Sackets Harbor, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 12.5 °C (high). Annual precipitation averages 1060.2 Millimeters. Sackets Harbor is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.7 °C | -1.9 °C | 94.23 mm |
| February | -10.4 °C | -1.1 °C | 71.88 mm |
| March | -5.4 °C | 3.6 °C | 73.15 mm |
| April | 1.3 °C | 11.3 °C | 88.14 mm |
| May | 7.7 °C | 18.1 °C | 78.99 mm |
| June | 13.3 °C | 23.1 °C | 84.07 mm |
| July | 16.5 °C | 25.8 °C | 76.96 mm |
| August | 15.9 °C | 25.2 °C | 83.31 mm |
| September | 11.7 °C | 21.4 °C | 90.93 mm |
| October | 5.9 °C | 14.4 °C | 118.62 mm |
| November | 0 °C | 7.9 °C | 100.84 mm |
| December | -5.8 °C | 1.7 °C | 99.06 mm |
| Annual | 3.3 °C | 12.5 °C | 1060.18 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |