Steep Falls, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 13.6 °C (high). Annual precipitation averages 1256.3 Millimeters. 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 | -12.3 °C | -0.9 °C | 82.8 mm |
| February | -11.8 °C | 0.8 °C | 86.36 mm |
| March | -6.2 °C | 5.4 °C | 103.63 mm |
| April | 0.1 °C | 12.5 °C | 113.28 mm |
| May | 6.1 °C | 19.2 °C | 95.76 mm |
| June | 11.7 °C | 24 °C | 117.6 mm |
| July | 14.8 °C | 27.3 °C | 105.16 mm |
| August | 13.8 °C | 26.6 °C | 93.73 mm |
| September | 9.4 °C | 22.3 °C | 100.33 mm |
| October | 3.1 °C | 15 °C | 137.67 mm |
| November | -2.3 °C | 8.2 °C | 108.2 mm |
| December | -8.2 °C | 2.2 °C | 111.76 mm |
| Annual | 1.5 °C | 13.6 °C | 1256.28 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |