Shirley, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 44 °F (low) to 61.1 °F (high). Annual precipitation averages 47.3 Inches. Shirley is located in USDA Plant Hardiness Zone 7a. 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 | 23.4 °F | 39.4 °F | 3.81 in. |
| February | 24.4 °F | 41.1 °F | 3.47 in. |
| March | 30.7 °F | 47.6 °F | 4.89 in. |
| April | 39.7 °F | 58.1 °F | 4.19 in. |
| May | 49.5 °F | 68.0 °F | 3.5 in. |
| June | 59.2 °F | 76.9 °F | 3.89 in. |
| July | 65.5 °F | 82.5 °F | 3.11 in. |
| August | 64.5 °F | 81.3 °F | 3.7 in. |
| September | 57.8 °F | 75.0 °F | 3.54 in. |
| October | 46.8 °F | 64.0 °F | 4.66 in. |
| November | 36.9 °F | 53.9 °F | 3.79 in. |
| December | 29.1 °F | 44.8 °F | 4.73 in. |
| Annual | 44 °F | 61.1 °F | 47.28 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |