Photo: JohnHinks · CC BY-SA 3.0Hardly any Canadian towns see fresher July days than Stephenville
The coldest hours of a January night bottom out at −9.0°C on average. The seasons are far apart: from a winter night to a summer afternoon the average spans 31°C. By precipitation alone, it ranks wetter than 93% of Canadian towns. Ice scrapers and block heaters earn their keep on roughly 157 days a year at 0°C or below.
Environment and Climate Change Canada’s 1991–2020 normals, measured at Stephenville, 3.4 km south-east.
A year in Stephenville at a glance
Each month’s typical high and low, in °C.
What stands out about Stephenville’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Newfoundland and Labrador beside it.
What a year in Stephenville feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 157 days, 20°C on 50
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 1,316 mm a year
September brings the most rain and snow; April, the least. Some 174 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
386 cm of snow in a typical year
From October to May snow is likely; January is the peak, at about 107 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Stephenville
84% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C.
Living with Stephenville’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Frost usually lets go around 15 May and returns near 23 October, about 161 days apart.
Plan time outside for Jul and Aug: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →Bitter wind chill, under −20, comes on about 28 days a year.
Expect around 4 sticky days a year with the humidex above 30.
Severe weather is a separate story from the averages: see Stephenville’s hazards page.
Flood & hazards →ECCC’s normals location: Stephenville
Stephenville is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 3.4 km south-east |
| Station altitude | 25 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −28.8°C |
| Hottest reading, 1991–2020 | 30.7°C |
| Average wind | 18.8 km/h on average, most often from the west |
| Next-nearest location | Corner Brook, 64 km |
How Stephenville 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 Newfoundland and Labrador.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Stephenville’s would only repeat its figures. Stephenville has no close neighbour with figures; the nearest is 60 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Stephenville | 20.3°C | −9.0°C | 1,316 mm |
| Humber Arm South 60 km · Corner Brook | 22.8°C 2.5°C warmer | −9.9°C 0.9°C colder | 1,293 mm |
Stephenville 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 | −2.1°C | −9.0°C | −5.6°C | 121 mm | 107 cm |
| February | −2.5°C | −10.2°C | −6.4°C | 107 mm | 97 cm |
| March | 0.7°C | −7.3°C | −3.3°C | 89 mm | 55 cm |
| April | 6.0°C | −1.6°C | 2.2°C | 78 mm | 17 cm |
| May | 11.8°C | 3.0°C | 7.4°C | 100 mm | 3 cm |
| June | 16.6°C | 7.8°C | 12.2°C | 93 mm | 0 cm |
| July | 20.3°C | 12.6°C | 16.5°C | 115 mm | 0 cm |
| August | 21.1°C | 13.1°C | 17.1°C | 117 mm | 0 cm |
| September | 16.9°C | 9.1°C | 13.0°C | 131 mm | 0 cm |
| October | 11.3°C | 4.3°C | 7.8°C | 130 mm | 3 cm |
| November | 5.9°C | 0.0°C | 3.0°C | 119 mm | 24 cm |
| December | 1.0°C | −4.8°C | −1.9°C | 117 mm | 81 cm |
| Year | 8.9°C | 1.4°C | 5.2°C | 1,316 mm | 386 cm |
Two years in three, February’s average lands within 2.6°C of normal, against the steadier August
Bars run from each month’s record low to its record high since 1991. March spans the most, from −24.5°C (1997) to 19.7°C (1999).
Where Stephenville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Stephenville (the closest location with all twelve months of temperatures).
- Comparisons: every place of 2,500+ in Canada but the city hubs and the reserves, each on its nearest ECCC location.
- 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 Stephenville’s climate
How warm does Stephenville get in summer?
At its warmest, in August, the normal high is 21.1°C.
How cold does Stephenville get in winter?
Lows sink to −10.2°C on an average February night.
How much rain and snow does Stephenville get?
Measured as water, a year brings 1,316 mm: 131 mm in September, the wettest month, and 78 mm in April, the driest.
How long does snow stay on the ground?
About 128 days a year have 1 cm of snow or more on the ground.
Are these figures for Stephenville itself?
Yes. They were measured in Stephenville, at ECCC’s own station there.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Stephenville →
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).