Simla, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.4 °F (low) to 62.7 °F (high). Annual precipitation averages 17.1 Inches. Simla is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.3 °F | 42.9 °F | 0.33 in. |
| February | 15.2 °F | 44.0 °F | 0.43 in. |
| March | 22.6 °F | 53.1 °F | 1.07 in. |
| April | 29.5 °F | 59.6 °F | 1.86 in. |
| May | 39.4 °F | 68.6 °F | 2.41 in. |
| June | 48.8 °F | 80.2 °F | 2.22 in. |
| July | 54.8 °F | 85.8 °F | 2.61 in. |
| August | 53.2 °F | 83.1 °F | 2.97 in. |
| September | 44.5 °F | 76.4 °F | 1.08 in. |
| October | 32.2 °F | 63.9 °F | 1.14 in. |
| November | 21.5 °F | 51.7 °F | 0.56 in. |
| December | 13.5 °F | 42.5 °F | 0.43 in. |
| Annual | 32.4 °F | 62.7 °F | 17.11 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |