Monrovia, 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 64.3 °F (high). Annual precipitation averages 45.3 Inches. Monrovia is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.6 °F | 40.6 °F | 3.15 in. |
| February | 26.2 °F | 43.9 °F | 2.64 in. |
| March | 32.7 °F | 52.6 °F | 3.84 in. |
| April | 42.5 °F | 64.8 °F | 3.47 in. |
| May | 52.4 °F | 73.5 °F | 4.25 in. |
| June | 61.2 °F | 82.0 °F | 4.36 in. |
| July | 65.9 °F | 86.3 °F | 4.57 in. |
| August | 64.0 °F | 84.3 °F | 3.42 in. |
| September | 57.5 °F | 77.7 °F | 4.58 in. |
| October | 46.0 °F | 66.1 °F | 3.93 in. |
| November | 36.1 °F | 54.9 °F | 3.35 in. |
| December | 29.1 °F | 44.7 °F | 3.74 in. |
| Annual | 44.9 °F | 64.3 °F | 45.3 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |