| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Jan. 21 - Jan. 31 |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 34a - Northern Humid Gulf Coastal Prairies |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77521 - Baytown, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 45 | 52 | 59 | 67 | 73 | 75 | 74 | 69 | 59 | 51 | 44 | 59 |
| Avg Max Temp (°F) | 62 | 65 | 72 | 78 | 84 | 89 | 92 | 92 | 88 | 81 | 71 | 64 | 78 |
| Avg Precip (In.) | 4.65 | 3.19 | 3.37 | 3.56 | 5.29 | 6.56 | 4.05 | 4.1 | 5.48 | 5.02 | 4.59 | 4.1 | 53.96 |