Harrell, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.3 °F (low) to 74.5 °F (high). Annual precipitation averages 55.6 Inches. Harrell is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.0 °F | 54.0 °F | 4.71 in. |
| February | 35.0 °F | 58.3 °F | 4.74 in. |
| March | 42.1 °F | 66.7 °F | 5.58 in. |
| April | 50.3 °F | 75.2 °F | 5.79 in. |
| May | 59.9 °F | 81.8 °F | 5.02 in. |
| June | 67.6 °F | 88.9 °F | 3.94 in. |
| July | 70.8 °F | 92.1 °F | 3.84 in. |
| August | 69.3 °F | 92.2 °F | 3.69 in. |
| September | 62.8 °F | 86.9 °F | 3.61 in. |
| October | 50.4 °F | 76.5 °F | 4.61 in. |
| November | 40.4 °F | 64.7 °F | 4.3 in. |
| December | 34.6 °F | 56.1 °F | 5.73 in. |
| Annual | 51.3 °F | 74.5 °F | 55.56 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |