Climate averages 1991–2020
Calgary weather
in December.
A freezing month with very little precipitation: the 11th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a freezing month in Calgary: daytime highs average -2.8°C and nights cool to about -12.5°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 14 mm of precipitation on roughly 4 days, which makes December a month with very little precipitation (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 00 min on an average December day.
The nearest other city in this atlas is Airdrie (28 km away). In December its highs average -3.3°C, 0.5°C cooler than Calgary, with 14 mm of precipitation.
Among the 86 cities listed in Canada, Calgary ranks 73rd of 86 for the warmest December highs and joint 2nd of 86 for the driest December (precipitation, lowest first). The mean December high of those 86 cities is 0.2°C; Calgary is 3.0°C cooler than that mean.
From December to January, average highs fall by 0.1°C to -2.9°C, and monthly precipitation falls from 14 mm to 12 mm.
The annual picture
December in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Calgary climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.9°C-13.1°C | -13.1°C | 12 | 3.7 | 8.58 h |
| February | 0.0°C-11.4°C | -11.4°C | 12 | 3.7 | 10.010 h |
| March | 4.2°C-7.6°C | -7.6°C | 21 | 5.5 | 11.812 h |
| April | 10.1°C-2.2°C | -2.2°C | 38 | 8.0 | 13.814 h |
| May | 15.7°C3.0°C | 3.0°C | 72 | 11.3 | 15.516 h |
| June | 19.1°C7.8°C | 7.8°C | 104 | 13.7 | 16.516 h |
| July | 22.7°C10.8°C | 10.8°C | 61 | 10.8 | 16.116 h |
| August | 22.3°C10.1°C | 10.1°C | 63 | 9.5 | 14.615 h |
| September | 17.5°C5.6°C | 5.6°C | 44 | 7.9 | 12.713 h |
| October | 10.2°C-0.7°C | -0.7°C | 24 | 6.2 | 10.811 h |
| November | 2.1°C-7.1°C | -7.1°C | 19 | 4.9 | 9.09 h |
| December, selected | -2.8°C-12.5°C | -12.5°C | 14 | 3.7 | 8.08 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Airdrie in DecemberCanada · 28 kmHigh -3.3°C · Low -12.2°C · 14 mm precipitation
- Red Deer in DecemberCanada · 137 kmHigh -5.1°C · Low -14.2°C · 15 mm precipitation
- Lethbridge in DecemberCanada · 175 kmHigh -0.6°C · Low -8.4°C · 16 mm precipitation
- Sherwood Park in DecemberCanada · 279 kmHigh -7.1°C · Low -15.2°C · 14 mm precipitation
- Edmonton in DecemberCanada · 281 kmHigh -6.7°C · Low -15.0°C · 14 mm precipitation
- Kelowna in DecemberCanada · 404 kmHigh 1.3°C · Low -3.1°C · 66 mm precipitation
- Spokane Valley in DecemberUnited States · 439 kmHigh 1.7°C · Low -4.3°C · 85 mm precipitation
- Kamloops in DecemberCanada · 440 kmHigh -0.7°C · Low -5.6°C · 47 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Calgary) is explained once on the Calgary year overview and on the Sources, method and limits page.