| Year | Max Depth (inches) | Date |
|---|---|---|
| 2019 | 1.2 | January 21 |
| 2018 | none | – |
| 2017 | 9.1 | January 11 |
| 2016 | 9.8 | December 16 |
| 2015 | 3.1 | December 3 |
| 2014 | 9.8 | February 9 |
| 2013 | 2.0 | December 3 |
| 2012 | 5.1 | January 20 |
| 2011 | 2.0 | January 1 |
| 2010 | 7.9 | November 22 |
| 2005 | none | – |
| 2004 | none | – |
| 2003 | none | – |
| 2002 | none | – |
| 2001 | 1.0 | January 18 |
| 2000 | 2.0 | January 24 |
| 1999 | none | – |
| 1995 | 8.0 | February 13 |
| 1994 | 14.0 | February 25 |
| 1993 | 10.0 | January 16 |
| 1992 | 3.0 | December 19 |
| 1991 | 2.0 | January 7 |
| 1990 | 6.0 | December 20 |
| 1989 | 5.0 | March 3 |
| 1988 | 5.0 | January 12 |
| 1987 | 3.0 | January 19 |
| 1986 | 7.0 | January 1 |
| 1985 | 14.0 | November 22 |
| 1984 | 7.0 | January 1 |
| 1983 | 9.0 | December 30 |
| 1982 | 6.0 | January 3 |
| 1981 | 3.0 | December 29 |
| 1980 | 12.0 | January 10 |
| 1979 | 10.0 | January 15 |
| 1978 | 11.0 | January 3 |
| 1977 | 9.0 | December 31 |
| 1976 | 1.0 | December 23 |
| 1975 | 5.0 | January 27 |
| 1974 | 8.0 | January 13 |
| 1973 | 8.0 | December 30 |
| 1972 | 7.0 | February 6 |
| 1971 | 4.0 | December 30 |
| 1970 | 7.0 | January 17 |
| 1969 | 17.0 | January 31 |
| 1968 | 9.0 | December 29 |
| 1967 | 3.0 | December 22 |
| 1966 | 3.0 | January 3 |
| 1965 | 3.0 | January 11 |
| 1964 | 4.0 | December 21 |
| 1963 | 5.0 | February 1 |
| 1962 | 3.0 | March 1 |
| 1961 | 6.0 | December 10 |
| 1960 | 10.0 | January 17 |
| 1959 | 5.0 | December 31 |
| 1958 | 2.0 | January 2 |
| 1957 | 11.0 | January 24 |
| 1956 | 9.0 | January 29 |
| 1955 | 6.0 | December 19 |
| 1954 | 5.0 | January 22 |
| 1953 | none | – |
| 1952 | 3.0 | January 13 |
| 1951 | 5.0 | December 20 |
| 1950 | 11.0 | January 16 |
| 1949 | 4.0 | February 6 |
| Years | Station | Coordinates |
|---|---|---|
| 1949–2024 | Walla Walla Regional Airport | location |