Oldenburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 63.3 °F (high). Annual precipitation averages 45.5 Inches. 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 | 21.3 °F | 37.8 °F | 3.44 in. |
| February | 23.5 °F | 41.8 °F | 2.81 in. |
| March | 31.6 °F | 51.9 °F | 3.8 in. |
| April | 42.1 °F | 64.0 °F | 4.73 in. |
| May | 52.5 °F | 73.8 °F | 4.96 in. |
| June | 61.2 °F | 81.6 °F | 4.75 in. |
| July | 64.4 °F | 84.6 °F | 4.13 in. |
| August | 62.6 °F | 84.1 °F | 3.27 in. |
| September | 54.8 °F | 78.2 °F | 3.19 in. |
| October | 43.6 °F | 66.6 °F | 3.23 in. |
| November | 33.5 °F | 53.2 °F | 3.5 in. |
| December | 26.1 °F | 41.7 °F | 3.65 in. |
| Annual | 43.1 °F | 63.3 °F | 45.46 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |