Orestes, 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 16.3 °C (high). Annual precipitation averages 1095 Millimeters. Orestes 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 | -7.5 °C | 1.1 °C | 75.18 mm |
| February | -6.2 °C | 3.3 °C | 61.47 mm |
| March | -1.2 °C | 9.3 °C | 85.6 mm |
| April | 4.5 °C | 16.6 °C | 108.46 mm |
| May | 10.7 °C | 22.6 °C | 109.98 mm |
| June | 15.9 °C | 27.2 °C | 128.52 mm |
| July | 17.4 °C | 28.9 °C | 114.81 mm |
| August | 16.3 °C | 28.2 °C | 94.49 mm |
| September | 12.2 °C | 25.3 °C | 81.03 mm |
| October | 6.1 °C | 18.3 °C | 76.45 mm |
| November | 0.5 °C | 10.4 °C | 86.11 mm |
| December | -4.3 °C | 3.8 °C | 72.9 mm |
| Annual | 5.4 °C | 16.3 °C | 1095 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |