Weather history and climate summary information is available for the following locations:
- Bellingham
- Grant County Airport
- Seattle
- Spokane
- Tacoma
- Walla Walla
- Yakima
Warmest January Days
The warmest January days in Washington are:
| Walla Walla, Washington | 2012 | 69.1°F |
| Walla Walla, Washington | 2005 | 69.1°F |
| Walla Walla, Washington | 1997 | 68°F |
| Walla Walla, Washington | 1992 | 66.9°F |
| Seattle, Washington | 1981 | 66°F |
Coldest January Days
The coldest January days in Washington were:
| Grant County Airport, Washington | 1950 | -25.1°F |
| Spokane, Washington | 1979 | -22°F |
| Spokane, Washington | 2004 | -22°F |
| Spokane, Washington | 1950 | -22°F |
| Spokane, Washington | 1950 | -20.9°F |
Wettest January Days
The wettest single days in January occurred:
| Yakima, Washington | 1973 | 5.4 inches |
| Bellingham, Washington | 1980 | 4.9 inches |
| Tacoma, Washington | 1990 | 3.2 inches |
| Bellingham, Washington | 1995 | 3 inches |
| Tacoma, Washington | 2009 | 2.7 inches |