Lonetree, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.6 °C (low) to 12.6 °C (high). Annual precipitation averages 276.6 Millimeters. Lonetree is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | 1.2 °C | 13.21 mm |
| February | -11.6 °C | 1.9 °C | 14.99 mm |
| March | -7.6 °C | 6.6 °C | 19.3 mm |
| April | -4 °C | 10.8 °C | 27.18 mm |
| May | 0.6 °C | 15.9 °C | 27.43 mm |
| June | 4.4 °C | 22.1 °C | 27.43 mm |
| July | 8.4 °C | 26.6 °C | 30.73 mm |
| August | 8 °C | 25.7 °C | 27.69 mm |
| September | 3.4 °C | 20.7 °C | 28.96 mm |
| October | -1.7 °C | 13.4 °C | 28.96 mm |
| November | -7.4 °C | 5.9 °C | 17.02 mm |
| December | -12 °C | 0.8 °C | 13.72 mm |
| Annual | -2.6 °C | 12.6 °C | 276.62 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |