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Monthly climate in Perth, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Perth features a humid continental climate (Dfb).Temperatures typically range between -8 °C (18 °F) and 21 °C (71 °F) through the year, but rarely can drop to -31 °C (-23 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1059 mm (41.7 inches) and receives 143 rainy days on the 1 mm (0.04 inches) threshold annually.Perth enjoys an average of 2762 hours of sunshine throughout the year, and daylight varies from 8 hours 49 minutes to 15 hours 31 minutes per day.

Monthly average temperatures in Perth, Ontario, Canada §

The warmest months in Perth are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (64 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -4 °C (18 - 25 °F) throughout the day. On average each year, Perth experiences 49 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 Perth, 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 10°C
(51°F)		 12°C
(54°F)		 20°C
(68°F)		 26°C
(80°F)		 31°C
(88°F)		 31°C
(88°F)		 34°C
(93°F)		 32°C
(90°F)		 32°C
(89°F)		 26°C
(80°F)		 21°C
(69°F)		 14°C
(58°F)
Mean maximum 5°C
(42°F)		 8°C
(46°F)		 13°C
(56°F)		 20°C
(68°F)		 28°C
(83°F)		 30°C
(86°F)		 31°C
(89°F)		 30°C
(87°F)		 28°C
(82°F)		 24°C
(75°F)		 14°C
(58°F)		 9°C
(49°F)
Average high -4°C
(25°F)		 -2°C
(29°F)		 3°C
(37°F)		 10°C
(50°F)		 18°C
(64°F)		 23°C
(73°F)		 26°C
(80°F)		 25°C
(78°F)		 21°C
(71°F)		 14°C
(57°F)		 5°C
(41°F)		 -1°C
(30°F)
Daily mean -8°C
(18°F)		 -7°C
(20°F)		 -2°C
(29°F)		 5°C
(42°F)		 12°C
(55°F)		 18°C
(64°F)		 21°C
(71°F)		 20°C
(69°F)		 16°C
(61°F)		 10°C
(49°F)		 1°C
(35°F)		 -4°C
(25°F)
Average low -12°C
(11°F)		 -11°C
(12°F)		 -6°C
(21°F)		 1°C
(34°F)		 7°C
(45°F)		 12°C
(54°F)		 16°C
(62°F)		 16°C
(60°F)		 11°C
(53°F)		 6°C
(42°F)		 -2°C
(28°F)		 -8°C
(19°F)
Mean minimum -25°C
(-13°F)		 -24°C
(-11°F)		 -19°C
(-3°F)		 -6°C
(22°F)		 -0°C
(31°F)		 6°C
(44°F)		 11°C
(53°F)		 9°C
(49°F)		 4°C
(40°F)		 -2°C
(30°F)		 -13°C
(9°F)		 -20°C
(-4°F)
Minimum -31°C
(-23°F)		 -27°C
(-16°F)		 -21°C
(-6°F)		 -11°C
(12°F)		 -3°C
(27°F)		 2°C
(36°F)		 10°C
(50°F)		 7°C
(46°F)		 1°C
(33°F)		 -4°C
(25°F)		 -18°C
(1°F)		 -29°C
(-20°F)

Compare climate in Perth with other places

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

Monthly average precipitation in Perth, Ontario, Canada §

Perth usually has the most precipitation in April, July and October, with an average of 13 rainy days and 116 mm (4.6 inches) of precipitation per month.The driest months in Perth are January, February and September. On average, 66 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Perth, 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) 72 (2.8) 72 (2.8) 75 (2.9) 115 (4.5) 102 (4.0) 85 (3.3) 107 (4.2) 87 (3.4) 55 (2.2) 126 (5.0) 89 (3.5) 76 (3.0)
Average precipitation days (≥ 1 mm) 9 13 10 13 12 13 13 14 9 13 13 11

Monthly sunshine hours in Perth, Ontario, Canada §

The sunniest months in Perth are June, July and August, when the sun shines an average of 10 hours 45 minutes a day.Least sunny months in Perth: January, November and December receive an average of 4 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Perth, 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 113 159 234 228 280 317 350 321 278 200 150 125
Mean daily daylight hours 9h 12m 10h 25m 11h 57m 13h 31m 14h 51m 15h 31m 15h 9m 13h 58m 12h 27m 10h 54m 9h 32m 8h 49m

Solar UV radiation in Perth, Ontario, Canada §

Perth 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 Perth UV Index data.

Average daily maximum UV levels by month for Perth, 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