Photo: Andre Carrotflower · CC BY-SA 4.0Neither notably warm, cold, wet nor dry, Thessalon sits near the middle of Canadian towns
About 915 mm of rain and snow falls in a typical year; July afternoons reach 24.2°C and January nights drop to −14.5°C. Its July afternoons stay fresher than in 69% of Canadian towns. The wettest month is October; the driest is February. Frost comes on about 175 days a year, so leave time to clear the car.
Thessalon has no ECCC normals station nearby: the figures come from Sault Ste Marie, 78 km west, so read them as the wider area’s climate.
A year in Thessalon at a glance
Each month’s typical high and low, in °C.
What stands out about Thessalon’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Thessalon feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
About 175 frosts and 96 warm days a year
Frost comes from September to May; in January almost every night freezes. On about 21 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
Rain and melted snow: about 915 mm a year
On about 131 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
325 cm of snow in a typical year
Expect snow from October to April, with about 84 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 Thessalon
88% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. By this count, homes here need more heating than 61% of Canadian towns.
Living with Thessalon’s climate
What the normals mean for a garden, a day outside and the depth of winter.
A normal year gives the garden about 123 frost-free days, roughly 28 May to 29 September.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →About 39 days a year bring a wind chill under −20, when bare skin chills fast.
Muggy heat with a humidex over 30 arrives on about 31 days a year.
What averages leave out, the floods and ice storms, is on Thessalon’s hazards page.
Flood & hazards →ECCC’s normals location: Sault Ste Marie
Behind the 1991–2020 normals for Sault Ste Marie are 2 stations, which ECCC combines into one record.
| Distance from the town | 78 km west |
| Station altitude | 192 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −37.3°C |
| Hottest reading, 1991–2020 | 34.3°C |
| Average wind | 12.2 km/h on average, most often from the east |
| Next-nearest location | Gore Bay, 87 km |
How Thessalon compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Thessalon’s own would show the same figures). No closer place has figures: this one lies 16 km from Thessalon.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Thessalon Sault Ste Marie | 24.2°C | −14.5°C | 915 mm |
| Huron Shores 16 km · Gore Bay | 24.4°C about the same | −13.6°C 0.9°C milder | 915 mm |
Thessalon 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 | −5.0°C | −14.5°C | −9.8°C | 65 mm | 84 cm |
| February | −4.0°C | −14.7°C | −9.4°C | 46 mm | 59 cm |
| March | 1.4°C | −9.6°C | −4.1°C | 52 mm | 39 cm |
| April | 8.7°C | −2.0°C | 3.4°C | 71 mm | 17 cm |
| May | 16.2°C | 3.5°C | 9.9°C | 69 mm | 1 cm |
| June | 21.8°C | 8.5°C | 15.2°C | 79 mm | 0 cm |
| July | 24.2°C | 11.6°C | 17.9°C | 77 mm | 0 cm |
| August | 23.7°C | 11.5°C | 17.7°C | 78 mm | 0 cm |
| September | 19.4°C | 8.0°C | 13.7°C | 109 mm | under 1 cm |
| October | 11.7°C | 2.7°C | 7.2°C | 111 mm | 5 cm |
| November | 4.8°C | −2.5°C | 1.2°C | 89 mm | 44 cm |
| December | −1.0°C | −8.6°C | −4.8°C | 70 mm | 77 cm |
| Year | 10.2°C | −0.5°C | 4.8°C | 915 mm | 325 cm |
A March here can run from −34.4°C to 26.7°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 (±3.7°C around −9.4°C), August the one that wanders least (±1.2°C).
Where Thessalon’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Sault Ste Marie, 1991–2020, chosen as the nearest location with a full temperature record.
- 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 Thessalon’s climate
How warm does Thessalon get in summer?
A normal July afternoon tops out at about 24.2°C, the year’s high point.
How cold does Thessalon get in winter?
In February, the coldest month, the typical low is −14.7°C.
How much rain and snow does Thessalon get?
Rain and snow, with snow counted as water, total 915 mm a year; October leads with 111 mm and February trails with 46 mm.
How long does snow stay on the ground?
Snow covers the ground, 1 cm or more, on about 129 days a year.
Are these figures for Thessalon itself?
Not really: Sault Ste Marie, the closest location with normals, lies well away from Thessalon.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Thessalon →
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).