Nights turn raw in St.-Charles each January, colder than in 82% of Canadian towns
In July the day’s top temperature is typically 25.0°C. Temperatures cover 43°C across the year, low to high. Summers stay cool: July afternoons here are cooler than in 62% of Canadian towns. Frost comes on about 177 days a year, so leave time to clear the car.
No ECCC station in St.-Charles has 1991–2020 normals; the page reads Sudbury, 43 km north-west, instead.
A year in St.-Charles at a glance
Each month’s typical high and low, in °C.
What stands out about St.-Charles’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in St.-Charles feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 177 days, 20°C on 99
Frost comes from September to May; in January almost every night freezes. On about 28 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
912 mm of precipitation in a typical year
September brings the most rain and snow; February, the least. Some 122 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
263 cm of snow in a typical year
Snow falls from October to May, most of all in January (about 64 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in St.-Charles
90% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. Homes here need more heating than 73% of Canadian towns.
Living with St.-Charles’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Seedlings can go out once the average last frost, around 18 May, has passed; autumn’s first, near 1 October, ends a season of about 136 days.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul, Aug and Sep.
Parks & trails →Wind chill falls below −20 on about 66 days a year: cover skin and dress in layers.
Plan shade and water for about 25 days a year above 30 on the humidex.
Averages smooth over blizzards, ice storms, floods and heat waves; St.-Charles’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Sudbury
Behind the 1991–2020 normals for Sudbury are 2 stations, which ECCC combines into one record.
| Distance from the town | 43 km north-west |
| Station altitude | 348 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −38.0°C |
| Hottest reading, 1991–2020 | 35.7°C |
| Average wind | 14.2 km/h on average, most often from the south-west |
| Next-nearest location | North Bay, 76 km |
How St.-Charles 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.-Charles whose figures come from another normals location. The nearest place to St.-Charles with figures is 32 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| St.-Charles Sudbury | 25.0°C | −17.5°C | 912 mm |
| Sturgeon Falls 32 km · North Bay | 24.3°C 0.7°C cooler | −17.3°C about the same | 1,020 mm |
St.-Charles weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −7.8°C | −17.5°C | −12.7°C | 67 mm | 64 cm |
| February | −5.9°C | −16.3°C | −11.1°C | 51 mm | 52 cm |
| March | 0.5°C | −10.2°C | −4.9°C | 58 mm | 33 cm |
| April | 8.6°C | −2.0°C | 3.3°C | 68 mm | 16 cm |
| May | 17.4°C | 5.3°C | 11.4°C | 79 mm | 2 cm |
| June | 22.6°C | 11.0°C | 16.8°C | 77 mm | 0 cm |
| July | 25.0°C | 13.4°C | 19.1°C | 84 mm | 0 cm |
| August | 23.5°C | 12.5°C | 18.0°C | 90 mm | 0 cm |
| September | 18.6°C | 8.1°C | 13.3°C | 103 mm | under 1 cm |
| October | 10.6°C | 1.9°C | 6.2°C | 94 mm | 7 cm |
| November | 2.9°C | −4.4°C | −0.8°C | 75 mm | 30 cm |
| December | −3.9°C | −11.7°C | −7.8°C | 66 mm | 60 cm |
| Year | 9.3°C | −0.8°C | 4.3°C | 912 mm | 263 cm |
January varies most from one year to the next (3.5°C), June least
March has the widest record range, −31.7°C in 2003 to 25.9°C in 2012; the tick on each bar is the month’s normal.
Where St.-Charles’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Sudbury (the closest location with all twelve months of temperatures).
- 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: 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 St.-Charles’s climate
How warm does St.-Charles get in summer?
Summer peaks in July: a typical afternoon reaches 25.0°C.
How cold does St.-Charles get in winter?
On a normal January night the air drops to −17.5°C, the coldest of the year.
How much rain and snow does St.-Charles get?
Around 912 mm a year in all, from 103 mm in September down to 51 mm in February.
How long does snow stay on the ground?
About 131 days a year have 1 cm of snow or more on the ground.
Are these figures for St.-Charles itself?
Not quite: they come from Sudbury, the closest ECCC normals location to St.-Charles.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for St.-Charles →
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).