Millertown, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 31 °F (low) to 45.3 °F (high). Annual precipitation averages 29.2 Inches. Millertown is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -24.2 °F | -20.1 °F | 457.2 in. |
| February | -24.5 °F | -20.2 °F | 635 in. |
| March | -23.4 °F | -19.1 °F | 584.2 in. |
| April | -19.9 °F | -16 °F | 1143 in. |
| May | -17.1 °F | -12 °F | 1727.2 in. |
| June | -14.3 °F | -8.9 °F | 1752.6 in. |
| July | -11.6 °F | -6 °F | 1981.2 in. |
| August | -11.7 °F | -6.3 °F | 2489.2 in. |
| September | -13.9 °F | -8.9 °F | 2514.6 in. |
| October | -16.3 °F | -12.6 °F | 2362.2 in. |
| November | -18.7 °F | -15.6 °F | 1981.2 in. |
| December | -21.5 °F | -18.4 °F | 1219.2 in. |
| Annual | 31 °F | 45.3 °F | 29.22 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |