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Duncan, British Columbia climate
Csb Warm-summer Mediterranean
Duncan has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 76°F, while the coldest is December averaging around 33°F at night. Precipitation totals about 54 inches a year and is strongly seasonal — December alone averages 9.2 inches while July barely receives 0.81 inches. Winters bring significant snowfall (27 inches of snow per year on average).
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)Duncan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 47 | 51 | 57 | 65 | 70 | 76 | 76 | 71 | 59 | 49 | 43 |
| Avg temp (°F) | 38 | 40 | 43 | 47 | 54 | 59 | 65 | 65 | 59 | 50 | 42 | 38 |
| Avg low (°F) | 33 | 33 | 35 | 38 | 44 | 49 | 53 | 53 | 48 | 42 | 35 | 33 |
| Precipitation (in) | 9.2 | 5.7 | 5.6 | 3.1 | 2.0 | 1.3 | 0.8 | 1.2 | 1.9 | 5.0 | 8.6 | 9.2 |
| Snowfall (in) | 8.0 | 3.8 | 3.2 | 0.4 | 0.0 | — | — | — | — | 0.1 | 3.4 | 7.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 47 | 51 | 57 | 65 | 70 |
| Avg temp (°F) | 38 | 40 | 43 | 47 | 54 | 59 |
| Avg low (°F) | 33 | 33 | 35 | 38 | 44 | 49 |
| Precipitation (in) | 9.2 | 5.7 | 5.6 | 3.1 | 2.0 | 1.3 |
| Snowfall (in) | 8.0 | 3.8 | 3.2 | 0.4 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 76 | 76 | 71 | 59 | 49 | 43 |
| Avg temp (°F) | 65 | 65 | 59 | 50 | 42 | 38 |
| Avg low (°F) | 53 | 53 | 48 | 42 | 35 | 33 |
| Precipitation (in) | 0.8 | 1.2 | 1.9 | 5.0 | 8.6 | 9.2 |
| Snowfall (in) | — | — | — | 0.1 | 3.4 | 7.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 74 | 76 | 73 | 68 | 66 | 48 | 49 | 53 | 69 | 77 | 80 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 80 | 80 | 78 | 77 | 79 | 85 | 89 | 90 |
| Wind speed (mph) | 4.3 | 4.0 | 3.8 | 3.4 | 3.0 | 3.0 | 2.8 | 2.6 | 2.4 | 3.1 | 4.1 | 4.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 74 | 76 | 73 | 68 | 66 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 80 | 80 |
| Wind speed (mph) | 4.3 | 4.0 | 3.8 | 3.4 | 3.0 | 3.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 49 | 53 | 69 | 77 | 80 |
| Relative humidity (%) | 78 | 77 | 79 | 85 | 89 | 90 |
| Wind speed (mph) | 2.8 | 2.6 | 2.4 | 3.1 | 4.1 | 4.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Duncan Kelvin Creek, a weather station, about 6 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.