Steep Falls, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 56.4 °F (high). Annual precipitation averages 49.5 Inches. Steep Falls is located in USDA Plant Hardiness Zone 5a. 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 | 9.8 °F | 30.3 °F | 3.26 in. |
| February | 10.8 °F | 33.4 °F | 3.4 in. |
| March | 20.9 °F | 41.7 °F | 4.08 in. |
| April | 32.1 °F | 54.5 °F | 4.46 in. |
| May | 42.9 °F | 66.6 °F | 3.77 in. |
| June | 53.0 °F | 75.2 °F | 4.63 in. |
| July | 58.7 °F | 81.2 °F | 4.14 in. |
| August | 56.9 °F | 79.9 °F | 3.69 in. |
| September | 49.0 °F | 72.1 °F | 3.95 in. |
| October | 37.5 °F | 59.0 °F | 5.42 in. |
| November | 27.9 °F | 46.7 °F | 4.26 in. |
| December | 17.3 °F | 36.0 °F | 4.4 in. |
| Annual | 34.7 °F | 56.4 °F | 49.46 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 5a : -20°F to -15°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 |