Fredericksburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 13.5 °C (high). Annual precipitation averages 968.5 Millimeters. Fredericksburg 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 | -13.3 °C | -3.8 °C | 27.43 mm |
| February | -11.2 °C | -1.6 °C | 29.21 mm |
| March | -4.6 °C | 5.9 °C | 51.31 mm |
| April | 1.9 °C | 14.2 °C | 100.84 mm |
| May | 8.7 °C | 20.8 °C | 124.21 mm |
| June | 14.6 °C | 26.2 °C | 156.72 mm |
| July | 16.4 °C | 27.8 °C | 120.14 mm |
| August | 15 °C | 26.7 °C | 105.16 mm |
| September | 10.3 °C | 23.4 °C | 96.27 mm |
| October | 3.4 °C | 15.9 °C | 70.1 mm |
| November | -3.3 °C | 6.8 °C | 47.24 mm |
| December | -9.6 °C | -0.7 °C | 39.88 mm |
| Annual | 2.4 °C | 13.5 °C | 968.51 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |