| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | 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. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2a - Fraser Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98240 - Custer, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 37 | 40 | 45 | 50 | 53 | 53 | 48 | 42 | 37 | 33 | 42 |
| Avg Max Temp (°F) | 44 | 48 | 52 | 58 | 63 | 67 | 72 | 72 | 68 | 59 | 50 | 44 | 58 |
| Avg Precip (In.) | 6.43 | 4.93 | 4.5 | 3.57 | 2.88 | 2.47 | 1.84 | 1.76 | 2.46 | 4.65 | 7.14 | 6.86 | 49.49 |