Reisterstown, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.7 °F (low) to 64.8 °F (high). Annual precipitation averages 47.2 Inches. Reisterstown 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 | 24.0 °F | 40.8 °F | 3.48 in. |
| February | 25.8 °F | 43.9 °F | 2.82 in. |
| March | 32.4 °F | 52.7 °F | 4.17 in. |
| April | 42.6 °F | 65.5 °F | 3.74 in. |
| May | 51.9 °F | 74.7 °F | 4.37 in. |
| June | 61.1 °F | 82.9 °F | 4.13 in. |
| July | 65.6 °F | 87.1 °F | 4.5 in. |
| August | 63.9 °F | 85.0 °F | 3.58 in. |
| September | 57.3 °F | 78.4 °F | 4.9 in. |
| October | 45.9 °F | 66.6 °F | 4.27 in. |
| November | 36.3 °F | 55.0 °F | 3.32 in. |
| December | 29.0 °F | 44.9 °F | 3.94 in. |
| Annual | 44.7 °F | 64.8 °F | 47.22 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |