Fredericksburg, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.3 °F (low) to 56.2 °F (high). Annual precipitation averages 38.1 Inches. 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 | 8.1 °F | 25.1 °F | 1.08 in. |
| February | 11.9 °F | 29.2 °F | 1.15 in. |
| March | 23.8 °F | 42.6 °F | 2.02 in. |
| April | 35.5 °F | 57.5 °F | 3.97 in. |
| May | 47.6 °F | 69.5 °F | 4.89 in. |
| June | 58.3 °F | 79.1 °F | 6.17 in. |
| July | 61.5 °F | 82.1 °F | 4.73 in. |
| August | 59.0 °F | 80.1 °F | 4.14 in. |
| September | 50.5 °F | 74.1 °F | 3.79 in. |
| October | 38.2 °F | 60.7 °F | 2.76 in. |
| November | 26.0 °F | 44.2 °F | 1.86 in. |
| December | 14.8 °F | 30.7 °F | 1.57 in. |
| Annual | 36.3 °F | 56.2 °F | 38.13 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 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |