| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 32a - Northern Blackland Prairie |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 75189 - Royse City, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 31 | 36 | 43 | 51 | 60 | 68 | 71 | 71 | 64 | 53 | 42 | 34 | 52 |
| Avg Max Temp (°F) | 53 | 58 | 67 | 74 | 81 | 89 | 94 | 94 | 87 | 78 | 65 | 56 | 75 |
| Avg Precip (In.) | 2.32 | 2.86 | 3.46 | 3.62 | 5.34 | 3.99 | 2.43 | 2.06 | 3.26 | 4.69 | 3.48 | 3.26 | 40.78 |