Average annual temperature is 10.4 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: -26.4 °C
Number of sunny days: 181 days
Number of rainy days: 157 days
Number of snow days: 27 days
Look at detailed online map of Town of Janesville
* Weather data for Town of Janesville 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) | 9.3 | 10.6 | 19.5 | 25.5 | 32.4 | 32.5 | 33.0 | 36.8 | 33.6 | 27.6 | 18.2 | 12.8 |
| Average daytime temperature (°C) | 1.4 | 3.4 | 6.4 | 15.2 | 22.8 | 27.7 | 28.5 | 27.8 | 24.1 | 15.8 | 8.3 | 5.4 |
| Average temperature (°C) | -2.3 | -2.0 | 1.2 | 8.9 | 15.7 | 21.1 | 22.9 | 22.1 | 19.0 | 11.6 | 3.7 | 2.0 |
| Average night temperature (°C) | -5.0 | -6.1 | -3.0 | 3.5 | 9.7 | 15.1 | 17.7 | 17.5 | 15.2 | 8.0 | 0.0 | -0.5 |
| Absolute minimum temperature (°C) | -26.4 | -22.9 | -13.5 | -2.6 | 0.5 | 7.1 | 13.0 | 10.0 | 8.2 | -2.7 | -12.2 | -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 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.6 | 7.1 | 6.4 | 8.5 | 10.9 | 12.2 | 12.4 | 11.2 | 8.7 | 7.1 | 6.7 | 4.1 |
| Precipitation (mm) | 61 | 90 | 98 | 109 | 50 | 27 | 139 | 52 | 132 | 104 | 51 | 62 |
| Sunny days | 12 | 16 | 12 | 14 | 21 | 18 | 16 | 14 | 12 | 11 | 21 | 14 |
| Rainy days | 11 | 8 | 12 | 15 | 10 | 12 | 15 | 17 | 18 | 18 | 8 | 13 |
| Snow days | 8 | 4 | 7 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 4 |
The best time to visit Town of Janesville during the most sunny months:
Months with the longest average daylight duration in Town of Janesville:
The largest precipitation sum in Town of Janesville is at