West Carthage, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.1 °F (low) to 54.1 °F (high). Annual precipitation averages 44.3 Inches. West Carthage is located in USDA Plant Hardiness Zone 4b. 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 | 8.8 °F | 27.4 °F | 3.76 in. |
| February | 9.9 °F | 29.3 °F | 2.73 in. |
| March | 19.5 °F | 38.0 °F | 2.83 in. |
| April | 32.6 °F | 52.4 °F | 3.42 in. |
| May | 44.8 °F | 65.8 °F | 3.64 in. |
| June | 54.2 °F | 74.0 °F | 3.8 in. |
| July | 59.3 °F | 78.5 °F | 3.6 in. |
| August | 57.7 °F | 77.6 °F | 3.79 in. |
| September | 49.6 °F | 70.7 °F | 3.85 in. |
| October | 38.7 °F | 57.6 °F | 4.94 in. |
| November | 28.4 °F | 44.9 °F | 4.02 in. |
| December | 17.5 °F | 33.2 °F | 3.88 in. |
| Annual | 35.1 °F | 54.1 °F | 44.26 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |