Cowley, Wyoming has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from -0.2 °C (low) to 15.2 °C (high). Annual precipitation averages 176.5 Millimeters. Cowley is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.1 °C | 0.1 °C | 5.84 mm |
| February | -10.6 °C | 3 °C | 6.86 mm |
| March | -5.1 °C | 10 °C | 7.11 mm |
| April | -0.4 °C | 14.7 °C | 18.54 mm |
| May | 5.1 °C | 19.9 °C | 30.23 mm |
| June | 9.7 °C | 26 °C | 30.48 mm |
| July | 13.1 °C | 31.4 °C | 18.29 mm |
| August | 11.6 °C | 30.4 °C | 8.89 mm |
| September | 6.2 °C | 23.9 °C | 20.57 mm |
| October | -0.1 °C | 15.2 °C | 18.29 mm |
| November | -6.4 °C | 7 °C | 6.35 mm |
| December | -11.9 °C | 0.9 °C | 5.08 mm |
| Annual | -0.2 °C | 15.2 °C | 176.53 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |