Baltimore, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.2 °F (low) to 66.1 °F (high). Annual precipitation averages 47.6 Inches. Baltimore 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.5 °F | 43.2 °F | 3.39 in. |
| February | 28.9 °F | 45.6 °F | 2.91 in. |
| March | 35.6 °F | 53.7 °F | 4.32 in. |
| April | 46.0 °F | 65.4 °F | 3.74 in. |
| May | 55.6 °F | 74.5 °F | 4.14 in. |
| June | 64.9 °F | 83.8 °F | 4.47 in. |
| July | 69.9 °F | 88.2 °F | 4.28 in. |
| August | 68.0 °F | 86.2 °F | 4.04 in. |
| September | 61.3 °F | 79.5 °F | 4.66 in. |
| October | 49.5 °F | 68.1 °F | 4.32 in. |
| November | 39.2 °F | 57.0 °F | 3.34 in. |
| December | 32.0 °F | 47.5 °F | 4.0 in. |
| Annual | 48.2 °F | 66.1 °F | 47.61 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |