Secretary, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 67.1 °F (high). Annual precipitation averages 45.4 Inches. Secretary 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.1 °F | 45.0 °F | 3.34 in. |
| February | 29.1 °F | 47.5 °F | 2.85 in. |
| March | 35.5 °F | 55.1 °F | 4.15 in. |
| April | 45.6 °F | 66.7 °F | 3.46 in. |
| May | 55.1 °F | 75.0 °F | 3.79 in. |
| June | 64.4 °F | 83.9 °F | 4.08 in. |
| July | 69.1 °F | 88.1 °F | 4.35 in. |
| August | 66.9 °F | 86.1 °F | 4.58 in. |
| September | 60.5 °F | 80.4 °F | 3.94 in. |
| October | 49.4 °F | 69.8 °F | 3.88 in. |
| November | 39.3 °F | 58.7 °F | 3.19 in. |
| December | 32.3 °F | 49.2 °F | 3.76 in. |
| Annual | 47.9 °F | 67.1 °F | 45.37 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |