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Monthly climate in Rock Island, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rock Island features a humid continental climate (Dfb). Temperatures typically range between -8 °C (17 °F) and 20 °C (67 °F) through the year, but rarely can drop to -31 °C (-23 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 1234 mm (48.6 inches) and receives 170 rainy days on the 1 mm (0.04 inches) threshold annually. Rock Island enjoys an average of 2656 hours of sunshine throughout the year, and daylight varies from 8 hours 48 minutes to 15 hours 32 minutes per day.

Monthly average temperatures in Rock Island, Canada

The warmest months in Rock Island are June, July and August, with daily mean temperatures ranging from 17 to 20 °C (62 - 67 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -5 °C (17 - 23 °F) throughout the day. On average each year, Rock Island experiences 30 days above 25 °C (77.0 °F) and 146 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rock Island. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum11°C
(52°F)		15°C
(59°F)		20°C
(69°F)		24°C
(76°F)		32°C
(89°F)		31°C
(89°F)		32°C
(90°F)		32°C
(89°F)		29°C
(85°F)		25°C
(77°F)		22°C
(72°F)		14°C
(58°F)
Mean maximum6°C
(44°F)		9°C
(48°F)		13°C
(56°F)		20°C
(69°F)		28°C
(83°F)		28°C
(83°F)		29°C
(85°F)		30°C
(85°F)		27°C
(80°F)		22°C
(72°F)		16°C
(60°F)		10°C
(50°F)
Average high-4°C
(24°F)		-2°C
(28°F)		2°C
(35°F)		9°C
(49°F)		17°C
(63°F)		22°C
(71°F)		24°C
(76°F)		23°C
(75°F)		20°C
(68°F)		13°C
(55°F)		4°C
(39°F)		-2°C
(29°F)
Daily mean-8°C
(17°F)		-7°C
(20°F)		-3°C
(27°F)		5°C
(40°F)		12°C
(53°F)		17°C
(62°F)		20°C
(67°F)		19°C
(66°F)		14°C
(58°F)		8°C
(47°F)		0°C
(33°F)		-5°C
(23°F)
Average low-13°C
(9°F)		-12°C
(11°F)		-7°C
(20°F)		0°C
(33°F)		6°C
(44°F)		11°C
(52°F)		15°C
(59°F)		14°C
(58°F)		10°C
(50°F)		5°C
(41°F)		-4°C
(26°F)		-9°C
(15°F)
Mean minimum-26°C
(-14°F)		-24°C
(-11°F)		-20°C
(-4°F)		-9°C
(16°F)		-1°C
(30°F)		6°C
(42°F)		9°C
(48°F)		7°C
(45°F)		1°C
(35°F)		-3°C
(26°F)		-15°C
(5°F)		-23°C
(-9°F)
Minimum-31°C
(-23°F)		-27°C
(-16°F)		-23°C
(-8°F)		-14°C
(7°F)		-2°C
(29°F)		0°C
(33°F)		8°C
(46°F)		5°C
(42°F)		-4°C
(26°F)		-6°C
(22°F)		-19°C
(-2°F)		-28°C
(-18°F)

Compare climate in Rock Island with other places

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

Monthly average precipitation in Rock Island, Canada

Rock Island usually has the most precipitation in June, July and October, with an average of 14 rainy days and 128 mm (5.0 inches) of precipitation per month. The driest months in Rock Island are February, March and September. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rock Island. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)88 (3.5)82 (3.2)80 (3.1)112 (4.4)103 (4.1)116 (4.5)119 (4.7)104 (4.1)83 (3.3)149 (5.9)114 (4.5)84 (3.3)
Average precipitation days (≥ 1 mm)13151216131415169151616

Monthly sunshine hours in Rock Island, Canada

The sunniest months in Rock Island are June, July and August, when the sun shines an average of 10 hours 36 minutes a day. Least sunny months in Rock Island: January, November and December receive an average of 3 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rock Island. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours104146216208271320327328282185134128
Mean daily daylight hours9h 12m10h 25m11h 57m13h 31m14h 52m15h 32m15h 10m13h 58m12h 27m10h 54m9h 31m8h 48m

Solar UV radiation in Rock Island, Canada

Rock Island 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 Rock Island UV Index data.

Average daily maximum UV levels by month for Rock Island. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)245799987532