Calgary, Canada Climate & Monthly Averages
Calgary has a semi-arid climate. July is the hottest month, averaging 74° by day; February is the coldest at 28°.
Winter sets the pace in Calgary
The Calgary year is defined by how long its winter lasts: 7 months average sub-freezing nights, bottoming out in February at 9°F (-13°C). Summer is the short exception, with July reaching 74°F (24°C).
July
74° by day 52° at nightFebruary
28° by day 9° at nightThe cold-weather pattern in numbers
Sunshine averages 9.2 hours a day over the year, peaking in July at 13.5 hours. Warmth peaks in July: highs of 74°F (24°C), lows of 52°F (11°C). February is the coolest month, with highs of 28°F (-2°C) and lows near 9°F (-13°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 98°F (37°C) and the lowest daily minimum -39°F (-39°C). Snow falls on roughly 28 days a year, mostly September through May.
Relative humidity averages 65% across the year, drier than about 79% of the cities we track.
More climate facts for Calgary
- Hottest month: July - highs near 74°F (24°C)
- Coldest month: February - highs near 28°F (-2°C)
- Decade extremes (2015-2024): 98°F (37°C) high · -39°F (-39°C) low
- Wettest month: June (13 rainy days) · Sunniest: July (13.5 h sun/day)
- Climate type: semi-arid
- Annual swing: 25°C between the average warmest and coolest month · day to night: 11°C
- Snow: about 28 days a year
- Months with freezing average lows: 7
- Average humidity: 65%
From snow season to the warmest stretch in Calgary
Spring (March through May)
Through spring, Calgary is brisk and cold: 51°F (10°C) by day, 28°F (-2°C) after dark, and expect showers on roughly 26 days across the season, plus about 9 snowy days. Daylight is generous - around 10.4 hours of sun a day.
Summer (June through August)
Summer settles into easy warmth here - highs near 72°F (22°C), nights near 50°F (10°C), and rain falls on around 33 of the 90 days. Daylight is generous - around 12.7 hours of sun a day.
Fall (September through November)
Fall is brisk and cold here - highs near 51°F (10°C), nights near 31°F (0°C), and expect showers on roughly 20 days across the season, plus about 8 snowy days.
Winter (December through February)
Winter is bitterly cold here - highs near 28°F (-2°C), nights near 10°F (-12°C), and rain comes on about 17 days over the three months, plus about 12 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
The coldest and warmest values in the dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.
Planning around winter in Calgary
The easier weather window
Aim for July to September and May if you get the choice: temperatures sit either side of the peak heat rather than in it, and highs average 69°F (20°C) against roughly 10 wet days a month. For the same question asked the other way round, see where else is warm in July.
Cold-weather packing
Pack for Calgary with a heavy insulated coat, hat and gloves for winter and a compact umbrella or rain shell. Even in July, lows of 52°F (11°C) make an extra layer worth the space.
Monthly highs, lows and seasonal change
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 29° | 11° | 4 | 0.5 in | 6.0 h/day | 8.4 h | 14% | 70% |
| February | 28° | 9° | 7 | 0.9 in | 7.2 h/day | 9.9 h | 23% | 67% |
| March | 40° | 18° | 7 | 0.9 in | 9.1 h/day | 11.7 h | 24% | 65% |
| April | 51° | 28° | 8 | 1.3 in | 10.5 h/day | 13.8 h | 26% | 57% |
| May | 62° | 39° | 10 | 2.3 in | 11.5 h/day | 15.5 h | 33% | 57% |
| June | 69° | 47° | 13 | 3.8 in | 12.8 h/day | 16.5 h | 42% | 61% |
| July | 74° | 52° | 12 | 2.5 in | 13.5 h/day | 16.1 h | 37% | 67% |
| August | 74° | 51° | 9 | 2.4 in | 11.9 h/day | 14.5 h | 29% | 64% |
| September | 64° | 43° | 7 | 1.6 in | 9.6 h/day | 12.5 h | 25% | 65% |
| October | 51° | 31° | 6 | 1.2 in | 7.7 h/day | 10.6 h | 20% | 65% |
| November | 37° | 20° | 6 | 0.9 in | 5.7 h/day | 8.8 h | 20% | 69% |
| December | 27° | 11° | 6 | 0.8 in | 5.2 h/day | 7.9 h | 18% | 70% |
The route from winter to summer, month by month
Each card shows the average high and low. The bar places that month between Calgary's coldest night and warmest afternoon.
January
- Rain
- 4 days
- Sunshine
- 6.0 h
- Daylight
- 8.4 h
- Snow
- 3 days
February
- Rain
- 7 days
- Sunshine
- 7.2 h
- Daylight
- 9.9 h
- Snow
- 5 days
March
- Rain
- 7 days
- Sunshine
- 9.1 h
- Daylight
- 11.7 h
- Snow
- 5 days
April
- Rain
- 8 days
- Sunshine
- 10.5 h
- Daylight
- 13.8 h
- Snow
- 3 days
May
- Rain
- 10 days
- Sunshine
- 11.5 h
- Daylight
- 15.5 h
- Snow
- 1 day
June
- Rain
- 13 days
- Sunshine
- 12.8 h
- Daylight
- 16.5 h
July
- Rain
- 12 days
- Sunshine
- 13.5 h
- Daylight
- 16.1 h
August
- Rain
- 9 days
- Sunshine
- 11.9 h
- Daylight
- 14.5 h
September
- Rain
- 7 days
- Sunshine
- 9.6 h
- Daylight
- 12.5 h
October
- Rain
- 6 days
- Sunshine
- 7.7 h
- Daylight
- 10.6 h
- Snow
- 2 days
November
- Rain
- 6 days
- Sunshine
- 5.7 h
- Daylight
- 8.8 h
- Snow
- 5 days
December
- Rain
- 6 days
- Sunshine
- 5.2 h
- Daylight
- 7.9 h
- Snow
- 4 days
Looking for warmer alternatives? Browse warm places by month, or compare Calgary's coolest part of the year: December, February, January.
Where Calgary sits among other climates
- Calgary averages 40°F (4°C) across the year - cooler than almost every other city we track.
These comparisons use the same ten-year window for every city in the dataset.