| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F | |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 65n - Chesapeake Rolling Coastal Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 20640 - Indian Head, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 28 | 35 | 43 | 53 | 62 | 67 | 66 | 59 | 46 | 38 | 30 | 46 |
| Avg Max Temp (°F) | 44 | 48 | 57 | 68 | 76 | 84 | 87 | 86 | 79 | 69 | 58 | 48 | 67 |
| Avg Precip (In.) | 3.46 | 2.87 | 3.91 | 3.18 | 4.12 | 3.72 | 4.11 | 4.04 | 4.16 | 3.41 | 3.29 | 3.23 | 43.5 |