Cleghorn, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 57.1 °F (high). Annual precipitation averages 31 Inches. Cleghorn 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 | 8.4 °F | 26.2 °F | 0.71 in. |
| February | 12.6 °F | 30.7 °F | 0.87 in. |
| March | 24.2 °F | 43.9 °F | 1.71 in. |
| April | 35.3 °F | 58.1 °F | 3.28 in. |
| May | 48.3 °F | 70.1 °F | 4.18 in. |
| June | 59.2 °F | 80.0 °F | 4.87 in. |
| July | 62.7 °F | 83.0 °F | 3.5 in. |
| August | 60.2 °F | 80.6 °F | 3.97 in. |
| September | 51.2 °F | 74.7 °F | 3.18 in. |
| October | 38.6 °F | 61.3 °F | 2.31 in. |
| November | 25.3 °F | 44.8 °F | 1.41 in. |
| December | 14.4 °F | 31.3 °F | 0.96 in. |
| Annual | 36.7 °F | 57.1 °F | 30.95 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |