YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1922 | ----- | z | ----- | z | ----- | z | ----- | z | 30.57 | j | 37.97 | 38.13 | 40.45 | 30.10 | 27.45 | 20.23 | 10.94 | 29.32 | e | |||||||
1923 | 18.42 | 5.14 | 22.00 | 29.57 | 35.55 | 40.97 | 44.13 | 37.19 | 32.28 | a | 32.19 | 23.97 | a | 16.19 | 28.13 | |||||||||||
1924 | 7.94 | 23.69 | 22.00 | 26.70 | 32.03 | a | 36.27 | 37.23 | 34.90 | 32.97 | 30.94 | 25.03 | 8.16 | 26.49 | ||||||||||||
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.41 | c | 42.42 | 39.35 | 36.53 | 26.03 | 25.20 | 23.58 | 33.65 | e | ||||||
1926 | 13.03 | a | 26.25 | 27.35 | 32.33 | 34.35 | 37.20 | 41.65 | 39.26 | 29.53 | 26.84 | 27.87 | 17.20 | a | 29.41 | |||||||||||
1927 | 14.55 | 24.00 | 25.42 | 27.17 | 32.87 | 40.43 | 37.94 | 38.10 | 37.79 | a | 32.00 | 31.33 | 7.42 | 29.08 | ||||||||||||
1928 | 16.68 | 14.00 | 26.61 | 28.47 | 32.11 | d | 37.13 | 41.65 | 34.26 | 29.87 | 28.32 | 26.93 | 12.03 | 27.34 | ||||||||||||
1929 | 2.77 | a | 6.04 | 24.00 | 26.50 | 30.97 | 37.63 | 36.74 | 36.48 | 28.00 | 22.90 | 12.80 | 23.29 | 24.01 | ||||||||||||
1930 | -4.35 | 25.93 | a | 25.90 | 29.50 | 32.39 | 33.60 | 37.32 | 37.87 | 31.43 | 26.52 | 16.03 | 6.29 | 24.87 | ||||||||||||
1931 | 14.81 | 17.21 | 24.77 | 26.83 | 31.94 | 37.20 | 37.74 | 33.94 | 31.33 | 24.13 | 17.43 | 7.65 | 25.42 | |||||||||||||
1932 | 7.37 | a | 6.72 | 25.35 | 27.83 | 32.52 | 35.40 | 37.58 | 34.52 | 26.23 | 26.84 | 26.83 | a | 7.87 | 24.59 | |||||||||||
1933 | 11.74 | 7.30 | a | 21.58 | 25.90 | 30.45 | 38.47 | 37.10 | 37.32 | 30.90 | 27.52 | 23.37 | 30.13 | 26.81 | ||||||||||||
1934 | 27.87 | 27.57 | 27.48 | 31.87 | 34.68 | 37.80 | 38.71 | 36.16 | 30.20 | 30.35 | 30.93 | 19.81 | 31.12 | |||||||||||||
1935 | 13.03 | a | 16.82 | 21.68 | 26.83 | 28.13 | 36.20 | 39.58 | 33.94 | 28.70 | 25.61 | 17.23 | 15.71 | 25.29 | ||||||||||||
1936 | 16.90 | 11.17 | 22.77 | 30.40 | 35.94 | 41.07 | 39.84 | 35.71 | 30.20 | 21.48 | 11.07 | 19.06 | 26.30 | |||||||||||||
1937 | -9.58 | 12.07 | 24.55 | 28.77 | 30.68 | 38.13 | 40.35 | 35.23 | 33.57 | 32.55 | 30.70 | 26.23 | 26.94 | |||||||||||||
1938 | 22.16 | 23.93 | 26.84 | 29.97 | 31.90 | 38.13 | 41.52 | 34.13 | 36.97 | 32.71 | 20.10 | 19.13 | 29.79 | |||||||||||||
