| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°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 4b: -25F to -20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 13i - Malad and Cache Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 83263 - Preston, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 16 | 25 | 32 | 39 | 46 | 52 | 51 | 41 | 32 | 23 | 14 | 32 |
| Avg Max Temp (°F) | 31 | 37 | 47 | 58 | 67 | 78 | 87 | 86 | 75 | 63 | 45 | 33 | 59 |
| Avg Precip (In.) | 1.5 | 1.33 | 1.54 | 1.49 | 2.24 | 1.29 | .98 | 1.06 | 1.32 | 1.66 | 1.28 | 1.39 | 17.07 |