Average annual temperature is 11.1 °C
Absolute maximum temperature: 36.9 °C
Absolute minimum temperature: -21.4 °C
Number of sunny days: 184 days
Number of rainy days: 163 days
Number of snow days: 18 days
Look at detailed online map of Glen Ellyn
* Weather data for Glen Ellyn 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) | 11.1 | 14.4 | 20.4 | 25.3 | 30.5 | 32.3 | 33.4 | 36.9 | 33.6 | 27.6 | 19.6 | 14.6 |
| Average daytime temperature (°C) | 3.1 | 5.5 | 7.8 | 16.2 | 21.6 | 27.1 | 28.1 | 27.3 | 24.1 | 16.7 | 9.5 | 6.5 |
| Average temperature (°C) | -0.6 | 0.3 | 2.7 | 9.7 | 15.3 | 20.5 | 22.6 | 22.2 | 19.2 | 12.6 | 5.0 | 3.1 |
| Average night temperature (°C) | -3.3 | -3.7 | -0.9 | 4.1 | 9.9 | 15.0 | 18.1 | 17.9 | 15.4 | 9.2 | 1.3 | 0.7 |
| Absolute minimum temperature (°C) | -21.4 | -18.8 | -11.6 | -2.7 | 1.5 | 7.7 | 14.3 | 12.1 | 9.6 | -2.9 | -10.6 | -7.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 13.0 | 14.0 | 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 | 7.7 | 6.4 | 9.2 | 10.6 | 11.7 | 11.4 | 10.5 | 8.0 | 6.4 | 7.2 | 4.0 |
| Precipitation (mm) | 58 | 88 | 81 | 90 | 60 | 47 | 276 | 113 | 118 | 97 | 35 | 74 |
| Sunny days | 11 | 17 | 11 | 15 | 19 | 19 | 12 | 16 | 12 | 14 | 22 | 16 |
| Rainy days | 11 | 9 | 16 | 15 | 12 | 11 | 19 | 15 | 18 | 16 | 7 | 14 |
| Snow days | 9 | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
The best time to visit Glen Ellyn during the most sunny months:
The largest precipitation sum in Glen Ellyn is at