Hooper, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -4.1 °C (low) to 14.9 °C (high). Annual precipitation averages 197.4 Millimeters. Hooper 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.3 °C | 0.6 °C | 8.38 mm |
| February | -13.6 °C | 4.2 °C | 6.86 mm |
| March | -8.1 °C | 10.4 °C | 13.97 mm |
| April | -4.2 °C | 14.7 °C | 16.51 mm |
| May | 1 °C | 19.7 °C | 17.78 mm |
| June | 4.9 °C | 25.3 °C | 12.19 mm |
| July | 8.1 °C | 26.9 °C | 30.99 mm |
| August | 6.9 °C | 26.1 °C | 30.73 mm |
| September | 2.8 °C | 23.1 °C | 24.38 mm |
| October | -3.7 °C | 16.8 °C | 17.02 mm |
| November | -10.2 °C | 9.1 °C | 10.16 mm |
| December | -16.3 °C | 1.6 °C | 8.38 mm |
| Annual | -4.1 °C | 14.9 °C | 197.35 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| 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 |