Flintstone, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 17.9 °C (high). Annual precipitation averages 1010.9 Millimeters. Flintstone 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 | -5.3 °C | 4.2 °C | 68.58 mm |
| February | -4.6 °C | 6.2 °C | 60.2 mm |
| March | -1 °C | 11.2 °C | 84.58 mm |
| April | 4.3 °C | 18.7 °C | 88.9 mm |
| May | 9.5 °C | 23.5 °C | 111 mm |
| June | 14.3 °C | 27.8 °C | 104.39 mm |
| July | 16.7 °C | 30.2 °C | 90.93 mm |
| August | 15.7 °C | 29.4 °C | 85.34 mm |
| September | 11.8 °C | 25.8 °C | 92.96 mm |
| October | 5.6 °C | 19.2 °C | 76.2 mm |
| November | 0.4 °C | 12.3 °C | 70.61 mm |
| December | -3 °C | 6.5 °C | 77.22 mm |
| Annual | 5.4 °C | 17.9 °C | 1010.91 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |