Calgary climate
Calgary (Alberta, Canada) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 5 °C41 °F, and about 546 mm21 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Calgary climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | −130 | −1014 | −622 | 170.7 |
| Feb | 032 | −1013 | −522 | 200.8 |
| Mar | 540 | −720 | −130 | 261.0 |
| Apr | 1050 | −229 | 440 | 461.8 |
| May | 1762 | 439 | 1050 | 742.9 |
| Jun | 2069 | 847 | 1458 | 1154.5 |
| Jul | 2577 | 1153 | 1865 | 582.3 |
| Aug | 2475 | 1050 | 1763 | 612.4 |
| Sep | 1865 | 542 | 1253 | 532.1 |
| Oct | 1151 | −131 | 541 | 321.3 |
| Nov | 337 | −622 | −130 | 230.9 |
| Dec | −228 | −1013 | −621 | 210.8 |
| Year | 2577 | −1013 | 541 | 54621 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 83% | 70% | 1.2 | 8:23 |
| Feb | 79% | 69% | 2.2 | 9:55 |
| Mar | 72% | 72% | 3.5 | 11:43 |
| Apr | 66% | 72% | 4.5 | 13:46 |
| May | 64% | 70% | 5.3 | 15:31 |
| Jun | 67% | 70% | 5.8 | 16:31 |
| Jul | 62% | 56% | 6.3 | 16:07 |
| Aug | 63% | 56% | 5.2 | 14:33 |
| Sep | 67% | 62% | 3.6 | 12:33 |
| Oct | 72% | 68% | 2.3 | 10:34 |
| Nov | 77% | 71% | 1.2 | 8:49 |
| Dec | 82% | 68% | 0.9 | 7:56 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Calgary is like
The warmest month is July, with an average high of 25 °C77 °F and a low of 11 °C53 °F. The coldest is December, when highs average −2 °C28 °F and lows −10 °C13 °F. Seasons are strongly marked: the warmest month is on average 24.5 °C44.1 °F warmer than the coldest.
Annual precipitation is moderate at about 546 mm21 in. The wettest three-month stretch is May–July, which brings 45% of the annual total. Months with less than 20 mm0.8 in on average: January. The wettest month is June (115 mm4.5 in), the driest is January (17 mm0.7 in).
Relative humidity ranges from 62% in July to 83% in January. The clearest skies (lowest average cloud amount, 56%) are typical of July. Average wind speed near the ground ranges from 3 km/h (2 mph) in August to 6 km/h (4 mph) in January. Daylight lasts from about 7.9 hours in December to 16.5 hours in June.
A lasting snow cover is typical in October–April, when the average snow depth in the reanalysis exceeds 10 cm (deepest in December, about 17 cm).
Best time to visit Calgary
Based on these averages, the most comfortable months for sightseeing and outdoor activities are July–September: average highs of 18 °C65 °F to 25 °C77 °F with 53 mm2.1 in to 61 mm2.4 in of precipitation per month.
The most challenging month is December, which is cold, with average highs of −2 °C28 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Calgary
- Winter (December–February) — highs −228 to 0 °C32 °F, lows around −10 °C13 °F, about 20 mm0.8 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 540 to 17 °C62 °F, lows −720 to 4 °C39 °F, about 49 mm1.9 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Summer (June–August) — highs 2069 to 25 °C77 °F, lows 847 to 11 °C53 °F, about 78 mm3.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 337 to 18 °C65 °F, lows −622 to 5 °C42 °F, about 36 mm1.4 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
How Calgary compares
Of the 40 places in Canada covered by World Climates, Calgary is the 30th warmest by annual mean temperature and the 33rd wettest by annual precipitation. See all of them on the Canada climate page.
Places in other countries with the most similar temperature and rainfall pattern: Minsk (Belarus, Dfb), Lahti (Finland, Dfb) and Uppsala (Sweden, Dfb).
Nearby places
- Red Deer 137 km · 4 °C39 °F · 531 mm21 in
- Lethbridge 175 km · 7 °C44 °F · 492 mm19 in
- Edmonton 281 km · 4 °C39 °F · 520 mm20 in
- Kelowna 404 km · 9 °C49 °F · 451 mm18 in
- Kamloops 440 km · 9 °C48 °F · 446 mm18 in
- Spokane 448 km · 9 °C49 °F · 552 mm22 in
- Saskatoon 526 km · 4 °C39 °F · 455 mm18 in
- Chilliwack 599 km · 11 °C51 °F · 1,815 mm71 in
Frequently asked questions
What is the warmest month in Calgary?
July is the warmest month in Calgary, with an average high of 25 °C (77 °F) and an average low of 11 °C (53 °F).
What is the coldest month in Calgary?
December is the coldest month, with an average high of -2 °C (28 °F) and an average low of -10 °C (13 °F).
When does it rain the most in Calgary?
June is the wettest month with about 115 mm (4.5 in) of precipitation; January is the driest with about 17 mm (0.7 in).
What is the best time to visit Calgary?
Judging by long-term averages, the most comfortable months are July–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 1,290 m, while Calgary lies at about 1,048 m. Temperatures on this page were therefore adjusted by +1.6 °C2.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.