Spencerville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 65.6 °F (high). Annual precipitation averages 46.6 Inches. Spencerville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.2 °F | 42.2 °F | 3.19 in. |
| February | 26.7 °F | 45.5 °F | 2.84 in. |
| March | 33.6 °F | 54.1 °F | 4.11 in. |
| April | 43.8 °F | 66.4 °F | 3.58 in. |
| May | 53.9 °F | 74.9 °F | 4.54 in. |
| June | 62.2 °F | 83.1 °F | 4.6 in. |
| July | 67.0 °F | 87.2 °F | 4.4 in. |
| August | 65.3 °F | 85.2 °F | 3.75 in. |
| September | 58.7 °F | 78.5 °F | 4.57 in. |
| October | 46.9 °F | 67.2 °F | 3.97 in. |
| November | 36.8 °F | 56.1 °F | 3.25 in. |
| December | 29.7 °F | 46.3 °F | 3.81 in. |
| Annual | 45.8 °F | 65.6 °F | 46.61 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |