Greenfield, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 16.6 °C (high). Annual precipitation averages 1164.8 Millimeters. Greenfield 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 | -6.9 °C | 1.8 °C | 81.03 mm |
| February | -5.5 °C | 4.1 °C | 63.5 mm |
| March | -0.8 °C | 9.9 °C | 89.66 mm |
| April | 5.2 °C | 17 °C | 117.6 mm |
| May | 11.4 °C | 22.6 °C | 131.06 mm |
| June | 16.4 °C | 27.3 °C | 137.16 mm |
| July | 17.9 °C | 28.9 °C | 114.55 mm |
| August | 16.9 °C | 28.4 °C | 87.63 mm |
| September | 12.7 °C | 25.3 °C | 87.38 mm |
| October | 6.5 °C | 18.4 °C | 83.57 mm |
| November | 0.7 °C | 10.7 °C | 90.17 mm |
| December | -4 °C | 4.2 °C | 81.53 mm |
| Annual | 5.9 °C | 16.6 °C | 1164.84 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |