Mississauga Valleys has warmer summer afternoons than 95% of Canadian towns
Nights in January average −8.9°C. By frosts alone, it ranks gentler than 82% of Canadian towns. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 36°C apart. Homes need heating from November to April, the months averaging under 10°C.
ECCC publishes no normals for Mississauga Valleys itself; the figures are those of Toronto Pearson (Airport), 9.3 km north.
A year in Mississauga Valleys at a glance
Each month’s typical high and low, in °C.
What stands out about Mississauga Valleys’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Mississauga Valleys feels like
Each season’s and each month’s usual high and low, 1991–2020.
131 frost days and 125 days above 20°C a year
The frost season runs October to April, and January freezes nearly 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
The most falls in June, the least in February. On about 106 days a year, 1 mm or more falls.
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 Mississauga Valleys
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
The total grows by a degree for every degree a day’s mean sits under 18°C. A house here needs less heating than 83% of Canadian towns.
Living with Mississauga Valleys’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Wait until about 27 April to plant out; frost tends to come back around 20 October, about 174 days later.
For long days outdoors, May, Jun, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →The wind chill passes −20 on about 21 days in a normal year.
Muggy heat with a humidex over 30 arrives on about 56 days a year.
Storms, floods and heat waves sit outside these normals; Mississauga Valleys’s hazards page covers them.
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 | 9.3 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), 18 km |
How Mississauga Valleys compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Mississauga Valleys’s own would show the same figures). Mississauga Valleys has few close neighbours with figures, so the list reaches 17–27 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Mississauga Valleys Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Oakville 17 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
| Toronto 22 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
| Vaughan 27 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
Mississauga Valleys 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 |
From year to year, January moves by 3.0°C, more than any month, and June least
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −24.7°C in 2003 to 26.0°C in 2012.
Where Mississauga Valleys’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, Toronto Pearson (Airport), 1991–2020.
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- 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 Mississauga Valleys’s climate
How warm does Mississauga Valleys get in summer?
The year’s warmest days come in July, with highs averaging 27.4°C.
How cold does Mississauga Valleys get in winter?
Winter bottoms out in January, with lows near −8.9°C.
How much rain and snow does Mississauga Valleys get?
Count on roughly 807 mm a year, heaviest in June (81 mm) and lightest in February (50 mm).
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 69 days a year.
Are these figures for Mississauga Valleys itself?
They describe Toronto Pearson (Airport), the nearest normals location, rather than Mississauga Valleys itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mississauga Valleys →
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).