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Monthly climate in Fort St. John, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Fort St. John features a subarctic climate (Dfc). Temperatures typically range between -13 °C (9 °F) and 16 °C (61 °F) through the year, but rarely can drop to -44 °C (-47 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 539 mm (21.2 inches) and receives 102 rainy days on the 1 mm (0.04 inches) threshold annually. Fort St. John enjoys an average of 2807 hours of sunshine throughout the year, and daylight varies from 6 hours 58 minutes to 17 hours 33 minutes per day.

Monthly average temperatures in Fort St. John, Canada

The warmest months in Fort St. John are June, July and August, with daily mean temperatures ranging from 15 to 16 °C (59 - 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 (9 - 15 °F) throughout the day. On average each year, Fort St. John experiences 16 days above 25 °C (77.0 °F) and 182 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fort St. John. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		11°C
(52°F)		14°C
(57°F)		23°C
(74°F)		30°C
(85°F)		39°C
(103°F)		34°C
(94°F)		31°C
(88°F)		30°C
(85°F)		21°C
(70°F)		12°C
(54°F)		8°C
(46°F)
Mean maximum5°C
(41°F)		5°C
(41°F)		10°C
(49°F)		18°C
(65°F)		25°C
(77°F)		28°C
(84°F)		29°C
(85°F)		29°C
(84°F)		24°C
(76°F)		18°C
(65°F)		7°C
(45°F)		5°C
(41°F)
Average high-7°C
(19°F)		-8°C
(18°F)		-0°C
(32°F)		7°C
(45°F)		16°C
(62°F)		20°C
(68°F)		22°C
(71°F)		21°C
(70°F)		15°C
(59°F)		7°C
(45°F)		-3°C
(27°F)		-7°C
(20°F)
Daily mean-11°C
(12°F)		-13°C
(9°F)		-6°C
(22°F)		2°C
(35°F)		10°C
(51°F)		15°C
(59°F)		16°C
(61°F)		15°C
(59°F)		9°C
(49°F)		2°C
(37°F)		-6°C
(21°F)		-10°C
(15°F)
Average low-15°C
(5°F)		-18°C
(1°F)		-11°C
(12°F)		-4°C
(26°F)		4°C
(39°F)		9°C
(48°F)		10°C
(51°F)		9°C
(49°F)		4°C
(40°F)		-2°C
(29°F)		-10°C
(14°F)		-13°C
(8°F)
Mean minimum-34°C
(-29°F)		-35°C
(-31°F)		-27°C
(-17°F)		-15°C
(6°F)		-3°C
(27°F)		3°C
(38°F)		6°C
(43°F)		3°C
(38°F)		-3°C
(27°F)		-9°C
(16°F)		-22°C
(-8°F)		-29°C
(-19°F)
Minimum-41°C
(-41°F)		-44°C
(-47°F)		-34°C
(-29°F)		-25°C
(-14°F)		-7°C
(19°F)		2°C
(37°F)		4°C
(40°F)		1°C
(34°F)		-8°C
(18°F)		-13°C
(9°F)		-25°C
(-13°F)		-40°C
(-39°F)

Compare climate in Fort St. John with other places

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

Monthly average precipitation in Fort St. John, Canada

Fort St. John usually has the most precipitation in June, July and August, with an average of 12 rainy days and 77 mm (3.0 inches) of precipitation per month. The driest months in Fort St. John are January, February and December. On average, 24 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fort St. John. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)26 (1.0)26 (1.0)31 (1.2)27 (1.1)41 (1.6)81 (3.2)93 (3.7)55 (2.2)46 (1.8)41 (1.6)50 (2.0)22 (0.9)
Average precipitation days (≥ 1 mm)6697813131086115

Monthly sunshine hours in Fort St. John, Canada

The sunniest months in Fort St. John are May, June and July, when the sun shines an average of 11 hours 19 minutes a day. Least sunny months in Fort St. John: January, November and December receive an average of 3 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort St. John. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours87163227296331349360322232193113129
Mean daily daylight hours7h 38m9h 35m11h 55m14h 17m16h 24m17h 33m16h 54m14h 58m12h 39m10h 18m8h 9m6h 58m

Solar UV radiation in Fort St. John, Canada

Fort St. John 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 Fort St. John UV Index data.

Average daily maximum UV levels by month for Fort St. John. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)123577775311