Delhi, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.4 °C (low) to 13.7 °C (high). Annual precipitation averages 1217.9 Millimeters. Delhi is located in USDA Plant Hardiness Zone 5b. 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 | -10.9 °C | -0.3 °C | 85.85 mm |
| February | -10.2 °C | 1.2 °C | 68.83 mm |
| March | -6.2 °C | 5.6 °C | 91.69 mm |
| April | -0.1 °C | 13.3 °C | 101.09 mm |
| May | 5.5 °C | 19.8 °C | 104.65 mm |
| June | 10.8 °C | 24.2 °C | 119.13 mm |
| July | 13.3 °C | 26.6 °C | 121.67 mm |
| August | 12.6 °C | 26 °C | 121.67 mm |
| September | 8.6 °C | 22.2 °C | 113.03 mm |
| October | 2.7 °C | 15.3 °C | 110.49 mm |
| November | -2.2 °C | 8.2 °C | 87.88 mm |
| December | -6.8 °C | 2.3 °C | 91.95 mm |
| Annual | 1.4 °C | 13.7 °C | 1217.93 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |