La Junta, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3 °C (low) to 21.1 °C (high). Annual precipitation averages 335.8 Millimeters. La Junta is located in USDA Plant Hardiness Zone 6a. 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 | -9.4 °C | 8.4 °C | 10.92 mm |
| February | -7.4 °C | 10.3 °C | 10.92 mm |
| March | -2.9 °C | 16.2 °C | 23.62 mm |
| April | 1.9 °C | 20.3 °C | 33.53 mm |
| May | 7.8 °C | 25.5 °C | 43.43 mm |
| June | 13.8 °C | 31.8 °C | 35.31 mm |
| July | 16.6 °C | 34.2 °C | 56.64 mm |
| August | 15.6 °C | 32.9 °C | 43.18 mm |
| September | 10.3 °C | 28.9 °C | 21.84 mm |
| October | 2.4 °C | 21.8 °C | 32.77 mm |
| November | -4.2 °C | 14.3 °C | 10.16 mm |
| December | -9.1 °C | 8.4 °C | 13.46 mm |
| Annual | 3 °C | 21.1 °C | 335.78 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |