Addison, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 11.6 °C (high). Annual precipitation averages 1305.3 Millimeters. Addison is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.8 °C | -0.5 °C | 117.6 mm |
| February | -8.2 °C | 0.1 °C | 95.25 mm |
| March | -4.6 °C | 3.7 °C | 115.06 mm |
| April | 1 °C | 9.4 °C | 107.44 mm |
| May | 5.8 °C | 15.2 °C | 101.09 mm |
| June | 10.1 °C | 20.2 °C | 101.85 mm |
| July | 12.8 °C | 23.4 °C | 87.12 mm |
| August | 13.3 °C | 23.4 °C | 80.77 mm |
| September | 10.3 °C | 19.7 °C | 97.03 mm |
| October | 5.6 °C | 13.7 °C | 135.13 mm |
| November | 0.6 °C | 7.9 °C | 131.57 mm |
| December | -4.8 °C | 3 °C | 135.38 mm |
| Annual | 2.8 °C | 11.6 °C | 1305.29 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |