Lewiston, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 14.6 °C (high). Annual precipitation averages 908.3 Millimeters. Lewiston is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 0.7 °C | 71.63 mm |
| February | -6.4 °C | 1.4 °C | 59.69 mm |
| March | -2.8 °C | 5.9 °C | 67.31 mm |
| April | 2.5 °C | 13.3 °C | 80.77 mm |
| May | 8.6 °C | 20.4 °C | 76.71 mm |
| June | 14.2 °C | 25.4 °C | 84.07 mm |
| July | 17.2 °C | 27.8 °C | 71.37 mm |
| August | 16.6 °C | 27.1 °C | 77.22 mm |
| September | 12.9 °C | 23.4 °C | 87.12 mm |
| October | 6.9 °C | 16.2 °C | 88.14 mm |
| November | 1.9 °C | 9.4 °C | 77.22 mm |
| December | -2.9 °C | 3.7 °C | 67.06 mm |
| Annual | 5.2 °C | 14.6 °C | 908.31 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |