Ellington, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 20.2 °C (high). Annual precipitation averages 1223.8 Millimeters. Ellington is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 6.8 °C | 77.72 mm |
| February | -4 °C | 9.7 °C | 80.77 mm |
| March | 0.6 °C | 15.2 °C | 102.87 mm |
| April | 6 °C | 21.5 °C | 150.11 mm |
| May | 11.5 °C | 25.3 °C | 134.87 mm |
| June | 16.1 °C | 29.6 °C | 102.36 mm |
| July | 18.6 °C | 31.7 °C | 95.76 mm |
| August | 17.6 °C | 31.5 °C | 88.14 mm |
| September | 12.9 °C | 27.6 °C | 98.3 mm |
| October | 5.8 °C | 21.3 °C | 87.12 mm |
| November | 0.3 °C | 14.3 °C | 120.9 mm |
| December | -3.8 °C | 8.3 °C | 84.84 mm |
| Annual | 6.3 °C | 20.2 °C | 1223.76 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |