| 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. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 84a - Cape Cod and Islands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02660 - South Dennis, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 23 | 30 | 38 | 48 | 57 | 63 | 62 | 56 | 45 | 37 | 28 | 42 |
| Avg Max Temp (°F) | 37 | 38 | 44 | 52 | 62 | 71 | 77 | 77 | 70 | 61 | 51 | 43 | 57 |
| Avg Precip (In.) | 4.15 | 3.55 | 4.07 | 3.86 | 3.45 | 3.31 | 3.03 | 3.49 | 3.63 | 4.04 | 4.02 | 4.31 | 44.9 |