Less rain and snow fall on Altadore than on 82% of Canadian towns: 445 mm a year
On a normal July day the thermometer tops out near 23.5°C. Precipitation follows the seasons: June brings about 11 times as much as January. Its July afternoons stay fresher than in 80% of Canadian towns. For walks and days out, July and August bring highs of 23–24°C.
Figures: ECCC’s 1991–2020 normals for Calgary (Airport) (13 km north-east).
A year in Altadore at a glance
Each month’s typical high and low, in °C.
What stands out about Altadore’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Alberta beside it.
What a year in Altadore feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 193 frosts and 87 warm days a year
The frost season runs September to May, and December freezes nearly every night. Some 22 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
445 mm of precipitation in a typical year
About 72 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 139 cm of snow a year
From September to May snow is likely; March is the peak, at about 24 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Altadore
85% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year. In heating terms, homes need more heating than 68% of Canadian towns.
Living with Altadore’s climate
What the normals mean for a garden, a day outside and the depth of winter.
The growing season between frosts lasts about 119 days, roughly 21 May to 18 September.
Highs of 17–27°C with nights of 8°C or more come in Jul and Aug.
Parks & trails →About 42 days a year bring a wind chill under −20, when bare skin chills fast.
About 9 days a year turn sultry, with the humidex past 30.
Storms, floods and heat waves sit outside these normals; Altadore’s hazards page covers them.
Flood & hazards →ECCC’s normals location: Calgary (Airport)
Calgary (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 13 km north-east |
| Station altitude | 1,099 m |
| Completeness | at least 20 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −39.7°C |
| Hottest reading, 1991–2020 | 36.5°C |
| Average wind | 13.8 km/h on average, most often from the south |
| Next-nearest location | Queenstown, 91 km |
How Altadore 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
Nearby places read from a different ECCC location (places on Altadore’s own would show the same figures). Distances here run 55–74 km: that is how far the nearest places with figures are from Altadore.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Altadore Calgary (Airport) | 23.5°C | −13.5°C | 445 mm |
| Stoney 142, 143, 144 55 km · Banff | 22.5°C 1.0°C cooler | −13.5°C about the same | 454 mm |
| Carstairs 60 km · Sundre | 22.8°C 0.7°C cooler | −18.0°C 4.5°C colder | 496 mm |
| Wheatland County 61 km · Queenstown | 25.0°C 1.5°C warmer | −13.7°C about the same | 412 mm |
Altadore weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.5°C | −13.5°C | −7.6°C | 10 mm | 17 cm |
| February | 0.1°C | −11.8°C | −5.9°C | 12 mm | 17 cm |
| March | 3.8°C | −8.1°C | −2.2°C | 18 mm | 24 cm |
| April | 10.8°C | −1.9°C | 4.5°C | 30 mm | 23 cm |
| May | 16.4°C | 3.4°C | 9.9°C | 61 mm | 10 cm |
| June | 19.7°C | 7.7°C | 13.7°C | 113 mm | under 1 cm |
| July | 23.5°C | 10.2°C | 16.9°C | 66 mm | 0 cm |
| August | 23.1°C | 9.2°C | 16.2°C | 54 mm | 0 cm |
| September | 18.3°C | 4.7°C | 11.5°C | 37 mm | 2 cm |
| October | 11.1°C | −1.3°C | 4.9°C | 17 mm | 12 cm |
| November | 4.1°C | −7.5°C | −1.7°C | 16 mm | 19 cm |
| December | −0.4°C | −12.1°C | −6.3°C | 13 mm | 16 cm |
| Year | 10.8°C | −1.8°C | 4.5°C | 445 mm | 139 cm |
A February here can run warm or cold, its average moving by about 4.1°C; the steadiest month is June
The thirty-year records stretch furthest in December: a low of −38.2°C in 1996 and a high of 19.5°C in 1999.
Where Altadore’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Calgary (Airport), the nearest location with a full year of temperatures.
- 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, 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 Altadore’s climate
How warm does Altadore get in summer?
The year’s warmest days come in July, with highs averaging 23.5°C.
How cold does Altadore get in winter?
January nights average −13.5°C, the coldest of the year.
How much rain and snow does Altadore get?
The year adds up to 445 mm. June is the peak month (113 mm) and January the low one (10 mm).
How long does snow stay on the ground?
There is 1 cm of snow or more on the ground on roughly 93 days a year.
Are these figures for Altadore itself?
They are the normals for Calgary (Airport), measured just outside Altadore itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Altadore →
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).