Westminster, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.9 °F (low) to 64.2 °F (high). Annual precipitation averages 45.6 Inches. Westminster 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 | 39.7 °F | 3.34 in. |
| February | 25.7 °F | 43.1 °F | 2.6 in. |
| March | 32.4 °F | 51.9 °F | 3.89 in. |
| April | 42.8 °F | 64.6 °F | 3.53 in. |
| May | 52.1 °F | 74.1 °F | 4.12 in. |
| June | 61.5 °F | 82.5 °F | 3.97 in. |
| July | 66.0 °F | 86.9 °F | 4.48 in. |
| August | 64.3 °F | 84.8 °F | 3.79 in. |
| September | 57.6 °F | 78.1 °F | 4.98 in. |
| October | 46.3 °F | 66.1 °F | 3.94 in. |
| November | 36.5 °F | 54.4 °F | 3.16 in. |
| December | 29.0 °F | 44.1 °F | 3.76 in. |
| Annual | 44.9 °F | 64.2 °F | 45.56 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |