Obion, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 20.8 °C (high). Annual precipitation averages 1354.8 Millimeters. Obion 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 | 7.5 °C | 100.84 mm |
| February | -0.6 °C | 10.1 °C | 113.28 mm |
| March | 3.8 °C | 15.4 °C | 129.54 mm |
| April | 8.9 °C | 21.3 °C | 134.37 mm |
| May | 14.7 °C | 26.2 °C | 143.51 mm |
| June | 19.2 °C | 30.4 °C | 112.27 mm |
| July | 21 °C | 32.1 °C | 102.87 mm |
| August | 19.7 °C | 31.6 °C | 80.01 mm |
| September | 15.4 °C | 28.4 °C | 93.47 mm |
| October | 8.9 °C | 22.6 °C | 100.58 mm |
| November | 3.4 °C | 15.2 °C | 113.54 mm |
| December | -0.4 °C | 9.3 °C | 130.56 mm |
| Annual | 9.3 °C | 20.8 °C | 1354.84 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |