Horatio, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.6 °C (high). Annual precipitation averages 1369.8 Millimeters. Horatio 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 | -0.6 °C | 12.3 °C | 100.08 mm |
| February | 1.3 °C | 14.7 °C | 104.14 mm |
| March | 5.2 °C | 19.1 °C | 123.19 mm |
| April | 9.5 °C | 23.3 °C | 138.43 mm |
| May | 15.1 °C | 27.2 °C | 153.16 mm |
| June | 19.7 °C | 31.4 °C | 105.16 mm |
| July | 21.4 °C | 33.7 °C | 98.3 mm |
| August | 20.8 °C | 34 °C | 72.39 mm |
| September | 17 °C | 30.6 °C | 107.7 mm |
| October | 10.3 °C | 24.7 °C | 121.92 mm |
| November | 4.7 °C | 18.3 °C | 114.05 mm |
| December | 0.8 °C | 13.3 °C | 131.32 mm |
| Annual | 10.4 °C | 23.6 °C | 1369.84 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |