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Monthly climate in Casselman, Ontario, Canada

Last updated: March 2, 2024

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, Ontario, 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, Ontario, Canada. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 12°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 maximum 6°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, Ontario, Canada with other places around the world.

Monthly average precipitation in Casselman, Ontario, 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, Ontario, Canada. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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) 10 13 11 13 12 13 14 13 9 13 13 12

Monthly sunshine hours in Casselman, Ontario, 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, Ontario, Canada. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 114 152 234 227 283 320 350 324 278 197 150 132
Mean daily daylight hours 9h 10m 10h 24m 11h 57m 13h 32m 14h 54m 15h 35m 15h 12m 13h 59m 12h 28m 10h 53m 9h 29m 8h 46m

Solar UV radiation in Casselman, Ontario, 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, Ontario, Canada. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 5 8 9 9 9 8 7 5 3 2

Detailed Monthly Weather Insights for Casselman, Ontario, Canada

Discover in-depth weather details for every month in Casselman. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Casselman's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.