Marilla, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 13.5 °C (high). Annual precipitation averages 1099.1 Millimeters. Marilla is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9 °C | -0.2 °C | 86.36 mm |
| February | -8.6 °C | 0.7 °C | 64.01 mm |
| March | -4.9 °C | 5.3 °C | 78.74 mm |
| April | 1.1 °C | 12.7 °C | 89.41 mm |
| May | 7.4 °C | 19.3 °C | 85.85 mm |
| June | 12.7 °C | 23.9 °C | 104.14 mm |
| July | 15.1 °C | 26.1 °C | 97.03 mm |
| August | 14.2 °C | 25.8 °C | 90.93 mm |
| September | 10.4 °C | 22.2 °C | 103.38 mm |
| October | 4.7 °C | 15.2 °C | 108.71 mm |
| November | -0.4 °C | 8.4 °C | 99.06 mm |
| December | -5.2 °C | 2.6 °C | 91.44 mm |
| Annual | 3.1 °C | 13.5 °C | 1099.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |