Algonquin, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 66.6 °F (high). Annual precipitation averages 45.8 Inches. Algonquin is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.1 °F | 44.5 °F | 3.36 in. |
| February | 30.1 °F | 47.0 °F | 2.84 in. |
| March | 36.8 °F | 54.5 °F | 4.25 in. |
| April | 46.8 °F | 66.2 °F | 3.36 in. |
| May | 56.2 °F | 74.6 °F | 3.87 in. |
| June | 65.5 °F | 83.2 °F | 3.89 in. |
| July | 70.4 °F | 87.7 °F | 4.66 in. |
| August | 68.5 °F | 85.7 °F | 4.56 in. |
| September | 62.0 °F | 79.9 °F | 4.08 in. |
| October | 50.7 °F | 69.2 °F | 3.89 in. |
| November | 40.7 °F | 58.2 °F | 3.29 in. |
| December | 33.5 °F | 48.8 °F | 3.76 in. |
| Annual | 49.2 °F | 66.6 °F | 45.81 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |