Photo: P199 · CC BY-SA 3.0South Glengarry has warmer summer afternoons than 91% of Canadian towns
January mornings start at about −11.8°C. Winter and summer sit 39°C apart. Only about 140 nights a year bring a frost, fewer than in 72% of Canadian towns. Plan for rain or snow on about 134 days a year, the days with 1 mm or more.
The nearest ECCC normals location to South Glengarry is Cornwall, 17 km south-west, and every figure on this page is its.
A year in South Glengarry at a glance
Each month’s typical high and low, in °C.
What stands out about South Glengarry’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in South Glengarry feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 140 days, 20°C on 125
The frost season runs October to April, and January freezes nearly every night. Deep cold, under −20°C, comes on about 8 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
1,006 mm of precipitation in a typical year
October is the wettest month and February the driest.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
198 cm of snow in a typical year
The snow season runs November to April; January brings the most, about 51 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in South Glengarry
94% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. In heating terms, homes need less heating than 71% of Canadian towns.
Living with South Glengarry’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Plan time outside for May, Jun, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Averages smooth over blizzards, ice storms, floods and heat waves; South Glengarry’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Cornwall
The page’s figures are ECCC’s 1991–2020 normals for Cornwall, one of its 450 normals locations.
| Distance from the town | 17 km south-west |
| Station altitude | 64 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −32.0°C |
| Hottest reading, 1991–2020 | 37.5°C |
| Next-nearest location | St-Anicet, 20 km |
How South Glengarry 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 South Glengarry’s own would show the same figures). The nearest place to South Glengarry with figures is 17 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| South Glengarry Cornwall | 27.3°C | −11.8°C | 1,006 mm |
| Saint-Anicet 17 km · St-Anicet | 26.7°C 0.6°C cooler | −13.0°C 1.2°C colder | 1,047 mm |
South Glengarry weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −3.8°C | −11.8°C | −7.8°C | 80 mm | 51 cm |
| February | −2.1°C | −10.6°C | −6.4°C | 63 mm | 48 cm |
| March | 3.5°C | −5.3°C | −0.9°C | 64 mm | 35 cm |
| April | 11.8°C | 2.0°C | 6.9°C | 83 mm | 11 cm |
| May | 19.8°C | 8.8°C | 14.3°C | 85 mm | 0 cm |
| June | 24.6°C | 14.1°C | 19.3°C | 95 mm | 0 cm |
| July | 27.3°C | 17.0°C | 22.2°C | 97 mm | 0 cm |
| August | 26.3°C | 16.2°C | 21.2°C | 83 mm | 0 cm |
| September | 22.0°C | 11.8°C | 16.9°C | 99 mm | 0 cm |
| October | 14.1°C | 5.7°C | 9.7°C | 100 mm | 1 cm |
| November | 6.9°C | −0.3°C | 3.3°C | 82 mm | 16 cm |
| December | 0.0°C | −6.7°C | −3.3°C | 75 mm | 37 cm |
| Year | 12.5°C | 3.4°C | 8.0°C | 1,006 mm | 198 cm |
March: −27.0°C at its coldest, 26.0°C at its warmest
The month to count on least is January: one year in three its average strays more than 3.0°C from −7.8°C. June moves least, typically by 1.1°C.
Where South Glengarry’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Cornwall, its nearest location with complete 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, 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 South Glengarry’s climate
How warm does South Glengarry get in summer?
Summer peaks in July: a typical afternoon reaches 27.3°C.
How cold does South Glengarry get in winter?
On a normal January night the air drops to −11.8°C, the coldest of the year.
How much rain and snow does South Glengarry get?
Rain and snow add up to about 1,006 mm of water a year; October brings the most (100 mm), February the least (63 mm).
Are these figures for South Glengarry itself?
Not quite: they come from Cornwall, the closest ECCC normals location to South Glengarry.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for South Glengarry →
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).