Blanca, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.8 °C (low) to 15.1 °C (high). Annual precipitation averages 247.4 Millimeters. Blanca is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | 1.6 °C | 8.89 mm |
| February | -11.7 °C | 4.7 °C | 8.64 mm |
| March | -6.7 °C | 10.4 °C | 18.03 mm |
| April | -3.1 °C | 14.5 °C | 19.3 mm |
| May | 1.8 °C | 19.6 °C | 27.43 mm |
| June | 6.4 °C | 25.5 °C | 19.05 mm |
| July | 9.3 °C | 27.5 °C | 39.88 mm |
| August | 8.2 °C | 26.2 °C | 36.32 mm |
| September | 4.1 °C | 23 °C | 28.19 mm |
| October | -2.3 °C | 16.7 °C | 20.32 mm |
| November | -9.1 °C | 8.9 °C | 10.92 mm |
| December | -14.8 °C | 2.2 °C | 10.41 mm |
| Annual | -2.8 °C | 15.1 °C | 247.38 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |