Summer arrives in force in Alderwood, hotter than in 95% of Canadian towns
The depth of winter brings overnight lows near −8.9°C. Only about 131 nights a year bring a frost, fewer than in 82% of Canadian towns. Winter and summer sit 36°C apart. Have the furnace checked before November to April, the months that average under 10°C.
Environment and Climate Change Canada’s 1991–2020 normals at its Toronto Pearson (Airport) station, 11 km north-west.
A year in Alderwood at a glance
Each month’s typical high and low, in °C.
What stands out about Alderwood’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Alderwood feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 131 days, 20°C on 125
Frost comes from October to April; in January almost every night freezes. About 17 days a year top 30°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 807 mm a year
June is the wettest month and February the driest. On about 106 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 115 cm of snow a year
From November to April snow is likely; January is the peak, at about 32 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Alderwood
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. In heating terms, homes need less heating than 83% of Canadian towns.
Living with Alderwood’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.
Humid summer days, the humidex above 30, number about 56 a year.
Ice storms, floods and heat waves are risks, not averages: they are on Alderwood’s hazards page.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Toronto Pearson (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 11 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 Alderwood 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 Alderwood’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Alderwood Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Long Branch 1.6 km · Toronto (Island) | 25.3°C 2.1°C cooler | −7.1°C 1.8°C milder | 807 mm |
| Dixie 2.9 km · Toronto Pearson (Airport) | 27.4°C about the same | −8.9°C about the same | 807 mm |
Alderwood 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 |
The most changeable month: January, give or take 3.0°C; the steadiest, June
The thirty-year records stretch furthest in March: a low of −24.7°C in 2003 and a high of 26.0°C in 2012.
Where Alderwood’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Toronto Pearson (Airport), the closest ECCC location with twelve months of temperature normals.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- 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 Alderwood’s climate
How warm does Alderwood get in summer?
Afternoons average 27.4°C in July, the warmest time of year.
How cold does Alderwood get in winter?
Winter bottoms out in January, with lows near −8.9°C.
How much rain and snow does Alderwood get?
807 mm a year counting snow as water. The wettest month is June (81 mm); the driest, 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 Alderwood itself?
Close to it: they are ECCC’s 1991–2020 normals for Toronto Pearson (Airport), just outside Alderwood’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Alderwood →
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).