Garden City, 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 14.2 °C (high). Annual precipitation averages 924.1 Millimeters. Garden City 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 | -12.4 °C | -3 °C | 22.61 mm |
| February | -10.2 °C | -0.4 °C | 25.65 mm |
| March | -3.7 °C | 6.8 °C | 51.31 mm |
| April | 2.4 °C | 14.8 °C | 94.74 mm |
| May | 9.6 °C | 21.3 °C | 125.48 mm |
| June | 15.4 °C | 26.8 °C | 146.3 mm |
| July | 17.2 °C | 28.3 °C | 111.76 mm |
| August | 15.8 °C | 27.2 °C | 113.54 mm |
| September | 10.7 °C | 24 °C | 86.11 mm |
| October | 3.9 °C | 16.7 °C | 65.79 mm |
| November | -2.9 °C | 7.6 °C | 46.48 mm |
| December | -8.9 °C | 0.1 °C | 34.29 mm |
| Annual | 3.1 °C | 14.2 °C | 924.06 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |