Highland, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 15.4 °C (high). Annual precipitation averages 1024.6 Millimeters. Highland 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 | -7.8 °C | 0.3 °C | 57.66 mm |
| February | -6.4 °C | 2.4 °C | 54.61 mm |
| March | -1.4 °C | 8.2 °C | 59.94 mm |
| April | 4.1 °C | 15.1 °C | 95.5 mm |
| May | 10.1 °C | 21 °C | 109.98 mm |
| June | 15.6 °C | 26.4 °C | 119.13 mm |
| July | 18.3 °C | 28.7 °C | 108.2 mm |
| August | 17.4 °C | 27.8 °C | 106.93 mm |
| September | 13.2 °C | 24.6 °C | 85.6 mm |
| October | 6.8 °C | 17.5 °C | 93.98 mm |
| November | 0.8 °C | 9.7 °C | 73.41 mm |
| December | -4.7 °C | 3.1 °C | 59.69 mm |
| Annual | 5.5 °C | 15.4 °C | 1024.63 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |