Rock Springs, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.6 °F (low) to 57.4 °F (high). Annual precipitation averages 10.2 Inches. Rock Springs is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.8 °F | 32.7 °F | 0.6 in. |
| February | 13.6 °F | 35.9 °F | 0.51 in. |
| March | 22.5 °F | 46.3 °F | 0.72 in. |
| April | 28.9 °F | 55.3 °F | 1.11 in. |
| May | 37.1 °F | 64.8 °F | 1.94 in. |
| June | 45.1 °F | 76.5 °F | 0.85 in. |
| July | 52.0 °F | 85.2 °F | 0.64 in. |
| August | 50.4 °F | 83.1 °F | 0.59 in. |
| September | 41.5 °F | 73.7 °F | 1.04 in. |
| October | 31.4 °F | 59.1 °F | 1.03 in. |
| November | 20.8 °F | 43.9 °F | 0.63 in. |
| December | 11.6 °F | 32.6 °F | 0.49 in. |
| Annual | 30.6 °F | 57.4 °F | 10.15 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |