| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83c - Ontario Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 14541 - Romulus, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 16 | 25 | 36 | 46 | 56 | 61 | 59 | 52 | 41 | 33 | 22 | 39 |
| Avg Max Temp (°F) | 32 | 34 | 43 | 55 | 68 | 77 | 82 | 80 | 72 | 60 | 48 | 37 | 57 |
| Avg Precip (In.) | 1.95 | 1.71 | 2.32 | 2.98 | 3.06 | 3.8 | 3.34 | 3.37 | 3.85 | 3.05 | 3.07 | 2.41 | 34.9 |