Hillside, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.4 °F (low) to 61 °F (high). Annual precipitation averages 48.9 Inches. Hillside is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.8 °F | 35.6 °F | 3.51 in. |
| February | 18.4 °F | 38.5 °F | 2.79 in. |
| March | 26.3 °F | 47.2 °F | 3.78 in. |
| April | 37.2 °F | 60.6 °F | 3.91 in. |
| May | 47.5 °F | 71.8 °F | 3.83 in. |
| June | 56.6 °F | 80.1 °F | 4.38 in. |
| July | 61.5 °F | 84.9 °F | 4.8 in. |
| August | 60.1 °F | 82.9 °F | 4.37 in. |
| September | 52.4 °F | 75.5 °F | 4.87 in. |
| October | 41.4 °F | 63.1 °F | 4.86 in. |
| November | 31.5 °F | 51.3 °F | 3.58 in. |
| December | 23.1 °F | 40.3 °F | 4.19 in. |
| Annual | 39.4 °F | 61 °F | 48.87 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |