Lost Nation, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 14.7 °C (high). Annual precipitation averages 956.3 Millimeters. Lost Nation 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 | -11.3 °C | -2.1 °C | 34.29 mm |
| February | -9.3 °C | 0.4 °C | 40.39 mm |
| March | -3.1 °C | 7.7 °C | 59.18 mm |
| April | 2.9 °C | 15.4 °C | 94.74 mm |
| May | 9.6 °C | 21.8 °C | 114.3 mm |
| June | 15.2 °C | 26.8 °C | 127.76 mm |
| July | 17.1 °C | 28.5 °C | 107.95 mm |
| August | 15.8 °C | 27.6 °C | 107.7 mm |
| September | 10.9 °C | 24.2 °C | 94.74 mm |
| October | 4.4 °C | 17.1 °C | 75.69 mm |
| November | -2.1 °C | 8.4 °C | 54.86 mm |
| December | -7.7 °C | 1.1 °C | 44.7 mm |
| Annual | 3.5 °C | 14.7 °C | 956.3 mm |
| 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 : -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 |