Photo: Vintotal · CC BY-SA 3.0January in Saint-Roch-de-l'Achigan bites harder than in 75% of Canadian towns
On a normal July day the thermometer tops out near 26.6°C. Rain and snow together come to more here than on 74% of Canadian towns. A year here swings 43°C from midwinter lows to midsummer highs. Frost comes on about 161 days a year, so leave time to clear the car.
ECCC publishes no normals for Saint-Roch-de-l'Achigan itself; the figures are those of L'Assomption, 13 km east.
A year in Saint-Roch-de-l'Achigan at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Roch-de-l'Achigan’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Roch-de-l'Achigan feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 161 days, 20°C on 119
Frost comes from October to May; in January almost every night freezes. On about 24 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 1,041 mm of rain and snow a year
The most falls in October, the least in February. About 122 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Precipitation and snowfall: Montréal Trudeau (Airport), 44 km away (L'Assomption records no complete year of either).
Snowfall: about 217 cm in a normal year
Snow falls from October to April, most of all in January (about 52 cm).
Snowfall by month
Centimetres
Heating a home in Saint-Roch-de-l'Achigan
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-Roch-de-l'Achigan’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jun, Jul, Aug and Sep.
Parks & trails →Winter brings about 44 days with a wind chill below −20.
On some 49 days a year the humidex climbs past 30.
A normal year has no blizzard, flood or heat wave in it; Saint-Roch-de-l'Achigan’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: L'Assomption
Every temperature, frost, snow and degree-day figure on this page is the 1991–2020 normal ECCC publishes for L'Assomption.
| Distance from the town | 13 km east |
| Station altitude | 21 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Montréal Trudeau (Airport), 44 km |
| Coldest reading, 1991–2020 | −40.0°C |
| Hottest reading, 1991–2020 | 36.2°C |
| Average wind | 10.0 km/h on average, most often from the south-west |
| Next-nearest location | Montréal Trudeau (Airport), 44 km |
How Saint-Roch-de-l'Achigan 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
The nearest places on a normals location of their own: those that share Saint-Roch-de-l'Achigan’s would only repeat its figures. Distances here run 23–28 km: that is how far the nearest places with figures are from Saint-Roch-de-l'Achigan.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Roch-de-l'Achigan L'Assomption | 26.6°C | −16.0°C | 1,041 mm |
| Bois-des-Filion 23 km · Montréal Trudeau (Airport) | 26.7°C about the same | −13.5°C 2.5°C milder | 1,041 mm |
| Sainte-Sophie 27 km · Lachute | 26.5°C about the same | −14.7°C 1.3°C milder | 1,178 mm |
Saint-Roch-de-l'Achigan weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.9°C | −16.0°C | −10.9°C | 86 mm | 52 cm |
| February | −4.0°C | −14.8°C | −9.4°C | 66 mm | 47 cm |
| March | 1.8°C | −8.3°C | −3.2°C | 77 mm | 37 cm |
| April | 10.8°C | 0.1°C | 5.5°C | 90 mm | 15 cm |
| May | 19.2°C | 7.2°C | 13.2°C | 86 mm | 0 cm |
| June | 24.3°C | 12.4°C | 18.4°C | 84 mm | 0 cm |
| July | 26.6°C | 14.8°C | 20.7°C | 91 mm | 0 cm |
| August | 25.5°C | 13.7°C | 19.6°C | 94 mm | 0 cm |
| September | 21.1°C | 9.2°C | 15.2°C | 89 mm | 0 cm |
| October | 13.0°C | 3.2°C | 8.1°C | 103 mm | 1 cm |
| November | 5.4°C | −2.7°C | 1.3°C | 84 mm | 16 cm |
| December | −1.9°C | −10.2°C | −6.1°C | 92 mm | 48 cm |
| Year | 11.3°C | 0.7°C | 6.0°C | 1,041 mm | 217 cm |
January varies most from one year to the next (3.1°C), June least
Bars run from each month’s record low to its record high since 1991. March spans the most, from −29.5°C (1992) to 26.0°C (2012).
Where Saint-Roch-de-l'Achigan’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for L'Assomption from ECCC’s climate data site, the nearest location with every month of temperature.
- Other locations: where a location publishes no full year of precipitation or snowfall, the nearest one that does supplies it, named beside those figures.
- 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: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Saint-Roch-de-l'Achigan’s climate
How warm does Saint-Roch-de-l'Achigan get in summer?
July is the warmest month, with average highs of 26.6°C.
How cold does Saint-Roch-de-l'Achigan get in winter?
The coldest nights come in January, averaging −16.0°C.
How much rain and snow does Saint-Roch-de-l'Achigan get?
Count on roughly 1,041 mm a year, heaviest in October (103 mm) and lightest in February (66 mm).
Are these figures for Saint-Roch-de-l'Achigan itself?
Not exactly. Saint-Roch-de-l'Achigan lacks a normals station, so L'Assomption supplies the figures.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Roch-de-l'Achigan →
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).