Winslow, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.1 °F (low) to 55.5 °F (high). Annual precipitation averages 42.9 Inches. Winslow 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.3 °F | 28.9 °F | 3.04 in. |
| February | 10.7 °F | 32.1 °F | 2.59 in. |
| March | 21.0 °F | 40.6 °F | 3.08 in. |
| April | 32.4 °F | 53.6 °F | 3.67 in. |
| May | 43.3 °F | 65.7 °F | 3.37 in. |
| June | 53.1 °F | 74.5 °F | 3.99 in. |
| July | 59.0 °F | 79.9 °F | 3.41 in. |
| August | 57.5 °F | 79.1 °F | 3.52 in. |
| September | 49.7 °F | 71.5 °F | 3.72 in. |
| October | 38.8 °F | 58.6 °F | 4.93 in. |
| November | 29.0 °F | 46.0 °F | 3.79 in. |
| December | 17.8 °F | 34.9 °F | 3.83 in. |
| Annual | 35.1 °F | 55.5 °F | 42.94 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |