Highland, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.1 °F (low) to 65.8 °F (high). Annual precipitation averages 47 Inches. Highland 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 | 24.7 °F | 42.2 °F | 3.24 in. |
| February | 25.9 °F | 45.5 °F | 2.92 in. |
| March | 33.0 °F | 54.1 °F | 4.16 in. |
| April | 42.9 °F | 66.5 °F | 3.64 in. |
| May | 53.0 °F | 75.0 °F | 4.52 in. |
| June | 61.5 °F | 83.4 °F | 4.58 in. |
| July | 66.2 °F | 87.6 °F | 4.42 in. |
| August | 64.5 °F | 85.6 °F | 3.78 in. |
| September | 57.8 °F | 79.0 °F | 4.59 in. |
| October | 45.9 °F | 67.5 °F | 4.02 in. |
| November | 36.1 °F | 56.3 °F | 3.32 in. |
| December | 29.1 °F | 46.3 °F | 3.83 in. |
| Annual | 45.1 °F | 65.8 °F | 47.02 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |