nomadseason

Monthly climate in Williams Lake, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Williams Lake features a humid continental climate (Dfb). Temperatures typically range between -8 °C (18 °F) and 17 °C (63 °F) through the year, but rarely can drop to -39 °C (-38 °F) or can rise to as high as 41 °C (107 °F). The average annual precipitation amounts to about 552 mm (21.7 inches) and receives 116 rainy days on the 1 mm (0.04 inches) threshold annually. Williams Lake enjoys an average of 2805 hours of sunshine throughout the year, and daylight varies from 7 hours 47 minutes to 16 hours 39 minutes per day.

Monthly average temperatures in Williams Lake, Canada

The warmest months in Williams Lake are June, July and August, with daily mean temperatures ranging from 15 to 17 °C (58 - 63 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -6 °C (18 - 21 °F) throughout the day. On average each year, Williams Lake experiences 29 days above 25 °C (77.0 °F) and 161 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williams Lake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum6°C
(43°F)		10°C
(50°F)		16°C
(61°F)		24°C
(76°F)		29°C
(84°F)		41°C
(107°F)		40°C
(105°F)		35°C
(95°F)		28°C
(83°F)		22°C
(72°F)		11°C
(52°F)		8°C
(47°F)
Mean maximum6°C
(42°F)		6°C
(44°F)		12°C
(54°F)		19°C
(67°F)		25°C
(77°F)		29°C
(85°F)		33°C
(92°F)		33°C
(91°F)		26°C
(79°F)		17°C
(63°F)		10°C
(51°F)		5°C
(42°F)
Average high-3°C
(27°F)		-3°C
(27°F)		5°C
(41°F)		10°C
(51°F)		18°C
(64°F)		21°C
(69°F)		24°C
(75°F)		24°C
(75°F)		17°C
(63°F)		9°C
(48°F)		3°C
(37°F)		-3°C
(26°F)
Daily mean-6°C
(21°F)		-8°C
(18°F)		-1°C
(31°F)		4°C
(40°F)		11°C
(53°F)		15°C
(58°F)		17°C
(63°F)		17°C
(62°F)		11°C
(53°F)		4°C
(39°F)		-0°C
(31°F)		-6°C
(21°F)
Average low-10°C
(14°F)		-13°C
(10°F)		-6°C
(22°F)		-1°C
(30°F)		5°C
(41°F)		8°C
(47°F)		11°C
(51°F)		10°C
(51°F)		6°C
(44°F)		-0°C
(32°F)		-3°C
(26°F)		-10°C
(15°F)
Mean minimum-28°C
(-18°F)		-27°C
(-16°F)		-19°C
(-3°F)		-9°C
(17°F)		-1°C
(30°F)		3°C
(38°F)		6°C
(44°F)		5°C
(41°F)		-1°C
(31°F)		-10°C
(14°F)		-12°C
(10°F)		-22°C
(-7°F)
Minimum-39°C
(-38°F)		-34°C
(-28°F)		-28°C
(-18°F)		-18°C
(-1°F)		-3°C
(28°F)		1°C
(35°F)		5°C
(41°F)		3°C
(37°F)		-2°C
(28°F)		-19°C
(-2°F)		-15°C
(5°F)		-36°C
(-32°F)

Compare climate in Williams Lake with other places

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

Monthly average precipitation in Williams Lake, Canada

Williams Lake usually has the most precipitation in July, September and October, with an average of 11 rainy days and 67 mm (2.6 inches) of precipitation per month. The driest months in Williams Lake are January, March and April. On average, 32 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williams Lake. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)30 (1.2)42 (1.7)31 (1.2)35 (1.4)39 (1.5)46 (1.8)60 (2.4)36 (1.4)68 (2.7)73 (2.9)52 (2.1)41 (1.6)
Average precipitation days (≥ 1 mm)7108910109711131210

Monthly sunshine hours in Williams Lake, Canada

The sunniest months in Williams Lake are May, June and July, when the sun shines an average of 11 hours 15 minutes a day. Least sunny months in Williams Lake: January, November and December receive an average of 3 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williams Lake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours102156229275336331367329229188133124
Mean daily daylight hours8h 19m9h 56m11h 56m13h 58m15h 44m16h 39m16h 8m14h 32m12h 34m10h 33m8h 44m7h 47m

Solar UV radiation in Williams Lake, Canada

Williams Lake experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 8, 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 Williams Lake UV Index data.

Average daily maximum UV levels by month for Williams Lake. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)234578886421