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Monthly climate in London, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification London features a humid continental climate (Dfb).Temperatures typically range between -4 °C (25 °F) and 22 °C (72 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1122 mm (44.2 inches) and receives 152 rainy days on the 1 mm (0.04 inches) threshold annually.London enjoys an average of 2780 hours of sunshine throughout the year, and daylight varies from 9 hours 2 minutes to 15 hours 17 minutes per day.

Monthly average temperatures in London, Ontario, Canada §

The warmest months in London are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (67 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (25 - 31 °F) throughout the day. On average each year, London experiences 57 days above 25 °C (77.0 °F) and 120 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in London, 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 11°C
(53°F)		 17°C
(64°F)		 20°C
(68°F)		 26°C
(79°F)		 32°C
(89°F)		 31°C
(89°F)		 34°C
(93°F)		 31°C
(89°F)		 32°C
(90°F)		 28°C
(83°F)		 22°C
(72°F)		 16°C
(60°F)
Mean maximum 9°C
(48°F)		 11°C
(53°F)		 18°C
(64°F)		 22°C
(73°F)		 29°C
(85°F)		 31°C
(87°F)		 32°C
(89°F)		 30°C
(86°F)		 29°C
(85°F)		 26°C
(79°F)		 16°C
(61°F)		 12°C
(54°F)
Average high -1°C
(31°F)		 1°C
(34°F)		 6°C
(43°F)		 11°C
(53°F)		 19°C
(66°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(78°F)		 22°C
(73°F)		 15°C
(60°F)		 7°C
(44°F)		 2°C
(36°F)
Daily mean -4°C
(25°F)		 -3°C
(26°F)		 1°C
(34°F)		 7°C
(44°F)		 14°C
(57°F)		 19°C
(67°F)		 22°C
(72°F)		 21°C
(70°F)		 17°C
(64°F)		 11°C
(53°F)		 3°C
(38°F)		 -0°C
(31°F)
Average low -7°C
(19°F)		 -7°C
(19°F)		 -3°C
(27°F)		 2°C
(36°F)		 9°C
(48°F)		 14°C
(58°F)		 17°C
(63°F)		 16°C
(61°F)		 13°C
(55°F)		 7°C
(45°F)		 -0°C
(32°F)		 -3°C
(26°F)
Mean minimum -20°C
(-3°F)		 -18°C
(0°F)		 -12°C
(11°F)		 -5°C
(23°F)		 -1°C
(31°F)		 9°C
(48°F)		 11°C
(52°F)		 9°C
(48°F)		 5°C
(41°F)		 -1°C
(30°F)		 -8°C
(17°F)		 -11°C
(12°F)
Minimum -25°C
(-13°F)		 -24°C
(-10°F)		 -19°C
(-2°F)		 -10°C
(15°F)		 -3°C
(27°F)		 5°C
(41°F)		 9°C
(48°F)		 6°C
(43°F)		 1°C
(34°F)		 -2°C
(29°F)		 -11°C
(12°F)		 -20°C
(-3°F)

Compare climate in London with other places

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

Monthly average precipitation in London, Ontario, Canada §

London usually has the most precipitation in June, August and October, with an average of 13 rainy days and 112 mm (4.4 inches) of precipitation per month.The driest months in London are January, February and December. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in London, 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) 74 (2.9) 78 (3.1) 78 (3.1) 105 (4.1) 104 (4.1) 105 (4.1) 97 (3.8) 108 (4.2) 86 (3.4) 124 (4.9) 91 (3.6) 72 (2.8)
Average precipitation days (≥ 1 mm) 11 13 11 15 13 12 13 12 11 15 13 13

Monthly sunshine hours in London, Ontario, Canada §

The sunniest months in London are June, July and August, when the sun shines an average of 11 hours 6 minutes a day.Least sunny months in London: January, November and December receive an average of 3 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in London, 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 94 144 229 240 293 336 350 335 292 207 143 112
Mean daily daylight hours 9h 24m 10h 32m 11h 57m 13h 25m 14h 40m 15h 17m 14h 57m 13h 50m 12h 26m 10h 58m 9h 42m 9h 2m

Solar UV radiation in London, Ontario, Canada §

London experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly London UV Index data.

Average daily maximum UV levels by month for London, 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 10 10 9 8 5 4 2