Dartmouth, Nova Scotia climate data is summarized below. Average annual temperatures range from 3.5 °C (low) to 12.2 °C (high). Annual precipitation averages 1376 Millimeters. Dartmouth is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.79 °C | 0.47 °C | 71 mm |
| February | -7.67 °C | 0.61 °C | 87 mm |
| March | -4.54 °C | 4.24 °C | 83 mm |
| April | 0.89 °C | 9.66 °C | 115 mm |
| May | 5.67 °C | 15.2 °C | 98 mm |
| June | 10.41 °C | 19.6 °C | 127 mm |
| July | 15.04 °C | 24.31 °C | 82 mm |
| August | 15.06 °C | 24.38 °C | 108 mm |
| September | 11.11 °C | 20.53 °C | 135 mm |
| October | 6.21 °C | 14.64 °C | 157 mm |
| November | 1.28 °C | 8.95 °C | 148 mm |
| December | -4.03 °C | 3.63 °C | 165 mm |
| Annual | 3.5 °C | 12.2 °C | 1376 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |