Average annual temperature is 9.4 °C
Absolute maximum temperature: 37.2 °C
Absolute minimum temperature: -14.9 °C
Number of sunny days: 179 days
Number of rainy days: 150 days
Number of snow days: 36 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) | 10.7 | 10.1 | 10.4 | 27.2 | 28.1 | 29.8 | 34.4 | 37.2 | 29.6 | 25.3 | 14.6 | 10.8 |
| Average daytime temperature (°C) | 4.0 | 4.9 | 4.9 | 12.9 | 21.7 | 23.6 | 30.6 | 28.7 | 22.9 | 16.5 | 9.0 | 4.8 |
| Average temperature (°C) | 0.3 | -0.2 | 0.2 | 6.3 | 14.4 | 16.7 | 22.5 | 21.1 | 15.1 | 10.2 | 4.3 | 1.7 |
| Average night temperature (°C) | -2.4 | -3.7 | -4.3 | 1.6 | 8.3 | 10.6 | 14.5 | 14.6 | 9.6 | 5.8 | 1.1 | -1.2 |
| Absolute minimum temperature (°C) | -14.9 | -11.0 | -10.3 | -6.8 | 3.5 | 3.1 | 10.7 | 9.9 | 3.2 | -4.4 | -7.1 | -7.3 |
| 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) | 9.2 | 10.4 | 11.9 | 13.5 | 14.9 | 15.6 | 15.3 | 14.1 | 12.5 | 11.0 | 9.5 | 8.8 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 4.3 | 5.5 | 6.7 | 8.1 | 12.0 | 12.3 | 13.8 | 10.8 | 9.2 | 7.7 | 5.9 | 4.3 |
| Precipitation (mm) | 64 | 45 | 112 | 109 | 43 | 31 | 0 | 94 | 64 | 72 | 91 | 107 |
| Sunny days | 11 | 9 | 5 | 9 | 17 | 16 | 31 | 19 | 17 | 20 | 16 | 9 |
| Rainy days | 15 | 10 | 13 | 17 | 14 | 14 | 0 | 12 | 13 | 11 | 13 | 18 |
| Snow days | 5 | 9 | 13 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
The best time to visit Union County during the most sunny months:
Months with the longest average daylight duration in Union County:
The largest precipitation sum in Union County is at