Thornhill Climate: Weather by Month and Best Time to Visit
Best months for Thornhill: August, September, July, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -8°C | 60 mm | 10 | – | – | 3.8 |
| February | 0°C | -8°C | 49 mm | 8 | – | – | 4.0 |
| March | 5°C | -4°C | 57 mm | 9 | – | – | 4.7 |
| April | 12°C | 2°C | 77 mm | 11 | – | – | 6.0 |
| May | 18°C | 8°C | 73 mm | 10 | – | – | 7.1 |
| June | 23°C | 14°C | 78 mm | 11 | – | – | 7.7 |
| July | 26°C | 17°C | 70 mm | 10 | – | – | 7.8 |
| August | 26°C | 16°C | 66 mm | 9 | – | – | 7.9 |
| September | 22°C | 12°C | 69 mm | 9 | – | – | 7.9 |
| October | 14°C | 6°C | 75 mm | 10 | – | – | 6.5 |
| November | 8°C | 1°C | 66 mm | 10 | – | – | 5.3 |
| December | 2°C | -4°C | 61 mm | 10 | – | – | 4.1 |