Greeley, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1 °C (low) to 17.7 °C (high). Annual precipitation averages 351.8 Millimeters. Greeley is located in USDA Plant Hardiness Zone 5a. 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 | -10.8 °C | 4.7 °C | 9.4 mm |
| February | -9.2 °C | 6.4 °C | 10.16 mm |
| March | -4.2 °C | 12.7 °C | 21.84 mm |
| April | 0.1 °C | 16.6 °C | 43.94 mm |
| May | 6 °C | 21.5 °C | 65.02 mm |
| June | 11.3 °C | 28.2 °C | 43.94 mm |
| July | 14.1 °C | 31.5 °C | 35.31 mm |
| August | 12.6 °C | 30.3 °C | 38.1 mm |
| September | 7.6 °C | 26.1 °C | 29.72 mm |
| October | 0.6 °C | 18.4 °C | 27.94 mm |
| November | -5.7 °C | 10.7 °C | 15.75 mm |
| December | -10.7 °C | 4.7 °C | 10.67 mm |
| Annual | 1 °C | 17.7 °C | 351.79 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |