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Chilliwack, British Columbia climate
Cfb Oceanic / temperate
Chilliwack has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around 1°C at night. Precipitation totals about 1705 mm a year and is strongly seasonal — November alone averages 257 mm while July barely receives 49 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 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)Chilliwack climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 9 | 11 | 15 | 19 | 21 | 25 | 25 | 22 | 15 | 9 | 6 |
| Avg temp (°C) | 3 | 5 | 7 | 10 | 14 | 16 | 19 | 19 | 16 | 11 | 6 | 4 |
| Avg low (°C) | 1 | 2 | 3 | 6 | 9 | 11 | 13 | 13 | 11 | 7 | 4 | 1 |
| Precipitation (mm) | 247 | 134 | 171 | 121 | 97 | 84 | 49 | 57 | 98 | 186 | 257 | 202 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 9 | 11 | 15 | 19 | 21 |
| Avg temp (°C) | 3 | 5 | 7 | 10 | 14 | 16 |
| Avg low (°C) | 1 | 2 | 3 | 6 | 9 | 11 |
| Precipitation (mm) | 247 | 134 | 171 | 121 | 97 | 84 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 22 | 15 | 9 | 6 |
| Avg temp (°C) | 19 | 19 | 16 | 11 | 6 | 4 |
| Avg low (°C) | 13 | 13 | 11 | 7 | 4 | 1 |
| Precipitation (mm) | 49 | 57 | 98 | 186 | 257 | 202 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 73 | 73 | 70 | 70 | 51 | 51 | 56 | 70 | 74 | 73 |
| Relative humidity (%) | 95 | 92 | 90 | 84 | 80 | 80 | 78 | 78 | 79 | 85 | 93 | 95 |
| Wind speed (mph) | 0.6 | 0.6 | 0.6 | 0.6 | 0.5 | 0.4 | 0.5 | 0.6 | 0.7 | 0.6 | 0.5 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 73 | 73 | 70 | 70 |
| Relative humidity (%) | 95 | 92 | 90 | 84 | 80 | 80 |
| Wind speed (mph) | 0.6 | 0.6 | 0.6 | 0.6 | 0.5 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 51 | 56 | 70 | 74 | 73 |
| Relative humidity (%) | 78 | 78 | 79 | 85 | 93 | 95 |
| Wind speed (mph) | 0.5 | 0.6 | 0.7 | 0.6 | 0.5 | 0.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Agassiz Rcs, a weather station, about 16 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.