Black Rock, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 21 °C (high). Annual precipitation averages 1327.2 Millimeters. Black Rock is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.1 °C | 7.7 °C | 105.16 mm |
| February | -0.3 °C | 10.4 °C | 106.43 mm |
| March | 4.1 °C | 15.7 °C | 123.19 mm |
| April | 9.3 °C | 21.4 °C | 135.13 mm |
| May | 15 °C | 26.1 °C | 139.19 mm |
| June | 19.7 °C | 30.7 °C | 91.44 mm |
| July | 21.6 °C | 32.3 °C | 92.71 mm |
| August | 20.3 °C | 31.7 °C | 100.84 mm |
| September | 15.9 °C | 28.3 °C | 92.96 mm |
| October | 9.2 °C | 22.7 °C | 104.9 mm |
| November | 3.7 °C | 15.2 °C | 124.97 mm |
| December | -0.4 °C | 9.2 °C | 110.24 mm |
| Annual | 9.7 °C | 21 °C | 1327.16 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |