| 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: | 2g - Southern Puget Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98388 - Steilacoom, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 40 | 45 | 49 | 53 | 53 | 49 | 43 | 38 | 34 | 43 |
| Avg Max Temp (°F) | 46 | 50 | 54 | 59 | 66 | 70 | 76 | 76 | 71 | 61 | 51 | 46 | 60 |
| Avg Precip (In.) | 5.49 | 4.53 | 4.06 | 2.93 | 1.92 | 1.67 | .91 | 1.2 | 1.86 | 3.45 | 6.07 | 6.09 | 40.2 |