Thorndike, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.6 °F (low) to 53.7 °F (high). Annual precipitation averages 46.7 Inches. Thorndike is located in USDA Plant Hardiness Zone 5a. 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 | 9.7 °F | 26.9 °F | 3.47 in. |
| February | 11.4 °F | 30.6 °F | 3.0 in. |
| March | 20.8 °F | 38.9 °F | 3.73 in. |
| April | 33.5 °F | 51.9 °F | 4.08 in. |
| May | 44.5 °F | 64.7 °F | 3.63 in. |
| June | 52.3 °F | 72.5 °F | 4.24 in. |
| July | 58.5 °F | 78.0 °F | 3.41 in. |
| August | 58.0 °F | 77.2 °F | 3.55 in. |
| September | 50.4 °F | 69.8 °F | 3.8 in. |
| October | 39.8 °F | 56.7 °F | 5.17 in. |
| November | 29.6 °F | 44.3 °F | 4.3 in. |
| December | 18.5 °F | 33.0 °F | 4.29 in. |
| Annual | 35.6 °F | 53.7 °F | 46.67 in. |
| 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |