Ice rarely forms: Bostwick sees fewer frosts than 75% of Canadian towns
High summer brings afternoon highs near 26.6°C. Winter and summer sit 36°C apart. In July, afternoons here are warmer than in 70% of Canadian towns. Have the furnace checked before October to April, the months that average under 10°C.
Environment and Climate Change Canada’s 1991–2020 normals at its London station, 15 km north-east.
A year in Bostwick at a glance
Each month’s typical high and low, in °C.
What stands out about Bostwick’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Bostwick feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
139 frost days and 128 days above 20°C a year
Frost comes from October to May; in January almost every night freezes. Some 11 days a year climb past 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
The most falls in September, the least in February. Some 128 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
About 152 cm of snow a year
Expect snow from October to April, with about 43 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
London publishes no full year of snowfall, so these figures come from Strathroy-Mullifarry, 31 km away.
Heating a home in Bostwick
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. That means homes here need less heating than 79% of Canadian towns.
Living with Bostwick’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
A normal year gives the garden about 165 frost-free days, roughly 3 May to 16 October.
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 →On some 18 days a year the wind chill drops past −20; mitts and a scarf earn their place.
Muggy heat with a humidex over 30 arrives on about 55 days a year.
For blizzards, floods and wildfire, turn to Bostwick’s hazards page.
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 | 15 km north-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 Bostwick compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Ontario.
Nearby towns’ climate
Places around Bostwick whose figures come from another normals location. No closer places have figures: these lie 16–40 km from Bostwick.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Bostwick London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 16 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
| Dutton 35 km · New Glasgow | 26.2°C about the same | −7.4°C 1.7°C milder | 927 mm |
| South-West Oxford 40 km · Delhi | 27.5°C 0.9°C warmer | −8.9°C about the same | 965 mm |
Bostwick weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and 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 |
In March, anything from −25.6°C to 27.2°C
February is the least predictable month: about two years in three its average lands within 3.0°C of the normal, −4.8°C. June is the steadiest, within 1.1°C.
Where Bostwick’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: a location missing months of precipitation or snow is filled from the nearest that has them all, never mixed month by month.
- 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 Bostwick’s climate
How warm does Bostwick get in summer?
July is the warmest month, with average highs of 26.6°C.
How cold does Bostwick get in winter?
Midwinter means January, when a typical night reaches −9.1°C.
How much rain and snow does Bostwick get?
Precipitation totals 962 mm a year, with September the wettest month (93 mm) and February the driest (63 mm).
Are these figures for Bostwick itself?
Close to it: they are ECCC’s 1991–2020 normals for London, just outside Bostwick’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Bostwick →
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).