Average annual temperature is 17.9 °C
Absolute maximum temperature: 37.1 °C
Absolute minimum temperature: -2.4 °C
Number of sunny days: 188 days
Number of rainy days: 177 days
Look at detailed online map of Dekalb
* Weather data for Dekalb 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) | 21.3 | 26.5 | 28.8 | 30.5 | 33.1 | 32.7 | 37.1 | 36.4 | 33.9 | 27.6 | 26.1 | 22.0 |
| Average daytime temperature (°C) | 15.0 | 18.5 | 20.2 | 24.1 | 25.7 | 29.7 | 33.4 | 32.5 | 28.1 | 23.1 | 17.5 | 14.9 |
| Average temperature (°C) | 9.9 | 12.9 | 14.0 | 17.8 | 20.2 | 23.8 | 27.4 | 26.8 | 22.6 | 17.6 | 12.0 | 9.6 |
| Average night temperature (°C) | 5.9 | 8.6 | 8.6 | 12.1 | 15.1 | 18.9 | 22.9 | 22.1 | 18.0 | 13.0 | 7.6 | 5.6 |
| Absolute minimum temperature (°C) | -2.4 | -2.2 | -0.6 | 4.4 | 8.1 | 13.5 | 19.9 | 19.5 | 14.1 | 7.3 | -1.9 | -2.2 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.4 | 7.4 | 8.3 | 9.3 | 10.0 | 11.0 | 11.6 | 11.0 | 10.1 | 8.9 | 7.7 | 6.6 |
| Precipitation (mm) | 151 | 94 | 99 | 147 | 55 | 126 | 65 | 186 | 59 | 55 | 42 | 138 |
| Sunny days | 16 | 12 | 16 | 15 | 17 | 12 | 6 | 11 | 17 | 24 | 21 | 21 |
| Rainy days | 15 | 16 | 15 | 15 | 14 | 18 | 25 | 20 | 13 | 7 | 9 | 10 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Dekalb during the most sunny months:
The largest precipitation sum in Dekalb is at