McHenry Climate: Weather by Month and Best Time to Visit
Best months for McHenry: September, July, August, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -8°C | 50 mm | 8 | – | – | 4.0 |
| February | 1°C | -6°C | 48 mm | 7 | – | – | 4.3 |
| March | 8°C | -1°C | 62 mm | 10 | – | – | 5.3 |
| April | 15°C | 4°C | 109 mm | 12 | – | – | 6.1 |
| May | 21°C | 11°C | 111 mm | 12 | – | – | 7.1 |
| June | 26°C | 16°C | 97 mm | 12 | – | – | 7.4 |
| July | 28°C | 19°C | 87 mm | 10 | – | – | 7.7 |
| August | 27°C | 18°C | 91 mm | 10 | – | – | 7.6 |
| September | 23°C | 13°C | 75 mm | 9 | – | – | 7.9 |
| October | 16°C | 7°C | 77 mm | 9 | – | – | 7.0 |
| November | 8°C | 1°C | 60 mm | 8 | – | – | 5.7 |
| December | 2°C | -5°C | 54 mm | 8 | – | – | 4.3 |