Newtown, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.4 °C (high). Annual precipitation averages 1027.7 Millimeters. Newtown is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.9 °C | 62.23 mm |
| February | -6.4 °C | 3.3 °C | 53.85 mm |
| March | -1.3 °C | 9.7 °C | 72.9 mm |
| April | 4.6 °C | 16.8 °C | 105.92 mm |
| May | 10.9 °C | 22.9 °C | 111.76 mm |
| June | 16.1 °C | 27.6 °C | 122.43 mm |
| July | 17.4 °C | 28.9 °C | 112.01 mm |
| August | 16.2 °C | 28.2 °C | 87.12 mm |
| September | 12 °C | 25.7 °C | 73.41 mm |
| October | 5.8 °C | 18.7 °C | 80.77 mm |
| November | 0.1 °C | 10.4 °C | 81.53 mm |
| December | -4.8 °C | 3.7 °C | 63.75 mm |
| Annual | 5.2 °C | 16.4 °C | 1027.68 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |