Weather history and climate summary information is available for the following locations:
- Casper
- Cheyenne
- Sheridan
Warmest January Days
The warmest January days in Wyoming are:
| Sheridan, Wyoming | 1974 | 69.8°F |
| Sheridan, Wyoming | 2005 | 69.1°F |
| Sheridan, Wyoming | 1981 | 68°F |
| Sheridan, Wyoming | 2008 | 68°F |
| Sheridan, Wyoming | 2002 | 68°F |
Coldest January Days
The coldest January days in Wyoming were:
| Sheridan, Wyoming | 1997 | -34.6°F |
| Casper, Wyoming | 1980 | -32.1°F |
| Casper, Wyoming | 1979 | -30.1°F |
| Sheridan, Wyoming | 1979 | -30.1°F |
| Cheyenne, Wyoming | 1984 | -29°F |
Wettest January Days
The wettest single days in January occurred:
| Sheridan, Wyoming | 1973 | 3.9 inches |
| Sheridan, Wyoming | 1993 | 2.1 inches |
| Sheridan, Wyoming | 1976 | 1.3 inches |
| Cheyenne, Wyoming | 1980 | 1.2 inches |
| Cheyenne, Wyoming | 1976 | 1.1 inches |