Hartland, New Brunswick climate data is summarized below. Annual precipitation averages 845 Millimeters. Hartland is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.89 °C | -4.99 °C | 4 mm |
| February | -13.89 °C | -3.68 °C | 11 mm |
| March | -9.02 °C | 1.53 °C | 45 mm |
| April | -1.33 °C | 9.39 °C | 75 mm |
| May | 5.15 °C | 17.05 °C | 89 mm |
| June | 10.14 °C | 21.66 °C | 99 mm |
| July | 13.79 °C | 25.36 °C | 105 mm |
| August | 12.77 °C | 24.69 °C | 86 mm |
| September | 7.76 °C | 19.91 °C | 77 mm |
| October | 2.62 °C | 12.64 °C | 101 mm |
| November | -2.48 °C | 5.51 °C | 103 mm |
| December | -10.17 °C | -1.82 °C | 50 mm |
| Annual | 0 °C | 10.6 °C | 845 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |