July in Greensborough runs hotter than in 91% of Canadian towns
Midwinter brings lows of about −10.1°C. From frozen January to warm July, readings climb 37°C. Frost is rarer than in 70% of Canadian towns: about 145 nights a year drop below freezing. Plan time outside for June, August and September, when highs sit at 22–26°C.
These are not Greensborough’s own readings: ECCC keeps no normals there, so the page uses Toronto Buttonville (Airport), 9.8 km south-west.
A year in Greensborough at a glance
Each month’s typical high and low, in °C.
What stands out about Greensborough’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Greensborough feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 145 days, 20°C on 126
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
About 862 mm of rain and snow a year
The most falls in June, the least in February. About 113 days a year bring 1 mm or more.
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 Greensborough
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. Homes here need less heating than 74% of Canadian towns.
Living with Greensborough’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Tender plants are usually safe from around 3 May until frost returns near 13 October: about 161 days.
For long days outdoors, Jun, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Bitter wind chill, under −20, comes on about 22 days a year.
Expect around 55 sticky days a year with the humidex above 30.
Averages smooth over blizzards, ice storms, floods and heat waves; Greensborough’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Toronto Buttonville (Airport)
Toronto Buttonville (Airport) is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 9.8 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 | Toronto (City), 28 km |
How Greensborough 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
Places around Greensborough whose figures come from another normals location. The nearest places to Greensborough with figures are 14–25 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Greensborough Toronto Buttonville (Airport) | 27.3°C | −10.1°C | 862 mm |
| Pickering 14 km · Oshawa | 25.7°C 1.6°C cooler | −8.9°C 1.2°C milder | 906 mm |
| Toronto 23 km · Toronto (City) | 27.0°C about the same | −6.7°C 3.4°C milder | 823 mm |
| Uxbridge 25 km · Udora | 26.3°C 1.0°C cooler | −11.7°C 1.6°C colder | 883 mm |
Greensborough weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the 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 |
March: −25.6°C at its coldest, 26.3°C at its warmest
Year to year, January varies most (a standard deviation of 3.1°C around −6.0°C) and June least (1.2°C).
Where Greensborough’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 place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- Not on this page: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Greensborough’s climate
How warm does Greensborough get in summer?
At its warmest, in July, the normal high is 27.3°C.
How cold does Greensborough get in winter?
A typical January night falls to −10.1°C, the year’s low point.
How much rain and snow does Greensborough get?
Some 862 mm falls in a year. Most of it comes in June (87 mm), the least in February (51 mm).
How long does snow stay on the ground?
In a normal winter there are about 76 days with at least 1 cm of snow lying.
Are these figures for Greensborough itself?
The figures are ECCC’s for Toronto Buttonville (Airport); Greensborough has no normals station.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Greensborough →
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).