Sanborn, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.6 °F (low) to 55.9 °F (high). Annual precipitation averages 31.2 Inches. 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 | 6.7 °F | 24.3 °F | 0.82 in. |
| February | 10.9 °F | 28.9 °F | 0.93 in. |
| March | 22.4 °F | 41.8 °F | 1.75 in. |
| April | 34.3 °F | 57.0 °F | 3.31 in. |
| May | 47.2 °F | 69.3 °F | 4.31 in. |
| June | 58.4 °F | 79.2 °F | 4.81 in. |
| July | 62.1 °F | 82.7 °F | 3.49 in. |
| August | 59.8 °F | 80.2 °F | 3.56 in. |
| September | 50.8 °F | 73.9 °F | 3.26 in. |
| October | 37.8 °F | 60.4 °F | 2.39 in. |
| November | 24.2 °F | 43.3 °F | 1.52 in. |
| December | 12.7 °F | 29.2 °F | 1.06 in. |
| Annual | 35.6 °F | 55.9 °F | 31.21 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |