Weather history and climate summary information is available for the following locations:
- Boise
- Mountain Home
- Pocatello
Warmest December Days
The warmest December days in Idaho are:
| Boise, Idaho | 1939 | 69.3°F |
| Mountain Home, Idaho | 2012 | 64.4°F |
| Pocatello, Idaho | 1995 | 64°F |
| Boise, Idaho | 1987 | 63°F |
| Mountain Home, Idaho | 1964 | 63°F |
Coldest December Days
The coldest December days in Idaho were:
| Pocatello, Idaho | 1990 | -29°F |
| Pocatello, Idaho | 1983 | -25.1°F |
| Boise, Idaho | 1990 | -25.1°F |
| Pocatello, Idaho | 1992 | -22°F |
| Mountain Home, Idaho | 1990 | -21.8°F |
Wettest December Days
The wettest single days in December occurred:
| Mountain Home, Idaho | 2010 | 2.5 inches |
| Mountain Home, Idaho | 2009 | 1.3 inches |
| Boise, Idaho | 2009 | 1.1 inches |
| Pocatello, Idaho | 1983 | 0.9 inches |
| Pocatello, Idaho | 1976 | 0.9 inches |