Hillsdale, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 56.6 °F (high). Annual precipitation averages 46.6 Inches. Hillsdale is located in USDA Plant Hardiness Zone 6a. 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 | 13.0 °F | 31.0 °F | 3.29 in. |
| February | 14.6 °F | 33.9 °F | 2.64 in. |
| March | 22.1 °F | 42.1 °F | 3.35 in. |
| April | 32.4 °F | 56.4 °F | 3.62 in. |
| May | 43.4 °F | 67.9 °F | 3.75 in. |
| June | 52.4 °F | 75.4 °F | 4.66 in. |
| July | 57.1 °F | 80.1 °F | 4.66 in. |
| August | 56.8 °F | 78.5 °F | 4.49 in. |
| September | 48.5 °F | 71.4 °F | 4.4 in. |
| October | 39.1 °F | 59.2 °F | 4.43 in. |
| November | 28.9 °F | 47.1 °F | 3.27 in. |
| December | 19.9 °F | 36.1 °F | 3.99 in. |
| Annual | 35.7 °F | 56.6 °F | 46.55 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |