Ignacio, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 18 °C (high). Annual precipitation averages 331.7 Millimeters. Ignacio is located in USDA Plant Hardiness Zone 6a. 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 | -10.5 °C | 4.7 °C | 32 mm |
| February | -8.1 °C | 7.5 °C | 26.16 mm |
| March | -4.3 °C | 12.9 °C | 22.35 mm |
| April | -1.3 °C | 17.3 °C | 18.54 mm |
| May | 3.2 °C | 22.6 °C | 21.08 mm |
| June | 7.5 °C | 28.9 °C | 10.16 mm |
| July | 12.1 °C | 31.3 °C | 29.21 mm |
| August | 11.1 °C | 29.8 °C | 41.66 mm |
| September | 6.8 °C | 25.8 °C | 47.5 mm |
| October | 0.5 °C | 19 °C | 28.96 mm |
| November | -5.2 °C | 11.5 °C | 25.4 mm |
| December | -9.7 °C | 5.2 °C | 28.7 mm |
| Annual | 0.2 °C | 18 °C | 331.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |