Average annual temperature is 20.4 °C
Absolute maximum temperature: 37.2 °C
Absolute minimum temperature: 0.1 °C
Number of sunny days: 158 days
Number of rainy days: 207 days
Look at detailed online map of Jefferson County
* Weather data for Jefferson County 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) | 24.7 | 28.8 | 29.1 | 30.1 | 35.4 | 35.2 | 36.1 | 37.2 | 33.1 | 30.2 | 27.9 | 24.5 |
| Average daytime temperature (°C) | 19.5 | 22.9 | 23.5 | 26.6 | 29.1 | 30.8 | 32.4 | 34.1 | 30.4 | 26.4 | 21.2 | 17.7 |
| Average temperature (°C) | 13.7 | 16.7 | 17.7 | 20.4 | 22.8 | 25.1 | 27.0 | 28.1 | 24.6 | 20.5 | 15.6 | 12.8 |
| Average night temperature (°C) | 9.5 | 12.5 | 13.2 | 15.5 | 17.8 | 20.8 | 23.6 | 23.7 | 20.3 | 15.6 | 11.5 | 9.0 |
| Absolute minimum temperature (°C) | 0.1 | 2.3 | 1.8 | 9.5 | 12.6 | 17.6 | 21.4 | 21.9 | 16.8 | 9.2 | 2.1 | 1.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 12.9 | 13.7 | 14.1 | 13.9 | 13.2 | 12.3 | 11.4 | 10.6 | 10.2 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.4 | 8.2 | 8.9 | 9.8 | 10.7 | 10.4 | 10.7 | 11.0 | 9.7 | 9.5 | 7.1 | 6.8 |
| Precipitation (mm) | 158 | 115 | 124 | 111 | 66 | 232 | 153 | 150 | 99 | 49 | 63 | 212 |
| Sunny days | 17 | 17 | 13 | 9 | 9 | 6 | 4 | 5 | 13 | 24 | 21 | 20 |
| Rainy days | 14 | 11 | 18 | 21 | 22 | 24 | 27 | 26 | 17 | 7 | 9 | 11 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Jefferson County is at