Yorktown, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.2 °C (high). Annual precipitation averages 1087.9 Millimeters. Yorktown 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 | -7.5 °C | 1.1 °C | 73.66 mm |
| February | -6.1 °C | 3.3 °C | 61.21 mm |
| March | -1.2 °C | 9.3 °C | 84.84 mm |
| April | 4.6 °C | 16.5 °C | 106.43 mm |
| May | 10.8 °C | 22.5 °C | 113.79 mm |
| June | 16 °C | 27.3 °C | 126.24 mm |
| July | 17.4 °C | 28.8 °C | 109.73 mm |
| August | 16.3 °C | 28.1 °C | 89.66 mm |
| September | 12.1 °C | 25.2 °C | 81.28 mm |
| October | 6.1 °C | 18.2 °C | 79.25 mm |
| November | 0.5 °C | 10.4 °C | 85.85 mm |
| December | -4.3 °C | 3.8 °C | 75.95 mm |
| Annual | 5.4 °C | 16.2 °C | 1087.89 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |