Friendship, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 11.9 °C (high). Annual precipitation averages 1248.7 Millimeters. Friendship 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 | -6.7 °C | 0.1 °C | 102.36 mm |
| February | -6.4 °C | 1 °C | 91.44 mm |
| March | -3 °C | 4.4 °C | 115.32 mm |
| April | 1.6 °C | 10.1 °C | 110.74 mm |
| May | 6.5 °C | 15.3 °C | 93.98 mm |
| June | 11.2 °C | 20 °C | 104.65 mm |
| July | 14.6 °C | 23.3 °C | 84.58 mm |
| August | 14.3 °C | 23.2 °C | 76.2 mm |
| September | 11.7 °C | 19.7 °C | 104.9 mm |
| October | 7.2 °C | 13.8 °C | 127.51 mm |
| November | 2.3 °C | 8.5 °C | 114.81 mm |
| December | -3.2 °C | 3.3 °C | 122.17 mm |
| Annual | 4.2 °C | 11.9 °C | 1248.66 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |