Fayette, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13.6 °C (high). Annual precipitation averages 980.2 Millimeters. Fayette is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.3 °C | -3.7 °C | 30.23 mm |
| February | -11.2 °C | -1.2 °C | 30.48 mm |
| March | -4.6 °C | 6.2 °C | 51.82 mm |
| April | 1.8 °C | 14.2 °C | 102.11 mm |
| May | 8.4 °C | 20.8 °C | 123.95 mm |
| June | 14.3 °C | 26.1 °C | 148.34 mm |
| July | 16.2 °C | 27.8 °C | 130.05 mm |
| August | 14.7 °C | 26.7 °C | 104.14 mm |
| September | 10 °C | 23.3 °C | 93.47 mm |
| October | 3.2 °C | 16.1 °C | 72.39 mm |
| November | -3.4 °C | 7 °C | 52.32 mm |
| December | -9.6 °C | -0.4 °C | 40.89 mm |
| Annual | 2.2 °C | 13.6 °C | 980.19 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |