| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -5.6° | -15° | 70.4mm | 11.1 | 8 |
| February | -3.3° | -13.8° | 44.4mm | 8.2 | 14 |
| March | 2.1° | -7.8° | 62.2mm | 8.3 | 14 |
| April | 10.4° | -0.2° | 85.5mm | 9.8 | 46 |
| May | 18.5° | 6.5° | 86.9mm | 11.2 | 73 |
| June | 23.7° | 12.2° | 101.3mm | 12.7 | 75 |
| July | 25.8° | 14.8° | 90.7mm | 11.8 | 76 |
| August | 24.8° | 13.7° | 71.7mm | 9.2 | 82 |
| September | 20.2° | 9.5° | 102.6mm | 10.8 | 78 |
| October | 12.2° | 3.1° | 104.8mm | 12.7 | 50 |
| November | 4.6° | -2.9° | 78.8mm | 10.5 | 22 |
| December | -1.8° | -9.6° | 80.4mm | 11.6 | 7 |
January in Saint-Jérôme averages a daily high of -5.6°C with nights around -15°C. Expect roughly 11.1 wet days totalling 70.4mm. A hard month to visit for comfort alone.
February in Saint-Jérôme averages a daily high of -3.3°C with nights around -13.8°C. Expect roughly 8.2 wet days totalling 44.4mm. A hard month to visit for comfort alone.
March in Saint-Jérôme averages a daily high of 2.1°C with nights around -7.8°C. Expect roughly 8.3 wet days totalling 62.2mm. A hard month to visit for comfort alone.
April in Saint-Jérôme averages a daily high of 10.4°C with nights around -0.2°C. Expect roughly 9.8 wet days totalling 85.5mm. Demanding conditions — pack for it and plan indoor options.
May in Saint-Jérôme averages a daily high of 18.5°C with nights around 6.5°C. Expect roughly 11.2 wet days totalling 86.9mm. Generally workable, with some weather to plan around.
June in Saint-Jérôme averages a daily high of 23.7°C with nights around 12.2°C. Expect roughly 12.7 wet days totalling 101.3mm. Comfortable conditions for being outdoors all day.
July in Saint-Jérôme averages a daily high of 25.8°C with nights around 14.8°C. Expect roughly 11.8 wet days totalling 90.7mm. Comfortable conditions for being outdoors all day.
August in Saint-Jérôme averages a daily high of 24.8°C with nights around 13.7°C. Expect roughly 9.2 wet days totalling 71.7mm. Comfortable conditions for being outdoors all day.
September in Saint-Jérôme averages a daily high of 20.2°C with nights around 9.5°C. Expect roughly 10.8 wet days totalling 102.6mm. Comfortable conditions for being outdoors all day.
October in Saint-Jérôme averages a daily high of 12.2°C with nights around 3.1°C. Expect roughly 12.7 wet days totalling 104.8mm. Demanding conditions — pack for it and plan indoor options.
November in Saint-Jérôme averages a daily high of 4.6°C with nights around -2.9°C. Expect roughly 10.5 wet days totalling 78.8mm. A hard month to visit for comfort alone.
December in Saint-Jérôme averages a daily high of -1.8°C with nights around -9.6°C. Expect roughly 11.6 wet days totalling 80.4mm. 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-Jérôme peaks at 82.
Based on 30 years of records, June–September scores highest for comfort in Saint-Jérôme, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25.8°C.
October is the wettest, averaging 104.8mm of rain across roughly 12.7 wet days.
January is the coolest month, with average daily highs around -5.6°C.