Casselman (ON) Weather & Climate: Best Time to Visit

In Casselman, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in July to a very cold -4°C (25°F) in the coolest month, January.

Nights vary from 15°C (59°F) in July to around -15°C (5°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Casselman experiences significant rain/snowfall throughout the year, averaging 1127 mm (44 in) of precipitation annually. Precipitation levels in Casselman remain relatively steady throughout the year. June has the most rain, with 110 mm (4.3 in) over 12 days. In the driest month February, this drops slightly to 72 mm (2.8 in), making the city's climate fairly predictable. For more details, please visit our Casselman Precipitation page.

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

The average number of days each month with precipitation

For those who appreciate different seasons, Casselman serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 9.3 hours of sunshine daily, and embrace the darker days in December, offering only 2.8 hours of daily sunlight.

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 moderate throughout the year in Casselman.

The city experiences its highest humidity in December, reaching 72%. In May, the humidity drops to its lowest level at 49%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year