Groton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.8 °F (low) to 56.3 °F (high). Annual precipitation averages 43.4 Inches. Groton 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 | 14.1 °F | 31.0 °F | 2.68 in. |
| February | 15.3 °F | 33.3 °F | 2.24 in. |
| March | 22.3 °F | 40.9 °F | 2.96 in. |
| April | 33.7 °F | 54.4 °F | 3.7 in. |
| May | 44.9 °F | 67.3 °F | 3.59 in. |
| June | 54.1 °F | 75.5 °F | 4.67 in. |
| July | 58.7 °F | 79.8 °F | 4.21 in. |
| August | 57.1 °F | 78.6 °F | 4.31 in. |
| September | 49.9 °F | 71.9 °F | 4.18 in. |
| October | 39.6 °F | 59.1 °F | 4.16 in. |
| November | 30.6 °F | 47.0 °F | 3.56 in. |
| December | 21.7 °F | 36.2 °F | 3.15 in. |
| Annual | 36.8 °F | 56.3 °F | 43.41 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |