| 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 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 1g - Mid-Coastal Sedimentary |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97390 - Tidewater, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 37 | 38 | 39 | 43 | 47 | 51 | 52 | 49 | 45 | 40 | 36 | 43 |
| Avg Max Temp (°F) | 49 | 54 | 57 | 60 | 64 | 69 | 74 | 75 | 74 | 66 | 54 | 49 | 62 |
| Avg Precip (In.) | 15.47 | 12.92 | 11.84 | 7.67 | 4.89 | 2.83 | .89 | 1.18 | 2.87 | 6.15 | 15.48 | 16.89 | 99.1 |