| 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 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 12i - Magic Valley |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 83350 - Rupert, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 27 | 33 | 40 | 47 | 52 | 50 | 41 | 33 | 24 | 16 | 33 |
| Avg Max Temp (°F) | 35 | 41 | 51 | 61 | 68 | 79 | 87 | 87 | 76 | 64 | 46 | 36 | 61 |
| Avg Precip (In.) | 1.1 | .8 | 1.05 | .87 | 1.26 | .92 | .38 | .37 | .63 | .69 | 1.03 | .96 | 10.07 |