Climate and weather averages
What Calgary's weather is normally like, month by month, from the official Environment Canada climate normals.
A climate normal is a thirty-year average, not a forecast and not last year. Comparing a normal against today’s weather is how you tell whether a day is unusual for the time of year. This page uses the 1981-2010 normals for CALGARY INT'L A (Calgary International Airport).
The year at a glance
Month by month
| Month | Mean °C | Daily high °C | Daily low °C | Rain mm | Snow cm | Precip mm |
|---|---|---|---|---|---|---|
| January | -7.1 | -0.9 | -13.2 | 0 | 15 | 9 |
| February | -5.3 | 0.7 | -11.4 | 0 | 15 | 9 |
| March | -1.6 | 4.4 | -7.5 | 2 | 23 | 18 |
| April | 4.6 | 11.2 | -2.0 | 11 | 19 | 25 |
| May | 9.7 | 16.3 | 3.1 | 46 | 12 | 57 |
| June | 13.7 | 19.8 | 7.5 | 94 | 0 | 94 |
| July | 16.5 | 23.1 | 9.8 | 66 | 0 | 66 |
| August | 15.8 | 22.8 | 8.8 | 57 | 0 | 57 |
| September | 11.0 | 17.8 | 4.1 | 42 | 4 | 45 |
| October | 5.2 | 11.7 | -1.4 | 7 | 10 | 15 |
| November | -2.4 | 3.4 | -8.2 | 1 | 17 | 13 |
| December | -6.8 | -0.8 | -12.8 | 0 | 15 | 10 |
The same station records an average of 2,396 hours of bright sunshine a year, and 112 days a year with measurable precipitation. Sunshine is measured with a recorder rather than estimated from cloud cover, which is why some stations — Halifax among them — do not publish it.
Frost and the growing season
The frost-free period averages 117 days a year at this station. The last frost of spring falls around day 141 of the year and the first frost of autumn around day 259. Days are counted from 1 January.
Official sources
- Canadian Climate Normals 1981-2010 — CALGARY INT'L A
- Environment Canada — current conditions and forecast
Details such as fares, fees, hours and program rules change. Always confirm against the official source before acting on anything time-sensitive.