Gorham, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 56.4 °F (high). Annual precipitation averages 49.7 Inches. Gorham 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 | 11.4 °F | 31.0 °F | 3.49 in. |
| February | 12.5 °F | 34.0 °F | 3.54 in. |
| March | 22.0 °F | 42.1 °F | 4.19 in. |
| April | 33.1 °F | 54.3 °F | 4.51 in. |
| May | 43.7 °F | 65.9 °F | 3.7 in. |
| June | 53.7 °F | 74.7 °F | 4.46 in. |
| July | 59.6 °F | 80.3 °F | 3.74 in. |
| August | 57.9 °F | 79.6 °F | 3.54 in. |
| September | 50.2 °F | 72.0 °F | 3.9 in. |
| October | 38.8 °F | 59.3 °F | 5.55 in. |
| November | 29.2 °F | 47.2 °F | 4.35 in. |
| December | 18.8 °F | 36.7 °F | 4.68 in. |
| Annual | 35.9 °F | 56.4 °F | 49.65 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |