Agency, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 60.9 °F (high). Annual precipitation averages 38.9 Inches. 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 | 14.4 °F | 31.7 °F | 1.39 in. |
| February | 18.0 °F | 36.4 °F | 1.66 in. |
| March | 28.8 °F | 49.4 °F | 2.31 in. |
| April | 39.8 °F | 62.2 °F | 3.86 in. |
| May | 51.5 °F | 72.2 °F | 5.18 in. |
| June | 61.6 °F | 81.8 °F | 5.48 in. |
| July | 65.1 °F | 85.6 °F | 4.28 in. |
| August | 62.8 °F | 83.8 °F | 4.07 in. |
| September | 53.8 °F | 77.0 °F | 3.88 in. |
| October | 42.2 °F | 64.6 °F | 2.89 in. |
| November | 30.3 °F | 49.2 °F | 2.21 in. |
| December | 20.3 °F | 36.7 °F | 1.67 in. |
| Annual | 40.7 °F | 60.9 °F | 38.88 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |