| 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 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Cfb - Oceanic Climate | |
| Ecoregion: | 2e - Eastern Puget Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98010 - Black Diamond, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 35 | 38 | 43 | 48 | 51 | 51 | 47 | 41 | 36 | 32 | 41 |
| Avg Max Temp (°F) | 44 | 48 | 53 | 58 | 64 | 69 | 75 | 76 | 70 | 59 | 49 | 44 | 59 |
| Avg Precip (In.) | 6.63 | 5.5 | 5.06 | 4.12 | 3.27 | 2.86 | 1.55 | 1.63 | 2.58 | 4.29 | 7.68 | 7.11 | 52.27 |