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Monthly climate in Thorold, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Thorold features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 22 °C (73 °F) through the year, but rarely can drop to -19 °C (-2 °F) or can rise to as high as 30 °C (87 °F). The average annual precipitation amounts to about 1156 mm (45.5 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually. Thorold enjoys an average of 2838 hours of sunshine throughout the year, and daylight varies from 9 hours 3 minutes to 15 hours 16 minutes per day.

Monthly average temperatures in Thorold, Canada

The warmest months in Thorold are July, August and September, with daily mean temperatures ranging from 19 to 22 °C (66 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Thorold experiences 25 days above 25 °C (77.0 °F) and 80 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thorold. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(54°F)		13°C
(56°F)		13°C
(56°F)		19°C
(66°F)		25°C
(78°F)		28°C
(83°F)		30°C
(87°F)		28°C
(83°F)		28°C
(83°F)		24°C
(76°F)		17°C
(63°F)		15°C
(59°F)
Mean maximum9°C
(48°F)		9°C
(48°F)		11°C
(52°F)		16°C
(61°F)		22°C
(73°F)		25°C
(78°F)		28°C
(83°F)		27°C
(82°F)		26°C
(79°F)		23°C
(73°F)		15°C
(60°F)		11°C
(52°F)
Average high0°C
(33°F)		1°C
(34°F)		4°C
(39°F)		8°C
(47°F)		15°C
(59°F)		21°C
(70°F)		25°C
(77°F)		24°C
(76°F)		21°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
(34°F)		6°C
(43°F)		12°C
(54°F)		18°C
(65°F)		22°C
(73°F)		22°C
(72°F)		19°C
(66°F)		13°C
(56°F)		6°C
(42°F)		1°C
(35°F)
Average low-4°C
(25°F)		-4°C
(25°F)		-1°C
(30°F)		4°C
(39°F)		10°C
(50°F)		16°C
(61°F)		20°C
(69°F)		20°C
(68°F)		17°C
(62°F)		11°C
(52°F)		3°C
(38°F)		-0°C
(31°F)
Mean minimum-13°C
(9°F)		-12°C
(10°F)		-8°C
(17°F)		-1°C
(30°F)		4°C
(39°F)		11°C
(53°F)		17°C
(64°F)		16°C
(61°F)		12°C
(54°F)		5°C
(42°F)		-4°C
(25°F)		-7°C
(19°F)
Minimum-18°C
(-0°F)		-19°C
(-2°F)		-11°C
(12°F)		-3°C
(27°F)		0°C
(33°F)		9°C
(48°F)		17°C
(62°F)		15°C
(59°F)		9°C
(49°F)		3°C
(38°F)		-8°C
(19°F)		-16°C
(4°F)

Compare climate in Thorold with other places

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

Monthly average precipitation in Thorold, Canada

Thorold usually has the most precipitation in April, July and October, with an average of 14 rainy days and 125 mm (4.9 inches) of precipitation per month. The driest months in Thorold are January, March and September. On average, 79 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thorold. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)79 (3.1)85 (3.4)77 (3.0)118 (4.6)104 (4.1)84 (3.3)124 (4.9)85 (3.4)80 (3.2)133 (5.2)92 (3.6)93 (3.7)
Average precipitation days (≥ 1 mm)10131113131013129161214

Monthly sunshine hours in Thorold, Canada

The sunniest months in Thorold are June, July and August, when the sun shines an average of 11 hours 14 minutes a day. Least sunny months in Thorold: January, February and December receive an average of 4 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thorold. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours107150231240291340348344303206157115
Mean daily daylight hours9h 25m10h 32m11h 57m13h 25m14h 39m15h 16m14h 56m13h 50m12h 26m10h 59m9h 42m9h 3m

Solar UV radiation in Thorold, Canada

Thorold 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 Thorold UV Index data.

Average daily maximum UV levels by month for Thorold. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)2458910997532