Keedysville, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 18.6 °C (high). Annual precipitation averages 1064.3 Millimeters. Keedysville is located in USDA Plant Hardiness Zone 7a. 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 | -5 °C | 5.3 °C | 76.2 mm |
| February | -4.2 °C | 7.3 °C | 60.96 mm |
| March | -0.7 °C | 12 °C | 90.68 mm |
| April | 5.3 °C | 18.9 °C | 90.93 mm |
| May | 10.8 °C | 23.8 °C | 109.47 mm |
| June | 15.5 °C | 28.5 °C | 97.03 mm |
| July | 18 °C | 30.9 °C | 97.03 mm |
| August | 17.1 °C | 30 °C | 85.34 mm |
| September | 13.3 °C | 26.3 °C | 105.66 mm |
| October | 6.4 °C | 19.8 °C | 88.39 mm |
| November | 1.1 °C | 13.3 °C | 77.98 mm |
| December | -2.6 °C | 7.4 °C | 84.58 mm |
| Annual | 6.3 °C | 18.6 °C | 1064.25 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |