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Fort St. John, British Columbia climate

Dfc Subarctic

Fort St. John has a strongly seasonal subarctic climate (Subarctic, Köppen Dfc). The hottest month is July with an average daily high near 21°C, while the coldest is January averaging around −19°C at night. Precipitation totals about 491 mm a year and is strongly seasonal — July alone averages 84 mm while February barely receives 19 mm. Snowfall is heavy (179 cm of snow per year on average). At latitude 56°N, day length swings from 6.6 hours in midwinter to 17.4 hours at midsummer.

☀️ Summers

Mild

Highs near 21°C in July.

❄️ Winters

Bitterly cold

Lows near −19°C in January.

🌧️ Rain & snow

Fairly dry

About 491 mm of rain a year, plus 179 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Fort St. John climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−8	−4	0	9	16	20	21	21	16	7	−3	−7
Avg temp (°C)	−14	−10	−6	2	8	13	15	13	9	2	−7	−12
Avg low (°C)	−19	−16	−13	−4	1	6	8	6	3	−3	−12	−17
Precipitation (mm)	28	19	26	22	40	74	84	58	45	33	36	26
Snowfall (cm)	28	19	26	15	5	0	0	—	5	21	35	26

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−8	−4	0	9	16	20
Avg temp (°C)	−14	−10	−6	2	8	13
Avg low (°C)	−19	−16	−13	−4	1	6
Precipitation (mm)	28	19	26	22	40	74
Snowfall (cm)	28	19	26	15	5	0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	21	21	16	7	−3	−7
Avg temp (°C)	15	13	9	2	−7	−12
Avg low (°C)	8	6	3	−3	−12	−17
Precipitation (mm)	84	58	45	33	36	26
Snowfall (cm)	0	—	5	21	35	26

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	71	67	67	65	66	68	63	63	67	71	72	70
Relative humidity (%)	99	99	98	85	74	74	73	70	75	85	96	99
Wind speed (km/h)	2.0	2.0	1.8	1.2	0.4	0.3	0.3	0.3	0.3	0.4	1.1	1.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	71	67	67	65	66	68
Relative humidity (%)	99	99	98	85	74	74
Wind speed (km/h)	2.0	2.0	1.8	1.2	0.4	0.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	63	63	67	71	72	70
Relative humidity (%)	73	70	75	85	96	99
Wind speed (km/h)	0.3	0.3	0.3	0.4	1.1	1.7

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 22 years of daily observations at Charlie Lake, a weather station, about 12 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →