Photo: Royalbroil · CC BY-SA 4.0Dry weather: only 445 mm of rain and snow a year falls on Black Diamond, less than on 82% of Canadian towns
January nights here settle around −13.5°C. Summers stay cool: July afternoons here are cooler than in 80% of Canadian towns. Temperatures cover 37°C across the year, low to high. The heating season runs October to May: each of those months averages under 10°C.
The nearest ECCC normals location is Calgary (Airport), 51 km north: at that distance its figures describe the region more than Black Diamond itself.
A year in Black Diamond at a glance
Each month’s typical high and low, in °C.
What stands out about Black Diamond’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Alberta beside it.
What a year in Black Diamond feels like
Each season’s and each month’s usual high and low, 1991–2020.
About 193 frosts and 87 warm days a year
From September to May frost is routine, and in December it comes on almost 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
Rain and melted snow: about 445 mm a year
June brings the most rain and snow; January, the least. About 72 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
139 cm of snow in a typical year
The snow season runs September to May; March brings the most, about 24 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Black Diamond
85% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. By this count, homes here need more heating than 68% of Canadian towns.
Living with Black Diamond’s climate
What the normals mean for a garden, a day outside and the depth of winter.
A normal year gives the garden about 119 frost-free days, roughly 21 May to 18 September.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jul and Aug.
Parks & trails →About 42 days a year bring a wind chill under −20, when bare skin chills fast.
Summer brings about 9 days when the humidex passes 30.
Ice storms, floods and heat waves are risks, not averages: they are on Black Diamond’s hazards page.
Flood & hazards →ECCC’s normals location: Calgary (Airport)
Behind the 1991–2020 normals for Calgary (Airport) are 2 stations, which ECCC combines into one record.
| Distance from the town | 51 km north |
| 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 | Claresholm, 87 km |
How Black Diamond compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Alberta.
Nearby towns’ climate
Places around Black Diamond whose figures come from another normals location. The nearest places to Black Diamond with figures are 50–78 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Black Diamond Calgary (Airport) | 23.5°C | −13.5°C | 445 mm |
| Nanton 50 km · Claresholm | 25.2°C 1.7°C warmer | −13.2°C about the same | 428 mm |
| Stoney 142, 143, 144 69 km · Banff | 22.5°C 1.0°C cooler | −13.5°C about the same | 454 mm |
| Vulcan 75 km · Queenstown | 25.0°C 1.5°C warmer | −13.7°C about the same | 412 mm |
Black Diamond weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the 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 |
December has run from −38.2°C to 19.5°C in thirty years
The month to count on least is February: one year in three its average strays more than 4.1°C from −5.9°C. June moves least, typically by 1.1°C.
Where Black Diamond’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: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- Not on this page: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Black Diamond’s climate
How warm does Black Diamond get in summer?
The year’s warmest days come in July, with highs averaging 23.5°C.
How cold does Black Diamond get in winter?
Winter bottoms out in January, with lows near −13.5°C.
How much rain and snow does Black Diamond get?
The yearly total is about 445 mm. June gets 113 mm, the most of any month; January gets 10 mm, the least.
How long does snow stay on the ground?
Snow lies on the ground for about 93 days in a normal year.
Are these figures for Black Diamond itself?
They are the figures for Calgary (Airport), which read better as the region’s climate than Black Diamond’s own.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Black Diamond →
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).