Dundalk, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.1 °F (low) to 65.2 °F (high). Annual precipitation averages 47.2 Inches. Dundalk is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.0 °F | 42.7 °F | 3.33 in. |
| February | 29.3 °F | 44.9 °F | 2.87 in. |
| March | 36.2 °F | 52.7 °F | 4.26 in. |
| April | 46.6 °F | 64.4 °F | 3.64 in. |
| May | 56.3 °F | 73.5 °F | 4.17 in. |
| June | 65.9 °F | 82.7 °F | 4.46 in. |
| July | 71.0 °F | 87.2 °F | 4.36 in. |
| August | 69.6 °F | 85.4 °F | 4.04 in. |
| September | 62.9 °F | 78.8 °F | 4.65 in. |
| October | 51.0 °F | 67.5 °F | 4.22 in. |
| November | 40.2 °F | 56.3 °F | 3.28 in. |
| December | 32.5 °F | 46.8 °F | 3.96 in. |
| Annual | 49.1 °F | 65.2 °F | 47.24 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |