Weather history and climate summary information is available for the following locations:
- Des Moines
- Sioux City
Warmest December Days
The warmest December days in Iowa are:
| Sioux City, Iowa | 1998 | 69.1°F |
| Des Moines, Iowa | 1984 | 69.1°F |
| Des Moines, Iowa | 2012 | 69.1°F |
| Des Moines, Iowa | 1975 | 66.9°F |
| Des Moines, Iowa | 1998 | 66.9°F |
Coldest December Days
The coldest December days in Iowa were:
| Sioux City, Iowa | 1989 | -24°F |
| Des Moines, Iowa | 1989 | -22°F |
| Sioux City, Iowa | 1983 | -20.9°F |
| Des Moines, Iowa | 1983 | -18.9°F |
| Sioux City, Iowa | 1978 | -18.9°F |
Wettest December Days
The wettest single days in December occurred:
| Sioux City, Iowa | 2009 | 2 inches |
| Des Moines, Iowa | 1994 | 1.6 inches |
| Des Moines, Iowa | 1982 | 1.6 inches |
| Des Moines, Iowa | 1990 | 1.3 inches |
| Des Moines, Iowa | 1973 | 1.2 inches |