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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 25°C, while the coldest is December averaging around 0°C at night. Precipitation totals about 1360 mm a year and is strongly seasonal — December alone averages 234 mm while July barely receives 21 mm. Winters bring significant snowfall (68 cm 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 (°C) | 7 | 9 | 11 | 14 | 18 | 21 | 25 | 25 | 22 | 15 | 9 | 6 |
| Avg temp (°C) | 4 | 5 | 6 | 9 | 12 | 15 | 18 | 18 | 15 | 10 | 6 | 3 |
| Avg low (°C) | 0 | 1 | 2 | 3 | 7 | 9 | 12 | 12 | 9 | 5 | 2 | 0 |
| Precipitation (mm) | 233 | 144 | 143 | 79 | 50 | 34 | 21 | 31 | 48 | 126 | 218 | 234 |
| Snowfall (cm) | 20 | 10 | 8 | 1 | 0 | — | — | — | — | 0 | 9 | 20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 9 | 11 | 14 | 18 | 21 |
| Avg temp (°C) | 4 | 5 | 6 | 9 | 12 | 15 |
| Avg low (°C) | 0 | 1 | 2 | 3 | 7 | 9 |
| Precipitation (mm) | 233 | 144 | 143 | 79 | 50 | 34 |
| Snowfall (cm) | 20 | 10 | 8 | 1 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 22 | 15 | 9 | 6 |
| Avg temp (°C) | 18 | 18 | 15 | 10 | 6 | 3 |
| Avg low (°C) | 12 | 12 | 9 | 5 | 2 | 0 |
| Precipitation (mm) | 21 | 31 | 48 | 126 | 218 | 234 |
| Snowfall (cm) | — | — | — | 0 | 9 | 20 |
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 (m/s) | 1.9 | 1.8 | 1.7 | 1.5 | 1.3 | 1.3 | 1.3 | 1.1 | 1.1 | 1.4 | 1.8 | 2.0 |
| 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 (m/s) | 1.9 | 1.8 | 1.7 | 1.5 | 1.3 | 1.3 |
| 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 (m/s) | 1.3 | 1.1 | 1.1 | 1.4 | 1.8 | 2.0 |
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.