Lynn, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 21.3 °C (high). Annual precipitation averages 1288 Millimeters. Lynn is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 8.2 °C | 98.3 mm |
| February | -0.5 °C | 10.9 °C | 101.09 mm |
| March | 3.9 °C | 16.1 °C | 117.86 mm |
| April | 9.1 °C | 21.7 °C | 135.13 mm |
| May | 14.7 °C | 26.3 °C | 132.84 mm |
| June | 19.3 °C | 30.9 °C | 90.68 mm |
| July | 21.3 °C | 32.7 °C | 94.23 mm |
| August | 20.1 °C | 32.2 °C | 94.74 mm |
| September | 15.7 °C | 28.7 °C | 88.65 mm |
| October | 9.1 °C | 22.9 °C | 100.58 mm |
| November | 3.5 °C | 15.6 °C | 119.13 mm |
| December | -0.6 °C | 9.6 °C | 114.81 mm |
| Annual | 9.5 °C | 21.3 °C | 1288.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |