Olathe, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.1 °C (low) to 18.3 °C (high). Annual precipitation averages 216.4 Millimeters. 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 | -8.7 °C | 4.2 °C | 12.95 mm |
| February | -5.8 °C | 7.8 °C | 13.21 mm |
| March | -2.3 °C | 13.7 °C | 14.99 mm |
| April | 1.1 °C | 17.7 °C | 18.54 mm |
| May | 5.9 °C | 22.9 °C | 17.78 mm |
| June | 10.6 °C | 29.7 °C | 9.91 mm |
| July | 14 °C | 32 °C | 24.64 mm |
| August | 12.8 °C | 30.3 °C | 22.61 mm |
| September | 8.2 °C | 26.3 °C | 28.45 mm |
| October | 1.8 °C | 19.2 °C | 25.4 mm |
| November | -3.9 °C | 11.3 °C | 16 mm |
| December | -8.6 °C | 4.2 °C | 11.94 mm |
| Annual | 2.1 °C | 18.3 °C | 216.42 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |