Sanborn, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2 °C (low) to 13.3 °C (high). Annual precipitation averages 792.7 Millimeters. Sanborn is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.1 °C | -4.3 °C | 20.83 mm |
| February | -11.7 °C | -1.7 °C | 23.62 mm |
| March | -5.3 °C | 5.4 °C | 44.45 mm |
| April | 1.3 °C | 13.9 °C | 84.07 mm |
| May | 8.4 °C | 20.7 °C | 109.47 mm |
| June | 14.7 °C | 26.2 °C | 122.17 mm |
| July | 16.7 °C | 28.2 °C | 88.65 mm |
| August | 15.4 °C | 26.8 °C | 90.42 mm |
| September | 10.4 °C | 23.3 °C | 82.8 mm |
| October | 3.2 °C | 15.8 °C | 60.71 mm |
| November | -4.3 °C | 6.3 °C | 38.61 mm |
| December | -10.7 °C | -1.6 °C | 26.92 mm |
| Annual | 2 °C | 13.3 °C | 792.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |