| YEAR(S) | JUL | AUG | SEP | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | ANN | |||||||||||||
| 1925-26 | ----- | z | ----- | z | ----- | z | 1.00 | ----- | z | 3.90 | 10.80 | e | 2.90 | ----- | z | 0.50 | ----- | z | ----- | z | 19.10 | g | ||||
| 1926-27 | ----- | z | ----- | z | 0.00 | ----- | z | 1.50 | 13.20 | 13.40 | 10.60 | ----- | z | ----- | z | ----- | z | ----- | z | 38.70 | g | |||||
| 1927-28 | ----- | z | ----- | z | ----- | z | ----- | z | 5.50 | 17.10 | 9.60 | r | 1.60 | ----- | z | ----- | z | ----- | z | ----- | z | 24.20 | i | |||
| 1928-29 | ----- | z | ----- | z | ----- | z | ----- | z | 3.00 | 10.70 | u | 17.80 | 1.60 | ----- | z | 2.00 | ----- | z | ----- | z | 24.40 | h | ||||
| 1929-30 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 2.20 | ----- | z | 4.30 | ----- | z | ----- | z | ----- | z | ----- | z | 6.50 | j | ||
| 1930-31 | ----- | z | ----- | z | ----- | z | ----- | z | 8.30 | 5.90 | a | 11.00 | 2.90 | ----- | z | ----- | z | ----- | z | ----- | z | 28.10 | h | |||
| 1931-32 | ----- | z | ----- | z | ----- | z | ----- | z | 4.00 | 26.00 | 15.90 | 6.30 | 7.30 | ----- | z | ----- | z | ----- | z | 59.50 | g | |||||
| 1932-33 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.40 | 33.00 | 9.90 | 1.50 | a | ----- | z | ----- | z | 0.00 | 66.80 | g | ||||
| 1933-34 | 0.00 | ----- | z | 0.00 | 2.50 | ----- | z | 5.60 | g | 5.00 | 1.00 | y | 0.00 | 0.00 | 0.00 | 0.00 | 7.50 | d | ||||||||
| 1934-35 | ----- | z | 0.00 | 0.00 | 0.00 | ----- | z | 18.00 | t | 34.30 | 3.00 | ----- | z | ----- | z | ----- | z | ----- | z | 37.30 | g | |||||
| 1935-36 | ----- | z | ----- | z | ----- | z | ----- | z | 4.70 | p | 6.80 | f | 13.00 | f | 19.50 | ----- | z | ----- | z | ----- | z | ----- | z | 19.50 | k | |
| 1936-37 | ----- | z | ----- | z | ----- | z | ----- | z | 0.10 | 7.90 | b | 39.00 | 39.50 | 1.50 | 0.00 | ----- | z | 0.00 | 88.00 | e | ||||||
| 1937-38 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.00 | 12.00 | 28.50 | ----- | z | ----- | z | ----- | z | ----- | z | 63.50 | i | |||
| 1938-39 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9.70 | w | 13.70 | w | 12.20 | t | 5.80 | ----- | z | ----- | z | ----- | z | 5.80 | k | |
| 1939-40 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 6.10 | 13.90 | t | ----- | z | ----- | z | ----- | z | ----- | z | 6.10 | k | |
| 1940-41 | ----- | z | ----- | z | ----- | z | ----- | z | 8.30 | 3.00 | 7.80 | 0.50 | 0.00 | t | ----- | z | ----- | z | ----- | z | 19.60 | h | ||||
| 1941-42 | ----- | z | ----- | z | ----- | z | ----- | z | 0.10 | 5.40 | e | 2.30 | 6.70 | 0.30 | 0.00 | ----- | z | ----- | z | 14.80 | f | |||||
| 1942-43 | ----- | z | ----- | z | ----- | z | ----- | z | 12.00 | 13.50 | 12.10 | 10.30 | 2.80 | 0.00 | 0.00 | 0.00 | 50.70 | d | ||||||||
| 1943-44 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.30 | 10.70 | 10.50 | 1.20 | 0.00 | 0.00 | 0.00 | 23.70 | |||||||||||||
