Geronimo, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 23.8 °C (high). Annual precipitation averages 785.6 Millimeters. Geronimo 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 | -2.3 °C | 11.6 °C | 31.75 mm |
| February | -0.3 °C | 13.8 °C | 39.37 mm |
| March | 4.5 °C | 18.8 °C | 61.21 mm |
| April | 8.9 °C | 23.3 °C | 76.71 mm |
| May | 14.8 °C | 27.9 °C | 108.97 mm |
| June | 19.9 °C | 32.8 °C | 92.46 mm |
| July | 22 °C | 35.7 °C | 58.93 mm |
| August | 21.5 °C | 35.6 °C | 66.8 mm |
| September | 17.2 °C | 30.9 °C | 74.93 mm |
| October | 10.3 °C | 24.7 °C | 81.03 mm |
| November | 3.9 °C | 17.8 °C | 48.77 mm |
| December | -1.3 °C | 12.2 °C | 44.7 mm |
| Annual | 9.9 °C | 23.8 °C | 785.63 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 |