Hartrandt, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 60.1 °F (high). Annual precipitation averages 15.4 Inches. Hartrandt 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.5 °F | 36.9 °F | 0.63 in. |
| February | 17.2 °F | 38.7 °F | 0.79 in. |
| March | 24.3 °F | 49.0 °F | 1.22 in. |
| April | 30.2 °F | 56.5 °F | 1.95 in. |
| May | 39.2 °F | 66.4 °F | 2.85 in. |
| June | 47.8 °F | 79.0 °F | 1.53 in. |
| July | 55.2 °F | 88.2 °F | 1.17 in. |
| August | 53.1 °F | 86.5 °F | 0.95 in. |
| September | 43.5 °F | 75.8 °F | 1.16 in. |
| October | 32.8 °F | 60.4 °F | 1.6 in. |
| November | 23.6 °F | 46.8 °F | 0.79 in. |
| December | 16.7 °F | 36.8 °F | 0.73 in. |
| Annual | 33.3 °F | 60.1 °F | 15.37 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |