Plain City, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.9 °C (high). Annual precipitation averages 414.8 Millimeters. Plain City is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 2.1 °C | 45.47 mm |
| February | -4 °C | 5.2 °C | 36.58 mm |
| March | 0.6 °C | 11.4 °C | 41.66 mm |
| April | 3.9 °C | 15.8 °C | 45.72 mm |
| May | 8.7 °C | 21.3 °C | 53.85 mm |
| June | 12.9 °C | 27.5 °C | 23.88 mm |
| July | 17.5 °C | 32.9 °C | 11.68 mm |
| August | 16.5 °C | 31.9 °C | 16.51 mm |
| September | 11.2 °C | 25.8 °C | 29.46 mm |
| October | 4.7 °C | 17.6 °C | 40.64 mm |
| November | -0.9 °C | 9.1 °C | 29.21 mm |
| December | -5.3 °C | 2.6 °C | 40.13 mm |
| Annual | 5 °C | 16.9 °C | 414.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |