Addison, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37 °F (low) to 52.9 °F (high). Annual precipitation averages 51.4 Inches. 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 | 16.2 °F | 31.1 °F | 4.63 in. |
| February | 17.2 °F | 32.2 °F | 3.75 in. |
| March | 23.8 °F | 38.6 °F | 4.53 in. |
| April | 33.8 °F | 48.9 °F | 4.23 in. |
| May | 42.4 °F | 59.3 °F | 3.98 in. |
| June | 50.1 °F | 68.4 °F | 4.01 in. |
| July | 55.1 °F | 74.1 °F | 3.43 in. |
| August | 56.0 °F | 74.2 °F | 3.18 in. |
| September | 50.6 °F | 67.4 °F | 3.82 in. |
| October | 42.0 °F | 56.6 °F | 5.32 in. |
| November | 33.0 °F | 46.3 °F | 5.18 in. |
| December | 23.3 °F | 37.4 °F | 5.33 in. |
| Annual | 37 °F | 52.9 °F | 51.39 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |