| 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: | October 21 - 31 | |
| Average Last Frost Date: | April 1 - 10 | |
| 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 98074 - 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 | 50 | 54 | 59 | 65 | 70 | 76 | 76 | 71 | 60 | 50 | 45 | 60 |
| Avg Precip (In.) | 6.66 | 5.25 | 5.03 | 3.51 | 2.67 | 2.28 | 1.28 | 1.44 | 2.45 | 4.38 | 7.42 | 7.49 | 49.87 |