Weather history and climate summary information is available for the following locations:
- Bellingham
- Grant County Airport
- Seattle
- Spokane
- Tacoma
- Walla Walla
- Yakima
Warmest April Days
The warmest April days in Washington are:
| Walla Walla, Washington | 1977 | 96.1°F |
| Grant County Airport, Washington | 1987 | 91.9°F |
| Yakima, Washington | 1977 | 91.9°F |
| Spokane, Washington | 1977 | 90°F |
| Walla Walla, Washington | 1998 | 89.6°F |
Coldest April Days
The coldest April days in Washington were:
| Yakima, Washington | 2008 | 18°F |
| Spokane, Washington | 2008 | 19.4°F |
| Yakima, Washington | 2005 | 19.9°F |
| Yakima, Washington | 2007 | 19.9°F |
| Yakima, Washington | 2011 | 19.9°F |
Wettest April Days
The wettest single days in April occurred:
| Yakima, Washington | 1973 | 5.9 inches |
| Seattle, Washington | 1973 | 5.1 inches |
| Spokane, Washington | 1973 | 4.7 inches |
| Tacoma, Washington | 1991 | 3.2 inches |
| Seattle, Washington | 1991 | 2.4 inches |