Frosty mornings in Masonville are scarcer than in 75% of Canadian towns
Expect July afternoons of about 26.6°C. September is the wettest month, February the driest. Its July heat outdoes that of 70% of Canadian towns. Wet days, with 1 mm of rain or snow or more, come about 128 times a year.
1991–2020 normals from ECCC’s London location, 11 km east.
A year in Masonville at a glance
Each month’s typical high and low, in °C.
What stands out about Masonville’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Masonville feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 139 frosts and 128 warm days a year
The frost season runs October to May, and January freezes nearly every night. 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
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
London publishes no full year of snowfall, so these figures come from Strathroy-Mullifarry, 31 km away.
Heating a home in Masonville
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. A house here needs less heating than 79% of Canadian towns.
Living with Masonville’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
From about 3 May to 16 October the garden is usually clear of frost, some 165 days.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul, Aug and Sep.
Parks & trails →Bitter wind chill, under −20, comes on about 18 days a year.
Summer brings about 55 days when the humidex passes 30.
Severe weather is a separate story from the averages: see Masonville’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 | 11 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 Masonville 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 Masonville’s own would show the same figures). Masonville has no close neighbour with figures; the nearest is 24 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Masonville London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 24 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
Masonville 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 |
From −25.6°C to 27.2°C: March’s coldest and warmest days since 1991
The month to count on least is February: one year in three its average strays more than 3.0°C from −4.8°C. June moves least, typically by 1.1°C.
Where Masonville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at London, the closest ECCC location with twelve months of temperature normals.
- 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, 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 Masonville’s climate
How warm does Masonville get in summer?
July is the warmest month, with average highs of 26.6°C.
How cold does Masonville get in winter?
The coldest nights come in January, averaging −9.1°C.
How much rain and snow does Masonville get?
Some 962 mm falls in a year. Most of it comes in September (93 mm), the least in February (63 mm).
Are these figures for Masonville itself?
Nearly: London, the location behind them, sits just beyond Masonville’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Masonville →
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).