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Monthly climate in Ajax, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Ajax features a humid continental climate (Dfb).Temperatures typically range between -3 °C (28 °F) and 22 °C (71 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 27 °C (81 °F).The average annual precipitation amounts to about 1089 mm (42.9 inches) and receives 138 rainy days on the 1 mm (0.04 inches) threshold annually.Ajax enjoys an average of 2867 hours of sunshine throughout the year, and daylight varies from 8 hours 57 minutes to 15 hours 23 minutes per day.

Monthly average temperatures in Ajax, Ontario, Canada §

The warmest months in Ajax are July, August and September, with daily mean temperatures ranging from 18 to 22 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -3 to 1 °C (28 - 33 °F) throughout the day. On average each year, Ajax experiences 7 days above 25 °C (77.0 °F) and 89 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ajax, 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 9°C
(48°F)		 10°C
(49°F)		 12°C
(53°F)		 13°C
(56°F)		 20°C
(68°F)		 24°C
(75°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(81°F)		 24°C
(75°F)		 15°C
(60°F)		 12°C
(54°F)
Mean maximum 7°C
(45°F)		 7°C
(45°F)		 10°C
(50°F)		 11°C
(53°F)		 19°C
(66°F)		 22°C
(71°F)		 26°C
(79°F)		 26°C
(79°F)		 25°C
(77°F)		 21°C
(71°F)		 14°C
(57°F)		 9°C
(49°F)
Average high 0°C
(32°F)		 1°C
(33°F)		 3°C
(38°F)		 7°C
(44°F)		 11°C
(52°F)		 17°C
(64°F)		 23°C
(73°F)		 23°C
(74°F)		 20°C
(69°F)		 15°C
(59°F)		 7°C
(45°F)		 3°C
(37°F)
Daily mean -3°C
(28°F)		 -2°C
(28°F)		 1°C
(33°F)		 5°C
(41°F)		 9°C
(49°F)		 16°C
(60°F)		 21°C
(70°F)		 22°C
(71°F)		 18°C
(65°F)		 13°C
(55°F)		 5°C
(41°F)		 1°C
(33°F)
Average low -5°C
(23°F)		 -5°C
(24°F)		 -2°C
(29°F)		 3°C
(37°F)		 7°C
(46°F)		 14°C
(57°F)		 19°C
(67°F)		 20°C
(68°F)		 17°C
(62°F)		 11°C
(51°F)		 3°C
(37°F)		 -1°C
(30°F)
Mean minimum -16°C
(4°F)		 -14°C
(7°F)		 -11°C
(12°F)		 -1°C
(30°F)		 3°C
(38°F)		 10°C
(51°F)		 16°C
(62°F)		 16°C
(61°F)		 12°C
(53°F)		 5°C
(41°F)		 -7°C
(20°F)		 -10°C
(15°F)
Minimum -21°C
(-6°F)		 -18°C
(1°F)		 -13°C
(8°F)		 -4°C
(26°F)		 0°C
(33°F)		 7°C
(45°F)		 15°C
(60°F)		 15°C
(59°F)		 9°C
(49°F)		 2°C
(36°F)		 -11°C
(13°F)		 -17°C
(2°F)

Compare climate in Ajax with other places

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

Monthly average precipitation in Ajax, Ontario, Canada §

Ajax usually has the most precipitation in April, May and October, with an average of 12 rainy days and 115 mm (4.5 inches) of precipitation per month.The driest months in Ajax are June, July and September. On average, 73 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ajax, 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) 84 (3.3) 88 (3.5) 77 (3.0) 122 (4.8) 105 (4.1) 77 (3.0) 70 (2.7) 78 (3.1) 73 (2.9) 118 (4.6) 102 (4.0) 96 (3.8)
Average precipitation days (≥ 1 mm) 11 13 11 12 12 9 10 10 9 14 12 15

Monthly sunshine hours in Ajax, Ontario, Canada §

The sunniest months in Ajax are June, July and August, when the sun shines an average of 11 hours 18 minutes a day.Least sunny months in Ajax: January, February and December receive an average of 4 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ajax, 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 114 154 233 240 294 340 353 346 308 204 156 120
Mean daily daylight hours 9h 19m 10h 29m 11h 57m 13h 28m 14h 45m 15h 23m 15h 2m 13h 53m 12h 27m 10h 56m 9h 37m 8h 57m

Solar UV radiation in Ajax, Ontario, Canada §

Ajax 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 Ajax UV Index data.

Average daily maximum UV levels by month for Ajax, 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