Deer Lake, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -1 °C (low) to 6.7 °C (high). Annual precipitation averages 782 Millimeters. Deer Lake is located in USDA Plant Hardiness Zone 4b. 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 | -11.62 °C | -4.73 °C | 17 mm |
| February | -12.29 °C | -4.93 °C | 12 mm |
| March | -10.34 °C | -2.86 °C | 27 mm |
| April | -4.25 °C | 2.6 °C | 47 mm |
| May | 0.66 °C | 9.77 °C | 71 mm |
| June | 5.76 °C | 15.48 °C | 68 mm |
| July | 10.33 °C | 20.36 °C | 85 mm |
| August | 10.3 °C | 19.59 °C | 105 mm |
| September | 6.58 °C | 14.84 °C | 112 mm |
| October | 2.48 °C | 8.46 °C | 103 mm |
| November | -1.98 °C | 3.13 °C | 85 mm |
| December | -7.17 °C | -1.81 °C | 50 mm |
| Annual | -1 °C | 6.7 °C | 782 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |