Waldoboro, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 55.1 °F (high). Annual precipitation averages 50.3 Inches. Waldoboro is located in USDA Plant Hardiness Zone 6a. 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 | 11.8 °F | 30.4 °F | 4.02 in. |
| February | 13.7 °F | 33.4 °F | 3.6 in. |
| March | 22.9 °F | 41.0 °F | 4.4 in. |
| April | 33.1 °F | 52.9 °F | 4.49 in. |
| May | 43.5 °F | 63.7 °F | 3.77 in. |
| June | 52.8 °F | 72.4 °F | 4.37 in. |
| July | 58.9 °F | 78.3 °F | 3.4 in. |
| August | 57.7 °F | 77.5 °F | 3.2 in. |
| September | 50.5 °F | 70.3 °F | 4.14 in. |
| October | 39.7 °F | 58.2 °F | 5.37 in. |
| November | 30.2 °F | 47.0 °F | 4.69 in. |
| December | 19.7 °F | 36.4 °F | 4.82 in. |
| Annual | 36.2 °F | 55.1 °F | 50.27 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 6a : -10°F to -5°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 |