Thornhill Woods has warmer summer afternoons than 91% of Canadian towns
January nights here settle around −10.1°C. Some 37°C separates winter nights from summer afternoons. Only about 145 nights a year bring a frost, fewer than in 70% of Canadian towns. About 113 days a year bring 1 mm of precipitation or more.
Borrowed figures: Thornhill Woods has no normals station, so these come from Toronto Buttonville (Airport), 8.1 km east.
A year in Thornhill Woods at a glance
Each month’s typical high and low, in °C.
What stands out about Thornhill Woods’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Thornhill Woods feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 145 days, 20°C on 126
From October to May frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 6 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
862 mm of precipitation in a typical year
June brings the most rain and snow; February, the least.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 146 cm in a normal year
Expect snow from November to April, with about 40 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 Thornhill Woods
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year. In heating terms, homes need less heating than 74% of Canadian towns.
Living with Thornhill Woods’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Seedlings can go out once the average last frost, around 3 May, has passed; autumn’s first, near 13 October, ends a season of about 161 days.
Highs of 17–27°C with nights of 8°C or more come in Jun, Aug and Sep.
Parks & trails →A wind chill below −20 is part of about 22 days a year here.
The humidex tops 30 on about 55 days a year: muggy days to plan around.
Averages smooth over blizzards, ice storms, floods and heat waves; Thornhill Woods’s hazards page covers the risks.
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 | 8.1 km east |
| 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 | Toronto (City), 20 km |
How Thornhill Woods 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 Thornhill Woods’s own would show the same figures). The nearest places to Thornhill Woods with figures are 15–29 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Thornhill Woods Toronto Buttonville (Airport) | 27.3°C | −10.1°C | 862 mm |
| Toronto 15 km · Toronto (City) | 27.0°C about the same | −6.7°C 3.4°C milder | 823 mm |
| Bolton 27 km · Toronto Pearson (Airport) | 27.4°C about the same | −8.9°C 1.2°C milder | 807 mm |
| Pickering 29 km · Oshawa | 25.7°C 1.6°C cooler | −8.9°C 1.2°C milder | 906 mm |
Thornhill Woods weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| 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 |
The month with the widest range: March, −25.6°C to 26.3°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 (±3.1°C around −6.0°C), June the one that wanders least (±1.2°C).
Where Thornhill Woods’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: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Thornhill Woods’s climate
How warm does Thornhill Woods get in summer?
Summer peaks in July: a typical afternoon reaches 27.3°C.
How cold does Thornhill Woods get in winter?
Lows sink to −10.1°C on an average January night.
How much rain and snow does Thornhill Woods get?
Rain and snow, with snow counted as water, total 862 mm a year; June leads with 87 mm and February trails with 51 mm.
How long does snow stay on the ground?
Roughly 76 days a year start with snow cover of 1 cm or more.
Are these figures for Thornhill Woods itself?
Not as such: Toronto Buttonville (Airport) is the nearest normals location, and Thornhill Woods has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Thornhill Woods →
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).