| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 15r - Okanogan-Colville Xeric Valleys and Foothills |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 99141 - Kettle Falls, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 28 | 34 | 41 | 48 | 51 | 51 | 43 | 34 | 28 | 21 | 35 |
| Avg Max Temp (°F) | 31 | 38 | 48 | 58 | 67 | 74 | 82 | 83 | 73 | 57 | 39 | 32 | 57 |
| Avg Precip (In.) | 2.37 | 1.62 | 1.66 | 1.7 | 2.48 | 2.12 | 1.48 | 1.13 | .95 | 1.68 | 2.52 | 2.66 | 22.37 |