Penfield, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 14.1 °C (high). Annual precipitation averages 893.6 Millimeters. Penfield 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 0.4 °C | 64.77 mm |
| February | -7.5 °C | 1.3 °C | 50.55 mm |
| March | -3.6 °C | 5.7 °C | 61.72 mm |
| April | 2.2 °C | 12.9 °C | 73.91 mm |
| May | 8.4 °C | 19.9 °C | 75.18 mm |
| June | 13.8 °C | 24.5 °C | 85.09 mm |
| July | 16.5 °C | 27.2 °C | 89.92 mm |
| August | 15.7 °C | 26.4 °C | 82.8 mm |
| September | 11.9 °C | 22.8 °C | 81.28 mm |
| October | 6 °C | 15.8 °C | 89.41 mm |
| November | 0.6 °C | 9.2 °C | 68.33 mm |
| December | -4.2 °C | 3.2 °C | 70.61 mm |
| Annual | 4.3 °C | 14.1 °C | 893.57 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |