Thornhill Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from pleasant to chilly in Thornhill. Average maximum daytime temperatures range from a pleasant 19°C (66°F) in July, the warmest time of the year, to a chilly 7°C (45°F) during cooler months like January.

At night, you can expect temperatures ranging from 11°C (52°F) in July to around 1°C (34°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Thornhill has a relatively rain/snowy climate with high precipitation levels, averaging 1402 mm (55 in) of rain/snowfall annually. Year-round, Thornhill has a balanced climate with minimal variation in precipitation. The difference between the wettest month, January, with 149 mm (5.9 in), and the driest month, April, with 91 mm (3.6 in), is minimal. For more details, please visit our Thornhill Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Thornhill. While May receives considerable daily sunshine with up to 6.3 hours, January marks the darkest time of the year, where sunshine is scarce with only 1.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Thornhill.

The city experiences its highest humidity in January, reaching 87%. In May, the humidity drops to its lowest level at 68%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year