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Ancaster, Ontario climate
Dfb Warm-summer humid continental
Ancaster has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 27°C, while the coldest is January averaging around −9°C at night. Precipitation is fairly even year-round, totalling about 911 mm. Snowfall is heavy (155 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)Ancaster climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | −1 | 4 | 12 | 19 | 24 | 27 | 26 | 22 | 14 | 8 | 1 |
| Avg temp (°C) | −6 | −5 | 0 | 7 | 13 | 19 | 21 | 20 | 16 | 9 | 4 | −2 |
| Avg low (°C) | −9 | −9 | −5 | 1 | 7 | 13 | 15 | 15 | 10 | 5 | 0 | −6 |
| Precipitation (mm) | 71 | 53 | 72 | 87 | 82 | 79 | 95 | 66 | 78 | 82 | 80 | 67 |
| Snowfall (cm) | 42 | 32 | 29 | 10 | — | — | — | — | — | 1 | 10 | 31 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | −1 | 4 | 12 | 19 | 24 |
| Avg temp (°C) | −6 | −5 | 0 | 7 | 13 | 19 |
| Avg low (°C) | −9 | −9 | −5 | 1 | 7 | 13 |
| Precipitation (mm) | 71 | 53 | 72 | 87 | 82 | 79 |
| Snowfall (cm) | 42 | 32 | 29 | 10 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 26 | 22 | 14 | 8 | 1 |
| Avg temp (°C) | 21 | 20 | 16 | 9 | 4 | −2 |
| Avg low (°C) | 15 | 15 | 10 | 5 | 0 | −6 |
| Precipitation (mm) | 95 | 66 | 78 | 82 | 80 | 67 |
| Snowfall (cm) | — | — | — | 1 | 10 | 31 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 74 | 73 | 73 | 72 | 67 | 63 | 62 | 62 | 72 | 75 | 77 |
| Relative humidity (%) | 87 | 85 | 80 | 76 | 73 | 70 | 67 | 67 | 71 | 77 | 82 | 86 |
| Wind speed (m/s) | 4.8 | 4.6 | 4.1 | 3.7 | 3.1 | 2.8 | 2.7 | 2.6 | 2.9 | 3.5 | 3.8 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 74 | 73 | 73 | 72 | 67 |
| Relative humidity (%) | 87 | 85 | 80 | 76 | 73 | 70 |
| Wind speed (m/s) | 4.8 | 4.6 | 4.1 | 3.7 | 3.1 | 2.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 62 | 62 | 72 | 75 | 77 |
| Relative humidity (%) | 67 | 67 | 71 | 77 | 82 | 86 |
| Wind speed (m/s) | 2.7 | 2.6 | 2.9 | 3.5 | 3.8 | 4.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 21 years of daily observations at Hamilton A, a weather station, about 7 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.