Olathe, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.8 °F (low) to 64.9 °F (high). Annual precipitation averages 8.5 Inches. Olathe is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.4 °F | 39.5 °F | 0.51 in. |
| February | 21.5 °F | 46.1 °F | 0.52 in. |
| March | 27.9 °F | 56.7 °F | 0.59 in. |
| April | 33.9 °F | 63.8 °F | 0.73 in. |
| May | 42.7 °F | 73.3 °F | 0.7 in. |
| June | 51.0 °F | 85.5 °F | 0.39 in. |
| July | 57.2 °F | 89.6 °F | 0.97 in. |
| August | 55.0 °F | 86.5 °F | 0.89 in. |
| September | 46.7 °F | 79.3 °F | 1.12 in. |
| October | 35.3 °F | 66.5 °F | 1.0 in. |
| November | 24.9 °F | 52.3 °F | 0.63 in. |
| December | 16.5 °F | 39.5 °F | 0.47 in. |
| Annual | 35.8 °F | 64.9 °F | 8.52 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |