Saint-Guillaume is wetter than 82% of Canadian towns: 1,109 mm of rain and snow a year
Midwinter brings lows of about −14.8°C. Of all months, August brings the most precipitation and February the least. By January nights alone, it runs colder than 71% of Canadian towns. Have the furnace checked before October to April, the months that average under 10°C.
The nearest ECCC normals location to Saint-Guillaume is Fleury, 20 km south-west, and every figure on this page is its.
A year in Saint-Guillaume at a glance
Each month’s typical high and low, in °C.
What stands out about Saint-Guillaume’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Saint-Guillaume feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 161 days, 20°C on 115
From September to May frost is routine, and in January it comes on almost every night. Some 20 nights a year drop under −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 1,109 mm a year
Some 145 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 202 cm in a normal year
Snow falls from October to April, most of all in December (about 49 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Saint-Guillaume
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Think of it as a year’s worth of daily shortfalls below 18°C, added up.
Living with Saint-Guillaume’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Count on about 136 frost-free days: the last frost averages 12 May, the first 27 September.
Plan time outside for Jun, Jul, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →A normal year has no blizzard, flood or heat wave in it; Saint-Guillaume’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: Fleury
The page’s figures are ECCC’s 1991–2020 normals for Fleury, one of its 450 normals locations.
| Distance from the town | 20 km south-west |
| Station altitude | 31 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −39.0°C |
| Hottest reading, 1991–2020 | 35.1°C |
| Next-nearest location | Drummondville, 23 km |
How Saint-Guillaume 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
The nearest places on a normals location of their own: those that share Saint-Guillaume’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Saint-Guillaume Fleury | 26.0°C | −14.8°C | 1,109 mm |
| Saint-Bonaventure 9.4 km · Drummondville | 26.0°C about the same | −14.2°C 0.6°C milder | 1,070 mm |
| Saint-Hugues 13 km · Fleury | 26.0°C about the same | −14.8°C about the same | 1,109 mm |
Saint-Guillaume 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 | −5.8°C | −14.8°C | −10.5°C | 81 mm | 45 cm |
| February | −3.8°C | −13.6°C | −8.6°C | 61 mm | 43 cm |
| March | 1.8°C | −7.3°C | −2.7°C | 71 mm | 38 cm |
| April | 10.5°C | 0.6°C | 5.8°C | 96 mm | 13 cm |
| May | 19.1°C | 7.4°C | 13.2°C | 98 mm | under 1 cm |
| June | 23.9°C | 12.7°C | 18.4°C | 102 mm | 0 cm |
| July | 26.0°C | 14.9°C | 20.2°C | 106 mm | 0 cm |
| August | 25.0°C | 13.7°C | 19.3°C | 114 mm | 0 cm |
| September | 20.7°C | 9.4°C | 15.1°C | 97 mm | 0 cm |
| October | 13.0°C | 3.6°C | 8.4°C | 108 mm | 2 cm |
| November | 5.5°C | −2.0°C | 1.9°C | 90 mm | 12 cm |
| December | −2.0°C | −9.3°C | −5.9°C | 85 mm | 49 cm |
| Year | 11.2°C | 1.3°C | 6.2°C | 1,109 mm | 202 cm |
January strays furthest from its normal year to year, by 3.1°C; August the least
Over 1991–2020, March saw both −31.0°C (1992) and 25.5°C (2012), the widest span of any month.
Where Saint-Guillaume’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the closest ECCC location with twelve months of temperature normals, Fleury, 1991–2020.
- 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-Guillaume’s climate
How warm does Saint-Guillaume get in summer?
Midsummer means July, with afternoons near 26.0°C on a typical day.
How cold does Saint-Guillaume get in winter?
Overnight lows average −14.8°C in January, the coldest month.
How much rain and snow does Saint-Guillaume get?
Around 1,109 mm a year in all, from 114 mm in August down to 61 mm in February.
How long does snow stay on the ground?
The ground is white, with 1 cm or more, on some 106 days a year.
Are these figures for Saint-Guillaume itself?
They are borrowed from Fleury, the nearest place to Saint-Guillaume where ECCC publishes 1991–2020 normals.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Saint-Guillaume →
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).