New Hampton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.2 °C (low) to 13.2 °C (high). Annual precipitation averages 985.3 Millimeters. New Hampton 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 | -13.5 °C | -4.1 °C | 28.19 mm |
| February | -11.3 °C | -1.8 °C | 32 mm |
| March | -4.7 °C | 5.6 °C | 53.34 mm |
| April | 1.8 °C | 13.8 °C | 104.9 mm |
| May | 8.6 °C | 20.5 °C | 123.44 mm |
| June | 14.4 °C | 25.9 °C | 161.04 mm |
| July | 16.3 °C | 27.5 °C | 120.9 mm |
| August | 14.8 °C | 26.4 °C | 109.47 mm |
| September | 10.2 °C | 23.1 °C | 94.74 mm |
| October | 3.3 °C | 15.6 °C | 67.56 mm |
| November | -3.5 °C | 6.5 °C | 46.74 mm |
| December | -9.8 °C | -1 °C | 42.93 mm |
| Annual | 2.2 °C | 13.2 °C | 985.25 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |