| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 36b - Central Mountain Ranges |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 71968 - Royal, AR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 31 | 39 | 47 | 56 | 64 | 68 | 66 | 60 | 48 | 38 | 31 | 48 |
| Avg Max Temp (°F) | 50 | 57 | 65 | 74 | 80 | 88 | 93 | 92 | 85 | 75 | 62 | 53 | 73 |
| Avg Precip (In.) | 3.66 | 3.83 | 5.24 | 5.33 | 5.84 | 4.75 | 4.29 | 2.94 | 3.99 | 4.86 | 6.42 | 5.21 | 56.37 |