New Market, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 61 °F (high). Annual precipitation averages 36.5 Inches. 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 | 13.0 °F | 31.9 °F | 0.83 in. |
| February | 17.8 °F | 37.5 °F | 1.07 in. |
| March | 27.8 °F | 49.9 °F | 2.18 in. |
| April | 38.6 °F | 62.1 °F | 3.43 in. |
| May | 50.4 °F | 71.9 °F | 5.58 in. |
| June | 60.4 °F | 81.0 °F | 5.46 in. |
| July | 65.4 °F | 85.5 °F | 4.51 in. |
| August | 63.3 °F | 84.0 °F | 3.75 in. |
| September | 54.1 °F | 76.9 °F | 3.41 in. |
| October | 41.8 °F | 64.7 °F | 2.94 in. |
| November | 30.0 °F | 49.8 °F | 2.02 in. |
| December | 19.3 °F | 37.3 °F | 1.34 in. |
| Annual | 40.2 °F | 61 °F | 36.52 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |