Phippsburg, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 12.5 °C (high). Annual precipitation averages 1252.7 Millimeters. Phippsburg is located in USDA Plant Hardiness Zone 6a. 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 | -7.6 °C | 0 °C | 95 mm |
| February | -6.9 °C | 1.1 °C | 91.44 mm |
| March | -3 °C | 4.9 °C | 109.98 mm |
| April | 1.9 °C | 10.9 °C | 112.01 mm |
| May | 6.9 °C | 16.3 °C | 92.96 mm |
| June | 11.9 °C | 21.2 °C | 112.52 mm |
| July | 15.3 °C | 24.6 °C | 90.68 mm |
| August | 14.9 °C | 24.3 °C | 84.07 mm |
| September | 11.8 °C | 20.8 °C | 101.35 mm |
| October | 6.7 °C | 14.4 °C | 132.33 mm |
| November | 1.8 °C | 8.4 °C | 111.25 mm |
| December | -3.6 °C | 3.3 °C | 119.13 mm |
| Annual | 4.2 °C | 12.5 °C | 1252.72 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 6a : -23.3°C to -20.6°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 |