Average annual temperature is 8.2 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: -26.0 °C
Number of sunny days: 220 days
Number of rainy days: 106 days
Number of snow days: 39 days
Look at detailed online map of Jefferson Island
* Weather data for Jefferson Island 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) | 7.1 | 8.7 | 9.8 | 23.5 | 27.5 | 28.1 | 34.7 | 35.5 | 28.8 | 24.2 | 14.3 | 13.0 |
| Average daytime temperature (°C) | 1.0 | 2.8 | 2.9 | 11.6 | 21.1 | 21.4 | 29.6 | 28.4 | 22.8 | 14.9 | 9.0 | 6.0 |
| Average temperature (°C) | -3.4 | -2.9 | -2.3 | 4.5 | 14.6 | 15.6 | 22.1 | 20.9 | 15.8 | 8.3 | 3.1 | 1.3 |
| Average night temperature (°C) | -7.2 | -7.0 | -6.5 | -0.8 | 8.5 | 10.3 | 14.9 | 14.8 | 10.7 | 3.7 | -1.2 | -2.1 |
| Absolute minimum temperature (°C) | -24.5 | -26.0 | -12.5 | -7.6 | 2.1 | 3.2 | 8.5 | 9.9 | 2.7 | -9.8 | -7.6 | -8.1 |
| 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 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.4 | 11.9 | 13.5 | 14.9 | 15.7 | 15.3 | 14.1 | 12.5 | 10.9 | 9.5 | 8.7 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 6.0 | 7.4 | 8.3 | 10.6 | 12.0 | 11.3 | 13.8 | 11.3 | 10.2 | 7.9 | 6.9 | 6.2 |
| Precipitation (mm) | 12 | 16 | 35 | 28 | 36 | 88 | 6 | 38 | 42 | 27 | 8 | 9 |
| Sunny days | 23 | 18 | 13 | 15 | 11 | 10 | 23 | 21 | 21 | 18 | 23 | 24 |
| Rainy days | 3 | 1 | 4 | 8 | 20 | 20 | 8 | 10 | 9 | 12 | 7 | 4 |
| Snow days | 5 | 9 | 14 | 7 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 |
The best time to visit Jefferson Island during the most sunny months:
Months with the longest average daylight duration in Jefferson Island:
The largest precipitation sum in Jefferson Island is at