Thorndike, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.1 °C (high). Annual precipitation averages 1185.4 Millimeters. 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 | -12.4 °C | -2.8 °C | 88.14 mm |
| February | -11.4 °C | -0.8 °C | 76.2 mm |
| March | -6.2 °C | 3.8 °C | 94.74 mm |
| April | 0.8 °C | 11.1 °C | 103.63 mm |
| May | 6.9 °C | 18.2 °C | 92.2 mm |
| June | 11.3 °C | 22.5 °C | 107.7 mm |
| July | 14.7 °C | 25.6 °C | 86.61 mm |
| August | 14.4 °C | 25.1 °C | 90.17 mm |
| September | 10.2 °C | 21 °C | 96.52 mm |
| October | 4.3 °C | 13.7 °C | 131.32 mm |
| November | -1.3 °C | 6.8 °C | 109.22 mm |
| December | -7.5 °C | 0.6 °C | 108.97 mm |
| Annual | 2 °C | 12.1 °C | 1185.42 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |