Greeley, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.2 °F (low) to 55.9 °F (high). Annual precipitation averages 39 Inches. Greeley is located in USDA Plant Hardiness Zone 4b. 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 | 7.2 °F | 25.0 °F | 1.22 in. |
| February | 11.1 °F | 29.4 °F | 1.3 in. |
| March | 23.1 °F | 42.7 °F | 2.14 in. |
| April | 34.4 °F | 57.0 °F | 3.96 in. |
| May | 46.4 °F | 68.7 °F | 4.81 in. |
| June | 57.3 °F | 78.8 °F | 5.88 in. |
| July | 60.3 °F | 81.4 °F | 4.85 in. |
| August | 57.8 °F | 79.3 °F | 4.16 in. |
| September | 49.1 °F | 73.5 °F | 3.76 in. |
| October | 36.8 °F | 60.3 °F | 3.03 in. |
| November | 25.0 °F | 44.2 °F | 2.25 in. |
| December | 14.3 °F | 30.9 °F | 1.66 in. |
| Annual | 35.2 °F | 55.9 °F | 39.02 in. |
| 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |