Arapahoe, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37 °F (low) to 66.6 °F (high). Annual precipitation averages 16.9 Inches. Arapahoe is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 44.3 °F | 0.28 in. |
| February | 18.3 °F | 46.5 °F | 0.39 in. |
| March | 25.8 °F | 56.4 °F | 0.76 in. |
| April | 33.8 °F | 64.6 °F | 1.49 in. |
| May | 44.7 °F | 74.0 °F | 2.27 in. |
| June | 55.4 °F | 85.7 °F | 2.56 in. |
| July | 60.9 °F | 91.1 °F | 3.13 in. |
| August | 58.9 °F | 88.3 °F | 2.75 in. |
| September | 50.3 °F | 81.2 °F | 1.27 in. |
| October | 36.7 °F | 67.9 °F | 1.25 in. |
| November | 25.3 °F | 54.3 °F | 0.38 in. |
| December | 17.1 °F | 44.4 °F | 0.39 in. |
| Annual | 37 °F | 66.6 °F | 16.92 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |