Westmoreland, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.7 °F (low) to 56.7 °F (high). Annual precipitation averages 46.2 Inches. Westmoreland is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °F | 30.1 °F | 3.15 in. |
| February | 14.1 °F | 32.3 °F | 2.92 in. |
| March | 22.9 °F | 40.7 °F | 3.23 in. |
| April | 34.5 °F | 55.4 °F | 3.67 in. |
| May | 45.8 °F | 68.7 °F | 3.85 in. |
| June | 55.8 °F | 77.0 °F | 4.91 in. |
| July | 60.6 °F | 81.6 °F | 4.06 in. |
| August | 59.1 °F | 79.9 °F | 4.06 in. |
| September | 51.8 °F | 72.8 °F | 4.01 in. |
| October | 41.2 °F | 59.6 °F | 4.76 in. |
| November | 31.4 °F | 47.1 °F | 3.79 in. |
| December | 21.7 °F | 35.7 °F | 3.76 in. |
| Annual | 37.7 °F | 56.7 °F | 46.17 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |