Winslow, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 18.9 °C (high). Annual precipitation averages 1254 Millimeters. Winslow 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 | -4.9 °C | 4.4 °C | 90.17 mm |
| February | -3.5 °C | 7.1 °C | 76.71 mm |
| March | 1.1 °C | 12.8 °C | 109.22 mm |
| April | 6.8 °C | 19.6 °C | 131.57 mm |
| May | 12.8 °C | 24.7 °C | 142.49 mm |
| June | 17.6 °C | 29.2 °C | 123.19 mm |
| July | 19.2 °C | 30.9 °C | 112.27 mm |
| August | 18.1 °C | 30.4 °C | 80.01 mm |
| September | 13.8 °C | 27.3 °C | 97.28 mm |
| October | 7.4 °C | 20.9 °C | 89.92 mm |
| November | 1.7 °C | 13 °C | 105.16 mm |
| December | -2.5 °C | 6.9 °C | 96.01 mm |
| Annual | 7.3 °C | 18.9 °C | 1254 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |