Summer arrives in force in Princess-Rosethorn, hotter than in 95% of Canadian towns
January mornings start at about −8.9°C. The seasons are far apart: from a winter night to a summer afternoon the average spans 36°C. Frosty nights are scarcer than in 82% of Canadian towns. Comfortable outdoor weather, highs of 19–26°C, belongs to May, June, August and September.
1991–2020 normals from ECCC’s Toronto Pearson (Airport) location, 7.1 km west.
A year in Princess-Rosethorn at a glance
Each month’s typical high and low, in °C.
What stands out about Princess-Rosethorn’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Princess-Rosethorn 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
The frost season runs October to April, and January freezes nearly every night. 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 brings the most rain and snow; February, the least. About 106 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 115 cm in a normal 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 Princess-Rosethorn
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. Over a year, a home here needs less heating than 83% of Canadian towns.
Living with Princess-Rosethorn’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Gardens get from about 27 April to 20 October without frost, around 174 days in all.
For long days outdoors, May, Jun, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Wind chill falls below −20 on about 21 days a year: cover skin and dress in layers.
About 56 days a year feel above 30 on the humidex.
Extremes don’t show in averages: floods, wildfire smoke and ice storms are on Princess-Rosethorn’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 | 7.1 km 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 (City), 12 km |
How Princess-Rosethorn 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 Princess-Rosethorn’s own would show the same figures). No closer places have figures: these lie 13–29 km from Princess-Rosethorn.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Princess-Rosethorn Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Toronto 13 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
| Vaughan 19 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
| Oakville 27 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
Princess-Rosethorn weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| 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 |
March: −24.7°C at its coldest, 26.0°C at its warmest
From one year to the next, January’s average typically shifts by 3.0°C around its normal of −5.0°C, the widest of any month, while June’s shifts by 1.3°C.
Where Princess-Rosethorn’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Toronto Pearson (Airport), its nearest location with complete temperatures.
- Comparisons: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- 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 Princess-Rosethorn’s climate
How warm does Princess-Rosethorn get in summer?
In July, the warmest month, the typical high is 27.4°C.
How cold does Princess-Rosethorn get in winter?
Lows sink to −8.9°C on an average January night.
How much rain and snow does Princess-Rosethorn get?
The year adds up to 807 mm. June is the peak month (81 mm) and February the low one (50 mm).
How long does snow stay on the ground?
In a normal winter there are about 69 days with at least 1 cm of snow lying.
Are these figures for Princess-Rosethorn itself?
Close to it: they are ECCC’s 1991–2020 normals for Toronto Pearson (Airport), just outside Princess-Rosethorn’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Princess-Rosethorn →
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).