Dry weather: only 445 mm of rain and snow a year falls on Mission, less than on 82% of Canadian towns
January nights here settle around −13.5°C. Some 37°C separates winter nights from summer afternoons. By July afternoons alone, it runs cooler than 80% of Canadian towns. Warm coats and heating bills mark the months from October to May, when means dip under 10°C.
Environment and Climate Change Canada’s 1991–2020 normals at its Calgary (Airport) station, 11 km north-east.
A year in Mission at a glance
Each month’s typical high and low, in °C.
What stands out about Mission’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Alberta beside it.
What a year in Mission feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
About 193 frosts and 87 warm days a year
Frost comes from September to May; in December almost every night freezes. On about 22 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
Rain and melted snow: about 445 mm a year
June brings the most rain and snow; January, the least. Some 72 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 139 cm in a normal 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 Mission
85% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Every day colder than 18°C on average adds its gap in degrees to the year’s heating total. Over a year, a home here needs more heating than 68% of Canadian towns.
Living with Mission’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Wait until about 21 May to plant out; frost tends to come back around 18 September, about 119 days later.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to Jul and Aug.
Parks & trails →Count on some 42 days a year when the wind makes it feel below −20.
Humid summer days, the humidex above 30, number about 9 a year.
For the weather that does damage, from ice storms to floods, see Mission’s hazards page.
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 | 11 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, 90 km |
How Mission 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 Alberta.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Mission’s own would show the same figures). The nearest places to Mission with figures are 57–72 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Mission Calgary (Airport) | 23.5°C | −13.5°C | 445 mm |
| Stoney 142, 143, 144 57 km · Banff | 22.5°C 1.0°C cooler | −13.5°C about the same | 454 mm |
| Carstairs 58 km · Sundre | 22.8°C 0.7°C cooler | −18.0°C 4.5°C colder | 496 mm |
| Wheatland County 58 km · Queenstown | 25.0°C 1.5°C warmer | −13.7°C about the same | 412 mm |
Mission 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 |
In December, anything from −38.2°C to 19.5°C
February is the least predictable month: about two years in three its average lands within 4.1°C of the normal, −5.9°C. June is the steadiest, within 1.1°C.
Where Mission’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Calgary (Airport), the closest ECCC location with twelve months of temperature normals.
- 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: 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 Mission’s climate
How warm does Mission get in summer?
A normal July afternoon tops out at about 23.5°C, the year’s high point.
How cold does Mission get in winter?
January nights average −13.5°C, the coldest of the year.
How much rain and snow does Mission get?
Count on roughly 445 mm a year, heaviest in June (113 mm) and lightest in January (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 Mission itself?
Almost: ECCC’s Calgary (Airport) location, which gives these figures, lies a short way outside Mission.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Mission →
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).