| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | Nov. 11 - Nov. 20 | |
| Average Last Frost Date: | Mar. 11 - Mar. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 32c - Floodplains and Low Terraces | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77880 - Washington, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 42 | 50 | 56 | 64 | 71 | 72 | 72 | 67 | 57 | 48 | 41 | 57 |
| Avg Max Temp (°F) | 60 | 65 | 72 | 79 | 86 | 92 | 96 | 96 | 90 | 82 | 71 | 63 | 79 |
| Avg Precip (In.) | 3.55 | 2.78 | 3.14 | 3.09 | 4.54 | 4.33 | 2.19 | 2.86 | 4.15 | 4.34 | 3.73 | 3.32 | 42.02 |