Hornick, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 15.9 °C (high). Annual precipitation averages 788.2 Millimeters. Hornick is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -1.1 °C | 16.76 mm |
| February | -9.6 °C | 1.7 °C | 21.59 mm |
| March | -3.6 °C | 9.1 °C | 40.13 mm |
| April | 2.4 °C | 16.7 °C | 79.76 mm |
| May | 9.3 °C | 22.7 °C | 114.3 mm |
| June | 15.3 °C | 28.2 °C | 120.65 mm |
| July | 17.4 °C | 30 °C | 93.47 mm |
| August | 16 °C | 28.8 °C | 108.71 mm |
| September | 10.9 °C | 25.4 °C | 73.66 mm |
| October | 3.6 °C | 18.3 °C | 55.37 mm |
| November | -3.5 °C | 9.1 °C | 37.08 mm |
| December | -9.2 °C | 1.5 °C | 26.67 mm |
| Annual | 3.1 °C | 15.9 °C | 788.15 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |