New Market, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 16.1 °C (high). Annual precipitation averages 927.6 Millimeters. New Market is located in USDA Plant Hardiness Zone 5b. 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 | -10.6 °C | -0.1 °C | 21.08 mm |
| February | -7.9 °C | 3.1 °C | 27.18 mm |
| March | -2.3 °C | 9.9 °C | 55.37 mm |
| April | 3.7 °C | 16.7 °C | 87.12 mm |
| May | 10.2 °C | 22.2 °C | 141.73 mm |
| June | 15.8 °C | 27.2 °C | 138.68 mm |
| July | 18.6 °C | 29.7 °C | 114.55 mm |
| August | 17.4 °C | 28.9 °C | 95.25 mm |
| September | 12.3 °C | 24.9 °C | 86.61 mm |
| October | 5.4 °C | 18.2 °C | 74.68 mm |
| November | -1.1 °C | 9.9 °C | 51.31 mm |
| December | -7.1 °C | 2.9 °C | 34.04 mm |
| Annual | 4.5 °C | 16.1 °C | 927.6 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |