| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 6b: -5°F to 0°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2b - Eastern Puget Riverine Lowlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98223 - Arlington, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 41 | 46 | 50 | 53 | 53 | 49 | 42 | 37 | 34 | 42 |
| Avg Max Temp (°F) | 46 | 49 | 53 | 58 | 64 | 69 | 74 | 75 | 69 | 60 | 50 | 45 | 59 |
| Avg Precip (In.) | 5.67 | 4.3 | 4.53 | 3.97 | 3.44 | 2.6 | 1.7 | 1.72 | 2.46 | 3.98 | 6.31 | 6.27 | 46.95 |