Greenwich, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.5 °F (low) to 58.2 °F (high). Annual precipitation averages 44 Inches. Greenwich 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 | 12.2 °F | 31.5 °F | 3.13 in. |
| February | 13.1 °F | 34.6 °F | 2.31 in. |
| March | 22.5 °F | 43.5 °F | 3.15 in. |
| April | 34.5 °F | 57.8 °F | 3.49 in. |
| May | 45.6 °F | 69.8 °F | 3.69 in. |
| June | 54.8 °F | 77.6 °F | 4.77 in. |
| July | 59.0 °F | 82.6 °F | 4.2 in. |
| August | 57.7 °F | 80.7 °F | 4.5 in. |
| September | 49.9 °F | 73.7 °F | 3.96 in. |
| October | 39.1 °F | 60.9 °F | 4.12 in. |
| November | 29.5 °F | 48.3 °F | 3.32 in. |
| December | 20.4 °F | 36.8 °F | 3.37 in. |
| Annual | 36.5 °F | 58.2 °F | 44.01 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 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |