Omaha, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 20.1 °C (high). Annual precipitation averages 1160 Millimeters. Omaha is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.8 °C | 7.6 °C | 63.5 mm |
| February | -1.2 °C | 10.1 °C | 67.31 mm |
| March | 3.1 °C | 14.9 °C | 106.43 mm |
| April | 8.2 °C | 20.2 °C | 133.86 mm |
| May | 13.4 °C | 24.3 °C | 121.67 mm |
| June | 18.2 °C | 29.2 °C | 101.09 mm |
| July | 20.3 °C | 31.6 °C | 100.33 mm |
| August | 19.4 °C | 31.1 °C | 83.82 mm |
| September | 15.1 °C | 27.2 °C | 117.35 mm |
| October | 8.9 °C | 21.2 °C | 93.22 mm |
| November | 3.4 °C | 14.7 °C | 95.76 mm |
| December | -1.1 °C | 9 °C | 75.69 mm |
| Annual | 8.7 °C | 20.1 °C | 1160.03 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |