Hydro, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 22.2 °C (high). Annual precipitation averages 784.6 Millimeters. Hydro is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 9.7 °C | 25.91 mm |
| February | -1.6 °C | 11.6 °C | 32.51 mm |
| March | 2.9 °C | 16.9 °C | 59.69 mm |
| April | 7.6 °C | 21.7 °C | 75.69 mm |
| May | 13.6 °C | 26.7 °C | 113.79 mm |
| June | 19.1 °C | 31.8 °C | 103.12 mm |
| July | 21.3 °C | 34.7 °C | 60.96 mm |
| August | 20.4 °C | 34.2 °C | 92.2 mm |
| September | 16.2 °C | 29.7 °C | 69.85 mm |
| October | 9.2 °C | 23.1 °C | 75.44 mm |
| November | 2.8 °C | 16.1 °C | 39.62 mm |
| December | -2.3 °C | 10.1 °C | 35.81 mm |
| Annual | 8.8 °C | 22.2 °C | 784.59 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |