Fort Smith, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.2 °F (low) to 72.7 °F (high). Annual precipitation averages 48.6 Inches. Fort Smith is located in USDA Plant Hardiness Zone 8a. 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 | 28.7 °F | 50.5 °F | 3.19 in. |
| February | 32.3 °F | 55.1 °F | 2.82 in. |
| March | 40.2 °F | 63.7 °F | 4.32 in. |
| April | 48.8 °F | 72.8 °F | 4.85 in. |
| May | 59.1 °F | 79.9 °F | 5.74 in. |
| June | 67.8 °F | 88.2 °F | 4.39 in. |
| July | 71.5 °F | 93.1 °F | 3.61 in. |
| August | 70.2 °F | 92.8 °F | 3.76 in. |
| September | 62.5 °F | 85.8 °F | 3.99 in. |
| October | 50.1 °F | 75.1 °F | 4.11 in. |
| November | 39.3 °F | 63.1 °F | 4.07 in. |
| December | 31.6 °F | 52.7 °F | 3.71 in. |
| Annual | 50.2 °F | 72.7 °F | 48.56 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |