Gray, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 13.2 °C (high). Annual precipitation averages 1274.8 Millimeters. Gray 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 | -11.6 °C | -1.2 °C | 87.88 mm |
| February | -10.9 °C | 0.6 °C | 92.46 mm |
| March | -5.6 °C | 5.2 °C | 99.57 mm |
| April | 0.6 °C | 12.1 °C | 111.76 mm |
| May | 6.5 °C | 18.4 °C | 92.71 mm |
| June | 12.2 °C | 23.3 °C | 121.41 mm |
| July | 15.5 °C | 26.6 °C | 97.28 mm |
| August | 14.7 °C | 26.1 °C | 92.96 mm |
| September | 10.4 °C | 21.9 °C | 99.82 mm |
| October | 4 °C | 14.8 °C | 146.3 mm |
| November | -1.5 °C | 8 °C | 113.03 mm |
| December | -7.3 °C | 2.2 °C | 119.63 mm |
| Annual | 2.3 °C | 13.2 °C | 1274.81 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |