Galt, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.1 °F (low) to 56.5 °F (high). Annual precipitation averages 35.6 Inches. 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 | 7.7 °F | 25.1 °F | 0.83 in. |
| February | 11.8 °F | 29.7 °F | 0.98 in. |
| March | 23.9 °F | 42.6 °F | 2.02 in. |
| April | 35.1 °F | 57.6 °F | 3.84 in. |
| May | 48.3 °F | 69.6 °F | 5.07 in. |
| June | 59.0 °F | 79.9 °F | 5.7 in. |
| July | 62.0 °F | 82.4 °F | 4.42 in. |
| August | 59.0 °F | 80.3 °F | 4.2 in. |
| September | 49.9 °F | 74.5 °F | 3.21 in. |
| October | 37.5 °F | 61.0 °F | 2.39 in. |
| November | 25.3 °F | 44.5 °F | 1.71 in. |
| December | 14.1 °F | 30.8 °F | 1.27 in. |
| Annual | 36.1 °F | 56.5 °F | 35.64 in. |
| 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 : -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 |