Photo: NordSpace · CC BY-SA 4.0St. Lawrence has some of the coolest summers among Canadian towns
Midwinter brings lows of about −6.9°C. Precipitation is plentiful here, more than falls on 96% of Canadian towns. October is the wettest month, June the driest. Long walks are most pleasant from July to September, when afternoons reach 17–20°C.
Figures: ECCC’s 1991–2020 normals at St. Lawrence (1.1 km east).
A year in St. Lawrence at a glance
Each month’s typical high and low, in °C.
What stands out about St. Lawrence’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Newfoundland and Labrador beside it.
What a year in St. Lawrence feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
153 frost days and 35 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 1,505 mm a year
10th wettest of 33 towns of 2,500+ in Newfoundland and Labrador. About 149 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
173 cm of snow in a typical year
The snow season runs November to April; January brings the most, about 54 cm. 31st snowiest of 32 towns of 2,500+ in Newfoundland and Labrador.
Snowfall by month
Centimetres
St. Lawrence publishes no full year of snowfall, so these figures come from Harbour Breton, 70 km away.
Heating a home in St. Lawrence
80% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Think of it as a year’s worth of daily shortfalls below 18°C, added up.
Living with St. Lawrence’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jul, Aug and Sep.
Parks & trails →Wind chill falls below −20 on about 9 days a year: cover skin and dress in layers.
The air feels heavier than 30 on the humidex for about 6 days a year.
A normal year has no blizzard, flood or heat wave in it; St. Lawrence’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: St. Lawrence
St. Lawrence is a composite: ECCC joins 3 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 1.1 km east |
| Station altitude | 49 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Snowfall from | Harbour Breton, 70 km |
| Coldest reading, 1991–2020 | −21.5°C |
| Hottest reading, 1991–2020 | 30.1°C |
| Average wind | 22.2 km/h on average, most often from the west |
| Next-nearest location | Harbour Breton, 70 km |
How St. Lawrence 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 Newfoundland and Labrador.
Nearby towns’ climate
Places around St. Lawrence whose figures come from another normals location. St. Lawrence has few close neighbours with figures, so the list reaches 70–115 km out.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| St. Lawrence | 18.8°C | −6.9°C | 1,505 mm |
| Harbour Breton 70 km · Harbour Breton | 17.3°C 1.5°C cooler | −7.1°C about the same | 1,486 mm |
| Placentia 115 km · Dunville/Argentia | 17.4°C 1.4°C cooler | −5.6°C 1.3°C milder | 1,133 mm |
St. Lawrence weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | 0.1°C | −6.9°C | −3.4°C | 131 mm | 54 cm |
| February | −0.4°C | −7.4°C | −3.9°C | 112 mm | 40 cm |
| March | 1.7°C | −5.2°C | −1.8°C | 117 mm | 24 cm |
| April | 6.1°C | −1.5°C | 2.3°C | 104 mm | 9 cm |
| May | 10.9°C | 2.2°C | 6.6°C | 118 mm | 0 cm |
| June | 14.9°C | 6.3°C | 10.6°C | 103 mm | 0 cm |
| July | 18.8°C | 11.1°C | 15.0°C | 109 mm | 0 cm |
| August | 20.1°C | 12.4°C | 16.2°C | 107 mm | 0 cm |
| September | 17.2°C | 8.9°C | 13.1°C | 132 mm | 0 cm |
| October | 12.1°C | 4.5°C | 8.3°C | 162 mm | under 1 cm |
| November | 7.5°C | 0.8°C | 4.1°C | 153 mm | 7 cm |
| December | 2.9°C | −3.5°C | −0.3°C | 158 mm | 39 cm |
| Year | 9.3°C | 1.8°C | 5.6°C | 1,505 mm | 173 cm |
In June, anything from −10.7°C to 27.8°C
Bars run from each month’s record low to its record high over 1991–2020; February is the month whose average wanders most from year to year (±1.8°C around −3.9°C), August the one that wanders least (±1.0°C).
Where St. Lawrence’s numbers come from
Averages over 30 years, not a forecast.
- Normals: Environment and Climate Change Canada’s 1991–2020 normals, St. Lawrence: the nearest of its locations with every month’s temperatures.
- Other locations: ECCC blanks a month that fails its completeness rule, so the precipitation or snowfall here comes from the next location with all twelve months.
- Comparisons: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- 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 St. Lawrence’s climate
How warm does St. Lawrence get in summer?
Peak warmth comes in August, at about 20.1°C by mid-afternoon.
How cold does St. Lawrence get in winter?
The year’s coldest nights belong to February, at about −7.4°C.
How much rain and snow does St. Lawrence get?
Precipitation totals 1,505 mm a year, with October the wettest month (162 mm) and June the driest (103 mm).
Are these figures for St. Lawrence itself?
Yes: ECCC’s normals station is inside St. Lawrence itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for St. Lawrence →
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).