Birmingham, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 61.5 °F (high). Annual precipitation averages 38.2 Inches. Birmingham 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 | 15.1 °F | 32.2 °F | 1.44 in. |
| February | 18.6 °F | 36.8 °F | 1.76 in. |
| March | 29.3 °F | 49.8 °F | 2.3 in. |
| April | 40.1 °F | 63.0 °F | 3.74 in. |
| May | 51.8 °F | 73.0 °F | 5.37 in. |
| June | 61.7 °F | 82.4 °F | 4.97 in. |
| July | 65.4 °F | 86.1 °F | 4.15 in. |
| August | 63.0 °F | 84.5 °F | 3.85 in. |
| September | 54.2 °F | 77.9 °F | 3.66 in. |
| October | 42.6 °F | 65.0 °F | 2.95 in. |
| November | 31.0 °F | 49.9 °F | 2.27 in. |
| December | 21.0 °F | 37.3 °F | 1.71 in. |
| Annual | 41.2 °F | 61.5 °F | 38.17 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |