Hartland, New Brunswick climate data is summarized below. Average annual temperatures range from 32.1 °F (low) to 51.1 °F (high). Annual precipitation averages 33.3 Inches. 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 | -26.1 °F | -20.6 °F | 101.6 in. |
| February | -25.5 °F | -19.8 °F | 279.4 in. |
| March | -22.8 °F | -16.9 °F | 1143 in. |
| April | -18.5 °F | -12.6 °F | 1905 in. |
| May | -14.9 °F | -8.3 °F | 2260.6 in. |
| June | -12.1 °F | -5.7 °F | 2514.6 in. |
| July | -10.1 °F | -3.7 °F | 2667 in. |
| August | -10.7 °F | -4.1 °F | 2184.4 in. |
| September | -13.5 °F | -6.7 °F | 1955.8 in. |
| October | -16.3 °F | -10.8 °F | 2565.4 in. |
| November | -19.2 °F | -14.7 °F | 2616.2 in. |
| December | -23.4 °F | -18.8 °F | 1270 in. |
| Annual | 32.1 °F | 51.1 °F | 33.27 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |