| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 84a - Cape Cod and Islands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 11971 - Southold, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 24 | 31 | 39 | 49 | 59 | 65 | 64 | 57 | 47 | 38 | 29 | 44 |
| Avg Max Temp (°F) | 38 | 39 | 47 | 56 | 67 | 75 | 81 | 80 | 73 | 63 | 53 | 43 | 60 |
| Avg Precip (In.) | 4.17 | 3.45 | 4.08 | 4.16 | 3.54 | 3.75 | 3.28 | 4.52 | 3.59 | 3.77 | 4.15 | 3.98 | 46.43 |