| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -5.1° | -13.7° | 52.4mm | 9.1 | 12 |
| February | -2° | -12.5° | 45.6mm | 7.9 | 14 |
| March | 3.4° | -6° | 49.4mm | 7.7 | 19 |
| April | 11.7° | 0.8° | 73.5mm | 9.5 | 53 |
| May | 20.8° | 7.9° | 81.7mm | 10.6 | 79 |
| June | 24.8° | 13.2° | 92.2mm | 11 | 78 |
| July | 27.3° | 15.6° | 108mm | 11.9 | 75 |
| August | 25.8° | 14.2° | 83.3mm | 8.9 | 82 |
| September | 21.9° | 10.3° | 77.1mm | 9.4 | 81 |
| October | 14.2° | 4.4° | 106.5mm | 11.8 | 58 |
| November | 6.6° | -1.7° | 72.3mm | 10.6 | 30 |
| December | -0.2° | -8.1° | 80.5mm | 10.8 | 8 |
January in Brossard averages a daily high of -5.1°C with nights around -13.7°C. Expect roughly 9.1 wet days totalling 52.4mm. A hard month to visit for comfort alone.
February in Brossard averages a daily high of -2°C with nights around -12.5°C. Expect roughly 7.9 wet days totalling 45.6mm. A hard month to visit for comfort alone.
March in Brossard averages a daily high of 3.4°C with nights around -6°C. Expect roughly 7.7 wet days totalling 49.4mm. A hard month to visit for comfort alone.
April in Brossard averages a daily high of 11.7°C with nights around 0.8°C. Expect roughly 9.5 wet days totalling 73.5mm. Demanding conditions — pack for it and plan indoor options.
May in Brossard averages a daily high of 20.8°C with nights around 7.9°C. Expect roughly 10.6 wet days totalling 81.7mm. Comfortable conditions for being outdoors all day.
June in Brossard averages a daily high of 24.8°C with nights around 13.2°C. Expect roughly 11 wet days totalling 92.2mm. Comfortable conditions for being outdoors all day.
July in Brossard averages a daily high of 27.3°C with nights around 15.6°C. Expect roughly 11.9 wet days totalling 108mm. Comfortable conditions for being outdoors all day.
August in Brossard averages a daily high of 25.8°C with nights around 14.2°C. Expect roughly 8.9 wet days totalling 83.3mm. Comfortable conditions for being outdoors all day.
September in Brossard averages a daily high of 21.9°C with nights around 10.3°C. Expect roughly 9.4 wet days totalling 77.1mm. Comfortable conditions for being outdoors all day.
October in Brossard averages a daily high of 14.2°C with nights around 4.4°C. Expect roughly 11.8 wet days totalling 106.5mm. Generally workable, with some weather to plan around.
November in Brossard averages a daily high of 6.6°C with nights around -1.7°C. Expect roughly 10.6 wet days totalling 72.3mm. A hard month to visit for comfort alone.
December in Brossard averages a daily high of -0.2°C with nights around -8.1°C. Expect roughly 10.8 wet days totalling 80.5mm. 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. Brossard peaks at 82.
Based on 30 years of records, May–September scores highest for comfort in Brossard, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27.3°C.
July is the wettest, averaging 108mm of rain across roughly 11.9 wet days.
January is the coolest month, with average daily highs around -5.1°C.