Fayette, Iowa has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 56.5 °F (high). Annual precipitation averages 38.6 Inches. 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 | 8.0 °F | 25.4 °F | 1.19 in. |
| February | 11.8 °F | 29.8 °F | 1.2 in. |
| March | 23.8 °F | 43.1 °F | 2.04 in. |
| April | 35.2 °F | 57.6 °F | 4.02 in. |
| May | 47.2 °F | 69.5 °F | 4.88 in. |
| June | 57.8 °F | 79.0 °F | 5.84 in. |
| July | 61.1 °F | 82.1 °F | 5.12 in. |
| August | 58.5 °F | 80.1 °F | 4.1 in. |
| September | 50.0 °F | 74.0 °F | 3.68 in. |
| October | 37.8 °F | 60.9 °F | 2.85 in. |
| November | 25.8 °F | 44.6 °F | 2.06 in. |
| December | 14.8 °F | 31.3 °F | 1.61 in. |
| Annual | 36 °F | 56.5 °F | 38.59 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |