Galt, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.3 °C (low) to 13.6 °C (high). Annual precipitation averages 905.3 Millimeters. Galt 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 | -13.5 °C | -3.8 °C | 21.08 mm |
| February | -11.2 °C | -1.3 °C | 24.89 mm |
| March | -4.5 °C | 5.9 °C | 51.31 mm |
| April | 1.7 °C | 14.2 °C | 97.54 mm |
| May | 9.1 °C | 20.9 °C | 128.78 mm |
| June | 15 °C | 26.6 °C | 144.78 mm |
| July | 16.7 °C | 28 °C | 112.27 mm |
| August | 15 °C | 26.8 °C | 106.68 mm |
| September | 9.9 °C | 23.6 °C | 81.53 mm |
| October | 3.1 °C | 16.1 °C | 60.71 mm |
| November | -3.7 °C | 6.9 °C | 43.43 mm |
| December | -9.9 °C | -0.7 °C | 32.26 mm |
| Annual | 2.3 °C | 13.6 °C | 905.26 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |