Photo: Andre Carrotflower · CC BY-SA 4.0More rain and snow fall on Saint-Jérôme than on 88% of Canadian towns: 1,178 mm a year
In July the day’s top temperature is typically 26.5°C. In January, nights here are colder than in 67% of Canadian towns. The wettest month is October; the driest is February. Comfortable outdoor weather lasts from June to September, with highs of 21–27°C.
Saint-Jérôme has no ECCC normals station of its own: every figure here comes from Lachute, 29 km south-west.
A year in Saint-Jérôme at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Jérôme’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Jérôme feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 159 frosts and 115 warm days a year
From October to May frost is routine, and in January it comes on almost every night. Deep cold, under −20°C, comes on about 19 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 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
Snowfall: about 218 cm in a normal year
The snow season runs October to April; January brings the most, about 56 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Jérôme
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 Saint-Jérôme’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Between the last frost, near 12 May, and the first, near 3 October, lie about 143 frost-free days.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul, Aug and Sep.
Parks & trails →A typical year is calm by definition; Saint-Jérôme’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: Lachute
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for Lachute.
| Distance from the town | 29 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 | Montréal Trudeau (Airport), 41 km |
How Saint-Jérôme 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
Nearby places read from a different ECCC location (places on Saint-Jérôme’s own would show the same figures). The nearest places to Saint-Jérôme with figures are 14–21 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Jérôme Lachute | 26.5°C | −14.7°C | 1,178 mm |
| Mirabel 14 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C 1.2°C milder | 1,041 mm |
| Sainte-Anne-des-Plaines 16 km · L'Assomption | 26.6°C about the same | −16.0°C 1.3°C colder | 1,041 mm |
Saint-Jérôme 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 | −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 |
A March here can run from −30.5°C to 26.5°C
Two years in three, January’s average falls within 3.2°C of its normal of −10.2°C; August keeps to within 1.0°C.
Where Saint-Jérôme’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: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Jérôme’s climate
How warm does Saint-Jérôme get in summer?
Afternoons average 26.5°C in July, the warmest time of year.
How cold does Saint-Jérôme get in winter?
Deep winter means January, when nights average −14.7°C.
How much rain and snow does Saint-Jérôme get?
Count on roughly 1,178 mm a year, heaviest in October (120 mm) and lightest in February (72 mm).
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 128 days a year.
Are these figures for Saint-Jérôme itself?
Not as such: Lachute is the nearest normals location, and Saint-Jérôme has none.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Jérôme →
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).