Altheimer, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 22.7 °C (high). Annual precipitation averages 1337.6 Millimeters. Altheimer 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 | 0.5 °C | 10.4 °C | 104.9 mm |
| February | 2.2 °C | 13.1 °C | 111.76 mm |
| March | 6.3 °C | 17.8 °C | 132.08 mm |
| April | 11 °C | 23.1 °C | 146.3 mm |
| May | 16.4 °C | 27.3 °C | 126.24 mm |
| June | 20.8 °C | 31.5 °C | 87.12 mm |
| July | 22.4 °C | 33 °C | 90.42 mm |
| August | 21.6 °C | 32.7 °C | 83.06 mm |
| September | 17.7 °C | 29.8 °C | 86.36 mm |
| October | 11.1 °C | 24.1 °C | 112.27 mm |
| November | 5.5 °C | 17.1 °C | 113.54 mm |
| December | 1.9 °C | 12 °C | 143.51 mm |
| Annual | 11.5 °C | 22.7 °C | 1337.56 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |