Star Valley Ranch, Wyoming has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 25.1 °F (low) to 53.6 °F (high). Annual precipitation averages 25.9 Inches. Star Valley Ranch is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °F | 29.4 °F | 2.47 in. |
| February | 8.5 °F | 33.3 °F | 2.4 in. |
| March | 16.6 °F | 42.2 °F | 2.04 in. |
| April | 24.9 °F | 49.7 °F | 2.52 in. |
| May | 33.4 °F | 61.1 °F | 3.31 in. |
| June | 38.4 °F | 70.6 °F | 2.08 in. |
| July | 43.3 °F | 80.6 °F | 1.02 in. |
| August | 42.2 °F | 79.8 °F | 1.33 in. |
| September | 34.8 °F | 70.6 °F | 1.81 in. |
| October | 27.0 °F | 55.6 °F | 2.0 in. |
| November | 17.1 °F | 41.0 °F | 2.27 in. |
| December | 8.0 °F | 29.4 °F | 2.67 in. |
| Annual | 25.1 °F | 53.6 °F | 25.92 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 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 | Dfc - Subarctic With Cool Summers And Year Around Rainfall |