Gerty, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 22.6 °C (high). Annual precipitation averages 1089.9 Millimeters. Gerty 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 | -2.2 °C | 10.7 °C | 53.85 mm |
| February | -0.2 °C | 12.9 °C | 56.39 mm |
| March | 4.5 °C | 17.7 °C | 85.85 mm |
| April | 9.1 °C | 22.4 °C | 108.97 mm |
| May | 14.6 °C | 26.2 °C | 144.27 mm |
| June | 19.5 °C | 30.8 °C | 120.4 mm |
| July | 21.5 °C | 33.8 °C | 93.47 mm |
| August | 20.8 °C | 34.1 °C | 75.69 mm |
| September | 16.5 °C | 30 °C | 102.62 mm |
| October | 10.1 °C | 23.8 °C | 101.35 mm |
| November | 4.2 °C | 17.4 °C | 74.68 mm |
| December | -0.7 °C | 11.7 °C | 72.39 mm |
| Annual | 9.8 °C | 22.6 °C | 1089.93 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |