Nappanee, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 59.3 °F (high). Annual precipitation averages 39.3 Inches. Nappanee 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 | 17.6 °F | 31.7 °F | 2.56 in. |
| February | 19.7 °F | 35.5 °F | 2.21 in. |
| March | 28.2 °F | 46.7 °F | 2.32 in. |
| April | 38.7 °F | 59.5 °F | 3.57 in. |
| May | 50.1 °F | 70.6 °F | 4.37 in. |
| June | 59.6 °F | 79.8 °F | 4.12 in. |
| July | 63.0 °F | 82.9 °F | 4.31 in. |
| August | 61.1 °F | 81.1 °F | 4.09 in. |
| September | 53.6 °F | 75.4 °F | 3.2 in. |
| October | 42.6 °F | 62.8 °F | 3.29 in. |
| November | 32.5 °F | 48.6 °F | 2.88 in. |
| December | 23.4 °F | 36.7 °F | 2.4 in. |
| Annual | 40.8 °F | 59.3 °F | 39.32 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 |