Calgary weather in December
December is one of the least pleasant months in Calgary: highs of -4°C (26°F) and about 21 mm (0.8 in) of rain on average. Nights average -12°C (11°F) and cloud cover 68% (NASA POWER, 2001–2025 averages). It is the 2nd driest month of the year and the coolest. Compared with November, it is cooler and about as wet; January brings highs of -3°C (27°F) and 17 mm (0.7 in) of rain.
Is December a good time to visit Calgary?
least pleasant month Weather score 43/100.
December is one of the least pleasant months for weather in Calgary. For better conditions, consider Jul–Sep.
Does it rain a lot in Calgary in December?
No, it is usually dry: about 21 mm (0.8 in) falls in an average December. It is the 2nd driest month of the year.
How warm is Calgary in December?
Days average -4°C (26°F) and nights -12°C (11°F).
Calgary weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | -3°C (27°F) | -11°C (11°F) | 17 mm | 70% | least pleasant |
| February | -2°C (29°F) | -12°C (10°F) | 21 mm | 69% | least pleasant |
| March | 3°C (37°F) | -8°C (17°F) | 26 mm | 72% | least pleasant |
| April | 9°C (47°F) | -3°C (26°F) | 46 mm | 72% | least pleasant |
| May | 15°C (59°F) | 2°C (36°F) | 73 mm | 70% | fair |
| June | 19°C (66°F) | 7°C (44°F) | 115 mm | 70% | fair |
| July | 24°C (74°F) | 10°C (50°F) | 58 mm | 56% | best |
| August | 22°C (72°F) | 9°C (47°F) | 61 mm | 56% | best |
| September | 17°C (62°F) | 4°C (39°F) | 53 mm | 62% | best |
| October | 9°C (48°F) | -2°C (28°F) | 32 mm | 68% | least pleasant |
| November | 1°C (34°F) | -7°C (19°F) | 23 mm | 71% | least pleasant |
| December | -4°C (26°F) | -12°C (11°F) | 21 mm | 68% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months