Plymouth, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.3 °F (low) to 55.4 °F (high). Annual precipitation averages 46.8 Inches. Plymouth 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.4 °F | 30.1 °F | 3.18 in. |
| February | 13.6 °F | 32.5 °F | 2.76 in. |
| March | 20.4 °F | 40.6 °F | 3.57 in. |
| April | 32.2 °F | 53.9 °F | 3.97 in. |
| May | 43.3 °F | 66.7 °F | 3.94 in. |
| June | 52.6 °F | 74.8 °F | 4.87 in. |
| July | 57.2 °F | 78.9 °F | 4.68 in. |
| August | 55.3 °F | 77.6 °F | 4.46 in. |
| September | 49.0 °F | 70.9 °F | 4.08 in. |
| October | 38.5 °F | 58.1 °F | 4.14 in. |
| November | 28.7 °F | 45.8 °F | 3.54 in. |
| December | 20.0 °F | 34.9 °F | 3.63 in. |
| Annual | 35.3 °F | 55.4 °F | 46.82 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |