Beacon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 15.8 °C (high). Annual precipitation averages 947.4 Millimeters. Beacon is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.4 °C | -0.8 °C | 29.21 mm |
| February | -8.4 °C | 1.9 °C | 39.62 mm |
| March | -2.6 °C | 9.2 °C | 53.34 mm |
| April | 4.1 °C | 16.4 °C | 96.27 mm |
| May | 10.7 °C | 22.2 °C | 128.78 mm |
| June | 16.7 °C | 27.7 °C | 129.29 mm |
| July | 17.9 °C | 29.8 °C | 107.95 mm |
| August | 17.2 °C | 28.6 °C | 110.24 mm |
| September | 12 °C | 24.7 °C | 91.19 mm |
| October | 5.1 °C | 18.1 °C | 68.33 mm |
| November | -1.4 °C | 8.9 °C | 56.39 mm |
| December | -7.3 °C | 2.3 °C | 36.83 mm |
| Annual | 4.5 °C | 15.8 °C | 947.44 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |