Average annual temperature is 9.9 °C
Absolute maximum temperature: 39.1 °C
Absolute minimum temperature: -21.2 °C
Number of sunny days: 202 days
Number of rainy days: 124 days
Number of snow days: 39 days
Look at detailed online map of McHenry
* Weather data for McHenry 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) | 8.4 | 9.1 | 12.7 | 29.6 | 30.7 | 31.0 | 39.1 | 37.5 | 30.0 | 27.0 | 17.1 | 10.6 |
| Average daytime temperature (°C) | 2.5 | 4.9 | 6.0 | 14.3 | 22.9 | 24.9 | 35.0 | 31.5 | 25.3 | 17.5 | 8.5 | 5.1 |
| Average temperature (°C) | -1.8 | -1.7 | 0.5 | 7.0 | 15.8 | 17.8 | 26.5 | 23.5 | 17.4 | 10.2 | 2.5 | 0.0 |
| Average night temperature (°C) | -4.8 | -5.9 | -3.4 | 1.1 | 9.1 | 11.4 | 18.1 | 16.4 | 10.7 | 5.0 | -1.7 | -2.9 |
| Absolute minimum temperature (°C) | -21.2 | -14.3 | -8.8 | -5.2 | 1.7 | 4.7 | 13.0 | 10.0 | 4.8 | -6.2 | -14.4 | -8.2 |
| 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 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 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) | 5.3 | 7.2 | 7.4 | 10.1 | 11.9 | 12.8 | 13.3 | 11.6 | 10.8 | 8.4 | 7.2 | 6.0 |
| Precipitation (mm) | 42 | 22 | 57 | 20 | 63 | 27 | 0 | 19 | 42 | 26 | 54 | 42 |
| Sunny days | 14 | 17 | 7 | 14 | 10 | 10 | 26 | 20 | 21 | 21 | 22 | 20 |
| Rainy days | 11 | 4 | 12 | 9 | 21 | 20 | 5 | 11 | 9 | 10 | 5 | 7 |
| Snow days | 6 | 7 | 12 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 4 |
The best time to visit McHenry during the most sunny months:
The largest precipitation sum in McHenry is at