Lafayette, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 62 °F (high). Annual precipitation averages 40.2 Inches. Lafayette 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 | 18.3 °F | 34.1 °F | 2.62 in. |
| February | 21.1 °F | 38.2 °F | 2.13 in. |
| March | 30.3 °F | 49.8 °F | 2.87 in. |
| April | 41.0 °F | 63.0 °F | 3.91 in. |
| May | 52.1 °F | 73.9 °F | 4.39 in. |
| June | 61.0 °F | 82.1 °F | 4.73 in. |
| July | 64.0 °F | 84.4 °F | 4.32 in. |
| August | 61.8 °F | 83.4 °F | 3.34 in. |
| September | 54.4 °F | 78.6 °F | 3.04 in. |
| October | 43.3 °F | 66.2 °F | 3.0 in. |
| November | 33.1 °F | 51.1 °F | 3.21 in. |
| December | 24.3 °F | 39.1 °F | 2.61 in. |
| Annual | 42.1 °F | 62 °F | 40.17 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |