| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 65n - Chesapeake Rolling Coastal Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 20722 - Brentwood, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 27 | 34 | 43 | 53 | 62 | 67 | 65 | 58 | 46 | 37 | 29 | 45 |
| Avg Max Temp (°F) | 43 | 46 | 55 | 66 | 75 | 83 | 88 | 86 | 79 | 69 | 57 | 47 | 66 |
| Avg Precip (In.) | 3.46 | 2.85 | 3.83 | 3.25 | 4.46 | 3.69 | 4.25 | 3.95 | 4.12 | 3.45 | 3.34 | 3.3 | 43.93 |