| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0° | -8.2° | 119.8mm | 15.3 | 0 |
| February | 0.4° | -8.2° | 109.4mm | 12 | 6 |
| March | 3.8° | -3.8° | 123.6mm | 12.7 | 14 |
| April | 8.3° | 0.4° | 113.5mm | 13.7 | 33 |
| May | 13.5° | 4.9° | 128.2mm | 12.3 | 55 |
| June | 19.1° | 10.1° | 111.5mm | 12 | 73 |
| July | 22.3° | 13.8° | 94.6mm | 10.2 | 80 |
| August | 23.2° | 14.5° | 81.3mm | 10.1 | 80 |
| September | 20.2° | 11.4° | 84.8mm | 9.3 | 81 |
| October | 14.2° | 6.2° | 144.6mm | 11.2 | 59 |
| November | 8.3° | 1.5° | 132.1mm | 14 | 34 |
| December | 3.1° | -4.3° | 128.1mm | 13 | 10 |
January in Dartmouth averages a daily high of 0°C with nights around -8.2°C. Expect roughly 15.3 wet days totalling 119.8mm. A hard month to visit for comfort alone.
February in Dartmouth averages a daily high of 0.4°C with nights around -8.2°C. Expect roughly 12 wet days totalling 109.4mm. A hard month to visit for comfort alone.
March in Dartmouth averages a daily high of 3.8°C with nights around -3.8°C. Expect roughly 12.7 wet days totalling 123.6mm. A hard month to visit for comfort alone.
April in Dartmouth averages a daily high of 8.3°C with nights around 0.4°C. Expect roughly 13.7 wet days totalling 113.5mm. A hard month to visit for comfort alone.
May in Dartmouth averages a daily high of 13.5°C with nights around 4.9°C. Expect roughly 12.3 wet days totalling 128.2mm. Generally workable, with some weather to plan around.
June in Dartmouth averages a daily high of 19.1°C with nights around 10.1°C. Expect roughly 12 wet days totalling 111.5mm. Generally workable, with some weather to plan around.
July in Dartmouth averages a daily high of 22.3°C with nights around 13.8°C. Expect roughly 10.2 wet days totalling 94.6mm. Comfortable conditions for being outdoors all day.
August in Dartmouth averages a daily high of 23.2°C with nights around 14.5°C. Expect roughly 10.1 wet days totalling 81.3mm. Comfortable conditions for being outdoors all day.
September in Dartmouth averages a daily high of 20.2°C with nights around 11.4°C. Expect roughly 9.3 wet days totalling 84.8mm. Comfortable conditions for being outdoors all day.
October in Dartmouth averages a daily high of 14.2°C with nights around 6.2°C. Expect roughly 11.2 wet days totalling 144.6mm. Generally workable, with some weather to plan around.
November in Dartmouth averages a daily high of 8.3°C with nights around 1.5°C. Expect roughly 14 wet days totalling 132.1mm. A hard month to visit for comfort alone.
December in Dartmouth averages a daily high of 3.1°C with nights around -4.3°C. Expect roughly 13 wet days totalling 128.1mm. 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. Dartmouth peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Dartmouth, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 23.2°C.
October is the wettest, averaging 144.6mm of rain across roughly 11.2 wet days.
January is the coolest month, with average daily highs around 0°C.