Tri-Lakes, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.5 °F (low) to 59.8 °F (high). Annual precipitation averages 38.7 Inches. Tri-Lakes 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 | 17.7 °F | 32.0 °F | 2.57 in. |
| February | 19.6 °F | 35.9 °F | 2.03 in. |
| March | 27.9 °F | 47.3 °F | 2.54 in. |
| April | 38.4 °F | 60.6 °F | 3.74 in. |
| May | 49.7 °F | 71.4 °F | 4.46 in. |
| June | 59.3 °F | 80.3 °F | 4.1 in. |
| July | 62.4 °F | 83.5 °F | 4.0 in. |
| August | 60.5 °F | 81.6 °F | 3.82 in. |
| September | 53.1 °F | 76.1 °F | 2.97 in. |
| October | 42.2 °F | 63.4 °F | 3.04 in. |
| November | 32.2 °F | 49.0 °F | 3.1 in. |
| December | 23.4 °F | 36.9 °F | 2.37 in. |
| Annual | 40.5 °F | 59.8 °F | 38.74 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |