| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 3a: -40F to -35F | |
| Average First Frost Date: | Sep.1 - Sep. 10 | |
| Average Last Frost Date: | Jun. 11 - Jun. 20 | |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall | |
| Ecoregion: | 17j - Yellowstone Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 83429 - Island Park, ID | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 6 | 13 | 23 | 32 | 38 | 42 | 41 | 33 | 25 | 14 | 4 | 23 |
| Avg Max Temp (°F) | 26 | 32 | 39 | 48 | 59 | 68 | 78 | 78 | 68 | 54 | 36 | 27 | 51 |
| Avg Precip (In.) | 3.7 | 3.18 | 2.87 | 2.34 | 2.69 | 2.37 | 1.55 | 1.6 | 1.68 | 1.75 | 2.79 | 3.68 | 30.19 |