Frosty mornings in Stoneybrook are scarcer than in 75% of Canadian towns
The warmest part of a July day comes in at 26.6°C on average. Summer afternoons here are warmer than in 70% of Canadian towns. Rain and snow are spread evenly through the year: the wettest month, September, gets little more than the driest, February. The heating season runs October to April: each of those months averages under 10°C.
Read at London, 8.1 km east: ECCC’s normals for 1991–2020.
A year in Stoneybrook at a glance
Each month’s typical high and low, in °C.
What stands out about Stoneybrook’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Stoneybrook feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 139 frosts and 128 warm days a year
Frost comes from October to May; in January almost every night freezes. About 11 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
About 962 mm of rain and snow a year
About 128 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
152 cm of snow in a typical year
Snow falls from October to April, most of all in January (about 43 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Snowfall: Strathroy-Mullifarry, 34 km away (London records no complete year of it).
Heating a home in Stoneybrook
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up. A house here needs less heating than 79% of Canadian towns.
Living with Stoneybrook’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
On average the last spring frost comes around 3 May and the first autumn frost around 16 October: about 165 frost-free days between.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →Bitter wind chill, under −20, comes on about 18 days a year.
On some 55 days a year the humidex climbs past 30.
Averages smooth over blizzards, ice storms, floods and heat waves; Stoneybrook’s hazards page covers the risks.
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 | 8.1 km east |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 34 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, 34 km |
How Stoneybrook 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 Stoneybrook’s own would show the same figures). Stoneybrook has few close neighbours with figures, so the list reaches 26–38 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Stoneybrook London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 26 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
| South-West Oxford 38 km · Delhi | 27.5°C 0.9°C warmer | −8.9°C about the same | 965 mm |
Stoneybrook 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 |
February strays furthest from its normal year to year, by 3.0°C; June the least
Bars run from each month’s record low to its record high since 1991. March spans the most, from −25.6°C (2003) to 27.2°C (2012).
Where Stoneybrook’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, London: the nearest of its locations with every month’s temperatures.
- Other locations: ECCC blanks a month that fails its completeness rule, so the precipitation or snowfall here comes from the next location with all twelve months.
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Stoneybrook’s climate
How warm does Stoneybrook get in summer?
Midsummer means July, with afternoons near 26.6°C on a typical day.
How cold does Stoneybrook get in winter?
Midwinter means January, when a typical night reaches −9.1°C.
How much rain and snow does Stoneybrook get?
About 962 mm a year, rain and melted snow together. September is the wettest month (93 mm) and February the driest (63 mm).
Are these figures for Stoneybrook itself?
Close to it: they are ECCC’s 1991–2020 normals for London, just outside Stoneybrook’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Stoneybrook →
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).