Flintstone, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.6 °F (low) to 64.3 °F (high). Annual precipitation averages 39.8 Inches. 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 | 22.4 °F | 39.6 °F | 2.7 in. |
| February | 23.7 °F | 43.2 °F | 2.37 in. |
| March | 30.2 °F | 52.1 °F | 3.33 in. |
| April | 39.7 °F | 65.6 °F | 3.5 in. |
| May | 49.1 °F | 74.3 °F | 4.37 in. |
| June | 57.8 °F | 82.0 °F | 4.11 in. |
| July | 62.0 °F | 86.4 °F | 3.58 in. |
| August | 60.2 °F | 84.9 °F | 3.36 in. |
| September | 53.3 °F | 78.4 °F | 3.66 in. |
| October | 42.0 °F | 66.6 °F | 3.0 in. |
| November | 32.7 °F | 54.2 °F | 2.78 in. |
| December | 26.6 °F | 43.7 °F | 3.04 in. |
| Annual | 41.6 °F | 64.3 °F | 39.8 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |