Secretary, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 19.5 °C (high). Annual precipitation averages 1152.4 Millimeters. 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 | -2.2 °C | 7.2 °C | 84.84 mm |
| February | -1.6 °C | 8.6 °C | 72.39 mm |
| March | 1.9 °C | 12.8 °C | 105.41 mm |
| April | 7.6 °C | 19.3 °C | 87.88 mm |
| May | 12.8 °C | 23.9 °C | 96.27 mm |
| June | 18 °C | 28.8 °C | 103.63 mm |
| July | 20.6 °C | 31.2 °C | 110.49 mm |
| August | 19.4 °C | 30.1 °C | 116.33 mm |
| September | 15.8 °C | 26.9 °C | 100.08 mm |
| October | 9.7 °C | 21 °C | 98.55 mm |
| November | 4.1 °C | 14.8 °C | 81.03 mm |
| December | 0.2 °C | 9.6 °C | 95.5 mm |
| Annual | 8.9 °C | 19.5 °C | 1152.4 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |