Summer arrives in force in Islington, hotter than in 95% of Canadian towns
In January the night’s low is typically −8.9°C. By frosts alone, it ranks gentler than 82% of Canadian towns. Precipitation peaks in June and eases off in February. Comfortable outdoor weather, highs of 19–26°C, belongs to May, June, August and September.
Environment and Climate Change Canada’s 1991–2020 normals at its Toronto Pearson (Airport) station, 7.6 km north-west.
A year in Islington at a glance
Each month’s typical high and low, in °C.
What stands out about Islington’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Islington feels like
Each season’s and each month’s usual high and low, 1991–2020.
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. Heat of 30°C or more comes on about 17 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 807 mm a year
On about 106 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 115 cm in a normal year
The snow season runs November to April; January brings the most, about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Islington
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Every day colder than 18°C on average adds its gap in degrees to the year’s heating total. That means homes here need less heating than 83% of Canadian towns.
Living with Islington’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Count on about 174 frost-free days: the last frost averages 27 April, the first 20 October.
The outdoor season by the averages is May, Jun, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →The wind chill passes −20 on about 21 days in a normal year.
Muggy heat with a humidex over 30 arrives on about 56 days a year.
Thirty-year normals hide the storms and the extremes: the hazards page has Islington’s risks.
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 | 7.6 km north-west |
| 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), 12 km |
How Islington 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 Islington’s own would show the same figures). The nearest places to Islington with figures are 15–28 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Islington Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Toronto 15 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
| Vaughan 21 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
| Oakville 25 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
Islington 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 |
From year to year, January moves by 3.0°C, more than any month, and June least
Records from 1991 to 2020: no month spans more than March, between −24.7°C (2003) and 26.0°C (2012).
Where Islington’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, Toronto Pearson (Airport), 1991–2020.
- 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 Islington’s climate
How warm does Islington get in summer?
The year’s warmest days come in July, with highs averaging 27.4°C.
How cold does Islington get in winter?
Of all twelve months, January has the coldest nights, about −8.9°C.
How much rain and snow does Islington get?
Count on roughly 807 mm a year, heaviest in June (81 mm) and lightest in February (50 mm).
How long does snow stay on the ground?
On about 69 days a year the ground keeps at least 1 cm of snow.
Are these figures for Islington itself?
Close to it: they are ECCC’s 1991–2020 normals for Toronto Pearson (Airport), just outside Islington’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Islington →
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).