Newtonia, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19.8 °C (high). Annual precipitation averages 1208.5 Millimeters. Newtonia is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 6.8 °C | 61.72 mm |
| February | -2.7 °C | 9.3 °C | 57.4 mm |
| March | 2.1 °C | 14.6 °C | 96.27 mm |
| April | 7.1 °C | 19.7 °C | 128.02 mm |
| May | 12.6 °C | 24 °C | 160.27 mm |
| June | 17.6 °C | 28.8 °C | 126.49 mm |
| July | 19.9 °C | 31.5 °C | 99.57 mm |
| August | 19 °C | 31.3 °C | 90.42 mm |
| September | 14.4 °C | 27.2 °C | 119.13 mm |
| October | 8 °C | 21.1 °C | 101.35 mm |
| November | 2.2 °C | 14.3 °C | 95 mm |
| December | -2.6 °C | 8.6 °C | 72.9 mm |
| Annual | 7.8 °C | 19.8 °C | 1208.54 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |