Forestville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.9 °F (low) to 65.9 °F (high). Annual precipitation averages 45.3 Inches. Forestville is located in USDA Plant Hardiness Zone 7b. 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 | 26.3 °F | 43.3 °F | 3.03 in. |
| February | 27.7 °F | 46.4 °F | 2.65 in. |
| March | 34.6 °F | 54.5 °F | 3.93 in. |
| April | 44.8 °F | 65.9 °F | 3.44 in. |
| May | 54.4 °F | 74.3 °F | 4.33 in. |
| June | 63.6 °F | 82.8 °F | 4.58 in. |
| July | 68.4 °F | 87.4 °F | 4.65 in. |
| August | 66.6 °F | 85.7 °F | 3.64 in. |
| September | 59.9 °F | 79.1 °F | 4.43 in. |
| October | 47.9 °F | 67.6 °F | 3.82 in. |
| November | 37.6 °F | 56.9 °F | 3.08 in. |
| December | 30.6 °F | 47.3 °F | 3.73 in. |
| Annual | 46.9 °F | 65.9 °F | 45.31 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 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 |