American Fork, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 18 °C (high). Annual precipitation averages 370.3 Millimeters. American Fork is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 3.7 °C | 35.81 mm |
| February | -3.9 °C | 6.9 °C | 30.73 mm |
| March | 0.2 °C | 12.9 °C | 38.1 mm |
| April | 2.9 °C | 16.9 °C | 41.66 mm |
| May | 7.2 °C | 22.4 °C | 47.5 mm |
| June | 11.3 °C | 28.8 °C | 22.61 mm |
| July | 16.1 °C | 33.3 °C | 12.19 mm |
| August | 15.5 °C | 32.3 °C | 21.08 mm |
| September | 10.3 °C | 26.7 °C | 26.67 mm |
| October | 3.9 °C | 18.6 °C | 34.29 mm |
| November | -1.2 °C | 10.2 °C | 28.7 mm |
| December | -5.5 °C | 3.8 °C | 30.99 mm |
| Annual | 4.2 °C | 18 °C | 370.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |