Waterloo, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.9 °F (low) to 57.9 °F (high). Annual precipitation averages 36.3 Inches. Waterloo 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 | 18.1 °F | 32.8 °F | 2.13 in. |
| February | 19.1 °F | 34.4 °F | 1.77 in. |
| March | 25.8 °F | 42.6 °F | 2.46 in. |
| April | 36.2 °F | 56.0 °F | 2.99 in. |
| May | 47.4 °F | 68.9 °F | 3.25 in. |
| June | 56.9 °F | 77.6 °F | 3.89 in. |
| July | 61.7 °F | 82.1 °F | 3.85 in. |
| August | 60.1 °F | 80.6 °F | 3.55 in. |
| September | 53.3 °F | 73.4 °F | 3.42 in. |
| October | 42.6 °F | 60.7 °F | 3.62 in. |
| November | 33.2 °F | 48.5 °F | 2.87 in. |
| December | 24.7 °F | 37.7 °F | 2.5 in. |
| Annual | 39.9 °F | 57.9 °F | 36.3 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |