Average annual temperature is 9.5 °C
Absolute maximum temperature: 30.2 °C
Absolute minimum temperature: -15.1 °C
Number of sunny days: 128 days
Number of rainy days: 202 days
Number of snow days: 35 days
Look at detailed online map of Willow Brook
* Weather data for Willow Brook 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) | 12.7 | 15.9 | 12.8 | 26.8 | 28.8 | 29.5 | 30.2 | 29.3 | 29.6 | 26.2 | 15.7 | 13.1 |
| Average daytime temperature (°C) | 3.6 | 6.3 | 5.1 | 15.3 | 19.0 | 22.6 | 25.4 | 23.3 | 21.2 | 15.0 | 7.6 | 5.9 |
| Average temperature (°C) | 0.2 | -0.1 | 0.5 | 8.5 | 12.5 | 17.5 | 20.7 | 18.9 | 16.7 | 11.2 | 3.8 | 2.8 |
| Average night temperature (°C) | -2.4 | -4.4 | -2.7 | 3.4 | 6.9 | 13.0 | 16.8 | 15.5 | 13.3 | 8.5 | 0.8 | 0.5 |
| Absolute minimum temperature (°C) | -9.9 | -15.1 | -8.6 | -5.2 | 1.1 | 9.0 | 12.9 | 11.3 | 8.3 | 1.4 | -8.2 | -5.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 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) | 2.2 | 5.6 | 5.5 | 8.2 | 10.9 | 10.9 | 11.5 | 10.3 | 8.7 | 5.8 | 5.4 | 3.3 |
| Precipitation (mm) | 137 | 82 | 124 | 101 | 45 | 94 | 109 | 235 | 43 | 97 | 77 | 97 |
| Sunny days | 5 | 8 | 9 | 11 | 21 | 10 | 7 | 5 | 15 | 13 | 13 | 11 |
| Rainy days | 15 | 13 | 13 | 19 | 10 | 20 | 24 | 26 | 15 | 18 | 13 | 16 |
| Snow days | 11 | 7 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 4 |
The best time to visit Willow Brook during the most sunny months:
The largest precipitation sum in Willow Brook is at