Photo: Silver Dovelet · CC BY-SA 3.0Summer afternoons in Stouffville are warmer than in 91% of Canadian towns
The coldest hours of a January night bottom out at −10.1°C on average. By frosts alone, it ranks gentler than 70% of Canadian towns. Rain or snow is most frequent in June and least in February. The heating season runs October to April: each of those months averages under 10°C.
Stouffville has no ECCC normals station of its own: every figure here comes from Toronto Buttonville (Airport), 15 km south-west.
A year in Stouffville at a glance
Each month’s typical high and low, in °C.
What stands out about Stouffville’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Stouffville feels like
Each season’s and each month’s usual high and low, 1991–2020.
145 frost days and 126 days above 20°C a year
The frost season runs October to May, and January freezes nearly 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
On about 113 days a year, 1 mm or more falls.
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 Stouffville
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. In heating terms, homes need less heating than 74% of Canadian towns.
Living with Stouffville’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Between the last frost, near 3 May, and the first, near 13 October, lie about 161 frost-free days.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Aug and Sep.
Parks & trails →The wind chill passes −20 on about 22 days in a normal year.
Humid summer days, the humidex above 30, number about 55 a year.
A typical year is calm by definition; Stouffville’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: Toronto Buttonville (Airport)
ECCC builds the Toronto Buttonville (Airport) normals from 3 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 15 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, 32 km |
How Stouffville 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
The nearest places on a normals location of their own: those that share Stouffville’s would only repeat its figures. Stouffville has few close neighbours with figures, so the list reaches 18–27 km out.
Stouffville 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 | −1.7°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 |
In March, anything from −25.6°C to 26.3°C
Two years in three, January’s average falls within 3.1°C of its normal of −6.0°C; June keeps to within 1.2°C.
Where Stouffville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Toronto Buttonville (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Stouffville’s climate
How warm does Stouffville get in summer?
Afternoons average 27.3°C in July, the warmest time of year.
How cold does Stouffville get in winter?
At its coldest, in January, the normal low is −10.1°C.
How much rain and snow does Stouffville get?
Over twelve months, rain and melted snow come to 862 mm; the range runs from 51 mm in February to 87 mm in June.
How long does snow stay on the ground?
Snow lies on the ground for about 76 days in a normal year.
Are these figures for Stouffville itself?
The figures are ECCC’s for Toronto Buttonville (Airport); Stouffville has no normals station.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Stouffville →
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).