Precipitation in Mille-Isles tops that of 88% of Canadian towns: 1,178 mm a year
Midsummer highs settle at about 26.5°C. Some 41°C separates winter nights from summer afternoons. Its January nights bite harder than in 67% of Canadian towns. An umbrella or a shovel earns its place on about 143 days a year with 1 mm or more.
ECCC publishes no normals for Mille-Isles itself; the figures are those of Lachute, 21 km south-west.
A year in Mille-Isles at a glance
Each month’s typical high and low, in °C.
What stands out about Mille-Isles’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Mille-Isles feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
159 frost days and 115 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night. On about 19 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
About 1,178 mm of rain and snow a year
October is the wettest month and February the driest.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 218 cm in a normal year
From October to April snow is likely; January is the peak, at about 56 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Mille-Isles
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Measured against 18°C: each day’s shortfall in mean temperature, added over twelve months.
Living with Mille-Isles’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Gardens get from about 12 May to 3 October without frost, around 143 days in all.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul, Aug and Sep.
Parks & trails →Thirty-year normals hide the storms and the extremes: the hazards page has Mille-Isles’s risks.
Flood & hazards →ECCC’s normals location: Lachute
The page’s figures are ECCC’s 1991–2020 normals for Lachute, one of its 450 normals locations.
| Distance from the town | 21 km south-west |
| Station altitude | 91 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −36.0°C |
| Hottest reading, 1991–2020 | 36.0°C |
| Next-nearest location | St-Jovite, 38 km |
How Mille-Isles 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 Quebec.
Nearby towns’ climate
Places around Mille-Isles whose figures come from another normals location. No closer place has figures: this one lies 16 km from Mille-Isles.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Mille-Isles Lachute | 26.5°C | −14.7°C | 1,178 mm |
| Sainte-Adèle 16 km · St-Jovite | 25.3°C 1.2°C cooler | −18.3°C 3.6°C colder | 1,178 mm |
Mille-Isles 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 | −5.5°C | −14.7°C | −10.2°C | 97 mm | 56 cm |
| February | −3.6°C | −13.6°C | −8.3°C | 72 mm | 47 cm |
| March | 2.4°C | −7.2°C | −2.5°C | 74 mm | 34 cm |
| April | 11.0°C | 0.5°C | 5.9°C | 100 mm | 8 cm |
| May | 19.4°C | 7.4°C | 13.3°C | 89 mm | 0 cm |
| June | 24.1°C | 12.6°C | 18.4°C | 111 mm | 0 cm |
| July | 26.5°C | 15.1°C | 20.5°C | 112 mm | 0 cm |
| August | 25.4°C | 14.3°C | 19.8°C | 104 mm | 0 cm |
| September | 20.8°C | 9.9°C | 15.4°C | 114 mm | 0 cm |
| October | 12.8°C | 3.7°C | 8.4°C | 120 mm | 2 cm |
| November | 5.2°C | −2.3°C | 1.6°C | 93 mm | 17 cm |
| December | −1.9°C | −9.5°C | −6.0°C | 94 mm | 53 cm |
| Year | 11.4°C | 1.4°C | 6.4°C | 1,178 mm | 218 cm |
The month with the widest range: March, −30.5°C to 26.5°C
January is the least predictable month: about two years in three its average lands within 3.2°C of the normal, −10.2°C. August is the steadiest, within 1.0°C.
Where Mille-Isles’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Lachute, the nearest location with a full year of temperatures.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- 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 Mille-Isles’s climate
How warm does Mille-Isles get in summer?
The year’s warmest days come in July, with highs averaging 26.5°C.
How cold does Mille-Isles get in winter?
Of all twelve months, January has the coldest nights, about −14.7°C.
How much rain and snow does Mille-Isles get?
Over twelve months, rain and melted snow come to 1,178 mm; the range runs from 72 mm in February to 120 mm in October.
How long does snow stay on the ground?
Expect snow on the ground, at least 1 cm, for about 128 days a year.
Are these figures for Mille-Isles itself?
No: Mille-Isles has no normals location, so the figures come from Lachute, the nearest with 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mille-Isles →
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).