Postville, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -5.9 °C (low) to 3.1 °C (high). Annual precipitation averages 495 Millimeters. Postville is located in USDA Plant Hardiness Zone 2a. 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 | -20.05 °C | -11.55 °C | 0 mm |
| February | -20.75 °C | -10.73 °C | 0 mm |
| March | -18.39 °C | -7.01 °C | 0 mm |
| April | -9.81 °C | -0.25 °C | 0 mm |
| May | -3.17 °C | 4.63 °C | 52 mm |
| June | 4.6 °C | 14.7 °C | 83 mm |
| July | 9.08 °C | 19.32 °C | 95 mm |
| August | 9.34 °C | 19.48 °C | 77 mm |
| September | 3.97 °C | 13.21 °C | 97 mm |
| October | -0.47 °C | 5.83 °C | 72 mm |
| November | -8.3 °C | -1.31 °C | 19 mm |
| December | -16.33 °C | -8.46 °C | 0 mm |
| Annual | -5.9 °C | 3.1 °C | 495 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 2a : -45.6°C to -42.8°C |
| Current Drought Conditions | Moderate Drought |