Plessis, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.6 °F (low) to 54.8 °F (high). Annual precipitation averages 40.2 Inches. Plessis 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 | 9.9 °F | 28.0 °F | 3.11 in. |
| February | 10.8 °F | 29.9 °F | 2.44 in. |
| March | 20.8 °F | 38.6 °F | 2.78 in. |
| April | 33.8 °F | 53.1 °F | 3.19 in. |
| May | 45.7 °F | 66.3 °F | 3.24 in. |
| June | 55.3 °F | 74.8 °F | 3.55 in. |
| July | 61.1 °F | 79.0 °F | 3.27 in. |
| August | 59.7 °F | 78.5 °F | 3.41 in. |
| September | 51.7 °F | 71.2 °F | 3.58 in. |
| October | 40.6 °F | 58.4 °F | 4.63 in. |
| November | 30.3 °F | 45.9 °F | 3.54 in. |
| December | 19.7 °F | 34.0 °F | 3.41 in. |
| Annual | 36.6 °F | 54.8 °F | 40.15 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |