Farmersburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 13.7 °C (high). Annual precipitation averages 968.5 Millimeters. Farmersburg 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 | -12.9 °C | -3.3 °C | 29.97 mm |
| February | -10.9 °C | -0.8 °C | 30.73 mm |
| March | -4.2 °C | 6.4 °C | 52.32 mm |
| April | 2.1 °C | 14.3 °C | 100.84 mm |
| May | 8.6 °C | 20.8 °C | 121.92 mm |
| June | 14.4 °C | 26.1 °C | 148.08 mm |
| July | 16.4 °C | 27.9 °C | 117.09 mm |
| August | 15.1 °C | 26.9 °C | 104.9 mm |
| September | 10.4 °C | 23.3 °C | 97.03 mm |
| October | 3.7 °C | 16.1 °C | 72.9 mm |
| November | -2.9 °C | 7.1 °C | 53.09 mm |
| December | -8.9 °C | -0.2 °C | 39.62 mm |
| Annual | 2.6 °C | 13.7 °C | 968.49 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |