Worthington, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.9 °C (high). Annual precipitation averages 1206.2 Millimeters. Worthington is located in USDA Plant Hardiness Zone 6b. 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 | -6.1 °C | 3.1 °C | 86.36 mm |
| February | -4.6 °C | 5.8 °C | 67.82 mm |
| March | 0.3 °C | 11.8 °C | 90.93 mm |
| April | 6.1 °C | 18.3 °C | 127.76 mm |
| May | 11.9 °C | 23.7 °C | 135.38 mm |
| June | 16.8 °C | 28.3 °C | 129.03 mm |
| July | 18.4 °C | 30 °C | 114.81 mm |
| August | 17.3 °C | 29.7 °C | 81.03 mm |
| September | 13 °C | 26.4 °C | 93.98 mm |
| October | 6.6 °C | 20.1 °C | 93.98 mm |
| November | 1 °C | 12.1 °C | 99.82 mm |
| December | -3.5 °C | 5.7 °C | 85.34 mm |
| Annual | 6.4 °C | 17.9 °C | 1206.24 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |