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Monthly climate in Casselman, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Casselman features a humid continental climate (Dfb). Temperatures typically range between -8 °C (18 °F) and 22 °C (72 °F) through the year, but rarely can drop to -32 °C (-26 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1193 mm (47.0 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually. Casselman enjoys an average of 2767 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 35 minutes per day.

Monthly average temperatures in Casselman, Canada

The warmest months in Casselman are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -5 °C (18 - 24 °F) throughout the day. On average each year, Casselman experiences 59 days above 25 °C (77.0 °F) and 137 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Casselman. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(54°F)		13°C
(55°F)		21°C
(71°F)		27°C
(80°F)		35°C
(96°F)		34°C
(93°F)		36°C
(97°F)		33°C
(91°F)		32°C
(90°F)		27°C
(81°F)		23°C
(73°F)		15°C
(60°F)
Mean maximum6°C
(43°F)		9°C
(48°F)		13°C
(56°F)		22°C
(72°F)		31°C
(87°F)		31°C
(88°F)		33°C
(91°F)		31°C
(87°F)		29°C
(85°F)		24°C
(75°F)		16°C
(61°F)		11°C
(51°F)
Average high-4°C
(25°F)		-2°C
(29°F)		3°C
(38°F)		11°C
(52°F)		19°C
(67°F)		24°C
(76°F)		27°C
(81°F)		26°C
(79°F)		22°C
(71°F)		14°C
(58°F)		5°C
(41°F)		-1°C
(30°F)
Daily mean-8°C
(18°F)		-7°C
(20°F)		-2°C
(29°F)		6°C
(43°F)		14°C
(57°F)		19°C
(66°F)		22°C
(72°F)		21°C
(69°F)		16°C
(61°F)		10°C
(50°F)		1°C
(34°F)		-5°C
(24°F)
Average low-13°C
(9°F)		-12°C
(11°F)		-6°C
(21°F)		2°C
(35°F)		8°C
(46°F)		13°C
(55°F)		16°C
(62°F)		16°C
(60°F)		11°C
(52°F)		6°C
(42°F)		-3°C
(27°F)		-8°C
(18°F)
Mean minimum-27°C
(-16°F)		-24°C
(-12°F)		-20°C
(-3°F)		-6°C
(22°F)		-0°C
(32°F)		7°C
(44°F)		10°C
(51°F)		9°C
(48°F)		4°C
(39°F)		-3°C
(28°F)		-14°C
(6°F)		-21°C
(-6°F)
Minimum-32°C
(-26°F)		-29°C
(-19°F)		-22°C
(-7°F)		-10°C
(14°F)		-3°C
(27°F)		2°C
(36°F)		8°C
(47°F)		8°C
(46°F)		-0°C
(31°F)		-5°C
(24°F)		-20°C
(-4°F)		-29°C
(-20°F)

Compare climate in Casselman with other places

Compare temperature, precipitation, sunshine, UV index in Casselman, Canada with other places around the world.

Monthly average precipitation in Casselman, Canada

Casselman usually has the most precipitation in April, July and October, with an average of 13 rainy days and 123 mm (4.8 inches) of precipitation per month. The driest months in Casselman are January, February and September. On average, 80 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Casselman. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)81 (3.2)83 (3.3)90 (3.5)118 (4.6)113 (4.4)101 (4.0)118 (4.6)97 (3.8)75 (2.9)134 (5.3)101 (4.0)84 (3.3)
Average precipitation days (≥ 1 mm)10131113121314139131312

Monthly sunshine hours in Casselman, Canada

The sunniest months in Casselman are June, July and August, when the sun shines an average of 10 hours 48 minutes a day. Least sunny months in Casselman: January, November and December receive an average of 4 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Casselman. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours114152234227283320350324278197150132
Mean daily daylight hours9h 10m10h 24m11h 57m13h 32m14h 54m15h 35m15h 12m13h 59m12h 28m10h 53m9h 29m8h 46m

Solar UV radiation in Casselman, Canada

Casselman experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Casselman UV Index data.

Average daily maximum UV levels by month for Casselman. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)245899987532