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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 80°F, while the coldest is January averaging around 15°F at night. Precipitation is fairly even year-round, totalling about 36 inches. Snowfall is heavy (61 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)Ancaster climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 29 | 31 | 40 | 53 | 65 | 75 | 80 | 78 | 71 | 58 | 46 | 35 |
| Avg temp (°F) | 22 | 24 | 32 | 44 | 55 | 65 | 69 | 68 | 61 | 49 | 39 | 28 |
| Avg low (°F) | 15 | 16 | 24 | 35 | 45 | 55 | 59 | 58 | 51 | 40 | 32 | 22 |
| Precipitation (in) | 2.8 | 2.1 | 2.8 | 3.4 | 3.2 | 3.1 | 3.8 | 2.6 | 3.1 | 3.2 | 3.1 | 2.7 |
| Snowfall (in) | 16.6 | 12.7 | 11.4 | 3.8 | — | — | — | — | — | 0.3 | 4.1 | 12.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 29 | 31 | 40 | 53 | 65 | 75 |
| Avg temp (°F) | 22 | 24 | 32 | 44 | 55 | 65 |
| Avg low (°F) | 15 | 16 | 24 | 35 | 45 | 55 |
| Precipitation (in) | 2.8 | 2.1 | 2.8 | 3.4 | 3.2 | 3.1 |
| Snowfall (in) | 16.6 | 12.7 | 11.4 | 3.8 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 78 | 71 | 58 | 46 | 35 |
| Avg temp (°F) | 69 | 68 | 61 | 49 | 39 | 28 |
| Avg low (°F) | 59 | 58 | 51 | 40 | 32 | 22 |
| Precipitation (in) | 3.8 | 2.6 | 3.1 | 3.2 | 3.1 | 2.7 |
| Snowfall (in) | — | — | — | 0.3 | 4.1 | 12.1 |
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 (mph) | 10.6 | 10.2 | 9.1 | 8.4 | 6.9 | 6.3 | 6.1 | 5.9 | 6.5 | 7.8 | 8.5 | 9.3 |
| 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 (mph) | 10.6 | 10.2 | 9.1 | 8.4 | 6.9 | 6.3 |
| 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 (mph) | 6.1 | 5.9 | 6.5 | 7.8 | 8.5 | 9.3 |
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.