Erin Mills has warmer summer afternoons than 95% of Canadian towns
The depth of winter brings overnight lows near −8.9°C. By frosts alone, it ranks gentler than 82% of Canadian towns. Seasons differ by 36°C, from the coldest nights to the warmest afternoons. About 106 days a year bring 1 mm of precipitation or more.
Erin Mills has no ECCC normals station of its own: every figure here comes from Toronto Pearson (Airport), 17 km north.
A year in Erin Mills at a glance
Each month’s typical high and low, in °C.
What stands out about Erin Mills’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Erin Mills feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
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. About 17 days a year top 30°C.
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 is the wettest month and February the driest.
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 Erin Mills
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. Over a year, a home here needs less heating than 83% of Canadian towns.
Living with Erin Mills’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Frost usually lets go around 27 April and returns near 20 October, about 174 days apart.
Afternoons of 17–27°C and nights of at least 8°C arrive in May, Jun, Aug and Sep.
Parks & trails →Count on some 21 days a year when the wind makes it feel below −20.
The humidex tops 30 on about 56 days a year: muggy days to plan around.
A typical year is calm by definition; Erin Mills’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Behind the 1991–2020 normals for Toronto Pearson (Airport) are 2 stations, which ECCC combines into one record.
| Distance from the town | 17 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), 26 km |
How Erin Mills 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 Erin Mills whose figures come from another normals location. The nearest place to Erin Mills with figures is 9 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Erin Mills Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Oakville 9.1 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
Erin Mills 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
Bars run from each month’s record low to its record high over 1991–2020; January is the month whose average wanders most from year to year (±3.0°C around −5.0°C), June the one that wanders least (±1.3°C).
Where Erin Mills’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Toronto Pearson (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Erin Mills’s climate
How warm does Erin Mills get in summer?
On a normal day in July the thermometer climbs to 27.4°C, the warmest of the year.
How cold does Erin Mills get in winter?
At its coldest, in January, the normal low is −8.9°C.
How much rain and snow does Erin Mills get?
About 807 mm a year, rain and melted snow together. June is the wettest month (81 mm) and February the driest (50 mm).
How long does snow stay on the ground?
There is 1 cm of snow or more on the ground on roughly 69 days a year.
Are these figures for Erin Mills itself?
Only indirectly: the readings are made at Toronto Pearson (Airport), outside Erin Mills.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Erin Mills →
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).