| 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 8a: 10F to 15F | |
| 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: | 2e - Eastern Puget Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98029 - Issaquah, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 34 | 36 | 39 | 44 | 49 | 52 | 52 | 48 | 42 | 37 | 33 | 42 |
| Avg Max Temp (°F) | 44 | 48 | 53 | 58 | 64 | 69 | 75 | 75 | 70 | 59 | 49 | 44 | 59 |
| Avg Precip (In.) | 8.34 | 6.67 | 6.16 | 4.79 | 3.77 | 3.15 | 1.69 | 1.71 | 3.03 | 5.24 | 9.29 | 9.22 | 63.08 |