Bivalve, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 19.5 °C (high). Annual precipitation averages 1167.4 Millimeters. Bivalve is located in USDA Plant Hardiness Zone 8a. 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 | -1.7 °C | 7.4 °C | 85.6 mm |
| February | -1.2 °C | 8.7 °C | 74.42 mm |
| March | 2.6 °C | 12.8 °C | 104.14 mm |
| April | 8.2 °C | 19.3 °C | 88.65 mm |
| May | 13.7 °C | 23.9 °C | 94.74 mm |
| June | 18.8 °C | 28.7 °C | 104.14 mm |
| July | 21.6 °C | 31.1 °C | 111.76 mm |
| August | 20.7 °C | 30 °C | 119.63 mm |
| September | 17.3 °C | 26.9 °C | 107.19 mm |
| October | 11 °C | 21.1 °C | 101.09 mm |
| November | 4.9 °C | 14.8 °C | 81.53 mm |
| December | 0.8 °C | 9.7 °C | 94.49 mm |
| Annual | 9.7 °C | 19.5 °C | 1167.38 mm |
| 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |