Average annual temperature is 23.2 °C
Absolute maximum temperature: 37.6 °C
Absolute minimum temperature: 1.6 °C
Number of sunny days: 146 days
Number of rainy days: 219 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) | 29.0 | 31.0 | 31.9 | 34.8 | 35.6 | 35.3 | 36.3 | 37.6 | 34.5 | 31.3 | 32.5 | 28.4 |
| Average daytime temperature (°C) | 23.1 | 26.6 | 27.7 | 29.9 | 31.4 | 31.3 | 33.2 | 34.0 | 32.1 | 28.7 | 25.9 | 22.2 |
| Average temperature (°C) | 16.9 | 20.2 | 21.4 | 23.9 | 24.9 | 26.4 | 28.3 | 28.8 | 26.6 | 23.5 | 20.2 | 17.4 |
| Average night temperature (°C) | 12.4 | 15.5 | 16.4 | 19.0 | 19.7 | 22.6 | 24.8 | 24.7 | 22.5 | 19.2 | 15.8 | 14.0 |
| Absolute minimum temperature (°C) | 1.6 | 7.5 | 6.7 | 12.8 | 15.2 | 19.7 | 23.0 | 22.8 | 19.1 | 10.8 | 6.1 | 6.6 |
| 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 | 9.6 | 10.1 | 10.4 | 12.0 | 11.3 | 10.9 | 11.2 | 10.5 | 9.6 | 7.8 | 6.9 |
| Precipitation (mm) | 62 | 15 | 51 | 73 | 126 | 152 | 215 | 171 | 137 | 60 | 32 | 88 |
| Sunny days | 22 | 20 | 16 | 11 | 10 | 5 | 1 | 1 | 7 | 20 | 15 | 18 |
| Rainy days | 9 | 8 | 15 | 19 | 21 | 25 | 30 | 30 | 23 | 11 | 15 | 13 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Prospect Heights is at