Blanchard, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22.5 °C (high). Annual precipitation averages 896.6 Millimeters. Blanchard 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 | -2.7 °C | 10.2 °C | 33.78 mm |
| February | -0.8 °C | 12.5 °C | 39.12 mm |
| March | 4.1 °C | 17.6 °C | 66.8 mm |
| April | 8.6 °C | 22.4 °C | 90.93 mm |
| May | 14.3 °C | 26.6 °C | 132.59 mm |
| June | 19.4 °C | 31.1 °C | 106.93 mm |
| July | 21.6 °C | 34.4 °C | 80.77 mm |
| August | 21 °C | 34.3 °C | 75.44 mm |
| September | 16.7 °C | 29.7 °C | 87.88 mm |
| October | 9.9 °C | 23.7 °C | 81.03 mm |
| November | 3.7 °C | 16.8 °C | 51.82 mm |
| December | -1.2 °C | 10.9 °C | 49.53 mm |
| Annual | 9.6 °C | 22.5 °C | 896.62 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 |