| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°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: | Nov. 11 - Nov. 20 |
| 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 97478 - Springfield, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 37 | 39 | 41 | 45 | 49 | 53 | 53 | 50 | 44 | 39 | 35 | 43 |
| Avg Max Temp (°F) | 47 | 52 | 56 | 60 | 66 | 72 | 80 | 81 | 76 | 65 | 53 | 47 | 63 |
| Avg Precip (In.) | 6.79 | 5.58 | 4.92 | 3.59 | 3.15 | 2.04 | .54 | .81 | 1.31 | 4.01 | 6.28 | 7.46 | 46.48 |