| 1944-45 | 0.00 | 0.00 | 0.00 | 0.00 | 3.70 | 2.80 | 5.00 | 3.20 | 2.90 | 2.30 | 0.00 | 0.00 | 19.90 | |||||||||||||
| 1945-46 | 0.00 | 0.00 | 0.00 | 0.00 | 10.40 | 7.50 | 8.90 | 10.30 | 1.50 | 0.20 | 0.00 | 0.00 | 38.80 | |||||||||||||
| 1946-47 | 0.00 | 0.00 | 0.00 | 0.00 | 11.80 | 6.50 | 11.20 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 30.00 | |||||||||||||
| 1947-48 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 8.70 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | c | 8.70 | e | ||||||
| 1948-49 | 0.00 | 0.00 | 0.00 | 0.00 | 5.70 | 30.70 | 11.20 | 22.10 | 3.10 | 0.00 | 0.00 | 0.00 | 72.80 | |||||||||||||
| 1949-50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 10.40 | a | 33.20 | b | 6.00 | 5.00 | 0.00 | 0.00 | 0.00 | 54.60 | |||||||||||
| 1950-51 | 0.00 | 0.00 | 0.00 | 0.00 | 11.00 | 16.40 | 23.90 | 11.20 | 14.00 | 0.00 | 0.00 | 0.00 | 76.50 | |||||||||||||
| 1951-52 | 0.00 | 0.00 | 0.00 | 1.00 | 1.00 | 28.40 | 26.50 | 8.20 | 0.00 | 0.00 | 0.00 | 0.00 | 65.10 | |||||||||||||
| 1952-53 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 18.50 | 5.10 | 3.20 | 0.00 | 0.00 | 0.00 | 0.00 | 27.00 | |||||||||||||
| 1953-54 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 3.10 | 27.30 | a | 7.00 | 0.00 | 0.00 | 0.00 | 0.00 | 37.40 | ||||||||||||
| 1954-55 | 0.00 | 0.00 | 0.00 | 0.00 | a | 0.00 | 3.00 | 15.70 | 7.80 | 0.50 | 2.00 | 0.00 | 0.00 | 29.00 | ||||||||||||
| 1955-56 | 0.00 | 0.00 | 0.00 | 0.00 | a | 11.20 | b | 24.60 | 10.50 | a | 7.60 | 6.50 | 0.00 | 0.00 | 0.00 | 60.40 | ||||||||||
| 1956-57 | 0.00 | 0.00 | 0.00 | 0.00 | 0.80 | 6.10 | 25.00 | 6.10 | 9.20 | 0.00 | 0.00 | 0.00 | 47.20 | |||||||||||||
| 1957-58 | 0.00 | 0.00 | 0.00 | 1.20 | 1.00 | 10.60 | 3.50 | 0.00 | 1.20 | 0.00 | 0.00 | 0.00 | 17.50 | |||||||||||||
| 1958-59 | 0.00 | 0.00 | 0.00 | 0.00 | 14.90 | 5.90 | 14.80 | 11.70 | 0.00 | 0.00 | 0.00 | 0.00 | 47.30 | |||||||||||||
| 1959-60 | 0.00 | 0.00 | 0.00 | 0.00 | 8.50 | 9.00 | 11.00 | 3.10 | 8.20 | 0.00 | 0.00 | 0.00 | 39.80 | |||||||||||||
| 1960-61 | 0.00 | 0.00 | 0.00 | 0.00 | 4.50 | 6.60 | 4.20 | 1.60 | 1.60 | 0.00 | 0.00 | 0.00 | 18.50 | |||||||||||||
| 1961-62 | 0.00 | 0.00 | 0.00 | 0.00 | 15.20 | 30.90 | 13.70 | 1.00 | 11.40 | 0.00 | 0.00 | 0.00 | 72.20 | |||||||||||||
| 1962-63 | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 | 3.10 | 0.90 | 7.10 | 0.00 | 0.00 | 0.00 | 0.00 | 11.30 | |||||||||||||
| 1963-64 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | 17.50 | a | 28.70 | 2.30 | 6.30 | 2.00 | 0.00 | 0.00 | 57.80 | ||||||||||||
| 1964-65 | 0.00 | 0.00 | 0.00 | 0.00 | 5.00 | 42.20 | 29.40 | 4.30 | 0.80 | 0.00 | 0.00 | 0.00 | 81.70 | |||||||||||||
| 1965-66 | 0.00 | 0.00 | 0.00 | 0.00 | 5.70 | 28.60 | 18.70 | 2.00 | 0.00 | 0.00 | 0.00 | 0.00 | 55.00 | |||||||||||||
