Towson, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.3 °F (low) to 65.5 °F (high). Annual precipitation averages 48.9 Inches. Towson is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.6 °F | 42.3 °F | 3.47 in. |
| February | 26.0 °F | 45.1 °F | 2.94 in. |
| March | 32.8 °F | 53.5 °F | 4.36 in. |
| April | 43.2 °F | 65.7 °F | 3.84 in. |
| May | 52.9 °F | 74.6 °F | 4.34 in. |
| June | 62.0 °F | 83.0 °F | 4.3 in. |
| July | 67.0 °F | 87.3 °F | 4.53 in. |
| August | 65.1 °F | 85.5 °F | 4.26 in. |
| September | 58.4 °F | 78.7 °F | 4.79 in. |
| October | 46.6 °F | 67.4 °F | 4.5 in. |
| November | 36.3 °F | 56.1 °F | 3.45 in. |
| December | 29.2 °F | 46.2 °F | 4.12 in. |
| Annual | 45.3 °F | 65.5 °F | 48.9 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |