Surry, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.2 °C (high). Annual precipitation averages 1237.7 Millimeters. Surry 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 | -10.9 °C | -1.7 °C | 100.33 mm |
| February | -10.4 °C | -0.2 °C | 87.63 mm |
| March | -6 °C | 4.1 °C | 103.12 mm |
| April | 0.1 °C | 10.6 °C | 112.01 mm |
| May | 5.8 °C | 17.2 °C | 97.28 mm |
| June | 10.9 °C | 22.2 °C | 104.14 mm |
| July | 14.8 °C | 25.4 °C | 78.23 mm |
| August | 13.8 °C | 25.1 °C | 81.28 mm |
| September | 9.7 °C | 20.8 °C | 96.27 mm |
| October | 3.7 °C | 13.8 °C | 130.05 mm |
| November | -1.5 °C | 7.6 °C | 124.21 mm |
| December | -7.3 °C | 1.7 °C | 123.19 mm |
| Annual | 1.9 °C | 12.2 °C | 1237.74 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 |