Average annual temperature is 12.2 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: -17.0 °C
Number of sunny days: 228 days
Number of rainy days: 120 days
Number of snow days: 17 days
Look at detailed online map of Union County
* Weather data for Union 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) | 18.1 | 17.9 | 21.8 | 27.1 | 28.6 | 33.5 | 35.5 | 34.1 | 33.9 | 27.5 | 24.2 | 17.5 |
| Average daytime temperature (°C) | 8.1 | 9.8 | 13.5 | 19.3 | 22.7 | 26.1 | 31.1 | 30.0 | 27.5 | 20.3 | 14.6 | 9.2 |
| Average temperature (°C) | 1.5 | 2.3 | 5.4 | 10.7 | 15.9 | 19.1 | 23.8 | 23.3 | 20.4 | 13.0 | 7.4 | 2.9 |
| Average night temperature (°C) | -2.7 | -3.0 | -0.7 | 3.7 | 9.8 | 12.9 | 17.5 | 17.0 | 14.5 | 7.3 | 2.1 | -1.7 |
| Absolute minimum temperature (°C) | -13.4 | -17.0 | -7.6 | -5.9 | 5.4 | 7.8 | 13.2 | 12.1 | 8.9 | -6.8 | -6.8 | -8.3 |
| 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 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 8.4 | 9.0 | 10.0 | 11.3 | 11.1 | 12.4 | 12.6 | 11.9 | 10.5 | 9.8 | 8.6 | 7.7 |
| Precipitation (mm) | 6 | 22 | 7 | 47 | 49 | 78 | 28 | 34 | 48 | 22 | 5 | 26 |
| Sunny days | 25 | 22 | 21 | 21 | 8 | 8 | 11 | 16 | 23 | 26 | 24 | 23 |
| Rainy days | 4 | 2 | 4 | 7 | 23 | 22 | 20 | 15 | 7 | 5 | 5 | 6 |
| Snow days | 2 | 4 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The largest precipitation sum in Union County is at