Brayton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 15.5 °C (high). Annual precipitation averages 876.3 Millimeters. Brayton 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 | -11.6 °C | -1.2 °C | 20.83 mm |
| February | -9.3 °C | 1.6 °C | 29.46 mm |
| March | -3.2 °C | 8.9 °C | 48.01 mm |
| April | 2.7 °C | 16.3 °C | 90.17 mm |
| May | 9.7 °C | 22.1 °C | 131.83 mm |
| June | 15.6 °C | 27.4 °C | 121.92 mm |
| July | 17.6 °C | 29.3 °C | 101.09 mm |
| August | 15.9 °C | 28.2 °C | 102.62 mm |
| September | 10.8 °C | 24.9 °C | 83.57 mm |
| October | 4.1 °C | 17.8 °C | 71.63 mm |
| November | -2.9 °C | 8.8 °C | 40.39 mm |
| December | -8.4 °C | 1.7 °C | 34.8 mm |
| Annual | 3.4 °C | 15.5 °C | 876.32 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |