Merino, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.7 °C (low) to 18.5 °C (high). Annual precipitation averages 405.9 Millimeters. Merino is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | 5.7 °C | 7.62 mm |
| February | -8.5 °C | 7.2 °C | 10.16 mm |
| March | -3.8 °C | 13.2 °C | 19.81 mm |
| April | 0.4 °C | 17.2 °C | 41.15 mm |
| May | 6.3 °C | 22.2 °C | 67.56 mm |
| June | 11.9 °C | 29.1 °C | 58.42 mm |
| July | 15.4 °C | 32.8 °C | 66.04 mm |
| August | 13.7 °C | 31.4 °C | 53.34 mm |
| September | 8.6 °C | 26.8 °C | 32 mm |
| October | 1.1 °C | 19.3 °C | 28.45 mm |
| November | -5.1 °C | 11.6 °C | 11.68 mm |
| December | -9.8 °C | 5.4 °C | 9.65 mm |
| Annual | 1.7 °C | 18.5 °C | 405.88 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |