Climate Insights for Calgary

The climate in Calgary is cool. The average annual temperature is 5°C and approximately 495mm of precipitation falls per year. June is the wettest month, receiving around 92mm of rainfall. Calgary is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are February, December, January, when temperatures can drop to -12°C. Light snow can occur between January and November.

Calgary has a wide annual temperature range, spanning 37°C from the coldest to warmest months. The warmest month is August, when average highs reach 25°C and the mean temperature sits around 17°C. The coldest month is February, when overnight lows fall to -12°C and the daily average is -7°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Calgary is a relatively dry area, receiving approximately 495mm of precipitation annually, which averages out to around 41mm per month. The wettest month is June, averaging 92mm of rainfall. July and May also tend to see above-average precipitation. The driest month is January, with just 13mm. That's 79mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and November, totalling around 6cm annually. November is the snowiest month with approximately 1cm.

Calgary is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently spring in Calgary, which began on March 20, 2026. Calgary is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 25°C, while the coldest stretch bottoms out in February near -12°C. Summer is next, beginning on June 21, 2026 — 10 days from now.

The best time to visit Calgary is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 68mm per month. By contrast, February can be quite cold with temperatures dropping to -12°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Calgary based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.