Frosty mornings in St. Clair are scarcer than in 92% of Canadian towns
Sunny July days climb to about 25.5°C. The gap between a January night and a July afternoon is 32°C. Plan time outside from June to September, when highs sit at 21–26°C.
Borrowed figures: St. Clair has no normals station, so these come from Burlington Piers, 7.1 km north-east.
A year in St. Clair at a glance
Each month’s typical high and low, in °C.
What stands out about St. Clair’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in St. Clair feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 98 frosts a year
Frost comes from November to April, most of all in January (about 25 nights).
Frost days by month
Average days at 0°C or below
Rain and melted snow: about 902 mm a year
The most falls in July, the least in February. About 114 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Burlington Piers publishes no full year of precipitation, so these figures come from Hamilton, 11 km away.
About 115 cm of snow a year
Expect snow from November to April, with about 32 cm in January, the snowiest month.
Snowfall by month
Centimetres
ECCC’s Burlington Piers normals leave snowfall out; the figures here come from Toronto Pearson (Airport), 51 km away.
Living with St. Clair’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul, Aug and Sep.
Parks & trails →Count on some 10 days a year when the wind makes it feel below −20.
The humidex tops 30 on about 46 days a year: muggy days to plan around.
Bad-weather days, from blizzards to floods, get their own page for St. Clair: the hazards page.
Flood & hazards →ECCC’s normals location: Burlington Piers
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for Burlington Piers.
| Distance from the town | 7.1 km north-east |
| Station altitude | 77 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Precipitation from | Hamilton, 11 km |
| Snowfall from | Toronto Pearson (Airport), 51 km |
| Coldest reading, 1991–2020 | −25.3°C |
| Hottest reading, 1991–2020 | 36.0°C |
| Average wind | 13.3 km/h on average, most often from the west |
| Next-nearest location | Hamilton, 11 km |
How St. Clair 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
Places around St. Clair whose figures come from another normals location. St. Clair has few close neighbours with figures, so the list reaches 24–29 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| St. Clair Burlington Piers | 25.5°C | −6.3°C | 902 mm |
| Grimsby 24 km · Vineland | 27.1°C 1.6°C warmer | −6.8°C 0.5°C colder | 838 mm |
| Six Nations (Part) 40 28 km · Hamilton | 26.6°C 1.1°C warmer | −9.1°C 2.8°C colder | 902 mm |
St. Clair 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 | 0.1°C | −6.3°C | −3.1°C | 73 mm | 32 cm |
| February | 0.7°C | −5.9°C | −2.6°C | 53 mm | 28 cm |
| March | 4.7°C | −1.9°C | 1.4°C | 69 mm | 17 cm |
| April | 10.3°C | 3.3°C | 6.9°C | 81 mm | 5 cm |
| May | 16.7°C | 9.0°C | 12.9°C | 81 mm | under 1 cm |
| June | 22.4°C | 15.1°C | 18.8°C | 78 mm | 0 cm |
| July | 25.5°C | 18.3°C | 21.9°C | 98 mm | 0 cm |
| August | 24.9°C | 18.3°C | 21.6°C | 67 mm | 0 cm |
| September | 21.4°C | 14.6°C | 18.1°C | 74 mm | 0 cm |
| October | 14.8°C | 8.3°C | 11.6°C | 84 mm | under 1 cm |
| November | 8.4°C | 2.7°C | 5.6°C | 78 mm | 9 cm |
| December | 2.9°C | −2.5°C | 0.2°C | 67 mm | 24 cm |
| Year | 12.7°C | 6.1°C | 9.4°C | 902 mm | 115 cm |
In March, anything from −21.2°C to 24.4°C
Bars run from each month’s record low to its record high over 1991–2020; February is the month whose average wanders most from year to year (±2.7°C around −2.6°C), August the one that wanders least (±1.1°C).
Where St. Clair’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Burlington Piers (the closest location with all twelve months of temperatures).
- 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 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 St. Clair’s climate
How warm does St. Clair get in summer?
The warmest month is July, when afternoons average 25.5°C.
How cold does St. Clair get in winter?
Winter bottoms out in January, with lows near −6.3°C.
How much rain and snow does St. Clair get?
A normal year brings 902 mm, snow included as water: July is wettest at 98 mm, February driest at 53 mm.
Are these figures for St. Clair itself?
They are the closest available: the normals for Burlington Piers, since St. Clair has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for St. Clair →
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).