Big Flats, 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 58.9 °F (high). Annual precipitation averages 35.7 Inches. Big Flats is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.4 °F | 33.4 °F | 2.12 in. |
| February | 16.4 °F | 35.9 °F | 1.8 in. |
| March | 23.5 °F | 44.4 °F | 2.61 in. |
| April | 33.6 °F | 57.9 °F | 2.98 in. |
| May | 44.5 °F | 70.1 °F | 2.99 in. |
| June | 53.6 °F | 78.1 °F | 3.79 in. |
| July | 57.9 °F | 82.8 °F | 3.64 in. |
| August | 56.7 °F | 81.2 °F | 3.77 in. |
| September | 49.6 °F | 74.2 °F | 3.49 in. |
| October | 38.6 °F | 61.2 °F | 3.47 in. |
| November | 29.6 °F | 49.0 °F | 2.61 in. |
| December | 22.2 °F | 38.1 °F | 2.38 in. |
| Annual | 36.8 °F | 58.9 °F | 35.65 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |