Frost comes to Westminster less often than to 75% of Canadian towns
The warmest part of a July day comes in at 26.6°C on average. Rain or snow is most frequent in September and least in February. In July, afternoons here are warmer than in 70% of Canadian towns. Homes need heating from October to April, the months averaging under 10°C.
Environment and Climate Change Canada’s 1991–2020 normals at its London station, 11 km north-east.
A year in Westminster at a glance
Each month’s typical high and low, in °C.
What stands out about Westminster’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Westminster feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 139 days, 20°C on 128
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
About 152 cm of snow a 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, 36 km away (London records no complete year of it).
Heating a home in Westminster
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. In heating terms, homes need less heating than 79% of Canadian towns.
Living with Westminster’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.
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 →Count on some 18 days a year when the wind makes it feel below −20.
Roughly 55 days a year feel hotter than 30 once humidity is counted.
Thirty-year normals hide the storms and the extremes: the hazards page has Westminster’s 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 | 11 km north-east |
| Station altitude | 278 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Strathroy-Mullifarry, 36 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, 36 km |
How Westminster 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
Places around Westminster whose figures come from another normals location. Westminster has few close neighbours with figures, so the list reaches 21–39 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Westminster London | 26.6°C | −9.1°C | 962 mm |
| Oneida 41 21 km · Strathroy-Mullifarry | 27.3°C 0.7°C warmer | −8.5°C 0.6°C milder | 966 mm |
| South-West Oxford 35 km · Delhi | 27.5°C 0.9°C warmer | −8.9°C about the same | 965 mm |
| Dutton 39 km · New Glasgow | 26.2°C about the same | −7.4°C 1.7°C milder | 927 mm |
Westminster 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 |
A March here can run from −25.6°C to 27.2°C
Two years in three, February’s average falls within 3.0°C of its normal of −4.8°C; June keeps to within 1.1°C.
Where Westminster’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for London, 1991–2020, chosen as the nearest location with a full temperature record.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- 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 Westminster’s climate
How warm does Westminster get in summer?
The year’s warmest days come in July, with highs averaging 26.6°C.
How cold does Westminster get in winter?
January nights average −9.1°C, the coldest of the year.
How much rain and snow does Westminster get?
Count on roughly 962 mm a year, heaviest in September (93 mm) and lightest in February (63 mm).
Are these figures for Westminster itself?
Close to it: they are ECCC’s 1991–2020 normals for London, just outside Westminster’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Westminster →
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).