Fairlee, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 18.5 °C (high). Annual precipitation averages 1160.5 Millimeters. Fairlee 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 5.8 °C | 83.57 mm |
| February | -2.1 °C | 7.2 °C | 70.36 mm |
| March | 1.7 °C | 11.7 °C | 103.89 mm |
| April | 7.4 °C | 18.1 °C | 89.15 mm |
| May | 12.7 °C | 23.2 °C | 104.9 mm |
| June | 18 °C | 28.1 °C | 111.51 mm |
| July | 20.8 °C | 30.6 °C | 108.97 mm |
| August | 20 °C | 29.9 °C | 104.14 mm |
| September | 16.2 °C | 26.3 °C | 113.28 mm |
| October | 9.7 °C | 19.9 °C | 98.04 mm |
| November | 3.9 °C | 13.4 °C | 77.72 mm |
| December | -0.1 °C | 8.2 °C | 95 mm |
| Annual | 8.8 °C | 18.5 °C | 1160.53 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |