Meridian, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 22.2 °C (high). Annual precipitation averages 919.7 Millimeters. Meridian 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 9.7 °C | 32 mm |
| February | -1.8 °C | 11.7 °C | 39.12 mm |
| March | 3.1 °C | 17.1 °C | 67.82 mm |
| April | 8.1 °C | 22.2 °C | 98.55 mm |
| May | 13.9 °C | 26.5 °C | 124.46 mm |
| June | 19.3 °C | 31.2 °C | 122.43 mm |
| July | 21.7 °C | 34.4 °C | 82.55 mm |
| August | 20.8 °C | 34.2 °C | 85.34 mm |
| September | 16.2 °C | 29.8 °C | 85.6 mm |
| October | 9.3 °C | 23.3 °C | 85.34 mm |
| November | 3 °C | 16.5 °C | 53.09 mm |
| December | -2.3 °C | 10.3 °C | 43.43 mm |
| Annual | 9 °C | 22.2 °C | 919.73 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |