| 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 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: | 3b - Willamette River and Tributaries Gallery Forest | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 97455 - Pleasant Hill, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 36 | 38 | 41 | 45 | 49 | 53 | 53 | 50 | 44 | 39 | 35 | 43 |
| Avg Max Temp (°F) | 48 | 52 | 56 | 61 | 67 | 73 | 80 | 81 | 76 | 65 | 53 | 47 | 63 |
| Avg Precip (In.) | 6.97 | 5.52 | 5.22 | 3.45 | 3.1 | 1.74 | .48 | .76 | 1.2 | 4.07 | 6.76 | 7.58 | 46.85 |