Worthington, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.7 °C (high). Annual precipitation averages 1018.8 Millimeters. Worthington is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | 0.8 °C | 32.26 mm |
| February | -7.2 °C | 3.5 °C | 41.4 mm |
| March | -1.3 °C | 10.5 °C | 60.45 mm |
| April | 4.7 °C | 17.3 °C | 99.06 mm |
| May | 10.9 °C | 22.7 °C | 141.99 mm |
| June | 16.3 °C | 27.8 °C | 136.14 mm |
| July | 18.6 °C | 30.2 °C | 118.11 mm |
| August | 17.3 °C | 29.3 °C | 109.98 mm |
| September | 12.4 °C | 25.6 °C | 102.87 mm |
| October | 6 °C | 18.5 °C | 76.96 mm |
| November | -0.6 °C | 10.4 °C | 57.91 mm |
| December | -5.9 °C | 3.5 °C | 41.66 mm |
| Annual | 5.2 °C | 16.7 °C | 1018.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |