These values are estimates based on the IEM's collection of various datasets. Climatology is based on observations back to 1951.
| Location | Growing Degree Days | Precipitation | Temperature | ||||
|---|---|---|---|---|---|---|---|
| Observed | Climate | Observed | Climate | Highest | Lowest | Average | |
| Ames | 22 | 8 | 0.04 | 1.43 | 63 | -4 | 28 |
| Cedar Rapids | 15 | 7 | 0.73 | 2.05 | 59 | -6 | 27 |
| Decorah | 3 | 2 | 1.11 | 1.46 | 54 | -12 | 25 |
| Des Moines | 38 | 12 | 1.09 | 1.99 | 65 | 1 | 31 |
| Dubuque | 4 | 3 | 9.72 | 1.96 | 54 | -6 | 26 |
| Lamoni | 34 | 16 | 1.51 | 1.89 | 63 | 2 | 31 |
| Davenport | 19 | 7 | 1.02 | 2.10 | 58 | 0 | 29 |
| Mason City | 6 | 2 | 0.71 | 1.41 | 57 | -17 | 25 |
| Shenandoah | 47 | 25 | 2.51 | 1.58 | 69 | -7 | 30 |
| Sioux City | 38 | 11 | 1.31 | 1.27 | 68 | -6 | 27 |
| Waterloo | 7 | 4 | 1.19 | 1.56 | 59 | -17 | 26 |