Manchester, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.6 °C (low) to 17.6 °C (high). Annual precipitation averages 1202.7 Millimeters. Manchester 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 | -3.9 °C | 3.9 °C | 87.38 mm |
| February | -2.9 °C | 5.9 °C | 71.37 mm |
| March | 0.6 °C | 10.8 °C | 102.87 mm |
| April | 6.4 °C | 18 °C | 95.25 mm |
| May | 11.4 °C | 23.2 °C | 106.43 mm |
| June | 16.6 °C | 27.6 °C | 101.35 mm |
| July | 19.1 °C | 30 °C | 115.57 mm |
| August | 18.1 °C | 28.9 °C | 102.11 mm |
| September | 14.6 °C | 25.3 °C | 131.32 mm |
| October | 8.6 °C | 18.8 °C | 105.92 mm |
| November | 3.2 °C | 12.1 °C | 84.07 mm |
| December | -1.1 °C | 6.3 °C | 99.06 mm |
| Annual | 7.6 °C | 17.6 °C | 1202.7 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |