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Monthly climate in Alliston, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Alliston features a humid continental climate (Dfb).Temperatures typically range between -6 °C (21 °F) and 21 °C (71 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 972 mm (38.3 inches) and receives 140 rainy days on the 1 mm (0.04 inches) threshold annually.Alliston enjoys an average of 2716 hours of sunshine throughout the year, and daylight varies from 8 hours 54 minutes to 15 hours 25 minutes per day.

Monthly average temperatures in Alliston, Ontario, Canada §

The warmest months in Alliston are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -3 °C (21 - 28 °F) throughout the day. On average each year, Alliston experiences 51 days above 25 °C (77.0 °F) and 136 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Alliston, 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
(53°F)		 15°C
(59°F)		 21°C
(71°F)		 25°C
(78°F)		 32°C
(90°F)		 34°C
(93°F)		 36°C
(96°F)		 33°C
(92°F)		 32°C
(90°F)		 28°C
(83°F)		 24°C
(75°F)		 17°C
(63°F)
Mean maximum 7°C
(44°F)		 11°C
(51°F)		 17°C
(62°F)		 21°C
(70°F)		 30°C
(87°F)		 32°C
(90°F)		 33°C
(91°F)		 31°C
(88°F)		 29°C
(85°F)		 26°C
(79°F)		 16°C
(62°F)		 11°C
(52°F)
Average high -2°C
(28°F)		 -1°C
(31°F)		 4°C
(40°F)		 10°C
(51°F)		 18°C
(65°F)		 23°C
(75°F)		 26°C
(80°F)		 25°C
(78°F)		 22°C
(71°F)		 14°C
(58°F)		 6°C
(42°F)		 1°C
(33°F)
Daily mean -6°C
(21°F)		 -5°C
(23°F)		 -1°C
(31°F)		 5°C
(42°F)		 13°C
(55°F)		 18°C
(65°F)		 21°C
(71°F)		 20°C
(69°F)		 16°C
(61°F)		 10°C
(50°F)		 2°C
(36°F)		 -3°C
(28°F)
Average low -10°C
(14°F)		 -10°C
(15°F)		 -5°C
(23°F)		 1°C
(34°F)		 7°C
(46°F)		 13°C
(55°F)		 16°C
(61°F)		 15°C
(60°F)		 11°C
(52°F)		 6°C
(43°F)		 -2°C
(29°F)		 -6°C
(22°F)
Mean minimum -23°C
(-9°F)		 -21°C
(-6°F)		 -17°C
(2°F)		 -6°C
(22°F)		 -0°C
(32°F)		 8°C
(46°F)		 11°C
(52°F)		 9°C
(49°F)		 4°C
(40°F)		 -2°C
(29°F)		 -14°C
(7°F)		 -18°C
(-0°F)
Minimum -30°C
(-22°F)		 -26°C
(-15°F)		 -19°C
(-3°F)		 -9°C
(16°F)		 -3°C
(27°F)		 4°C
(39°F)		 9°C
(48°F)		 7°C
(44°F)		 0°C
(33°F)		 -3°C
(27°F)		 -20°C
(-4°F)		 -29°C
(-20°F)

Compare climate in Alliston with other places

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

Monthly average precipitation in Alliston, Ontario, Canada §

Alliston usually has the most precipitation in April, May and October, with an average of 13 rainy days and 100 mm (3.9 inches) of precipitation per month.The driest months in Alliston are January, February and March. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Alliston, 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) 59 (2.3) 62 (2.5) 58 (2.3) 102 (4.0) 99 (3.9) 94 (3.7) 90 (3.5) 96 (3.8) 68 (2.7) 98 (3.9) 76 (3.0) 69 (2.7)
Average precipitation days (≥ 1 mm) 9 12 10 13 13 10 12 13 9 14 12 13

Monthly sunshine hours in Alliston, Ontario, Canada §

The sunniest months in Alliston are June, July and August, when the sun shines an average of 10 hours 53 minutes a day.Least sunny months in Alliston: January, November and December receive an average of 3 hours 50 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Alliston, 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 103 149 223 222 286 322 346 332 290 190 142 106
Mean daily daylight hours 9h 17m 10h 28m 11h 57m 13h 29m 14h 47m 15h 25m 15h 4m 13h 55m 12h 27m 10h 56m 9h 36m 8h 54m

Solar UV radiation in Alliston, Ontario, Canada §

Alliston experiences the highest level of ultraviolet (UV) radiation in May, July and August, 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 Alliston UV Index data.

Average daily maximum UV levels by month for Alliston, 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 9 7 5 3 2