Whitehaven, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 20.1 °C (high). Annual precipitation averages 1173.8 Millimeters. Whitehaven is located in USDA Plant Hardiness Zone 7b. 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 | -2.2 °C | 8.1 °C | 86.11 mm |
| February | -1.6 °C | 9.4 °C | 74.68 mm |
| March | 2 °C | 13.4 °C | 104.14 mm |
| April | 7.5 °C | 19.9 °C | 89.15 mm |
| May | 12.8 °C | 24.5 °C | 92.71 mm |
| June | 17.9 °C | 29.1 °C | 103.38 mm |
| July | 20.7 °C | 31.6 °C | 111.76 mm |
| August | 19.9 °C | 30.4 °C | 124.97 mm |
| September | 16.6 °C | 27.4 °C | 110.24 mm |
| October | 10.3 °C | 21.7 °C | 102.62 mm |
| November | 4.2 °C | 15.4 °C | 80.26 mm |
| December | 0.2 °C | 10.3 °C | 93.73 mm |
| Annual | 9 °C | 20.1 °C | 1173.75 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |