| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 10a - Channeled Scablands | |
| Current Drought Status: | Moderate Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98832 - Marlin, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 26 | 30 | 35 | 42 | 48 | 53 | 52 | 44 | 34 | 28 | 22 | 36 |
| Avg Max Temp (°F) | 35 | 43 | 53 | 63 | 72 | 79 | 87 | 87 | 78 | 63 | 45 | 35 | 62 |
| Avg Precip (In.) | 1.14 | .9 | .88 | .68 | .87 | .76 | .46 | .39 | .49 | .75 | 1.25 | 1.38 | 9.93 |