| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4° | -11.4° | 80.4mm | 14.6 | 1 |
| February | -2.4° | -10.2° | 71.3mm | 12.6 | 5 |
| March | 3.3° | -4.5° | 86.1mm | 13.1 | 11 |
| April | 11.4° | 2.6° | 99.8mm | 12.2 | 48 |
| May | 19.3° | 9.6° | 84.8mm | 12.1 | 74 |
| June | 24° | 14.8° | 100.2mm | 11.6 | 77 |
| July | 26.5° | 17.7° | 102.1mm | 11.6 | 77 |
| August | 25.6° | 16.9° | 106.3mm | 10.4 | 79 |
| September | 21.5° | 12.7° | 87.9mm | 9.9 | 80 |
| October | 13.6° | 6.2° | 112.3mm | 11.8 | 56 |
| November | 6.1° | -0.2° | 86.9mm | 12.5 | 27 |
| December | -0.5° | -6.8° | 109.9mm | 15.9 | 2 |
January in Montréal averages a daily high of -4°C with nights around -11.4°C. Expect roughly 14.6 wet days totalling 80.4mm. A hard month to visit for comfort alone.
February in Montréal averages a daily high of -2.4°C with nights around -10.2°C. Expect roughly 12.6 wet days totalling 71.3mm. A hard month to visit for comfort alone.
March in Montréal averages a daily high of 3.3°C with nights around -4.5°C. Expect roughly 13.1 wet days totalling 86.1mm. A hard month to visit for comfort alone.
April in Montréal averages a daily high of 11.4°C with nights around 2.6°C. Expect roughly 12.2 wet days totalling 99.8mm. Demanding conditions — pack for it and plan indoor options.
May in Montréal averages a daily high of 19.3°C with nights around 9.6°C. Expect roughly 12.1 wet days totalling 84.8mm. Generally workable, with some weather to plan around.
June in Montréal averages a daily high of 24°C with nights around 14.8°C. Expect roughly 11.6 wet days totalling 100.2mm. Comfortable conditions for being outdoors all day.
July in Montréal averages a daily high of 26.5°C with nights around 17.7°C. Expect roughly 11.6 wet days totalling 102.1mm. Comfortable conditions for being outdoors all day.
August in Montréal averages a daily high of 25.6°C with nights around 16.9°C. Expect roughly 10.4 wet days totalling 106.3mm. Comfortable conditions for being outdoors all day.
September in Montréal averages a daily high of 21.5°C with nights around 12.7°C. Expect roughly 9.9 wet days totalling 87.9mm. Comfortable conditions for being outdoors all day.
October in Montréal averages a daily high of 13.6°C with nights around 6.2°C. Expect roughly 11.8 wet days totalling 112.3mm. Generally workable, with some weather to plan around.
November in Montréal averages a daily high of 6.1°C with nights around -0.2°C. Expect roughly 12.5 wet days totalling 86.9mm. A hard month to visit for comfort alone.
December in Montréal averages a daily high of -0.5°C with nights around -6.8°C. Expect roughly 15.9 wet days totalling 109.9mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Montréal peaks at 80.
Based on 30 years of records, May–September scores highest for comfort in Montréal, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.5°C.
October is the wettest, averaging 112.3mm of rain across roughly 11.8 wet days.
January is the coolest month, with average daily highs around -4°C.