Climate and weather averages
What Montreal'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 MONTREAL/PIERRE ELLIOTT TRUDEAU INTL A (Montréal–Trudeau 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 | -9.7 | -5.3 | -14.0 | 27 | 50 | 77 |
| February | -7.7 | -3.2 | -12.2 | 21 | 41 | 63 |
| March | -2.0 | 2.5 | -6.5 | 30 | 36 | 69 |
| April | 6.4 | 11.6 | 1.2 | 68 | 13 | 82 |
| May | 13.4 | 18.9 | 7.9 | 81 | 0 | 81 |
| June | 18.6 | 23.9 | 13.2 | 87 | 0 | 87 |
| July | 21.2 | 26.3 | 16.1 | 89 | 0 | 89 |
| August | 20.1 | 25.3 | 14.8 | 94 | 0 | 94 |
| September | 15.5 | 20.6 | 10.3 | 83 | 0 | 83 |
| October | 8.5 | 13.0 | 3.9 | 89 | 2 | 91 |
| November | 2.1 | 5.9 | -1.7 | 77 | 19 | 96 |
| December | -5.4 | -1.4 | -9.3 | 39 | 49 | 87 |
The same station records an average of 2,051 hours of bright sunshine a year, and 163 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is measured with a recorder rather than estimated from cloud cover, which is why some stations — Halifax among them — do not publish it.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 165 days a year at this station. The last frost of spring falls around day 119 of the year and the first frost of autumn around day 285. Days are counted from 1 January.
Official sources
- Canadian Climate Normals 1981-2010 — MONTREAL/PIERRE ELLIOTT TRUDEAU INTL 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.