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Monthly climate in Grimsby, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grimsby features a humid continental climate (Dfb).Temperatures typically range between -2 °C (29 °F) and 23 °C (73 °F) through the year, but rarely can drop to -19 °C (-2 °F) or can rise to as high as 31 °C (89 °F).The average annual precipitation amounts to about 1030 mm (40.5 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually.Grimsby enjoys an average of 2837 hours of sunshine throughout the year, and daylight varies from 9 hours 1 minutes to 15 hours 18 minutes per day.

Monthly average temperatures in Grimsby, Ontario, Canada §

The warmest months in Grimsby are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 35 °F) throughout the day. On average each year, Grimsby experiences 33 days above 25 °C (77.0 °F) and 81 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grimsby, 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)		 13°C
(56°F)		 15°C
(59°F)		 18°C
(65°F)		 25°C
(77°F)		 27°C
(81°F)		 31°C
(89°F)		 30°C
(86°F)		 30°C
(86°F)		 26°C
(79°F)		 18°C
(65°F)		 15°C
(59°F)
Mean maximum 9°C
(48°F)		 9°C
(49°F)		 13°C
(55°F)		 15°C
(60°F)		 23°C
(73°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(83°F)		 27°C
(81°F)		 23°C
(74°F)		 15°C
(59°F)		 11°C
(52°F)
Average high 0°C
(33°F)		 1°C
(34°F)		 4°C
(40°F)		 9°C
(48°F)		 14°C
(58°F)		 21°C
(70°F)		 25°C
(78°F)		 25°C
(77°F)		 22°C
(71°F)		 15°C
(60°F)		 8°C
(46°F)		 3°C
(38°F)
Daily mean -2°C
(29°F)		 -2°C
(29°F)		 1°C
(35°F)		 6°C
(43°F)		 12°C
(53°F)		 18°C
(65°F)		 23°C
(73°F)		 22°C
(72°F)		 19°C
(66°F)		 13°C
(56°F)		 5°C
(42°F)		 1°C
(35°F)
Average low -4°C
(24°F)		 -4°C
(25°F)		 -1°C
(30°F)		 3°C
(38°F)		 9°C
(48°F)		 16°C
(60°F)		 20°C
(68°F)		 20°C
(68°F)		 16°C
(62°F)		 11°C
(51°F)		 3°C
(38°F)		 -1°C
(31°F)
Mean minimum -14°C
(8°F)		 -13°C
(9°F)		 -9°C
(16°F)		 -1°C
(30°F)		 3°C
(38°F)		 11°C
(52°F)		 17°C
(63°F)		 16°C
(60°F)		 11°C
(53°F)		 4°C
(40°F)		 -5°C
(24°F)		 -7°C
(19°F)
Minimum -19°C
(-2°F)		 -19°C
(-2°F)		 -12°C
(11°F)		 -3°C
(27°F)		 0°C
(33°F)		 8°C
(47°F)		 16°C
(61°F)		 14°C
(58°F)		 9°C
(49°F)		 2°C
(37°F)		 -8°C
(18°F)		 -15°C
(5°F)

Compare climate in Grimsby with other places

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

Monthly average precipitation in Grimsby, Ontario, Canada §

Grimsby usually has the most precipitation in April, May and October, with an average of 13 rainy days and 110 mm (4.3 inches) of precipitation per month.The driest months in Grimsby are January, March and September. On average, 70 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grimsby, 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) 75 (3.0) 83 (3.3) 69 (2.7) 115 (4.5) 98 (3.9) 78 (3.1) 88 (3.5) 76 (3.0) 65 (2.6) 115 (4.5) 83 (3.3) 84 (3.3)
Average precipitation days (≥ 1 mm) 9 12 9 13 12 10 11 11 8 15 11 13

Monthly sunshine hours in Grimsby, Ontario, Canada §

The sunniest months in Grimsby are June, July and August, when the sun shines an average of 11 hours 12 minutes a day.Least sunny months in Grimsby: January, February and December receive an average of 4 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grimsby, 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 110 151 230 239 290 340 348 343 302 206 156 118
Mean daily daylight hours 9h 23m 10h 31m 11h 57m 13h 26m 14h 41m 15h 18m 14h 58m 13h 51m 12h 26m 10h 58m 9h 41m 9h 1m

Solar UV radiation in Grimsby, Ontario, Canada §

Grimsby experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, 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 Grimsby UV Index data.

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