Meridian, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.2 °F (low) to 72 °F (high). Annual precipitation averages 36.2 Inches. 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 | 25.5 °F | 49.5 °F | 1.26 in. |
| February | 28.8 °F | 53.0 °F | 1.54 in. |
| March | 37.5 °F | 62.8 °F | 2.67 in. |
| April | 46.6 °F | 71.9 °F | 3.88 in. |
| May | 57.1 °F | 79.7 °F | 4.9 in. |
| June | 66.8 °F | 88.1 °F | 4.82 in. |
| July | 71.0 °F | 93.9 °F | 3.25 in. |
| August | 69.5 °F | 93.5 °F | 3.36 in. |
| September | 61.2 °F | 85.7 °F | 3.37 in. |
| October | 48.8 °F | 73.9 °F | 3.36 in. |
| November | 37.4 °F | 61.7 °F | 2.09 in. |
| December | 27.8 °F | 50.5 °F | 1.71 in. |
| Annual | 48.2 °F | 72 °F | 36.21 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |