| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95919 - Brownsville, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 38 | 41 | 47 | 52 | 57 | 55 | 52 | 45 | 37 | 33 | 44 |
| Avg Max Temp (°F) | 55 | 58 | 61 | 67 | 76 | 84 | 91 | 91 | 86 | 75 | 62 | 55 | 72 |
| Avg Precip (In.) | 11.44 | 10.33 | 9.14 | 4.35 | 2.33 | .67 | .14 | .18 | 1.08 | 3.11 | 7.61 | 9.36 | 59.75 |