| 1966-67 | 0.00 | 0.00 | 0.00 | 0.00 | 3.20 | 5.10 | 6.50 | 2.30 | 7.70 | 0.00 | 0.00 | 0.00 | 24.80 | |||||||||||||
| 1967-68 | 0.00 | 0.00 | 0.00 | 0.00 | 6.30 | 18.10 | 18.00 | 5.30 | 0.00 | 0.00 | 0.00 | 0.00 | 47.70 | |||||||||||||
| 1968-69 | 0.00 | 0.00 | ----- | z | 0.00 | 1.10 | 18.10 | 63.30 | 8.00 | 1.60 | 0.00 | 0.00 | 0.00 | 92.10 | a | |||||||||||
| 1969-70 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 13.00 | 22.10 | 4.50 | 4.50 | 0.00 | 0.00 | 0.00 | 44.10 | |||||||||||||
| 1970-71 | 0.00 | 0.00 | 0.00 | 0.00 | 7.50 | 33.50 | 17.00 | 7.50 | 7.00 | 0.00 | 0.00 | 0.00 | 72.50 | |||||||||||||
| 1971-72 | 0.00 | 0.00 | 0.00 | 1.70 | 6.30 | 32.70 | 10.30 | 5.00 | 2.00 | 0.00 | 0.00 | 0.00 | 58.00 | |||||||||||||
| 1972-73 | 0.00 | 0.00 | 0.00 | 2.30 | 0.80 | 5.50 | 14.50 | 3.50 | 0.50 | 0.00 | 0.00 | 0.00 | 27.10 | |||||||||||||
| 1973-74 | 0.00 | 0.00 | 0.00 | 0.00 | 35.00 | 5.30 | 10.50 | 4.50 | 0.00 | 0.00 | 0.00 | 0.00 | 55.30 | |||||||||||||
| 1974-75 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 19.30 | 18.50 | 19.00 | 5.50 | 2.00 | 0.00 | 0.00 | 64.30 | |||||||||||||
| 1975-76 | 0.00 | 0.00 | ----- | z | 0.00 | 2.80 | 10.00 | 18.50 | 5.50 | 3.50 | 0.00 | 0.00 | 0.00 | 40.30 | a | |||||||||||
| 1976-77 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 4.00 | 7.00 | 1.00 | 2.30 | 0.00 | 0.00 | 0.00 | 14.30 | |||||||||||||
| 1977-78 | 0.00 | 0.00 | 0.00 | 0.00 | ----- | z | 31.50 | 8.50 | a | 7.20 | 6.00 | 0.00 | 0.00 | 0.00 | 53.20 | a | ||||||||||
| 1978-79 | 0.00 | 0.00 | 0.00 | 0.00 | 5.90 | 11.70 | 7.60 | 7.10 | 0.00 | 0.00 | 0.00 | 0.00 | 32.30 | |||||||||||||
| 1979-80 | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 | a | 14.00 | 16.50 | 7.30 | 3.30 | 0.00 | 0.00 | 0.00 | 42.10 | ||||||||||||
| 1980-81 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 4.90 | 0.50 | 0.70 | 0.00 | 0.00 | 0.00 | 0.00 | 6.60 | |||||||||||||
| 1981-82 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 10.90 | 25.30 | 1.30 | a | 1.00 | 0.00 | 0.00 | 0.00 | b | 38.50 | |||||||||||
| 1982-83 | 0.00 | 0.00 | 0.00 | 0.00 | 2.50 | 19.70 | a | ----- | z | 2.50 | 0.00 | 0.00 | 0.00 | 0.00 | 24.70 | a | ||||||||||
| 1983-84 | 0.00 | 0.00 | 0.00 | 0.00 | 2.50 | 13.40 | a | 7.20 | 2.50 | a | 0.00 | 0.00 | 0.00 | 0.00 | 25.60 | |||||||||||
| 1984-85 | 0.00 | 0.00 | 0.00 | 0.30 | 6.50 | e | 16.20 | a | 2.50 | 14.80 | 1.60 | 0.00 | 0.00 | 0.00 | 41.90 | |||||||||||
| 1985-86 | 0.00 | 0.00 | 0.00 | 0.00 | 10.30 | 6.50 | 19.30 | 10.00 | a | 0.00 | 0.00 | 0.00 | 0.00 | 46.10 | ||||||||||||
| 1986-87 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 5.30 | 7.30 | 0.00 | 0.00 | 0.00 | 0.00 | ----- | z | 13.10 | a | |||||||||||
| 1987-88 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 16.20 | a | 6.80 | 3.20 | a | 1.00 | 0.00 | 0.00 | 0.00 | 27.20 | |||||||||||
| 1988-89 | 0.00 | 0.00 | 0.00 | 0.00 | 4.30 | 12.80 | a | 6.50 | 9.50 | a | 4.00 | 0.00 | 0.00 | 0.00 | 37.10 | |||||||||||
