| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4.6° | -13.5° | 66.9mm | 13.7 | 3 |
| February | -2.8° | -12.5° | 70.7mm | 11.8 | 6 |
| March | 2.7° | -6.5° | 70.8mm | 12.4 | 7 |
| April | 11.2° | 1° | 83.3mm | 11.6 | 47 |
| May | 19.3° | 7.9° | 68.3mm | 10.5 | 77 |
| June | 24.1° | 13.3° | 91mm | 11.1 | 78 |
| July | 26.3° | 16° | 89.9mm | 10.6 | 79 |
| August | 25.5° | 14.7° | 81.9mm | 9.1 | 82 |
| September | 21.3° | 10.4° | 74.9mm | 9.9 | 80 |
| October | 13.7° | 4.5° | 88.3mm | 10.9 | 58 |
| November | 5.9° | -1.9° | 75.4mm | 11.5 | 26 |
| December | -1.2° | -8.5° | 84mm | 14.6 | 1 |
January in Pierrefonds averages a daily high of -4.6°C with nights around -13.5°C. Expect roughly 13.7 wet days totalling 66.9mm. A hard month to visit for comfort alone.
February in Pierrefonds averages a daily high of -2.8°C with nights around -12.5°C. Expect roughly 11.8 wet days totalling 70.7mm. A hard month to visit for comfort alone.
March in Pierrefonds averages a daily high of 2.7°C with nights around -6.5°C. Expect roughly 12.4 wet days totalling 70.8mm. A hard month to visit for comfort alone.
April in Pierrefonds averages a daily high of 11.2°C with nights around 1°C. Expect roughly 11.6 wet days totalling 83.3mm. Demanding conditions — pack for it and plan indoor options.
May in Pierrefonds averages a daily high of 19.3°C with nights around 7.9°C. Expect roughly 10.5 wet days totalling 68.3mm. Comfortable conditions for being outdoors all day.
June in Pierrefonds averages a daily high of 24.1°C with nights around 13.3°C. Expect roughly 11.1 wet days totalling 91mm. Comfortable conditions for being outdoors all day.
July in Pierrefonds averages a daily high of 26.3°C with nights around 16°C. Expect roughly 10.6 wet days totalling 89.9mm. Comfortable conditions for being outdoors all day.
August in Pierrefonds averages a daily high of 25.5°C with nights around 14.7°C. Expect roughly 9.1 wet days totalling 81.9mm. Comfortable conditions for being outdoors all day.
September in Pierrefonds averages a daily high of 21.3°C with nights around 10.4°C. Expect roughly 9.9 wet days totalling 74.9mm. Comfortable conditions for being outdoors all day.
October in Pierrefonds averages a daily high of 13.7°C with nights around 4.5°C. Expect roughly 10.9 wet days totalling 88.3mm. Generally workable, with some weather to plan around.
November in Pierrefonds averages a daily high of 5.9°C with nights around -1.9°C. Expect roughly 11.5 wet days totalling 75.4mm. A hard month to visit for comfort alone.
December in Pierrefonds averages a daily high of -1.2°C with nights around -8.5°C. Expect roughly 14.6 wet days totalling 84mm. 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. Pierrefonds peaks at 82.
Based on 30 years of records, May–September scores highest for comfort in Pierrefonds, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.3°C.
June is the wettest, averaging 91mm of rain across roughly 11.1 wet days.
January is the coolest month, with average daily highs around -4.6°C.