| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| 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: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 84338 - Trenton, UT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 15 | 24 | 31 | 39 | 45 | 51 | 49 | 40 | 31 | 22 | 13 | 31 |
| Avg Max Temp (°F) | 31 | 37 | 48 | 58 | 68 | 79 | 88 | 87 | 76 | 63 | 45 | 33 | 60 |
| Avg Precip (In.) | 1.76 | 1.59 | 1.87 | 2.04 | 2.26 | 1.21 | .82 | .89 | 1.19 | 1.69 | 1.45 | 1.53 | 18.31 |