Arapahoe, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.4 °F (low) to 60 °F (high). Annual precipitation averages 9.8 Inches. Arapahoe is located in USDA Plant Hardiness Zone 4b. 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 | 6.3 °F | 33.0 °F | 0.38 in. |
| February | 11.0 °F | 38.0 °F | 0.49 in. |
| March | 22.2 °F | 50.5 °F | 0.76 in. |
| April | 30.3 °F | 58.4 °F | 1.38 in. |
| May | 39.6 °F | 67.9 °F | 2.09 in. |
| June | 47.8 °F | 80.0 °F | 1.02 in. |
| July | 54.5 °F | 89.7 °F | 0.65 in. |
| August | 52.1 °F | 87.4 °F | 0.49 in. |
| September | 43.1 °F | 76.2 °F | 0.84 in. |
| October | 31.2 °F | 60.5 °F | 0.96 in. |
| November | 18.2 °F | 45.1 °F | 0.45 in. |
| December | 8.0 °F | 32.8 °F | 0.33 in. |
| Annual | 30.4 °F | 60 °F | 9.84 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |