Summer afternoons in Humber Summit are warmer than in 95% of Canadian towns
January mornings start at about −8.9°C. Frosty nights are scarcer than in 82% of Canadian towns. Precipitation peaks in June and eases off in February. Plan time outside for May, June, August and September, when highs sit at 19–26°C.
Figures: ECCC’s 1991–2020 normals for Toronto Pearson (Airport) (9.6 km south-west).
A year in Humber Summit at a glance
Each month’s typical high and low, in °C.
What stands out about Humber Summit’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Humber Summit feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 131 frosts and 125 warm days a year
From October to April frost is routine, and in January it comes on almost every night. 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
807 mm of precipitation in a typical year
About 106 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 115 cm of snow a year
The snow season runs November to April; January brings the most, about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Humber Summit
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up. Homes here need less heating than 83% of Canadian towns.
Living with Humber Summit’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
The frost-free stretch runs from about 27 April to about 20 October, some 174 days in a normal year.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark May, Jun, Aug and Sep.
Parks & trails →On some 21 days a year the wind chill drops past −20; mitts and a scarf earn their place.
Roughly 56 days a year feel hotter than 30 once humidity is counted.
Severe weather is a separate story from the averages: see Humber Summit’s hazards page.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
ECCC builds the Toronto Pearson (Airport) normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 9.6 km south-west |
| 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 (City), 16 km |
How Humber Summit 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 Humber Summit whose figures come from another normals location. Distances here run 10–24 km: that is how far the nearest places with figures are from Humber Summit.
Humber Summit 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 |
In March, anything from −24.7°C to 26.0°C
January is the least predictable month: about two years in three its average lands within 3.0°C of the normal, −5.0°C. June is the steadiest, within 1.3°C.
Where Humber Summit’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: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- 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 Humber Summit’s climate
How warm does Humber Summit get in summer?
At its warmest, in July, the normal high is 27.4°C.
How cold does Humber Summit get in winter?
On a normal January night the air drops to −8.9°C, the coldest of the year.
How much rain and snow does Humber Summit get?
807 mm a year counting snow as water. The wettest month is June (81 mm); the driest, February (50 mm).
How long does snow stay on the ground?
In a normal winter there are about 69 days with at least 1 cm of snow lying.
Are these figures for Humber Summit itself?
Nearly: Toronto Pearson (Airport), the location behind them, sits just beyond Humber Summit’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Humber Summit →
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).