Romeo, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 25.6 °F (low) to 58.8 °F (high). Annual precipitation averages 7.8 Inches. Romeo is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °F | 34.5 °F | 0.21 in. |
| February | 9.3 °F | 40.2 °F | 0.21 in. |
| March | 18.5 °F | 50.8 °F | 0.44 in. |
| April | 25.2 °F | 58.4 °F | 0.53 in. |
| May | 34.1 °F | 67.3 °F | 0.66 in. |
| June | 41.3 °F | 77.3 °F | 0.39 in. |
| July | 47.4 °F | 80.2 °F | 1.24 in. |
| August | 45.5 °F | 78.1 °F | 1.51 in. |
| September | 38.2 °F | 72.9 °F | 1.11 in. |
| October | 26.4 °F | 62.2 °F | 0.72 in. |
| November | 14.8 °F | 48.5 °F | 0.47 in. |
| December | 3.8 °F | 35.7 °F | 0.34 in. |
| Annual | 25.6 °F | 58.8 °F | 7.83 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°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 |