Summer arrives in force in South Common, hotter than in 95% of Canadian towns
The coldest hours of a January night bottom out at −8.9°C on average. By frosts alone, it ranks gentler than 82% of Canadian towns. From frozen January to warm July, readings climb 36°C. Expect about 131 frosty starts a year, days when the air falls to freezing.
The nearest ECCC normals location to South Common is Toronto Pearson (Airport), 16 km north, and every figure on this page is its.
A year in South Common at a glance
Each month’s typical high and low, in °C.
What stands out about South Common’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in South Common feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 131 days, 20°C on 125
Frost comes from October to April; in January almost every night freezes. Some 17 days a year climb past 30°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 807 mm a year
June brings the most rain and snow; February, the least. Some 106 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 115 cm of snow a year
Expect snow from November to April, with about 32 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in South Common
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. Homes here need less heating than 83% of Canadian towns.
Living with South Common’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
From about 27 April to 20 October the garden is usually clear of frost, some 174 days.
Plan time outside for May, Jun, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Bitter wind chill, under −20, comes on about 21 days a year.
Plan shade and water for about 56 days a year above 30 on the humidex.
The normals describe a typical year, not its worst days; the hazards page covers South Common’s.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Toronto Pearson (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 16 km north |
| Station altitude | 173 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.0°C |
| Hottest reading, 1991–2020 | 37.9°C |
| Average wind | 15.7 km/h on average, most often from the west |
| Next-nearest location | Toronto (Island), 25 km |
How South Common compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Ontario.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share South Common’s would only repeat its figures. South Common has no close neighbour with figures; the nearest is 10 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| South Common Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Oakville 9.6 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
South Common weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.2°C | −8.9°C | −5.0°C | 62 mm | 32 cm |
| February | −0.3°C | −8.5°C | −4.4°C | 50 mm | 28 cm |
| March | 5.0°C | −3.8°C | 0.6°C | 51 mm | 17 cm |
| April | 12.0°C | 1.9°C | 7.0°C | 77 mm | 5 cm |
| May | 19.2°C | 8.2°C | 13.7°C | 78 mm | under 1 cm |
| June | 24.5°C | 13.9°C | 19.2°C | 81 mm | 0 cm |
| July | 27.4°C | 16.6°C | 22.1°C | 74 mm | 0 cm |
| August | 26.3°C | 15.8°C | 21.1°C | 69 mm | 0 cm |
| September | 22.3°C | 11.6°C | 16.9°C | 69 mm | 0 cm |
| October | 14.6°C | 5.3°C | 10.0°C | 67 mm | under 1 cm |
| November | 7.9°C | 0.2°C | 4.1°C | 72 mm | 9 cm |
| December | 1.9°C | −5.0°C | −1.6°C | 59 mm | 24 cm |
| Year | 13.3°C | 3.9°C | 8.6°C | 807 mm | 115 cm |
March has run from −24.7°C to 26.0°C in thirty years
The month to count on least is January: one year in three its average strays more than 3.0°C from −5.0°C. June moves least, typically by 1.3°C.
Where South Common’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Toronto Pearson (Airport), the closest ECCC location with twelve months of temperature normals.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about South Common’s climate
How warm does South Common get in summer?
Expect highs near 27.4°C in July, the hottest month on average.
How cold does South Common get in winter?
Lows sink to −8.9°C on an average January night.
How much rain and snow does South Common get?
Measured as water, a year brings 807 mm: 81 mm in June, the wettest month, and 50 mm in February, the driest.
How long does snow stay on the ground?
Snow cover of 1 cm or more lasts about 69 days in a typical year.
Are these figures for South Common itself?
No: South Common has no normals location, so the figures come from Toronto Pearson (Airport), the nearest with 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for South Common →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).