Robertson, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 28.4 °F (low) to 54.8 °F (high). Annual precipitation averages 11.9 Inches. Robertson is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.5 °F | 33.4 °F | 0.64 in. |
| February | 12.3 °F | 34.6 °F | 0.67 in. |
| March | 19.7 °F | 43.3 °F | 0.84 in. |
| April | 25.9 °F | 51.8 °F | 1.19 in. |
| May | 34.1 °F | 61.3 °F | 1.54 in. |
| June | 41.4 °F | 72.0 °F | 1.02 in. |
| July | 48.6 °F | 80.5 °F | 1.1 in. |
| August | 47.6 °F | 78.9 °F | 1.0 in. |
| September | 39.4 °F | 69.9 °F | 1.21 in. |
| October | 29.7 °F | 56.8 °F | 1.14 in. |
| November | 19.2 °F | 42.4 °F | 0.86 in. |
| December | 11.6 °F | 32.9 °F | 0.71 in. |
| Annual | 28.4 °F | 54.8 °F | 11.92 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |