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.
Across the year, the best time to visit Dartmouth is June–September.
Based on SHEARWATER A, NS CA (7.4km), 1995–2024. 11 years of December data.