| 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 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| 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 84335 - Smithfield, UT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 17 | 26 | 33 | 40 | 47 | 53 | 52 | 43 | 33 | 24 | 15 | 33 |
| Avg Max Temp (°F) | 32 | 38 | 48 | 58 | 69 | 80 | 89 | 88 | 77 | 63 | 45 | 33 | 60 |
| Avg Precip (In.) | 2.44 | 1.53 | 1.76 | 2.43 | 2.3 | 1.21 | .85 | .99 | .93 | 1.16 | 1.41 | 1.86 | 18.87 |