Boswell, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.8 °F (low) to 74.2 °F (high). Annual precipitation averages 45.5 Inches. Boswell 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 | 29.9 °F | 52.9 °F | 2.57 in. |
| February | 33.9 °F | 57.5 °F | 2.92 in. |
| March | 41.7 °F | 65.4 °F | 4.05 in. |
| April | 49.4 °F | 73.5 °F | 4.27 in. |
| May | 59.4 °F | 80.6 °F | 6.13 in. |
| June | 67.8 °F | 88.8 °F | 4.42 in. |
| July | 71.1 °F | 93.7 °F | 3.0 in. |
| August | 69.9 °F | 94.3 °F | 2.91 in. |
| September | 62.8 °F | 87.5 °F | 3.61 in. |
| October | 50.8 °F | 76.5 °F | 4.54 in. |
| November | 40.5 °F | 64.8 °F | 3.59 in. |
| December | 32.7 °F | 55.0 °F | 3.44 in. |
| Annual | 50.8 °F | 74.2 °F | 45.45 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 |