Uniondale, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 15.9 °C (high). Annual precipitation averages 1031.5 Millimeters. Uniondale 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 | -7.9 °C | 0.6 °C | 67.31 mm |
| February | -6.7 °C | 2.6 °C | 55.12 mm |
| March | -2 °C | 8.7 °C | 69.34 mm |
| April | 3.9 °C | 16 °C | 100.58 mm |
| May | 10.1 °C | 22.2 °C | 116.08 mm |
| June | 15.6 °C | 27.2 °C | 117.6 mm |
| July | 17.3 °C | 29 °C | 111 mm |
| August | 16 °C | 28.1 °C | 101.6 mm |
| September | 11.8 °C | 25 °C | 77.72 mm |
| October | 5.7 °C | 18.1 °C | 73.91 mm |
| November | 0.1 °C | 10 °C | 77.98 mm |
| December | -4.7 °C | 3.3 °C | 63.25 mm |
| Annual | 4.9 °C | 15.9 °C | 1031.49 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 |