Antonito, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.5 °F (low) to 58.4 °F (high). Annual precipitation averages 9.1 Inches. Antonito is located in USDA Plant Hardiness Zone 5a. 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 | 4.6 °F | 34.9 °F | 0.3 in. |
| February | 10.7 °F | 39.9 °F | 0.28 in. |
| March | 19.0 °F | 50.0 °F | 0.55 in. |
| April | 25.7 °F | 57.5 °F | 0.62 in. |
| May | 34.3 °F | 66.6 °F | 0.78 in. |
| June | 41.7 °F | 76.9 °F | 0.46 in. |
| July | 47.7 °F | 80.0 °F | 1.43 in. |
| August | 46.0 °F | 77.7 °F | 1.7 in. |
| September | 38.8 °F | 72.2 °F | 1.21 in. |
| October | 27.5 °F | 61.5 °F | 0.81 in. |
| November | 16.3 °F | 48.0 °F | 0.54 in. |
| December | 6.1 °F | 36.0 °F | 0.43 in. |
| Annual | 26.5 °F | 58.4 °F | 9.11 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 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 | Dfb - Humid Continental Mild Summer, Wet All Year |