Ice rarely forms: Sunningdale sees fewer frosts than 75% of Canadian towns
Expect July afternoons of about 26.6°C. In July, afternoons here are warmer than in 70% of Canadian towns. The wettest month is September; the driest is February. Plan for rain or snow on about 128 days a year, the days with 1 mm or more.
Environment and Climate Change Canada’s 1991–2020 normals at its London station, 12 km east.
A year in Sunningdale at a glance
Each month’s typical high and low, in °C.
What stands out about Sunningdale’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Sunningdale feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 139 days, 20°C on 128
Frost comes from October to May; in January almost every night freezes. Heat of 30°C or more comes on about 11 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 962 mm of rain and snow a year
Rain and snow by month
Millimetres
Snowfall: about 152 cm in a normal year
The snow season runs October to April; January brings the most, about 43 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Snowfall: Strathroy-Mullifarry, 31 km away (London records no complete year of it).
Heating a home in Sunningdale
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Heating degree days total each day’s gap between its mean temperature and 18°C. That means homes here need less heating than 79% of Canadian towns.
Living with Sunningdale’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Gardens get from about 3 May to 16 October without frost, around 165 days in all.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →Bitter wind chill, under −20, comes on about 18 days a year.
Plan shade and water for about 55 days a year above 30 on the humidex.
The normals describe a typical year, not its worst days; the hazards page covers Sunningdale’s.
Flood & hazards →ECCC’s normals location: London
ECCC builds the London normals from 3 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 12 km east |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 31 km |
| Coldest reading, 1991–2020 | −29.1°C |
| Hottest reading, 1991–2020 | 37.0°C |
| Average wind | 14.0 km/h on average, most often from the west |
| Next-nearest location | Strathroy-Mullifarry, 31 km |
How Sunningdale 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 Sunningdale’s own would show the same figures). The nearest place to Sunningdale with figures is 25 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Sunningdale London | 26.6°C | −9.1°C | 962 mm |
| Strathroy 25 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
Sunningdale 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 | −1.6°C | −9.1°C | −5.4°C | 79 mm | 43 cm |
| February | −0.6°C | −9.0°C | −4.8°C | 63 mm | 32 cm |
| March | 4.6°C | −4.5°C | 0.1°C | 67 mm | 20 cm |
| April | 12.2°C | 1.4°C | 6.8°C | 89 mm | 5 cm |
| May | 19.3°C | 7.7°C | 13.5°C | 89 mm | under 1 cm |
| June | 24.4°C | 13.2°C | 18.8°C | 86 mm | 0 cm |
| July | 26.6°C | 15.3°C | 21.0°C | 81 mm | 0 cm |
| August | 25.7°C | 14.4°C | 20.1°C | 67 mm | 0 cm |
| September | 22.1°C | 10.5°C | 16.3°C | 93 mm | 0 cm |
| October | 14.7°C | 5.0°C | 9.9°C | 83 mm | 2 cm |
| November | 7.5°C | −0.3°C | 3.6°C | 88 mm | 13 cm |
| December | 1.4°C | −5.2°C | −2.0°C | 79 mm | 37 cm |
| Year | 13.0°C | 3.3°C | 8.2°C | 962 mm | 152 cm |
March: −25.6°C at its coldest, 27.2°C at its warmest
Year to year, February varies most (a standard deviation of 3.0°C around −4.8°C) and June least (1.1°C).
Where Sunningdale’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for London, the nearest location with a full year of temperatures.
- Other locations: a location missing months of precipitation or snow is filled from the nearest that has them all, never mixed month by month.
- 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: 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 Sunningdale’s climate
How warm does Sunningdale get in summer?
At its warmest, in July, the normal high is 26.6°C.
How cold does Sunningdale get in winter?
The coldest nights come in January, averaging −9.1°C.
How much rain and snow does Sunningdale get?
The yearly total is about 962 mm. September gets 93 mm, the most of any month; February gets 63 mm, the least.
Are these figures for Sunningdale itself?
Close to it: they are ECCC’s 1991–2020 normals for London, just outside Sunningdale’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Sunningdale →
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).