Rison, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.1 °C (high). Annual precipitation averages 1415.3 Millimeters. Rison is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.3 °C | 11.4 °C | 111.51 mm |
| February | 1.9 °C | 13.9 °C | 117.6 mm |
| March | 6 °C | 18.6 °C | 139.7 mm |
| April | 10.6 °C | 23.6 °C | 142.75 mm |
| May | 15.8 °C | 27.4 °C | 130.05 mm |
| June | 20.2 °C | 31.5 °C | 94.23 mm |
| July | 21.9 °C | 33.2 °C | 105.41 mm |
| August | 21.3 °C | 33.1 °C | 96.77 mm |
| September | 17.5 °C | 30 °C | 93.47 mm |
| October | 10.8 °C | 24.3 °C | 127.76 mm |
| November | 5.2 °C | 17.7 °C | 113.03 mm |
| December | 1.7 °C | 12.8 °C | 143 mm |
| Annual | 11.1 °C | 23.1 °C | 1415.28 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |