July in Upper Cornell runs hotter than in 91% of Canadian towns
On a normal January night the air cools to about −10.1°C. Frosty nights are scarcer than in 70% of Canadian towns. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 37°C apart. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
The nearest ECCC normals location to Upper Cornell is Toronto Buttonville (Airport), 12 km south-west, and every figure on this page is its.
A year in Upper Cornell at a glance
Each month’s typical high and low, in °C.
What stands out about Upper Cornell’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Upper Cornell feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
145 frost days and 126 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night. Some 6 nights a year drop under −20°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 862 mm a year
The most falls in June, the least in February. Some 113 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 146 cm of snow a year
From November to April snow is likely; January is the peak, at about 40 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Upper Cornell
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Measured against 18°C: each day’s shortfall in mean temperature, added over twelve months. A house here needs less heating than 74% of Canadian towns.
Living with Upper Cornell’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Between the last frost, near 3 May, and the first, near 13 October, lie about 161 frost-free days.
For long days outdoors, Jun, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Expect around 22 days a year when the wind chill sinks below −20.
Expect around 55 sticky days a year with the humidex above 30.
Thirty-year normals hide the storms and the extremes: the hazards page has Upper Cornell’s risks.
Flood & hazards →ECCC’s normals location: Toronto Buttonville (Airport)
Behind the 1991–2020 normals for Toronto Buttonville (Airport) are 3 stations, which ECCC combines into one record.
| Distance from the town | 12 km south-west |
| Station altitude | 198 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −35.2°C |
| Hottest reading, 1991–2020 | 37.8°C |
| Average wind | 12.2 km/h on average, most often from the north |
| Next-nearest location | Oshawa, 29 km |
How Upper Cornell 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
Places around Upper Cornell whose figures come from another normals location. The nearest places to Upper Cornell with figures are 12–24 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Upper Cornell Toronto Buttonville (Airport) | 27.3°C | −10.1°C | 862 mm |
| Pickering 12 km · Oshawa | 25.7°C 1.6°C cooler | −8.9°C 1.2°C milder | 906 mm |
| Toronto 24 km · Toronto (City) | 27.0°C about the same | −6.7°C 3.4°C milder | 823 mm |
| Uxbridge 24 km · Udora | 26.3°C 1.0°C cooler | −11.7°C 1.6°C colder | 883 mm |
Upper Cornell weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.7°C | −10.1°C | −6.0°C | 64 mm | 40 cm |
| February | −1.0°C | −10.1°C | −5.6°C | 51 mm | 34 cm |
| March | 4.6°C | −5.0°C | −0.2°C | 52 mm | 20 cm |
| April | 11.8°C | 1.2°C | 6.5°C | 79 mm | 7 cm |
| May | 19.3°C | 7.4°C | 13.4°C | 80 mm | under 1 cm |
| June | 24.6°C | 13.0°C | 18.8°C | 87 mm | 0 cm |
| July | 27.3°C | 15.6°C | 21.5°C | 85 mm | 0 cm |
| August | 26.3°C | 14.8°C | 20.6°C | 72 mm | 0 cm |
| September | 21.9°C | 10.4°C | 16.2°C | 83 mm | 0 cm |
| October | 14.3°C | 4.3°C | 9.4°C | 71 mm | 1 cm |
| November | 7.4°C | −0.8°C | 3.3°C | 77 mm | 12 cm |
| December | 1.5°C | −5.8°C | −2.2°C | 63 mm | 33 cm |
| Year | 13.0°C | 2.9°C | 8.0°C | 862 mm | 146 cm |
March has run from −25.6°C to 26.3°C in thirty years
Year to year, January varies most (a standard deviation of 3.1°C around −6.0°C) and June least (1.2°C).
Where Upper Cornell’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Toronto Buttonville (Airport), the nearest location with a full year of temperatures.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Upper Cornell’s climate
How warm does Upper Cornell get in summer?
Of all twelve months, July has the warmest afternoons, about 27.3°C.
How cold does Upper Cornell get in winter?
At its coldest, in January, the normal low is −10.1°C.
How much rain and snow does Upper Cornell get?
The yearly total is about 862 mm. June gets 87 mm, the most of any month; February gets 51 mm, the least.
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 76 days a year.
Are these figures for Upper Cornell itself?
Not directly: Upper Cornell has no ECCC normals of its own, and Toronto Buttonville (Airport) stands in for it.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Upper Cornell →
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).