Summer arrives in force in Mississauga, hotter than in 95% of Canadian towns
The coldest hours of a January night bottom out at −8.9°C on average. Frosty nights are scarcer than in 82% of Canadian towns. Some 36°C separates winter nights from summer afternoons. Ice scrapers and block heaters earn their keep on roughly 131 days a year at 0°C or below.
Environment and Climate Change Canada’s 1991–2020 normals, measured at Toronto Pearson (Airport), 11 km north.
A year in Mississauga at a glance
Each month’s typical high and low, in °C.
What stands out about Mississauga’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Mississauga feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 131 days, 20°C on 125
From October to April frost is routine, and in January it comes on almost every night. Heat of 30°C or more comes on about 17 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 807 mm of rain and snow a year
June brings the most rain and snow; February, the least. 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
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C. By this count, homes here need less heating than 83% of Canadian towns.
Living with Mississauga’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.
Plan time outside for May, Jun, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →On some 21 days a year the wind chill drops past −20; mitts and a scarf earn their place.
About 56 days a year turn sultry, with the humidex past 30.
A normal year has no blizzard, flood or heat wave in it; Mississauga’s hazards page looks at those.
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 | 11 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), 22 km |
How Mississauga compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Mississauga’s own would show the same figures). Mississauga has few close neighbours with figures, so the list reaches 15–30 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Mississauga Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Oakville 15 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
| Toronto 26 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
| Vaughan 30 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
Mississauga weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| 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
Bars run from each month’s record low to its record high since 1991. March spans the most, from −24.7°C (2003) to 26.0°C (2012).
Where Mississauga’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: 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 Mississauga’s climate
How warm does Mississauga get in summer?
At its warmest, in July, the normal high is 27.4°C.
How cold does Mississauga get in winter?
Overnight lows average −8.9°C in January, the coldest month.
How much rain and snow does Mississauga get?
Around 807 mm a year in all, from 81 mm in June down to 50 mm in February.
How long does snow stay on the ground?
About 69 days a year have 1 cm of snow or more on the ground.
Are these figures for Mississauga itself?
Yes: ECCC’s 1991–2020 normals for Toronto Pearson (Airport), which is in Mississauga.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mississauga →
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).