Searsport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 12.6 °C (high). Annual precipitation averages 1233.9 Millimeters. Searsport 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 | -10.5 °C | -1.1 °C | 100.08 mm |
| February | -9.7 °C | 0.4 °C | 82.04 mm |
| March | -5.2 °C | 4.5 °C | 99.31 mm |
| April | 0.5 °C | 11.2 °C | 111.51 mm |
| May | 5.7 °C | 17.3 °C | 96.77 mm |
| June | 10.8 °C | 22.3 °C | 108.97 mm |
| July | 14.2 °C | 25.5 °C | 80.26 mm |
| August | 13.7 °C | 25.2 °C | 82.55 mm |
| September | 9.9 °C | 21.3 °C | 99.82 mm |
| October | 4.4 °C | 14.6 °C | 137.41 mm |
| November | -0.8 °C | 8.1 °C | 118.11 mm |
| December | -6.4 °C | 2.3 °C | 117.09 mm |
| Annual | 2.2 °C | 12.6 °C | 1233.92 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 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 |