Lynn, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 60.2 °F (high). Annual precipitation averages 42.2 Inches. Lynn 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 | 18.0 °F | 33.6 °F | 2.93 in. |
| February | 20.3 °F | 37.4 °F | 2.29 in. |
| March | 29.4 °F | 48.0 °F | 3.3 in. |
| April | 39.7 °F | 60.9 °F | 4.26 in. |
| May | 50.9 °F | 71.2 °F | 4.54 in. |
| June | 60.2 °F | 79.7 °F | 4.79 in. |
| July | 62.1 °F | 82.5 °F | 4.19 in. |
| August | 60.4 °F | 81.3 °F | 3.44 in. |
| September | 53.3 °F | 76.0 °F | 3.14 in. |
| October | 42.6 °F | 63.7 °F | 3.09 in. |
| November | 32.1 °F | 50.1 °F | 3.28 in. |
| December | 23.3 °F | 38.1 °F | 2.9 in. |
| Annual | 41 °F | 60.2 °F | 42.15 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 |