| Location | Normal High | Normal Low | Warmest High | Coldest High | Warmest Low | Coldest Low | Highest Precipitation | Highest Snowfall | % time it rained |
| Des Moines | 56 | 36 | 86 in 1950 | 34 in 1996 | 61 in 1909 | 18 in 1949 | 1.87 " in 1922 | Trace in several years | 32 % |
| Waterloo | 54 | 32 | 83 in 1950 | 33 in 1996 | 54 in 1950 | 15 in 1917 | 2.35 " in 1900 | 0.4 inches in 1989 | 33 % |
| Mason City | 51 | 31 | 80 in 1950 | 32 in 1996 | 54 in 1974 | 8 in 1925 | 2.15 " in 1935 | 1.3 inches in 1995 | 25 % |
For a look at the forecast for Halloween, click here.