| 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 | |
| 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: | 2e - Eastern Puget Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98075 - Sammamish, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 40 | 45 | 50 | 53 | 53 | 49 | 43 | 38 | 34 | 43 |
| Avg Max Temp (°F) | 45 | 49 | 54 | 59 | 65 | 70 | 75 | 76 | 71 | 60 | 50 | 45 | 60 |
| Avg Precip (In.) | 6.64 | 5.27 | 4.96 | 3.59 | 2.73 | 2.29 | 1.28 | 1.41 | 2.37 | 4.25 | 7.45 | 7.35 | 49.59 |