| 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 |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 20662 - Nanjemoy, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 28 | 36 | 44 | 54 | 63 | 68 | 66 | 59 | 47 | 38 | 30 | 46 |
| Avg Max Temp (°F) | 45 | 48 | 57 | 68 | 76 | 84 | 87 | 86 | 79 | 69 | 58 | 48 | 67 |
| Avg Precip (In.) | 3.52 | 2.94 | 3.98 | 3.17 | 4.11 | 3.69 | 4.16 | 3.91 | 4.1 | 3.47 | 3.29 | 3.25 | 43.6 |