| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10e - Pleistocene Lake Basins |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98837 - Moses Lake, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 27 | 32 | 38 | 44 | 51 | 56 | 55 | 47 | 36 | 30 | 24 | 38 |
| Avg Max Temp (°F) | 35 | 44 | 54 | 63 | 71 | 79 | 86 | 86 | 77 | 63 | 46 | 37 | 62 |
| Avg Precip (In.) | .95 | .67 | .63 | .5 | .74 | .66 | .39 | .38 | .43 | .71 | .99 | 1.04 | 8.08 |