Mount Morris, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 14.8 °C (high). Annual precipitation averages 832.4 Millimeters. Mount Morris is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 0.7 °C | 46.99 mm |
| February | -7.9 °C | 1.8 °C | 37.85 mm |
| March | -3.9 °C | 6.3 °C | 50.8 mm |
| April | 2.1 °C | 13.9 °C | 67.31 mm |
| May | 8.5 °C | 21 °C | 75.44 mm |
| June | 13.6 °C | 25.7 °C | 89.15 mm |
| July | 16 °C | 27.8 °C | 106.43 mm |
| August | 15.2 °C | 27 °C | 87.12 mm |
| September | 11.1 °C | 23.4 °C | 75.18 mm |
| October | 5.4 °C | 16.5 °C | 81.03 mm |
| November | 0.2 °C | 9.5 °C | 62.48 mm |
| December | -4.3 °C | 3.7 °C | 52.58 mm |
| Annual | 4 °C | 14.8 °C | 832.36 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |