| 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 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 21904 - Port Deposit, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 24 | 32 | 41 | 51 | 60 | 65 | 64 | 57 | 44 | 35 | 27 | 44 |
| Avg Max Temp (°F) | 40 | 44 | 53 | 64 | 74 | 82 | 87 | 85 | 78 | 67 | 55 | 45 | 64 |
| Avg Precip (In.) | 3.87 | 2.87 | 4.07 | 3.63 | 4.52 | 4.14 | 4.23 | 4.34 | 4.71 | 3.44 | 3.67 | 3.79 | 47.27 |