Three Mile Bay, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 54.2 °F (high). Annual precipitation averages 40.2 Inches. Three Mile Bay is located in USDA Plant Hardiness Zone 5a. 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 | 12.1 °F | 28.0 °F | 3.41 in. |
| February | 12.8 °F | 29.8 °F | 2.62 in. |
| March | 22.1 °F | 38.2 °F | 2.7 in. |
| April | 34.7 °F | 51.9 °F | 3.36 in. |
| May | 46.3 °F | 64.3 °F | 3.22 in. |
| June | 56.1 °F | 73.3 °F | 3.41 in. |
| July | 61.9 °F | 78.3 °F | 3.1 in. |
| August | 60.4 °F | 77.6 °F | 3.29 in. |
| September | 52.9 °F | 70.6 °F | 3.58 in. |
| October | 42.3 °F | 57.8 °F | 4.27 in. |
| November | 31.7 °F | 46.0 °F | 3.69 in. |
| December | 20.9 °F | 34.6 °F | 3.55 in. |
| Annual | 37.9 °F | 54.2 °F | 40.2 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |