Photo: P199 · Public domainLac Simon has some of the coldest winter nights among Canadian towns
Midsummer highs settle at about 23.8°C. Seasons differ by 46°C, from the coldest nights to the warmest afternoons. By July afternoons alone, it runs cooler than 71% of Canadian towns. For walks and days out, the stretch from June to August brings highs of 22–24°C.
ECCC publishes no normals for Lac Simon itself; the figures are those of Val-d'Or, 33 km west.
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
Each season’s and each month’s usual high and low, 1991–2020.
202 frost days and 86 days above 20°C a year
The frost season runs September to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 57 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 868 mm a year
September brings the most rain and snow; February, the least. About 135 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Heating a home in Lac Simon
88% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. That means homes here need more heating than 98% of Canadian towns.
Living with Lac Simon’s climate
What the normals mean for a garden, a day outside and the depth of winter.
On average the last spring frost comes around 31 May and the first autumn frost around 16 September: about 107 frost-free days between.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jun, Jul and Aug.
Parks & trails →Count on some 85 days a year when the wind makes it feel below −20.
Roughly 19 days a year feel hotter than 30 once humidity is counted.
For the weather that does damage, from ice storms to floods, see Lac Simon’s hazards page.
Flood & hazards →ECCC’s normals location: Val-d'Or
Val-d'Or is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 33 km west |
| Station altitude | 337 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | No location within 100 km |
| Coldest reading, 1991–2020 | −42.7°C |
| Hottest reading, 1991–2020 | 36.1°C |
| Average wind | 12.5 km/h on average, most often from the south |
| Next-nearest location | Rouyn, 126 km |
How Lac Simon 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 Quebec.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Lac Simon’s would only repeat its figures. No closer places have figures: these lie 90–151 km from Lac Simon.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Lac Simon Val-d'Or | 23.8°C | −22.2°C | 868 mm |
| Trécesson 90 km · Rouyn | 23.7°C about the same | −20.1°C 2.1°C milder | 868 mm |
| Lebel-sur-Quévillon 114 km · Matagami | 23.2°C 0.6°C cooler | −23.7°C 1.5°C colder | 868 mm |
Lac Simon weather by month
Each month’s normals, 1991–2020: high, low, mean and precipitation.
| Month | High | Low | Mean | Rain & snow |
|---|---|---|---|---|
| January | −10.4°C | −22.2°C | −16.3°C | 55 mm |
| February | −8.1°C | −21.2°C | −14.7°C | 42 mm |
| March | −1.6°C | −14.7°C | −8.2°C | 47 mm |
| April | 6.7°C | −5.1°C | 0.8°C | 65 mm |
| May | 16.3°C | 2.7°C | 9.5°C | 69 mm |
| June | 22.0°C | 8.5°C | 15.2°C | 84 mm |
| July | 23.8°C | 11.5°C | 17.7°C | 101 mm |
| August | 22.2°C | 10.3°C | 16.3°C | 93 mm |
| September | 17.3°C | 5.9°C | 11.6°C | 102 mm |
| October | 9.0°C | 0.2°C | 4.6°C | 82 mm |
| November | 0.8°C | −7.2°C | −3.2°C | 75 mm |
| December | −6.3°C | −16.0°C | −11.2°C | 54 mm |
| Year | 7.7°C | −4.0°C | 1.9°C | 868 mm |
The most changeable month: January, give or take 3.5°C; the steadiest, July
April has the widest record range, −27.1°C in 2016 to 26.8°C in 2001; the tick on each bar is the month’s normal.
Where Lac Simon’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, Val-d'Or, 1991–2020.
- 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: snowfall (no location within 100 km publishes a full year of it), sunshine (none for 1991–2020) and an altitude correction.
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?
Afternoons average 23.8°C in July, the warmest time of year.
How cold does Lac Simon get in winter?
Of all twelve months, January has the coldest nights, about −22.2°C.
How much rain and snow does Lac Simon get?
868 mm a year counting snow as water. The wettest month is September (102 mm); the driest, February (42 mm).
Are these figures for Lac Simon itself?
No, they come from Val-d'Or; ECCC keeps no 1991–2020 normals in 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).