| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -5.5° | -13.9° | 61.9mm | 12.3 | 5 |
| February | -3.7° | -13.2° | 54.3mm | 10.3 | 9 |
| March | 1.4° | -7.2° | 57.2mm | 11.2 | 9 |
| April | 9° | 0.5° | 83.6mm | 11.1 | 40 |
| May | 17.5° | 7.9° | 67.3mm | 10.8 | 70 |
| June | 22.5° | 13.7° | 92.3mm | 11.4 | 77 |
| July | 25.1° | 16.7° | 94.6mm | 11.3 | 77 |
| August | 24.3° | 15.7° | 80.5mm | 9.4 | 81 |
| September | 20° | 11.3° | 75.2mm | 9.3 | 81 |
| October | 12.5° | 5.3° | 93.3mm | 11 | 54 |
| November | 4.9° | -1.2° | 69.3mm | 11.5 | 24 |
| December | -1.8° | -8.4° | 88.1mm | 14.1 | 2 |
January in Trois-Rivières averages a daily high of -5.5°C with nights around -13.9°C. Expect roughly 12.3 wet days totalling 61.9mm. A hard month to visit for comfort alone.
February in Trois-Rivières averages a daily high of -3.7°C with nights around -13.2°C. Expect roughly 10.3 wet days totalling 54.3mm. A hard month to visit for comfort alone.
March in Trois-Rivières averages a daily high of 1.4°C with nights around -7.2°C. Expect roughly 11.2 wet days totalling 57.2mm. A hard month to visit for comfort alone.
April in Trois-Rivières averages a daily high of 9°C with nights around 0.5°C. Expect roughly 11.1 wet days totalling 83.6mm. Demanding conditions — pack for it and plan indoor options.
May in Trois-Rivières averages a daily high of 17.5°C with nights around 7.9°C. Expect roughly 10.8 wet days totalling 67.3mm. Generally workable, with some weather to plan around.
June in Trois-Rivières averages a daily high of 22.5°C with nights around 13.7°C. Expect roughly 11.4 wet days totalling 92.3mm. Comfortable conditions for being outdoors all day.
July in Trois-Rivières averages a daily high of 25.1°C with nights around 16.7°C. Expect roughly 11.3 wet days totalling 94.6mm. Comfortable conditions for being outdoors all day.
August in Trois-Rivières averages a daily high of 24.3°C with nights around 15.7°C. Expect roughly 9.4 wet days totalling 80.5mm. Comfortable conditions for being outdoors all day.
September in Trois-Rivières averages a daily high of 20°C with nights around 11.3°C. Expect roughly 9.3 wet days totalling 75.2mm. Comfortable conditions for being outdoors all day.
October in Trois-Rivières averages a daily high of 12.5°C with nights around 5.3°C. Expect roughly 11 wet days totalling 93.3mm. Demanding conditions — pack for it and plan indoor options.
November in Trois-Rivières averages a daily high of 4.9°C with nights around -1.2°C. Expect roughly 11.5 wet days totalling 69.3mm. A hard month to visit for comfort alone.
December in Trois-Rivières averages a daily high of -1.8°C with nights around -8.4°C. Expect roughly 14.1 wet days totalling 88.1mm. 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. Trois-Rivières peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Trois-Rivières, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 25.1°C.
July is the wettest, averaging 94.6mm of rain across roughly 11.3 wet days.
January is the coolest month, with average daily highs around -5.5°C.