Hardly any Canadian towns wake to more frost than South Terwillegar
In July the day’s top temperature is typically 23.0°C. Summers stay cool: July afternoons here are cooler than in 90% of Canadian towns. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 41°C apart. Warm coats and heating bills mark the months from October to April, when means dip under 10°C.
1991–2020 normals from ECCC’s Edmonton (Airport) location, 13 km south.
A year in South Terwillegar at a glance
Each month’s typical high and low, in °C.
What stands out about South Terwillegar’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Alberta beside it.
What a year in South Terwillegar feels like
Each season’s and each month’s usual high and low, 1991–2020.
Frost on 211 days, 20°C on 90
From September to May frost is routine, and in January it comes on almost every night. On about 38 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 434 mm of rain and snow a year
July is the wettest month and February the driest. On about 78 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 127 cm in a normal year
Snow falls from October to May, most of all in January (about 24 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in South Terwillegar
87% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. Homes here need more heating than 93% of Canadian towns.
Living with South Terwillegar’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Plant out after about 27 May; the first frost of autumn usually arrives near 10 September, leaving roughly 105 days without frost.
Afternoons of 17–27°C and nights of at least 8°C arrive in Jul.
Parks & trails →Bitter wind chill, under −20, comes on about 67 days a year.
About 11 days a year feel above 30 on the humidex.
Thirty years of averages say little about one bad storm; South Terwillegar’s hazards page does.
Flood & hazards →ECCC’s normals location: Edmonton (Airport)
ECCC builds the Edmonton (Airport) normals from 3 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 13 km south |
| Station altitude | 723 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −46.1°C |
| Hottest reading, 1991–2020 | 35.6°C |
| Average wind | 12.5 km/h on average, most often from the south |
| Next-nearest location | Edmonton (City), 15 km |
How South Terwillegar 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 Alberta.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share South Terwillegar’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| South Terwillegar Edmonton (Airport) | 23.0°C | −18.1°C | 434 mm |
| Terwillegar Towne 1.4 km · Edmonton (City) | 23.5°C 0.5°C warmer | −14.7°C 3.4°C milder | 423 mm |
| Mactaggart 1.4 km · Edmonton (Airport) | 23.0°C about the same | −18.1°C about the same | 434 mm |
South Terwillegar weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −6.5°C | −18.1°C | −12.3°C | 22 mm | 24 cm |
| February | −4.1°C | −16.6°C | −10.4°C | 12 mm | 14 cm |
| March | 0.5°C | −11.2°C | −5.3°C | 17 mm | 19 cm |
| April | 10.1°C | −3.2°C | 3.5°C | 30 mm | 16 cm |
| May | 17.6°C | 2.7°C | 10.1°C | 47 mm | 6 cm |
| June | 20.7°C | 7.5°C | 14.1°C | 75 mm | under 1 cm |
| July | 23.0°C | 9.4°C | 16.2°C | 87 mm | 0 cm |
| August | 22.4°C | 7.8°C | 15.1°C | 53 mm | under 1 cm |
| September | 17.8°C | 2.8°C | 10.3°C | 35 mm | 1 cm |
| October | 10.0°C | −3.3°C | 3.4°C | 22 mm | 10 cm |
| November | 0.2°C | −10.6°C | −5.2°C | 20 mm | 19 cm |
| December | −5.3°C | −16.7°C | −11.0°C | 15 mm | 16 cm |
| Year | 8.9°C | −4.1°C | 2.4°C | 434 mm | 127 cm |
March: −42.7°C at its coldest, 24.2°C at its warmest
Year to year, February varies most (a standard deviation of 4.3°C around −10.4°C) and June least (0.9°C).
Where South Terwillegar’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Edmonton (Airport) (the closest location with all twelve months of temperatures).
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about South Terwillegar’s climate
How warm does South Terwillegar get in summer?
Midsummer means July, with afternoons near 23.0°C on a typical day.
How cold does South Terwillegar get in winter?
Overnight lows average −18.1°C in January, the coldest month.
How much rain and snow does South Terwillegar get?
July is the wettest month at 87 mm and February the driest at 12 mm, for 434 mm over the year.
How long does snow stay on the ground?
The ground is white, with 1 cm or more, on some 145 days a year.
Are these figures for South Terwillegar itself?
Close to it: they are ECCC’s 1991–2020 normals for Edmonton (Airport), just outside South Terwillegar’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for South Terwillegar →
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).