Morrisville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.9 °C (high). Annual precipitation averages 1180.3 Millimeters. Morrisville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11 °C | -1.4 °C | 81.53 mm |
| February | -10.1 °C | -0.2 °C | 72.39 mm |
| March | -6.2 °C | 4.3 °C | 91.69 mm |
| April | 0.6 °C | 12.2 °C | 97.03 mm |
| May | 6.9 °C | 19.4 °C | 100.33 mm |
| June | 11.8 °C | 24.1 °C | 119.13 mm |
| July | 14.3 °C | 26.3 °C | 112.52 mm |
| August | 13.5 °C | 25.3 °C | 107.95 mm |
| September | 9.8 °C | 21.7 °C | 103.38 mm |
| October | 3.8 °C | 14.6 °C | 108.46 mm |
| November | -1.6 °C | 7.5 °C | 92.2 mm |
| December | -6.7 °C | 1.4 °C | 93.73 mm |
| Annual | 2.1 °C | 12.9 °C | 1180.34 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |