| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F 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: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 3c - Prairie Terraces |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97327 - Brownsville, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 39 | 44 | 48 | 52 | 52 | 48 | 42 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 47 | 51 | 56 | 60 | 67 | 72 | 80 | 81 | 76 | 64 | 52 | 46 | 63 |
| Avg Precip (In.) | 6.54 | 5.54 | 4.64 | 3.23 | 2.61 | 1.8 | .55 | .87 | 1.33 | 3.96 | 6.02 | 6.84 | 43.91 |