Britannia has warmer summer afternoons than 95% of Canadian towns
The coldest hours of a January night bottom out at −8.9°C on average. Some 36°C separates winter nights from summer afternoons. Only about 131 nights a year bring a frost, fewer than in 82% of Canadian towns. Plan for rain or snow on about 106 days a year, the days with 1 mm or more.
The nearest ECCC normals location to Britannia is Toronto Pearson (Airport), 8.9 km north-east, and every figure on this page is its.
A year in Britannia at a glance
Each month’s typical high and low, in °C.
What stands out about Britannia’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Britannia feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 131 days, 20°C on 125
The frost season runs October to April, and January freezes nearly every night. Heat of 30°C or more comes on about 17 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 807 mm of rain and snow a year
The most falls in June, the least in February.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 115 cm in a normal year
Expect snow from November to April, with about 32 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Britannia
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C. A house here needs less heating than 83% of Canadian towns.
Living with Britannia’s climate
What the normals mean for a garden, a day outside and the depth of winter.
About 174 days a year pass without frost, from an average last frost of 27 April to a first of 20 October.
Plan time outside for May, Jun, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →The wind chill passes −20 on about 21 days in a normal year.
Summer brings about 56 days when the humidex passes 30.
For the weather that does damage, from ice storms to floods, see Britannia’s hazards page.
Flood & hazards →ECCC’s normals location: Toronto Pearson (Airport)
Toronto Pearson (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 8.9 km north-east |
| Station altitude | 173 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −31.0°C |
| Hottest reading, 1991–2020 | 37.9°C |
| Average wind | 15.7 km/h on average, most often from the west |
| Next-nearest location | Toronto (Island), 23 km |
How Britannia 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 Britannia whose figures come from another normals location. No closer places have figures: these lie 17–29 km from Britannia.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Britannia Toronto Pearson (Airport) | 27.4°C | −8.9°C | 807 mm |
| Oakville 17 km · Burlington Piers | 25.5°C 1.9°C cooler | −6.3°C 2.6°C milder | 807 mm |
| Toronto 26 km · Toronto (City) | 27.0°C about the same | −6.7°C 2.2°C milder | 823 mm |
| Vaughan 28 km · Toronto Buttonville (Airport) | 27.3°C about the same | −10.1°C 1.2°C colder | 862 mm |
Britannia weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.2°C | −8.9°C | −5.0°C | 62 mm | 32 cm |
| February | −0.3°C | −8.5°C | −4.4°C | 50 mm | 28 cm |
| March | 5.0°C | −3.8°C | 0.6°C | 51 mm | 17 cm |
| April | 12.0°C | 1.9°C | 7.0°C | 77 mm | 5 cm |
| May | 19.2°C | 8.2°C | 13.7°C | 78 mm | under 1 cm |
| June | 24.5°C | 13.9°C | 19.2°C | 81 mm | 0 cm |
| July | 27.4°C | 16.6°C | 22.1°C | 74 mm | 0 cm |
| August | 26.3°C | 15.8°C | 21.1°C | 69 mm | 0 cm |
| September | 22.3°C | 11.6°C | 16.9°C | 69 mm | 0 cm |
| October | 14.6°C | 5.3°C | 10.0°C | 67 mm | under 1 cm |
| November | 7.9°C | 0.2°C | 4.1°C | 72 mm | 9 cm |
| December | 1.9°C | −5.0°C | −1.6°C | 59 mm | 24 cm |
| Year | 13.3°C | 3.9°C | 8.6°C | 807 mm | 115 cm |
From −24.7°C to 26.0°C: March’s coldest and warmest days since 1991
Year to year, January varies most (a standard deviation of 3.0°C around −5.0°C) and June least (1.3°C).
Where Britannia’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Toronto Pearson (Airport), 1991–2020, chosen as the nearest location with a full temperature record.
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- 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 Britannia’s climate
How warm does Britannia get in summer?
The year’s warmest days come in July, with highs averaging 27.4°C.
How cold does Britannia get in winter?
At its coldest, in January, the normal low is −8.9°C.
How much rain and snow does Britannia get?
Around 807 mm a year in all, from 81 mm in June down to 50 mm in February.
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 69 days a year.
Are these figures for Britannia itself?
Not exactly. Britannia lacks a normals station, so Toronto Pearson (Airport) supplies the figures.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Britannia →
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).