La Porte City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.8 °F (low) to 58.2 °F (high). Annual precipitation averages 37.7 Inches. La Porte 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 | 10.1 °F | 27.1 °F | 1.11 in. |
| February | 14.1 °F | 31.6 °F | 1.22 in. |
| March | 25.6 °F | 44.8 °F | 2.07 in. |
| April | 37.0 °F | 59.7 °F | 3.86 in. |
| May | 49.2 °F | 71.2 °F | 4.82 in. |
| June | 59.5 °F | 80.7 °F | 5.67 in. |
| July | 63.0 °F | 83.8 °F | 4.52 in. |
| August | 60.0 °F | 82.0 °F | 4.27 in. |
| September | 51.4 °F | 75.9 °F | 3.67 in. |
| October | 39.5 °F | 62.6 °F | 2.88 in. |
| November | 27.4 °F | 46.2 °F | 2.07 in. |
| December | 16.7 °F | 32.9 °F | 1.56 in. |
| Annual | 37.8 °F | 58.2 °F | 37.72 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |