Baldwin, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 58.2 °F (high). Annual precipitation averages 37 Inches. Baldwin 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 | 11.0 °F | 27.9 °F | 1.34 in. |
| February | 14.5 °F | 32.3 °F | 1.57 in. |
| March | 25.9 °F | 45.6 °F | 2.21 in. |
| April | 36.8 °F | 59.5 °F | 3.62 in. |
| May | 48.7 °F | 70.9 °F | 4.33 in. |
| June | 59.0 °F | 80.1 °F | 5.13 in. |
| July | 62.3 °F | 83.0 °F | 4.21 in. |
| August | 59.9 °F | 81.3 °F | 4.18 in. |
| September | 51.2 °F | 75.2 °F | 3.63 in. |
| October | 39.5 °F | 62.3 °F | 2.97 in. |
| November | 27.9 °F | 46.6 °F | 2.1 in. |
| December | 17.6 °F | 33.6 °F | 1.73 in. |
| Annual | 37.9 °F | 58.2 °F | 37.02 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |