Addison, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 14.8 °C (high). Annual precipitation averages 887.2 Millimeters. Addison is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.5 °C | 0.5 °C | 46.99 mm |
| February | -8.9 °C | 2.1 °C | 40.64 mm |
| March | -5.1 °C | 6.7 °C | 64.26 mm |
| April | 0.6 °C | 14.3 °C | 79.76 mm |
| May | 6.7 °C | 21.2 °C | 81.03 mm |
| June | 11.9 °C | 25.6 °C | 88.14 mm |
| July | 14.2 °C | 28 °C | 95.25 mm |
| August | 13.6 °C | 27.1 °C | 85.85 mm |
| September | 9.7 °C | 23.1 °C | 94.23 mm |
| October | 3.8 °C | 16.3 °C | 93.22 mm |
| November | -1.4 °C | 9.2 °C | 64.26 mm |
| December | -5.6 °C | 3.2 °C | 53.59 mm |
| Annual | 2.5 °C | 14.8 °C | 887.22 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |