperature (°C) | -23.7 | -19.9 | -11.4 | -3.2 | 1.3 | 7.5 | 14.0 | 12.2 | 9.7 | -3.1 | -10.7 | -7.8 |
| 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) | 3.3 | 7.8 | 6.5 | 9.1 | 10.7 | 11.9 | 11.7 | 10.4 | 7.9 | 6.2 | 6.9 | 3.7 |
| Precipitation (mm) | 56 | 100 | 84 | 65 | 50 | 46 | 217 | 99 | 100 | 98 | 39 | 74 |
| Sunny days | 12 | 18 | 8 | 14 | 22 | 20 | 10 | 14 | 12 | 13 | 22 | 15 |
| Rainy days | 12 | 8 | 20 | 16 | 9 | 10 | 21 | 17 | 18 | 17 | 6 | 15 |
| Snow days | 7 | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 1 |
The best time to visit Prospect Heights during the most sunny months:
The largest precipitation sum in Prospect Heights is at