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Monthly climate in Slave Lake, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Slave Lake features a subarctic climate (Dfc). Temperatures typically range between -13 °C (8 °F) and 16 °C (61 °F) through the year, but rarely can drop to -41 °C (-42 °F) or can rise to as high as 37 °C (98 °F). The average annual precipitation amounts to about 604 mm (23.8 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually. Slave Lake enjoys an average of 2827 hours of sunshine throughout the year, and daylight varies from 7 hours 11 minutes to 17 hours 19 minutes per day.

Monthly average temperatures in Slave Lake, Canada

The warmest months in Slave Lake are June, July and August, with daily mean temperatures ranging from 14 to 16 °C (58 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -13 to -10 °C (8 - 14 °F) throughout the day. On average each year, Slave Lake experiences 12 days above 25 °C (77.0 °F) and 187 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Slave Lake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(47°F)		14°C
(57°F)		16°C
(61°F)		24°C
(76°F)		29°C
(85°F)		36°C
(97°F)		37°C
(98°F)		30°C
(85°F)		28°C
(82°F)		22°C
(73°F)		13°C
(55°F)		10°C
(50°F)
Mean maximum6°C
(43°F)		6°C
(43°F)		11°C
(52°F)		18°C
(64°F)		25°C
(77°F)		26°C
(80°F)		29°C
(85°F)		27°C
(81°F)		24°C
(75°F)		19°C
(67°F)		8°C
(47°F)		6°C
(42°F)
Average high-7°C
(20°F)		-8°C
(17°F)		0°C
(32°F)		6°C
(44°F)		16°C
(61°F)		19°C
(67°F)		21°C
(70°F)		20°C
(68°F)		14°C
(58°F)		7°C
(45°F)		-2°C
(29°F)		-6°C
(21°F)
Daily mean-11°C
(12°F)		-13°C
(8°F)		-6°C
(22°F)		1°C
(34°F)		10°C
(50°F)		14°C
(58°F)		16°C
(61°F)		14°C
(58°F)		9°C
(49°F)		2°C
(36°F)		-6°C
(22°F)		-10°C
(14°F)
Average low-16°C
(4°F)		-19°C
(-1°F)		-11°C
(13°F)		-4°C
(25°F)		3°C
(38°F)		8°C
(47°F)		10°C
(51°F)		9°C
(48°F)		4°C
(40°F)		-2°C
(28°F)		-10°C
(15°F)		-14°C
(7°F)
Mean minimum-33°C
(-28°F)		-35°C
(-30°F)		-27°C
(-16°F)		-15°C
(6°F)		-3°C
(26°F)		2°C
(35°F)		6°C
(44°F)		3°C
(38°F)		-3°C
(27°F)		-10°C
(14°F)		-22°C
(-8°F)		-29°C
(-19°F)
Minimum-41°C
(-41°F)		-41°C
(-42°F)		-34°C
(-28°F)		-26°C
(-15°F)		-6°C
(21°F)		0°C
(32°F)		5°C
(41°F)		2°C
(35°F)		-4°C
(24°F)		-16°C
(3°F)		-25°C
(-13°F)		-38°C
(-37°F)

Compare climate in Slave Lake with other places

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

Monthly average precipitation in Slave Lake, Canada

Slave Lake usually has the most precipitation in June, July and August, with an average of 13 rainy days and 100 mm (3.9 inches) of precipitation per month. The driest months in Slave Lake are January, March and December. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Slave Lake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)21 (0.8)24 (0.9)23 (0.9)34 (1.3)41 (1.6)113 (4.4)121 (4.7)67 (2.7)55 (2.2)44 (1.7)40 (1.6)22 (0.9)
Average precipitation days (≥ 1 mm)6678713151210896

Monthly sunshine hours in Slave Lake, Canada

The sunniest months in Slave Lake are May, June and July, when the sun shines an average of 11 hours 2 minutes a day. Least sunny months in Slave Lake: January, November and December receive an average of 4 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Slave Lake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours106173235269337329348318235193138140
Mean daily daylight hours7h 49m9h 40m11h 55m14h 12m16h 14m17h 19m16h 42m14h 51m12h 38m10h 22m8h 18m7h 11m

Solar UV radiation in Slave Lake, Canada

Slave Lake experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 7 - 7, which corresponds to the 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 1. For more detailed information, check out our hourly Slave Lake UV Index data.

Average daily maximum UV levels by month for Slave Lake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124577776311