| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| 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: | 63b - Chesapeake-Pamlico Lowlands and Tidal Marshes | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 21222 - Dundalk, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 28 | 35 | 44 | 54 | 63 | 68 | 67 | 60 | 47 | 38 | 30 | 47 |
| Avg Max Temp (°F) | 43 | 46 | 55 | 66 | 76 | 84 | 89 | 87 | 80 | 68 | 57 | 47 | 67 |
| Avg Precip (In.) | 3.58 | 3.07 | 4.13 | 3.3 | 4.41 | 3.67 | 4.04 | 4.07 | 4.19 | 3.42 | 3.51 | 3.61 | 45.01 |