Weather history and climate summary information is available for the following locations:
- Boise
- Mountain Home
- Pocatello
Warmest January Days
The warmest January days in Idaho are:
| Mountain Home, Idaho | 1953 | 64°F |
| Boise, Idaho | 1992 | 61°F |
| Mountain Home, Idaho | 1992 | 61°F |
| Boise, Idaho | 1997 | 60.1°F |
| Mountain Home, Idaho | 1970 | 60.1°F |
Coldest January Days
The coldest January days in Idaho were:
| Pocatello, Idaho | 1979 | -27.9°F |
| Pocatello, Idaho | 1984 | -27.9°F |
| Pocatello, Idaho | 1982 | -24°F |
| Pocatello, Idaho | 1985 | -22°F |
| Mountain Home, Idaho | 1962 | -22°F |
Wettest January Days
The wettest single days in January occurred:
| Boise, Idaho | 1996 | 3.4 inches |
| Pocatello, Idaho | 1973 | 3 inches |
| Boise, Idaho | 1973 | 1.5 inches |
| Boise, Idaho | 2012 | 1.1 inches |
| Pocatello, Idaho | 1980 | 0.9 inches |