Rosston, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.8 °F (low) to 74.7 °F (high). Annual precipitation averages 54.2 Inches. Rosston is located in USDA Plant Hardiness Zone 8b. 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 | 32.4 °F | 54.4 °F | 4.15 in. |
| February | 35.5 °F | 58.6 °F | 4.53 in. |
| March | 42.8 °F | 66.8 °F | 5.29 in. |
| April | 50.4 °F | 75.0 °F | 5.49 in. |
| May | 60.0 °F | 81.9 °F | 5.61 in. |
| June | 67.9 °F | 89.2 °F | 4.23 in. |
| July | 71.1 °F | 92.9 °F | 3.61 in. |
| August | 70.1 °F | 93.0 °F | 3.26 in. |
| September | 63.5 °F | 87.3 °F | 3.71 in. |
| October | 51.5 °F | 76.7 °F | 4.75 in. |
| November | 41.4 °F | 64.8 °F | 4.18 in. |
| December | 34.8 °F | 56.3 °F | 5.34 in. |
| Annual | 51.8 °F | 74.7 °F | 54.15 in. |
| 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |