| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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 7a: 0°F to 5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 11 - Jun. 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 19g - Mountain Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 84710 - Alton, UT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 22 | 27 | 34 | 41 | 48 | 48 | 41 | 31 | 19 | 13 | 30 |
| Avg Max Temp (°F) | 40 | 43 | 48 | 56 | 62 | 76 | 79 | 80 | 73 | 59 | 46 | 41 | 59 |
| Avg Precip (In.) | 2.01 | 2.19 | 2.18 | 1.24 | 1.07 | .53 | 1.19 | 1.61 | 1.52 | 1.62 | 1.5 | 1.51 | 18.18 |