| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| 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 99344 - Othello, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 28 | 33 | 38 | 45 | 51 | 55 | 55 | 47 | 37 | 31 | 25 | 39 |
| Avg Max Temp (°F) | 37 | 45 | 55 | 63 | 71 | 78 | 86 | 86 | 77 | 63 | 47 | 37 | 62 |
| Avg Precip (In.) | .95 | .81 | .85 | .63 | .76 | .54 | .37 | .34 | .4 | .6 | 1.07 | 1.22 | 8.54 |