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Markham, Ontario climate
Dfb Warm-summer humid continental
Markham 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 −10°C at night. Precipitation is fairly even year-round, totalling about 866 mm. Winters bring significant snowfall (148 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)Markham climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | −1 | 5 | 12 | 19 | 25 | 27 | 26 | 22 | 14 | 7 | 1 |
| Avg temp (°C) | −6 | −6 | 0 | 7 | 13 | 19 | 21 | 20 | 16 | 9 | 3 | −2 |
| Avg low (°C) | −10 | −10 | −5 | 1 | 7 | 13 | 15 | 15 | 10 | 4 | −1 | −6 |
| Precipitation (mm) | 64 | 51 | 53 | 79 | 80 | 88 | 88 | 72 | 83 | 71 | 76 | 63 |
| Snowfall (cm) | 40 | 34 | 21 | 7 | 0 | — | — | — | — | 1 | 11 | 33 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −2 | −1 | 5 | 12 | 19 | 25 |
| Avg temp (°C) | −6 | −6 | 0 | 7 | 13 | 19 |
| Avg low (°C) | −10 | −10 | −5 | 1 | 7 | 13 |
| Precipitation (mm) | 64 | 51 | 53 | 79 | 80 | 88 |
| Snowfall (cm) | 40 | 34 | 21 | 7 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 26 | 22 | 14 | 7 | 1 |
| Avg temp (°C) | 21 | 20 | 16 | 9 | 3 | −2 |
| Avg low (°C) | 15 | 15 | 10 | 4 | −1 | −6 |
| Precipitation (mm) | 88 | 72 | 83 | 71 | 76 | 63 |
| Snowfall (cm) | — | — | — | 1 | 11 | 33 |
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 (%) | 90 | 88 | 82 | 77 | 74 | 70 | 66 | 67 | 71 | 78 | 84 | 89 |
| Wind speed (km/h) | 15.1 | 15.3 | 14.3 | 12.8 | 10.3 | 9.5 | 9.3 | 9.0 | 9.9 | 11.4 | 12.3 | 13.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 74 | 73 | 73 | 72 | 67 |
| Relative humidity (%) | 90 | 88 | 82 | 77 | 74 | 70 |
| Wind speed (km/h) | 15.1 | 15.3 | 14.3 | 12.8 | 10.3 | 9.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 62 | 62 | 72 | 75 | 77 |
| Relative humidity (%) | 66 | 67 | 71 | 78 | 84 | 89 |
| Wind speed (km/h) | 9.3 | 9.0 | 9.9 | 11.4 | 12.3 | 13.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Toronto Buttonville A, a weather station, about 8 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.