Romulus, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 57.5 °F (high). Annual precipitation averages 37.2 Inches. Romulus 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 | 17.5 °F | 32.4 °F | 2.25 in. |
| February | 18.2 °F | 34.4 °F | 1.87 in. |
| March | 25.1 °F | 42.6 °F | 2.63 in. |
| April | 35.7 °F | 55.9 °F | 3.14 in. |
| May | 47.2 °F | 68.6 °F | 3.24 in. |
| June | 56.8 °F | 76.8 °F | 3.82 in. |
| July | 61.6 °F | 81.1 °F | 3.94 in. |
| August | 60.0 °F | 79.7 °F | 3.52 in. |
| September | 53.0 °F | 73.0 °F | 3.59 in. |
| October | 42.7 °F | 60.2 °F | 3.7 in. |
| November | 33.0 °F | 48.2 °F | 2.9 in. |
| December | 24.3 °F | 37.6 °F | 2.62 in. |
| Annual | 39.6 °F | 57.5 °F | 37.22 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 |