Appleton, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 12.2 °C (high). Annual precipitation averages 1276.4 Millimeters. Appleton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.4 °C | -1.9 °C | 100.58 mm |
| February | -10.3 °C | -0.4 °C | 88.65 mm |
| March | -4.9 °C | 4.1 °C | 105.16 mm |
| April | 1.6 °C | 10.8 °C | 116.08 mm |
| May | 7.4 °C | 17.4 °C | 95.5 mm |
| June | 12.6 °C | 22 °C | 112.52 mm |
| July | 15.9 °C | 25.3 °C | 83.31 mm |
| August | 15.5 °C | 24.9 °C | 87.63 mm |
| September | 11.4 °C | 20.8 °C | 102.62 mm |
| October | 5.3 °C | 14.1 °C | 146.56 mm |
| November | -0.6 °C | 7.6 °C | 117.35 mm |
| December | -6.6 °C | 1.5 °C | 120.4 mm |
| Annual | 3 °C | 12.2 °C | 1276.36 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |