Richmondville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.1 °F (low) to 56.4 °F (high). Annual precipitation averages 42.9 Inches. Richmondville is located in USDA Plant Hardiness Zone 5b. 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 | 13.5 °F | 31.1 °F | 2.92 in. |
| February | 14.9 °F | 34.0 °F | 2.43 in. |
| March | 21.9 °F | 41.8 °F | 3.3 in. |
| April | 33.0 °F | 55.4 °F | 3.41 in. |
| May | 44.0 °F | 67.7 °F | 3.52 in. |
| June | 53.3 °F | 75.5 °F | 4.28 in. |
| July | 58.1 °F | 80.0 °F | 4.17 in. |
| August | 56.4 °F | 78.4 °F | 4.17 in. |
| September | 49.3 °F | 71.5 °F | 3.78 in. |
| October | 38.7 °F | 58.9 °F | 3.99 in. |
| November | 29.3 °F | 46.8 °F | 3.17 in. |
| December | 21.1 °F | 36.1 °F | 3.71 in. |
| Annual | 36.1 °F | 56.4 °F | 42.85 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |