Millertown, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -0.6 °C (low) to 7.4 °C (high). Annual precipitation averages 742 Millimeters. 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 | -11.59 °C | -4.18 °C | 18 mm |
| February | -12.04 °C | -4.41 °C | 25 mm |
| March | -10.05 °C | -2.33 °C | 23 mm |
| April | -3.84 °C | 3.25 °C | 45 mm |
| May | 1.15 °C | 10.41 °C | 68 mm |
| June | 6.23 °C | 16 °C | 69 mm |
| July | 11.13 °C | 21.19 °C | 78 mm |
| August | 10.94 °C | 20.64 °C | 98 mm |
| September | 7.05 °C | 15.97 °C | 99 mm |
| October | 2.75 °C | 9.35 °C | 93 mm |
| November | -1.67 °C | 3.88 °C | 78 mm |
| December | -6.78 °C | -1.15 °C | 48 mm |
| Annual | -0.6 °C | 7.4 °C | 742 mm |
| 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 : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |