Sterling, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.2 °F (low) to 65.5 °F (high). Annual precipitation averages 15.9 Inches. Sterling is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.6 °F | 42.4 °F | 0.3 in. |
| February | 16.9 °F | 45.0 °F | 0.42 in. |
| March | 25.1 °F | 55.7 °F | 0.79 in. |
| April | 32.6 °F | 63.1 °F | 1.61 in. |
| May | 43.3 °F | 72.2 °F | 2.59 in. |
| June | 53.6 °F | 84.7 °F | 2.36 in. |
| July | 60.0 °F | 91.4 °F | 2.6 in. |
| August | 56.8 °F | 88.9 °F | 2.02 in. |
| September | 47.5 °F | 80.5 °F | 1.22 in. |
| October | 34.1 °F | 66.9 °F | 1.12 in. |
| November | 23.1 °F | 53.1 °F | 0.46 in. |
| December | 14.5 °F | 41.9 °F | 0.41 in. |
| Annual | 35.2 °F | 65.5 °F | 15.9 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |