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Casselman (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Casselman.
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Climate overview of Casselman
The climate in Casselman, Ontario, Canada, is marked by large temperature swings across the seasons, ranging from 28°C (82°F) in July to -4°C (25°F) in January.
The city receives considerable rain/snowfall, with around 1127 mm (44 in) annually. June is the wettest month. It has warm summers and very cold winters. The sunniest month is July, with 9.3 hours of sunshine per day on average.
Casselman Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Casselman - and find the best time to visit.
Monthly Temperature in Casselman
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
Rainfall in Casselman
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
Sunshine Hours in Casselman
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
Data from: Ottawa, Canada (49 KM, 30 Miles).
Daily hours of sunshine
Data from: Ottawa, Canada (49 KM, 30 Miles).
Daily percentage of sunshine
Data from: Ottawa, Canada (49 KM, 30 Miles).
Humidity in Casselman by Month
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
Data from: Ottawa, Canada (49 KM, 30 Miles).
Best Time to Visit Casselman
The most comfortable overall weather for exploring Casselman is usually found in May and August. Conditions are generally least comfortable in January, February, March, April, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
very cold
Mar
cold
Apr
wet
May
excellent
Jun
very good
Jul
very good
Aug
excellent
Sep
very good
Oct
mixed
Nov
cold
Dec
cold
- Best overall: May and August
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -15°C (5°F).
Frequently asked questions about the climate in Casselman
What is the best time to visit Casselman?
May and August typically offer the most optimal weather in Casselman. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Casselman has warm summers and very cold winters.
What temperatures can I expect in Casselman?
Daytime highs range from -4°C (25°F) in January to 28°C (82°F) in July. Nighttime lows range from -15°C (5°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Casselman get?
Annual rainfall is around 1127 mm (44 in). June is the wettest month with 110 mm (4.3 in), while February is the driest with 72 mm (2.8 in).
How sunny is Casselman?
Casselman receives around 2,087 hours of sunshine per year. July is the sunniest month with 280 hours, while December is the cloudiest with just 83 hours. Overall, Casselman enjoys abundant sunshine.
Casselman 3-Day Forecast
Casselman on the map
Casselman is highlighted - select any city to see its climate.
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