Garvin, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.5 °C (high). Annual precipitation averages 1319.5 Millimeters. Garvin is located in USDA Plant Hardiness Zone 8a. 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 | -0.7 °C | 12.1 °C | 87.12 mm |
| February | 1.3 °C | 14.4 °C | 97.03 mm |
| March | 5.2 °C | 18.8 °C | 114.81 mm |
| April | 9.3 °C | 23.1 °C | 127 mm |
| May | 14.8 °C | 27.1 °C | 155.45 mm |
| June | 19.6 °C | 31.6 °C | 104.65 mm |
| July | 21.4 °C | 34.1 °C | 87.63 mm |
| August | 20.7 °C | 34.3 °C | 82.04 mm |
| September | 17.1 °C | 30.7 °C | 107.7 mm |
| October | 10.4 °C | 24.7 °C | 124.97 mm |
| November | 4.8 °C | 18.4 °C | 111.25 mm |
| December | 0.7 °C | 13.2 °C | 119.89 mm |
| Annual | 10.4 °C | 23.5 °C | 1319.54 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |