Boise City, Oklahoma has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.3 °C (low) to 21.3 °C (high). Annual precipitation averages 444.7 Millimeters. Boise City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 9.7 °C | 8.64 mm |
| February | -5.8 °C | 11.2 °C | 8.13 mm |
| March | -1.8 °C | 16.2 °C | 23.11 mm |
| April | 2.6 °C | 20.4 °C | 35.81 mm |
| May | 8.3 °C | 25.7 °C | 49.78 mm |
| June | 14.1 °C | 31.3 °C | 59.18 mm |
| July | 17 °C | 33.6 °C | 72.64 mm |
| August | 16.2 °C | 32.1 °C | 83.82 mm |
| September | 11.7 °C | 28.4 °C | 39.12 mm |
| October | 4.4 °C | 22 °C | 39.37 mm |
| November | -2 °C | 15.1 °C | 11.68 mm |
| December | -6.6 °C | 9.4 °C | 13.46 mm |
| Annual | 4.3 °C | 21.3 °C | 444.74 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |