Average annual temperature is 21.9 °C
Absolute maximum temperature: 41.0 °C
Absolute minimum temperature: 1.6 °C
Number of sunny days: 126 days
Number of rainy days: 239 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) | 24.2 | 27.2 | 29.1 | 28.7 | 31.5 | 34.4 | 37.2 | 41.0 | 37.4 | 33.0 | 28.0 | 25.4 |
| Average daytime temperature (°C) | 19.3 | 20.0 | 23.3 | 24.3 | 28.3 | 32.3 | 33.6 | 36.3 | 33.0 | 27.1 | 20.8 | 18.6 |
| Average temperature (°C) | 15.0 | 15.3 | 18.9 | 20.0 | 24.0 | 27.9 | 29.5 | 31.1 | 28.1 | 22.4 | 16.3 | 13.7 |
| Average night temperature (°C) | 11.6 | 11.7 | 15.4 | 16.4 | 20.1 | 24.2 | 26.0 | 27.0 | 24.3 | 18.8 | 12.9 | 10.0 |
| Absolute minimum temperature (°C) | 1.6 | 2.8 | 3.8 | 9.6 | 14.1 | 19.8 | 23.5 | 23.9 | 21.2 | 9.3 | 5.3 | 1.7 |
| 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 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.1 | 12.0 | 12.9 | 13.7 | 14.0 | 13.8 | 13.2 | 12.3 | 11.4 | 10.7 | 10.3 |
| 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) | 6.6 | 8.1 | 8.4 | 8.9 | 9.8 | 11.5 | 12.4 | 12.2 | 10.5 | 8.5 | 7.1 | 7.9 |
| Precipitation (mm) | 279 | 69 | 83 | 176 | 155 | 53 | 54 | 8 | 69 | 58 | 73 | 175 |
| Sunny days | 10 | 8 | 10 | 4 | 9 | 9 | 6 | 9 | 9 | 15 | 18 | 19 |
| Rainy days | 21 | 20 | 21 | 26 | 22 | 21 | 25 | 22 | 21 | 16 | 12 | 12 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Jefferson County during the most sunny months:
The largest precipitation sum in Jefferson County is at