| 1989-90 | 0.00 | 0.00 | 0.00 | 0.00 | 3.50 | 0.30 | 14.80 | a | 19.20 | b | 0.00 | 0.00 | 0.00 | 0.00 | 37.80 | |||||||||||
| 1990-91 | 0.00 | 0.00 | 0.00 | 0.00 | 3.50 | 7.50 | b | 9.50 | b | 0.10 | a | 6.00 | 0.00 | 0.00 | 0.00 | 26.60 | ||||||||||
| 1991-92 | 0.00 | 0.00 | 0.00 | 0.00 | a | 6.50 | 4.00 | 17.60 | 1.50 | a | 0.00 | 0.00 | 0.00 | 0.00 | 29.60 | |||||||||||
| 1992-93 | 0.00 | 0.00 | 0.00 | 0.00 | 6.60 | w | 25.20 | b | 14.50 | t | 19.50 | 2.50 | 0.00 | 0.00 | 0.00 | 47.20 | b | |||||||||
| 1993-94 | 0.00 | 0.00 | 0.00 | 0.00 | 1.30 | 23.00 | s | 0.80 | w | 3.50 | v | 0.00 | 0.00 | 0.00 | 0.00 | 1.30 | c | |||||||||
| 1994-95 | 0.00 | 0.00 | 0.00 | 0.00 | 15.80 | t | 7.10 | w | ----- | z | 13.00 | 0.00 | a | 0.00 | 0.00 | 0.00 | 13.00 | c | ||||||||
| 1995-96 | 0.00 | 0.00 | 0.00 | 0.00 | ----- | z | ----- | z | 14.30 | 2.10 | y | 0.10 | 0.00 | 0.00 | 0.00 | 14.40 | c | |||||||||
| 1996-97 | 0.00 | 0.00 | 0.00 | ----- | z | 26.60 | c | 42.30 | d | 13.40 | b | 7.00 | a | ----- | z | 0.00 | 0.00 | 0.00 | 89.30 | b | ||||||
| 1997-98 | 0.00 | 0.00 | 0.00 | 0.00 | 0.10 | x | 10.10 | a | 19.10 | 2.50 | 0.00 | 0.00 | 0.00 | 0.00 | 31.70 | a | ||||||||||
| 1998-99 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 15.30 | 8.40 | a | 7.50 | 1.50 | a | 0.00 | 0.00 | 0.00 | 32.70 | |||||||||||
| 1999-00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 1.80 | c | 18.00 | g | 1.50 | 0.50 | a | 0.00 | 0.00 | 0.00 | 3.80 | a | |||||||||
| 2000-01 | 0.00 | 0.00 | 0.00 | 0.00 | 10.60 | c | 16.20 | c | 6.90 | b | 18.40 | 1.00 | a | 0.00 | 0.00 | a | 0.00 | 53.10 | ||||||||
| 2001-02 | 0.00 | 0.00 | 0.00 | 0.00 | ----- | z | 27.50 | 13.30 | g | 3.00 | c | ----- | z | 0.00 | 0.00 | 0.00 | 30.50 | c | ||||||||
| 2002-03 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | a | 19.50 | c | 16.80 | a | 0.00 | a | ----- | z | 0.00 | 0.00 | 0.00 | 36.30 | a | |||||||
| 2003-04 | 0.00 | 0.00 | 0.00 | 0.00 | 0.80 | a | 8.70 | a | 11.50 | a | ----- | z | 0.00 | 0.00 | 0.00 | ----- | z | 21.00 | b | |||||||
| 2004-05 | 0.00 | 0.00 | 0.00 | 0.00 | 3.00 | c | 23.30 | 36.00 | 0.00 | ----- | z | 0.00 | 0.00 | 0.00 | 62.30 | a | ||||||||||
| 2005-06 | 0.00 | 0.00 | 0.00 | 0.00 | a | 3.00 | 2.50 | b | 5.00 | 2.70 | 2.50 | 0.00 | 0.00 | 0.00 | 15.70 | |||||||||||
| 2006-07 | 0.00 | 0.00 | 0.00 | 0.00 | a | ----- | z | 7.60 | a | 5.00 | 9.00 | 0.50 | 0.00 | 0.00 | 0.00 | a | 22.10 | a | ||||||||
| 2007-08 | 0.00 | 0.00 | 0.00 | 0.00 | 2.00 | a | 7.50 | e | 22.00 | b | 0.60 | a | 3.50 | c | 1.00 | 0.00 | 0.00 | a | 36.60 | |||||||
| 2008-09 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | b | 28.30 | 8.20 | 1.10 | 0.10 | 5.50 | 0.00 | 0.00 | 43.20 | ||||||||||||
| 2009-10 | 0.00 | a | 0.00 | 0.00 | 0.00 | 0.00 | 4.40 | a | 1.80 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 6.20 | |||||||||||
