Smithville Flats, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 14.1 °C (high). Annual precipitation averages 1134.1 Millimeters. Smithville Flats 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 | -9.8 °C | -0.1 °C | 74.93 mm |
| February | -9.3 °C | 1.2 °C | 65.53 mm |
| March | -5.4 °C | 5.7 °C | 83.06 mm |
| April | 0.9 °C | 13.4 °C | 97.28 mm |
| May | 7.1 °C | 20.3 °C | 97.54 mm |
| June | 12.2 °C | 24.9 °C | 116.84 mm |
| July | 14.7 °C | 27.1 °C | 106.68 mm |
| August | 13.9 °C | 26.5 °C | 117.6 mm |
| September | 9.9 °C | 22.7 °C | 106.17 mm |
| October | 4.1 °C | 15.8 °C | 101.09 mm |
| November | -1.1 °C | 8.6 °C | 85.09 mm |
| December | -5.6 °C | 2.7 °C | 82.3 mm |
| Annual | 2.6 °C | 14.1 °C | 1134.11 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |