Loyal, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 22.3 °C (high). Annual precipitation averages 838.5 Millimeters. Loyal is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 9.3 °C | 25.91 mm |
| February | -2.4 °C | 11.4 °C | 35.31 mm |
| March | 2.3 °C | 16.8 °C | 60.96 mm |
| April | 6.9 °C | 21.8 °C | 86.11 mm |
| May | 13.2 °C | 26.9 °C | 116.84 mm |
| June | 18.9 °C | 32.3 °C | 113.54 mm |
| July | 21.4 °C | 35.3 °C | 78.23 mm |
| August | 20.5 °C | 34.6 °C | 89.41 mm |
| September | 16.1 °C | 30.3 °C | 71.63 mm |
| October | 9.1 °C | 23.3 °C | 77.22 mm |
| November | 2.2 °C | 15.9 °C | 44.96 mm |
| December | -2.9 °C | 9.9 °C | 38.35 mm |
| Annual | 8.4 °C | 22.3 °C | 838.47 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |