| 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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 Saint-Laurent 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. Saint-Laurent peaks at 80.
Based on 30 years of records, May–September scores highest for comfort in Saint-Laurent, 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.