Farley, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.5 °F (low) to 56 °F (high). Annual precipitation averages 39 Inches. Farley is located in USDA Plant Hardiness Zone 5a. 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 | 9.0 °F | 25.7 °F | 1.25 in. |
| February | 12.9 °F | 30.2 °F | 1.44 in. |
| March | 24.5 °F | 43.2 °F | 2.15 in. |
| April | 35.6 °F | 57.1 °F | 3.87 in. |
| May | 47.5 °F | 68.6 °F | 4.53 in. |
| June | 57.7 °F | 78.1 °F | 5.89 in. |
| July | 61.1 °F | 81.2 °F | 4.79 in. |
| August | 58.8 °F | 79.5 °F | 4.35 in. |
| September | 50.0 °F | 72.8 °F | 3.76 in. |
| October | 38.1 °F | 59.9 °F | 3.02 in. |
| November | 26.4 °F | 44.3 °F | 2.27 in. |
| December | 15.9 °F | 31.5 °F | 1.7 in. |
| Annual | 36.5 °F | 56 °F | 39.02 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |