Deer Lake, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 30.3 °F (low) to 44 °F (high). Annual precipitation averages 30.8 Inches. 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 | -24.2 °F | -20.4 °F | 431.8 in. |
| February | -24.6 °F | -20.5 °F | 304.8 in. |
| March | -23.5 °F | -19.4 °F | 685.8 in. |
| April | -20.1 °F | -16.3 °F | 1193.8 in. |
| May | -17.4 °F | -12.4 °F | 1803.4 in. |
| June | -14.6 °F | -9.2 °F | 1727.2 in. |
| July | -12 °F | -6.5 °F | 2159 in. |
| August | -12.1 °F | -6.9 °F | 2667 in. |
| September | -14.1 °F | -9.5 °F | 2844.8 in. |
| October | -16.4 °F | -13.1 °F | 2616.2 in. |
| November | -18.9 °F | -16 °F | 2159 in. |
| December | -21.8 °F | -18.8 °F | 1270 in. |
| Annual | 30.3 °F | 44 °F | 30.8 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |