Oldenburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 17.4 °C (high). Annual precipitation averages 1154.7 Millimeters. Oldenburg 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 | -5.9 °C | 3.2 °C | 87.38 mm |
| February | -4.7 °C | 5.4 °C | 71.37 mm |
| March | -0.2 °C | 11.1 °C | 96.52 mm |
| April | 5.6 °C | 17.8 °C | 120.14 mm |
| May | 11.4 °C | 23.2 °C | 125.98 mm |
| June | 16.2 °C | 27.6 °C | 120.65 mm |
| July | 18 °C | 29.2 °C | 104.9 mm |
| August | 17 °C | 28.9 °C | 83.06 mm |
| September | 12.7 °C | 25.7 °C | 81.03 mm |
| October | 6.4 °C | 19.2 °C | 82.04 mm |
| November | 0.8 °C | 11.8 °C | 88.9 mm |
| December | -3.3 °C | 5.4 °C | 92.71 mm |
| Annual | 6.2 °C | 17.4 °C | 1154.68 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 |