| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 3b - Willamette River and Tributaries Gallery Forest |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97477 - Springfield, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 36 | 38 | 41 | 45 | 49 | 53 | 53 | 49 | 44 | 39 | 35 | 43 |
| Avg Max Temp (°F) | 47 | 52 | 56 | 61 | 67 | 73 | 81 | 82 | 76 | 65 | 53 | 47 | 63 |
| Avg Precip (In.) | 5.79 | 5.07 | 4.61 | 3.51 | 2.77 | 1.84 | .47 | .63 | 1.29 | 3.31 | 5.6 | 6.96 | 41.83 |