| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.3° | -7.6° | 60.2mm | 14.2 | 2 |
| February | 0.5° | -8.3° | 56.8mm | 13 | 4 |
| March | 5.8° | -3.7° | 61.3mm | 11.7 | 23 |
| April | 12.7° | 1.6° | 78.1mm | 12.9 | 50 |
| May | 19.9° | 7.7° | 69.5mm | 11.3 | 77 |
| June | 24.3° | 13.3° | 77.1mm | 10.6 | 79 |
| July | 26.7° | 15.9° | 74.2mm | 10.6 | 79 |
| August | 25.9° | 14.9° | 69.8mm | 10.2 | 80 |
| September | 22.5° | 11.4° | 81.8mm | 9.1 | 82 |
| October | 15.6° | 6° | 90.5mm | 13.8 | 58 |
| November | 8.7° | 0° | 58.9mm | 10.9 | 39 |
| December | 3.2° | -3.7° | 72.4mm | 13.7 | 10 |
January in Welland averages a daily high of 0.3°C with nights around -7.6°C. Expect roughly 14.2 wet days totalling 60.2mm. A hard month to visit for comfort alone.
February in Welland averages a daily high of 0.5°C with nights around -8.3°C. Expect roughly 13 wet days totalling 56.8mm. A hard month to visit for comfort alone.
March in Welland averages a daily high of 5.8°C with nights around -3.7°C. Expect roughly 11.7 wet days totalling 61.3mm. A hard month to visit for comfort alone.
April in Welland averages a daily high of 12.7°C with nights around 1.6°C. Expect roughly 12.9 wet days totalling 78.1mm. Demanding conditions — pack for it and plan indoor options.
May in Welland averages a daily high of 19.9°C with nights around 7.7°C. Expect roughly 11.3 wet days totalling 69.5mm. Comfortable conditions for being outdoors all day.
June in Welland averages a daily high of 24.3°C with nights around 13.3°C. Expect roughly 10.6 wet days totalling 77.1mm. Comfortable conditions for being outdoors all day.
July in Welland averages a daily high of 26.7°C with nights around 15.9°C. Expect roughly 10.6 wet days totalling 74.2mm. Comfortable conditions for being outdoors all day.
August in Welland averages a daily high of 25.9°C with nights around 14.9°C. Expect roughly 10.2 wet days totalling 69.8mm. Comfortable conditions for being outdoors all day.
September in Welland averages a daily high of 22.5°C with nights around 11.4°C. Expect roughly 9.1 wet days totalling 81.8mm. Comfortable conditions for being outdoors all day.
October in Welland averages a daily high of 15.6°C with nights around 6°C. Expect roughly 13.8 wet days totalling 90.5mm. Generally workable, with some weather to plan around.
November in Welland averages a daily high of 8.7°C with nights around 0°C. Expect roughly 10.9 wet days totalling 58.9mm. Demanding conditions — pack for it and plan indoor options.
December in Welland averages a daily high of 3.2°C with nights around -3.7°C. Expect roughly 13.7 wet days totalling 72.4mm. 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. Welland peaks at 82.
Based on 30 years of records, May–September scores highest for comfort in Welland, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.7°C.
October is the wettest, averaging 90.5mm of rain across roughly 13.8 wet days.
January is the coolest month, with average daily highs around 0.3°C.