East Thermopolis, Wyoming has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 30.8 °F (low) to 61.8 °F (high). Annual precipitation averages 12.5 Inches. East Thermopolis is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °F | 35.0 °F | 0.38 in. |
| February | 11.5 °F | 39.4 °F | 0.45 in. |
| March | 22.5 °F | 52.2 °F | 0.94 in. |
| April | 30.8 °F | 60.3 °F | 1.66 in. |
| May | 40.6 °F | 69.8 °F | 2.59 in. |
| June | 48.6 °F | 81.2 °F | 1.4 in. |
| July | 55.0 °F | 90.2 °F | 0.75 in. |
| August | 52.2 °F | 88.9 °F | 0.55 in. |
| September | 42.7 °F | 78.4 °F | 1.29 in. |
| October | 31.1 °F | 63.1 °F | 1.3 in. |
| November | 18.4 °F | 46.9 °F | 0.61 in. |
| December | 8.9 °F | 35.7 °F | 0.54 in. |
| Annual | 30.8 °F | 61.8 °F | 12.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | BWk - Cold Desert Climate |