Tillar, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.9 °C (low) to 23.2 °C (high). Annual precipitation averages 1365.5 Millimeters. Tillar is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.1 °C | 11.1 °C | 126.24 mm |
| February | 2.7 °C | 13.8 °C | 122.43 mm |
| March | 7 °C | 18.5 °C | 131.57 mm |
| April | 11.7 °C | 23.5 °C | 150.37 mm |
| May | 16.9 °C | 27.9 °C | 127 mm |
| June | 21 °C | 31.7 °C | 85.85 mm |
| July | 22.6 °C | 33.1 °C | 89.66 mm |
| August | 21.6 °C | 33.1 °C | 82.8 mm |
| September | 17.9 °C | 30.4 °C | 82.3 mm |
| October | 11.4 °C | 24.8 °C | 105.92 mm |
| November | 6.1 °C | 17.9 °C | 114.81 mm |
| December | 2.6 °C | 12.6 °C | 146.56 mm |
| Annual | 11.9 °C | 23.2 °C | 1365.51 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |