Osage, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.4 °C (low) to 14.8 °C (high). Annual precipitation averages 441.7 Millimeters. Osage is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | 1.4 °C | 15.24 mm |
| February | -10.2 °C | 2.7 °C | 16.76 mm |
| March | -5.1 °C | 8.7 °C | 22.1 mm |
| April | -0.8 °C | 13.3 °C | 46.48 mm |
| May | 4.7 °C | 18.5 °C | 77.47 mm |
| June | 10 °C | 24.9 °C | 68.07 mm |
| July | 13.9 °C | 30.2 °C | 53.59 mm |
| August | 12.7 °C | 29.6 °C | 42.16 mm |
| September | 7.4 °C | 23.9 °C | 30.23 mm |
| October | 0.4 °C | 15.2 °C | 36.83 mm |
| November | -5.7 °C | 7.6 °C | 17.02 mm |
| December | -10.8 °C | 1.5 °C | 15.75 mm |
| Annual | 0.4 °C | 14.8 °C | 441.7 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |