Glendo, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.8 °F (low) to 61.7 °F (high). Annual precipitation averages 12.4 Inches. Glendo is located in USDA Plant Hardiness Zone 5a. 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 | 13.6 °F | 39.4 °F | 0.28 in. |
| February | 15.5 °F | 41.5 °F | 0.39 in. |
| March | 23.6 °F | 51.0 °F | 0.71 in. |
| April | 30.8 °F | 58.0 °F | 1.61 in. |
| May | 40.4 °F | 67.5 °F | 2.44 in. |
| June | 49.7 °F | 79.2 °F | 1.9 in. |
| July | 55.9 °F | 88.3 °F | 1.26 in. |
| August | 53.6 °F | 86.7 °F | 0.88 in. |
| September | 43.7 °F | 77.2 °F | 0.98 in. |
| October | 31.3 °F | 62.5 °F | 1.1 in. |
| November | 21.6 °F | 49.2 °F | 0.44 in. |
| December | 14.1 °F | 39.6 °F | 0.36 in. |
| Annual | 32.8 °F | 61.7 °F | 12.35 in. |
| 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 5a : -20°F to -15°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 |