Photo: Benjilafouine · CC BY-SA 4.0Ice on the ground: Lac-Simon sees more frosts than 89% of Canadian towns
High summer brings afternoon highs near 25.3°C. The wettest month is October; the driest is February. Precipitation is plentiful here, more than falls on 88% of Canadian towns. Plan time outside from June to August, when highs sit at 23–25°C.
The nearest ECCC normals location to Lac-Simon is St-Jovite, 45 km north-east, and every figure on this page is its.
A year in Lac-Simon at a glance
Each month’s typical high and low, in °C.
What stands out about Lac-Simon’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Lac-Simon feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 196 frosts and 111 warm days a year
The frost season runs September to May, and January freezes nearly every night. On about 41 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 1,178 mm a year
Some 143 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
ECCC’s St-Jovite normals leave out precipitation and snow; both come from Lachute here, 66 km away.
Snowfall: about 218 cm in a normal year
Snow falls from October to April, most of all in January (about 56 cm).
Snowfall by month
Centimetres
Heating a home in Lac-Simon
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year. Homes here need more heating than 80% of Canadian towns.
Living with Lac-Simon’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
The growing season between frosts lasts about 110 days, roughly 28 May to 15 September.
Highs of 17–27°C with nights of 8°C or more come in Jun, Jul and Aug.
Parks & trails →Bitter wind chill, under −20, comes on about 34 days a year.
Expect around 35 sticky days a year with the humidex above 30.
The normals describe a typical year, not its worst days; the hazards page covers Lac-Simon’s.
Flood & hazards →ECCC’s normals location: St-Jovite
The page’s figures are ECCC’s 1991–2020 normals for St-Jovite, one of its 450 normals locations.
| Distance from the town | 45 km north-east |
| Station altitude | 234 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Precipitation from | Lachute, 66 km |
| Coldest reading, 1991–2020 | −41.4°C |
| Hottest reading, 1991–2020 | 35.7°C |
| Average wind | 4.1 km/h on average, most often from the west |
| Next-nearest location | Angers, 53 km |
How Lac-Simon compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Quebec.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Lac-Simon’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lac-Simon St-Jovite | 25.3°C | −18.3°C | 1,178 mm |
| Montpellier 9.0 km · Angers | 26.2°C 0.9°C warmer | −16.5°C 1.8°C milder | 938 mm |
Lac-Simon 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 | −5.5°C | −18.3°C | −11.9°C | 97 mm | 56 cm |
| February | −3.3°C | −17.9°C | −10.6°C | 72 mm | 47 cm |
| March | 2.6°C | −11.3°C | −4.4°C | 74 mm | 34 cm |
| April | 10.3°C | −3.2°C | 3.5°C | 100 mm | 8 cm |
| May | 18.5°C | 3.3°C | 11.0°C | 89 mm | 0 cm |
| June | 23.0°C | 8.5°C | 15.7°C | 111 mm | 0 cm |
| July | 25.3°C | 10.9°C | 18.2°C | 112 mm | 0 cm |
| August | 24.5°C | 9.8°C | 17.2°C | 104 mm | 0 cm |
| September | 20.1°C | 5.6°C | 12.9°C | 114 mm | 0 cm |
| October | 12.3°C | 0.5°C | 6.4°C | 120 mm | 2 cm |
| November | 4.6°C | −5.1°C | −0.2°C | 93 mm | 17 cm |
| December | −2.5°C | −12.9°C | −7.7°C | 94 mm | 53 cm |
| Year | 10.8°C | −2.5°C | 4.2°C | 1,178 mm | 218 cm |
March has run from −38.3°C to 27.1°C in thirty years
From one year to the next, January’s average typically shifts by 3.2°C around its normal of −11.9°C, the widest of any month, while August’s shifts by 1.0°C.
Where Lac-Simon’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at St-Jovite (the closest location with all twelve months of temperatures).
- Other locations: ECCC blanks a month that fails its completeness rule, so the precipitation or snowfall here comes from the next location with all twelve months.
- Comparisons: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- 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 Lac-Simon’s climate
How warm does Lac-Simon get in summer?
Peak warmth comes in July, at about 25.3°C by mid-afternoon.
How cold does Lac-Simon get in winter?
On a normal January night the air drops to −18.3°C, the coldest of the year.
How much rain and snow does Lac-Simon get?
Rain and snow add up to about 1,178 mm of water a year; October brings the most (120 mm), February the least (72 mm).
Are these figures for Lac-Simon itself?
They describe St-Jovite, the nearest normals location, rather than Lac-Simon itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Lac-Simon →
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).