Bairoil, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.8 °F (low) to 55.1 °F (high). Annual precipitation averages 11.9 Inches. 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 | 14.4 °F | 31.3 °F | 0.49 in. |
| February | 15.0 °F | 33.2 °F | 0.59 in. |
| March | 22.3 °F | 42.9 °F | 0.92 in. |
| April | 28.3 °F | 52.0 °F | 1.61 in. |
| May | 37.3 °F | 62.1 °F | 2.08 in. |
| June | 46.0 °F | 74.5 °F | 1.12 in. |
| July | 53.6 °F | 83.7 °F | 0.77 in. |
| August | 51.9 °F | 81.6 °F | 0.69 in. |
| September | 43.1 °F | 71.2 °F | 0.99 in. |
| October | 32.3 °F | 56.3 °F | 1.19 in. |
| November | 22.5 °F | 41.4 °F | 0.83 in. |
| December | 14.3 °F | 30.9 °F | 0.6 in. |
| Annual | 31.8 °F | 55.1 °F | 11.88 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |