| 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 4a: -30F to -25F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12e - Upper Snake River Plain |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 83274 - Shelley, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 25 | 31 | 39 | 46 | 51 | 49 | 40 | 31 | 23 | 13 | 31 |
| Avg Max Temp (°F) | 29 | 36 | 47 | 58 | 67 | 77 | 86 | 85 | 74 | 61 | 43 | 31 | 58 |
| Avg Precip (In.) | 1.03 | .88 | 1.09 | 1.05 | 1.67 | 1.06 | .66 | .72 | .79 | .97 | 1 | .97 | 11.89 |