Average annual temperature is 12.8 °C
Absolute maximum temperature: 34.4 °C
Absolute minimum temperature: -10.9 °C
Number of sunny days: 181 days
Number of rainy days: 175 days
Number of snow days: 9 days
Look at detailed online map of Glendale Heights
* Weather data for Glendale 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) | 17.5 | 19.9 | 21.0 | 27.5 | 30.4 | 32.1 | 34.4 | 33.7 | 31.7 | 29.1 | 24.6 | 15.4 |
| Average daytime temperature (°C) | 6.1 | 10.2 | 11.0 | 18.3 | 23.5 | 27.9 | 29.5 | 27.9 | 25.4 | 19.1 | 12.3 | 8.5 |
| Average temperature (°C) | 2.5 | 4.0 | 5.1 | 11.4 | 17.3 | 21.7 | 24.0 | 22.8 | 19.9 | 13.9 | 6.6 | 4.4 |
| Average night temperature (°C) | -0.4 | -0.2 | 0.7 | 5.9 | 11.5 | 16.0 | 19.1 | 18.0 | 14.9 | 9.8 | 2.4 | 1.2 |
| Absolute minimum temperature (°C) | -10.0 | -10.9 | -7.6 | -1.2 | 2.5 | 10.7 | 15.2 | 12.2 | 9.9 | -3.1 | -8.7 | -6.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.7 | 7.3 | 6.7 | 8.7 | 10.6 | 11.1 | 12.3 | 10.7 | 9.7 | 7.2 | 7.8 | 4.3 |
| Precipitation (mm) | 139 | 80 | 187 | 88 | 58 | 48 | 107 | 81 | 44 | 89 | 28 | 49 |
| Sunny days | 9 | 16 | 17 | 16 | 16 | 16 | 7 | 15 | 18 | 15 | 24 | 12 |
| Rainy days | 16 | 11 | 13 | 14 | 15 | 14 | 24 | 16 | 12 | 16 | 6 | 18 |
| Snow days | 6 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Glendale Heights during the most sunny months:
The largest precipitation sum in Glendale Heights is at