Agency, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.1 °C (high). Annual precipitation averages 987.5 Millimeters. Agency is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | -0.2 °C | 35.31 mm |
| February | -7.8 °C | 2.4 °C | 42.16 mm |
| March | -1.8 °C | 9.7 °C | 58.67 mm |
| April | 4.3 °C | 16.8 °C | 98.04 mm |
| May | 10.8 °C | 22.3 °C | 131.57 mm |
| June | 16.4 °C | 27.7 °C | 139.19 mm |
| July | 18.4 °C | 29.8 °C | 108.71 mm |
| August | 17.1 °C | 28.8 °C | 103.38 mm |
| September | 12.1 °C | 25 °C | 98.55 mm |
| October | 5.7 °C | 18.1 °C | 73.41 mm |
| November | -0.9 °C | 9.6 °C | 56.13 mm |
| December | -6.5 °C | 2.6 °C | 42.42 mm |
| Annual | 4.8 °C | 16.1 °C | 987.54 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 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 |