Average annual temperature is 13.6 °C
Absolute maximum temperature: 33.3 °C
Absolute minimum temperature: -6.9 °C
Number of sunny days: 183 days
Number of rainy days: 181 days
Number of snow days: 1 day
Look at detailed online map of Glenn Brook
* Weather data for Glenn 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) | 19.8 | 24.3 | 24.0 | 24.8 | 27.3 | 30.1 | 32.5 | 33.3 | 32.1 | 25.9 | 25.3 | 18.6 |
| Average daytime temperature (°C) | 11.6 | 14.1 | 15.3 | 19.3 | 21.6 | 25.4 | 29.9 | 29.3 | 25.6 | 20.6 | 14.5 | 11.5 |
| Average temperature (°C) | 5.8 | 8.7 | 9.0 | 12.7 | 15.9 | 19.0 | 23.3 | 22.6 | 19.1 | 13.7 | 7.9 | 5.4 |
| Average night temperature (°C) | 1.8 | 4.3 | 3.8 | 6.7 | 11.0 | 13.2 | 17.2 | 17.0 | 13.5 | 8.2 | 2.8 | 0.9 |
| Absolute minimum temperature (°C) | -5.6 | -6.9 | -5.8 | -0.8 | 2.7 | 8.1 | 12.7 | 12.4 | 7.5 | 2.0 | -5.5 | -5.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.4 | 6.2 | 8.5 | 8.8 | 10.0 | 10.8 | 12.0 | 10.7 | 10.6 | 9.7 | 7.7 | 6.6 |
| Precipitation (mm) | 144 | 86 | 91 | 136 | 49 | 109 | 42 | 91 | 24 | 14 | 25 | 106 |
| Sunny days | 16 | 11 | 18 | 14 | 9 | 11 | 10 | 12 | 19 | 22 | 22 | 19 |
| Rainy days | 14 | 17 | 13 | 16 | 22 | 19 | 21 | 19 | 11 | 9 | 8 | 12 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Glenn Brook during the most sunny months:
The largest precipitation sum in Glenn Brook is at