| 2010-11 | 0.00 | 0.00 | 0.00 | 0.00 | 10.10 | 14.80 | 10.00 | b | 1.80 | i | 1.00 | q | ----- | z | ----- | z | ----- | z | 34.90 | e | ||||||
| 2011-12 | 0.00 | ----- | z | ----- | z | 0.00 | 10.80 | k | 3.50 | j | 13.00 | j | 6.50 | m | 5.00 | i | 0.00 | u | ----- | z | ----- | z | 0.00 | j | ||
| 2012-13 | ----- | z | ----- | z | ----- | z | ----- | z | 1.00 | q | 18.50 | k | 12.50 | k | 1.00 | m | 0.00 | y | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2013-14 | 0.00 | ----- | z | ----- | z | 0.00 | 0.00 | m | 2.40 | j | 7.70 | h | 5.00 | i | 2.50 | k | ----- | z | ----- | z | ----- | z | 0.00 | j | ||
| 2014-15 | 0.00 | ----- | z | 0.00 | 0.00 | a | 0.50 | y | 0.00 | l | 8.50 | q | 1.20 | w | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | i | ||
| 2015-16 | ----- | z | ----- | z | 0.00 | 0.00 | 1.60 | y | 9.40 | g | 5.50 | n | 2.20 | j | ----- | z | 0.00 | 0.00 | 0.00 | 0.00 | g | |||||
| 2016-17 | ----- | z | 0.00 | ----- | z | ----- | z | ----- | z | 15.10 | p | 13.60 | o | 18.10 | j | 3.40 | l | ----- | z | ----- | z | ----- | z | 0.00 | k | |
| 2017-18 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 2.40 | v | 6.80 | l | 12.50 | p | 0.50 | s | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2018-19 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 6.50 | i | 9.50 | j | 21.10 | 5.30 | 0.00 | 0.00 | 0.00 | 26.40 | g | |||||
| 2019-20 | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | w | 10.40 | m | 13.60 | k | 4.90 | n | 0.00 | u | ----- | z | ----- | z | ----- | z | 0.00 | l |
| 2020-21 | ----- | z | ----- | z | ----- | z | ----- | z | 9.10 | u | 14.80 | i | 5.50 | l | 1.50 | k | ----- | z | ----- | z | ----- | z | 0.00 | 0.00 | k | |
| 2021-22 | ----- | z | ----- | z | 0.00 | 0.00 | 3.70 | 13.80 | f | 16.10 | k | 1.30 | j | 0.00 | e | 0.00 | 0.00 | 0.00 | 3.70 | e | ||||||
| 2022-23 | 0.00 | 0.00 | 0.00 | 0.00 | 18.60 | i | 19.00 | j | 0.00 | o | 5.50 | l | 0.00 | f | 0.00 | 0.00 | 0.00 | 0.00 | e | |||||||
| 2023-24 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 7.30 | a | 11.50 | h | 0.00 | h | 1.70 | d | ----- | z | ----- | z | ----- | z | 9.00 | e | |||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 0.00 | 0.00 | 0.00 | 0.13 | 4.53 | 13.69 | 14.59 | 6.89 | 2.35 | 0.24 | 0.00 | 0.00 | 40.21 | |||||||||||||
| S.D. | 0.00 | 0.00 | 0.00 | 0.47 | 6.09 | 10.06 | 10.56 | 7.13 | 3.05 | 0.81 | 0.00 | 0.00 | 18.91 | |||||||||||||
| SKEW | 0.00 | 0.00 | 0.00 | 3.85 | 2.60 | 0.91 | 1.74 | 1.98 | 1.60 | 4.50 | 0.00 | 0.00 | 0.29 | |||||||||||||
| MAX | 0.00 | 0.00 | 0.00 | 2.50 | 35.00 | 42.30 | 63.30 | 39.50 | 14.00 | 5.50 | 0.00 | 0.00 | 81.70 | |||||||||||||
| MIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.30 | 0.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 6.20 | |||||||||||||
| YRS | 74 | 72 | 74 | 77 | 72 | 78 | 75 | 79 | 72 | 76 | 72 | 74 | 49 | |||||||||||||