Osage, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.8 °F (low) to 58.6 °F (high). Annual precipitation averages 17.4 Inches. 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 | 11.9 °F | 34.5 °F | 0.6 in. |
| February | 13.6 °F | 36.8 °F | 0.66 in. |
| March | 22.8 °F | 47.6 °F | 0.87 in. |
| April | 30.5 °F | 55.9 °F | 1.83 in. |
| May | 40.5 °F | 65.3 °F | 3.05 in. |
| June | 50.0 °F | 76.8 °F | 2.68 in. |
| July | 57.0 °F | 86.3 °F | 2.11 in. |
| August | 54.9 °F | 85.3 °F | 1.66 in. |
| September | 45.3 °F | 75.0 °F | 1.19 in. |
| October | 32.8 °F | 59.3 °F | 1.45 in. |
| November | 21.7 °F | 45.6 °F | 0.67 in. |
| December | 12.6 °F | 34.7 °F | 0.62 in. |
| Annual | 32.8 °F | 58.6 °F | 17.39 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |