Geneseo, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 14.3 °C (high). Annual precipitation averages 866.4 Millimeters. Geneseo is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 0.3 °C | 52.32 mm |
| February | -8.2 °C | 1.3 °C | 42.16 mm |
| March | -4.3 °C | 5.9 °C | 59.44 mm |
| April | 1.7 °C | 13.3 °C | 71.88 mm |
| May | 8.1 °C | 20.4 °C | 76.45 mm |
| June | 13.3 °C | 25 °C | 89.92 mm |
| July | 15.8 °C | 27.3 °C | 100.33 mm |
| August | 14.8 °C | 26.4 °C | 86.11 mm |
| September | 10.9 °C | 22.9 °C | 79.76 mm |
| October | 5.3 °C | 15.9 °C | 84.33 mm |
| November | 0.1 °C | 9.1 °C | 65.53 mm |
| December | -4.6 °C | 3.3 °C | 58.17 mm |
| Annual | 3.7 °C | 14.3 °C | 866.4 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |