Dover, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 34.5 °F (low) to 46.2 °F (high). Annual precipitation averages 34.7 Inches. Dover is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -22.3 °F | -18.9 °F | 939.8 in. |
| February | -22.7 °F | -19.2 °F | 939.8 in. |
| March | -21.6 °F | -18.4 °F | 889 in. |
| April | -19 °F | -16 °F | 1346.2 in. |
| May | -16.6 °F | -12.7 °F | 1905 in. |
| June | -14 °F | -9.8 °F | 1905 in. |
| July | -11.2 °F | -6.5 °F | 2133.6 in. |
| August | -10.9 °F | -6.5 °F | 2387.6 in. |
| September | -12.8 °F | -8.7 °F | 2641.6 in. |
| October | -15.1 °F | -12 °F | 2819.4 in. |
| November | -17.5 °F | -14.7 °F | 2641.6 in. |
| December | -20.2 °F | -17.3 °F | 1828.8 in. |
| Annual | 34.5 °F | 46.2 °F | 34.68 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |