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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 71°F, while the coldest is January averaging around −2°F at night. Precipitation totals about 19 inches a year and is strongly seasonal — July alone averages 3.3 inches while February barely receives 0.74 inches. Snowfall is heavy (70 inches 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.
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 figuresHours 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 (°F) | 18 | 26 | 32 | 47 | 61 | 67 | 71 | 69 | 61 | 44 | 27 | 20 |
| Avg temp (°F) | 8 | 15 | 21 | 36 | 47 | 55 | 58 | 56 | 49 | 35 | 19 | 11 |
| Avg low (°F) | −2 | 4 | 9 | 24 | 34 | 42 | 46 | 43 | 37 | 26 | 10 | 1 |
| Precipitation (in) | 1.1 | 0.7 | 1.0 | 0.9 | 1.6 | 2.9 | 3.3 | 2.3 | 1.8 | 1.3 | 1.4 | 1.0 |
| Snowfall (in) | 11.0 | 7.4 | 10.0 | 5.8 | 1.8 | 0.0 | 0.1 | — | 2.1 | 8.2 | 13.8 | 10.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 18 | 26 | 32 | 47 | 61 | 67 |
| Avg temp (°F) | 8 | 15 | 21 | 36 | 47 | 55 |
| Avg low (°F) | −2 | 4 | 9 | 24 | 34 | 42 |
| Precipitation (in) | 1.1 | 0.7 | 1.0 | 0.9 | 1.6 | 2.9 |
| Snowfall (in) | 11.0 | 7.4 | 10.0 | 5.8 | 1.8 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 71 | 69 | 61 | 44 | 27 | 20 |
| Avg temp (°F) | 58 | 56 | 49 | 35 | 19 | 11 |
| Avg low (°F) | 46 | 43 | 37 | 26 | 10 | 1 |
| Precipitation (in) | 3.3 | 2.3 | 1.8 | 1.3 | 1.4 | 1.0 |
| Snowfall (in) | 0.1 | — | 2.1 | 8.2 | 13.8 | 10.2 |
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 (mph) | 1.2 | 1.3 | 1.1 | 0.7 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.7 | 1.1 |
| 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 (mph) | 1.2 | 1.3 | 1.1 | 0.7 | 0.3 | 0.2 |
| 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 (mph) | 0.2 | 0.2 | 0.2 | 0.2 | 0.7 | 1.1 |
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.