McCoole, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 18.1 °C (high). Annual precipitation averages 982 Millimeters. McCoole 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 | -5.3 °C | 4.4 °C | 69.85 mm |
| February | -4.7 °C | 6.4 °C | 63.25 mm |
| March | -1.1 °C | 11.2 °C | 88.39 mm |
| April | 3.9 °C | 19.1 °C | 87.12 mm |
| May | 9.1 °C | 23.8 °C | 108.2 mm |
| June | 14.1 °C | 28 °C | 102.11 mm |
| July | 16.5 °C | 30.4 °C | 96.77 mm |
| August | 15.6 °C | 29.7 °C | 81.79 mm |
| September | 11.8 °C | 26.1 °C | 89.92 mm |
| October | 5.6 °C | 19.4 °C | 61.21 mm |
| November | 0.2 °C | 12.4 °C | 61.72 mm |
| December | -3.2 °C | 6.6 °C | 71.63 mm |
| Annual | 5.2 °C | 18.1 °C | 981.96 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |