Clifton, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.2 °C (high). Annual precipitation averages 1159 Millimeters. Clifton is located in USDA Plant Hardiness Zone 5a. 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 | -12 °C | -3.1 °C | 90.42 mm |
| February | -11.3 °C | -0.6 °C | 72.9 mm |
| March | -6.4 °C | 3.9 °C | 93.73 mm |
| April | 0.4 °C | 11.2 °C | 100.33 mm |
| May | 6.7 °C | 17.9 °C | 91.44 mm |
| June | 11.9 °C | 23 °C | 97.54 mm |
| July | 15.3 °C | 26.2 °C | 84.58 mm |
| August | 14.6 °C | 25.7 °C | 87.63 mm |
| September | 10.2 °C | 21.3 °C | 94.23 mm |
| October | 3.6 °C | 13.5 °C | 122.94 mm |
| November | -1.4 °C | 6.6 °C | 109.22 mm |
| December | -7.7 °C | 0.2 °C | 114.05 mm |
| Annual | 2 °C | 12.2 °C | 1159.01 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |