Winterton, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 3.2 °C (low) to 7.4 °C (high). Annual precipitation averages 941 Millimeters. Winterton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.13 °C | -0.23 °C | 55 mm |
| February | -5.8 °C | -1.25 °C | 53 mm |
| March | -4.26 °C | -0.35 °C | 51 mm |
| April | -0.86 °C | 2.76 °C | 64 mm |
| May | 2.94 °C | 6.84 °C | 77 mm |
| June | 7.02 °C | 11 °C | 68 mm |
| July | 12 °C | 16.39 °C | 77 mm |
| August | 13.79 °C | 17.75 °C | 82 mm |
| September | 11.03 °C | 15.26 °C | 102 mm |
| October | 7.08 °C | 10.8 °C | 112 mm |
| November | 2.71 °C | 6.66 °C | 102 mm |
| December | -1.8 °C | 2.52 °C | 98 mm |
| Annual | 3.2 °C | 7.4 °C | 941 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |