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Monthly climate in Grand Falls-Windsor, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Grand Falls-Windsor features a humid continental climate (Dfb). Temperatures typically range between -7 °C (20 °F) and 18 °C (64 °F) through the year, but rarely can drop to -25 °C (-12 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 1181 mm (46.5 inches) and receives 157 rainy days on the 1 mm (0.04 inches) threshold annually. Grand Falls-Windsor enjoys an average of 2374 hours of sunshine throughout the year, and daylight varies from 8 hours 17 minutes to 16 hours 6 minutes per day.

Monthly average temperatures in Grand Falls-Windsor, Canada

The warmest months in Grand Falls-Windsor are June, July and August, with daily mean temperatures ranging from 13 to 18 °C (55 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -7 to -3 °C (20 - 26 °F) throughout the day. On average each year, Grand Falls-Windsor experiences 21 days above 25 °C (77.0 °F) and 162 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grand Falls-Windsor. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		9°C
(49°F)		14°C
(57°F)		21°C
(69°F)		29°C
(84°F)		32°C
(90°F)		31°C
(88°F)		31°C
(88°F)		26°C
(80°F)		25°C
(77°F)		18°C
(65°F)		14°C
(57°F)
Mean maximum8°C
(47°F)		7°C
(45°F)		9°C
(49°F)		17°C
(62°F)		24°C
(75°F)		26°C
(79°F)		30°C
(86°F)		30°C
(86°F)		26°C
(78°F)		20°C
(68°F)		16°C
(60°F)		11°C
(52°F)
Average high-2°C
(29°F)		-2°C
(29°F)		1°C
(34°F)		6°C
(44°F)		12°C
(54°F)		18°C
(65°F)		22°C
(73°F)		23°C
(74°F)		17°C
(64°F)		11°C
(52°F)		6°C
(42°F)		1°C
(33°F)
Daily mean-6°C
(22°F)		-7°C
(20°F)		-3°C
(26°F)		2°C
(36°F)		6°C
(44°F)		13°C
(55°F)		17°C
(62°F)		18°C
(64°F)		13°C
(55°F)		7°C
(45°F)		2°C
(36°F)		-2°C
(28°F)
Average low-10°C
(14°F)		-12°C
(11°F)		-8°C
(18°F)		-2°C
(28°F)		1°C
(35°F)		7°C
(45°F)		11°C
(53°F)		12°C
(55°F)		8°C
(46°F)		3°C
(38°F)		-1°C
(30°F)		-6°C
(22°F)
Mean minimum-19°C
(-2°F)		-22°C
(-7°F)		-17°C
(2°F)		-12°C
(11°F)		-3°C
(27°F)		1°C
(34°F)		5°C
(40°F)		6°C
(43°F)		1°C
(33°F)		-3°C
(28°F)		-7°C
(19°F)		-15°C
(5°F)
Minimum-22°C
(-7°F)		-25°C
(-12°F)		-19°C
(-2°F)		-16°C
(4°F)		-7°C
(19°F)		-2°C
(29°F)		3°C
(38°F)		4°C
(40°F)		-3°C
(27°F)		-3°C
(26°F)		-11°C
(12°F)		-19°C
(-1°F)

Compare climate in Grand Falls-Windsor with other places

Compare temperature, precipitation, sunshine, UV index in Grand Falls-Windsor, Canada with other places around the world.

Monthly average precipitation in Grand Falls-Windsor, Canada

Grand Falls-Windsor usually has the most precipitation in March, April and December, with an average of 14 rainy days and 117 mm (4.6 inches) of precipitation per month. The driest months in Grand Falls-Windsor are January, July and August. On average, 79 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grand Falls-Windsor. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)85 (3.3)94 (3.7)114 (4.5)119 (4.7)103 (4.1)101 (4.0)72 (2.8)79 (3.1)100 (3.9)90 (3.5)107 (4.2)118 (4.6)
Average precipitation days (≥ 1 mm)111215131513111112141416

Monthly sunshine hours in Grand Falls-Windsor, Canada

The sunniest months in Grand Falls-Windsor are June, July and August, when the sun shines an average of 9 hours 55 minutes a day. Least sunny months in Grand Falls-Windsor: January, November and December receive an average of 3 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grand Falls-Windsor. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours8313718921222427632730923018111784
Mean daily daylight hours8h 45m10h 10m11h 56m13h 44m15h 18m16h 6m15h 40m14h 16m12h 31m10h 43m9h 8m8h 17m

Solar UV radiation in Grand Falls-Windsor, Canada

Grand Falls-Windsor experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 8 - 10, which corresponds to the Very High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Grand Falls-Windsor UV Index data.

Average daily maximum UV levels by month for Grand Falls-Windsor. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)2356810876421