Broken Bow, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 23.6 °C (high). Annual precipitation averages 1355.8 Millimeters. Broken Bow 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 | -0.9 °C | 12.2 °C | 94.23 mm |
| February | 1.1 °C | 14.5 °C | 100.58 mm |
| March | 5 °C | 18.9 °C | 116.08 mm |
| April | 9.2 °C | 23.4 °C | 138.43 mm |
| May | 14.6 °C | 27.3 °C | 160.78 mm |
| June | 19.4 °C | 31.5 °C | 107.44 mm |
| July | 21.2 °C | 33.9 °C | 86.61 mm |
| August | 20.6 °C | 34.2 °C | 87.88 mm |
| September | 16.9 °C | 30.7 °C | 106.43 mm |
| October | 10.2 °C | 24.8 °C | 124.21 mm |
| November | 4.7 °C | 18.3 °C | 114.3 mm |
| December | 0.5 °C | 13.2 °C | 118.87 mm |
| Annual | 10.2 °C | 23.6 °C | 1355.84 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |