Oolitic, 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 18.4 °C (high). Annual precipitation averages 1240.8 Millimeters. Oolitic is located in USDA Plant Hardiness Zone 6b. 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 | -6.2 °C | 3.8 °C | 90.17 mm |
| February | -4.7 °C | 6.5 °C | 73.41 mm |
| March | -0.4 °C | 12.2 °C | 102.87 mm |
| April | 5.1 °C | 18.9 °C | 131.83 mm |
| May | 11.1 °C | 24.1 °C | 144.02 mm |
| June | 15.9 °C | 28.3 °C | 130.56 mm |
| July | 18 °C | 30.4 °C | 111 mm |
| August | 16.9 °C | 30 °C | 90.93 mm |
| September | 12.7 °C | 26.8 °C | 88.65 mm |
| October | 5.9 °C | 20.2 °C | 89.92 mm |
| November | 0.5 °C | 12.6 °C | 97.28 mm |
| December | -3.7 °C | 6.4 °C | 90.17 mm |
| Annual | 5.9 °C | 18.4 °C | 1240.81 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 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 |