Witless Bay, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 8.4 °C (high). Annual precipitation averages 1024 Millimeters. Witless Bay is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.68 °C | 0.05 °C | 69 mm |
| February | -6.51 °C | -0.95 °C | 73 mm |
| March | -4.95 °C | 0.04 °C | 67 mm |
| April | -1.4 °C | 4 °C | 78 mm |
| May | 2.54 °C | 8.64 °C | 80 mm |
| June | 6.56 °C | 13.25 °C | 71 mm |
| July | 11.8 °C | 18.81 °C | 80 mm |
| August | 13.07 °C | 19.66 °C | 72 mm |
| September | 10 °C | 16.54 °C | 95 mm |
| October | 6.28 °C | 11.3 °C | 116 mm |
| November | 2.08 °C | 6.95 °C | 113 mm |
| December | -2.29 °C | 2.67 °C | 110 mm |
| Annual | 2.6 °C | 8.4 °C | 1024 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |