Bairoil, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.1 °C (low) to 12.8 °C (high). Annual precipitation averages 301.8 Millimeters. Bairoil is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | -0.4 °C | 12.45 mm |
| February | -9.4 °C | 0.7 °C | 14.99 mm |
| March | -5.4 °C | 6.1 °C | 23.37 mm |
| April | -2.1 °C | 11.1 °C | 40.89 mm |
| May | 2.9 °C | 16.7 °C | 52.83 mm |
| June | 7.8 °C | 23.6 °C | 28.45 mm |
| July | 12 °C | 28.7 °C | 19.56 mm |
| August | 11.1 °C | 27.6 °C | 17.53 mm |
| September | 6.2 °C | 21.8 °C | 25.15 mm |
| October | 0.2 °C | 13.5 °C | 30.23 mm |
| November | -5.3 °C | 5.2 °C | 21.08 mm |
| December | -9.8 °C | -0.6 °C | 15.24 mm |
| Annual | -0.1 °C | 12.8 °C | 301.77 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |