| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| 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 97113 - Cornelius, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 38 | 40 | 45 | 50 | 54 | 54 | 50 | 43 | 38 | 34 | 43 |
| Avg Max Temp (°F) | 46 | 50 | 56 | 61 | 68 | 74 | 81 | 82 | 77 | 65 | 52 | 46 | 63 |
| Avg Precip (In.) | 6.4 | 5.43 | 4.46 | 2.77 | 2.03 | 1.49 | .54 | .83 | 1.6 | 2.97 | 6.6 | 7.06 | 42.19 |