1939 | 22.81 | 12.93 | 21.80 | a | 27.17 | 32.03 | 35.83 | 40.23 | 35.68 | 31.10 | 27.68 | 18.30 | 26.00 | 27.63 | ||||||||||||
1940 | 15.26 | 22.93 | 27.45 | 29.67 | 33.77 | 35.90 | 41.16 | 35.16 | 42.37 | 33.65 | 17.40 | 19.77 | 29.54 | |||||||||||||
1941 | 22.06 | 24.07 | 23.39 | 27.37 | 35.65 | 40.33 | 42.90 | 43.23 | 35.23 | 30.42 | 25.30 | 23.32 | 31.11 | |||||||||||||
1942 | 6.16 | 11.32 | 18.74 | 27.87 | 34.06 | 35.63 | 39.48 | 35.68 | 25.73 | 24.13 | 24.33 | 18.06 | 25.10 | |||||||||||||
1943 | 5.32 | 15.04 | 17.58 | 29.63 | 29.84 | 35.17 | 39.35 | 35.71 | 31.23 | 30.90 | 25.13 | 16.13 | 25.92 | |||||||||||||
1944 | 13.35 | 16.93 | 20.19 | 29.48 | a | 31.81 | 36.77 | 37.87 | 35.16 | 34.00 | 28.32 | 22.57 | 16.39 | 26.90 | ||||||||||||
1945 | 15.71 | 22.39 | 25.23 | 28.33 | 35.26 | 36.83 | 36.84 | 39.03 | 32.07 | 25.81 | 25.37 | 15.77 | 28.22 | |||||||||||||
1946 | 14.77 | 16.64 | 25.42 | 26.10 | 33.06 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.20 | g | |||||
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.52 | d | 37.88 | e | 27.94 | n | 24.72 | m | 21.73 | o | 2.30 | k | 38.70 | j |
1949 | -11.78 | d | 13.61 | e | 24.48 | d | 27.36 | e | 35.36 | c | 32.73 | o | 35.73 | p | 36.58 | s | 32.43 | p | ----- | z | 24.89 | l | 18.04 | c | 17.84 | f |
1950 | 6.03 | a | 16.75 | 22.52 | 25.78 | g | 28.26 | h | 39.38 | f | 40.45 | 39.32 | 32.27 | 36.52 | 29.83 | 29.58 | 28.14 | c | ||||||||
1951 | 14.97 | 21.86 | 20.68 | 24.67 | 34.45 | 36.30 | 40.84 | 36.77 | 32.63 | 30.48 | 24.20 | 16.71 | 27.88 | |||||||||||||
1952 | 9.23 | 14.31 | 21.68 | 28.53 | 36.06 | 39.57 | 39.39 | 39.42 | 34.47 | 25.94 | 12.97 | 16.39 | 26.50 | |||||||||||||
1953 | 28.68 | 22.04 | 25.16 | 29.97 | 32.50 | a | 37.23 | 37.74 | 42.10 | 33.40 | 27.23 | a | 29.03 | 23.55 | 30.72 | |||||||||||
1954 | 21.84 | 26.00 | 20.87 | 28.63 | 32.73 | a | 37.80 | 39.16 | 37.45 | 33.50 | 25.32 | 27.38 | f | ----- | z | 30.33 | b | |||||||||
1955 | ----- | z | ----- | z | ----- | z | 27.38 | a | 31.55 | 36.83 | a | 41.00 | 32.46 | c | 30.52 | g | 31.29 | c | 22.24 | e | 17.57 | a | 30.04 | d | ||
1956 | 16.61 | 9.00 | 21.68 | 29.00 | 39.06 | 37.83 | 42.48 | f | 39.10 | k | 33.40 | 28.77 | 18.20 | 20.00 | 25.36 | b | ||||||||||
1957 | 0.00 | 14.68 | 27.48 | 30.03 | 38.39 | c | 38.48 | e | 37.10 | 32.92 | s | 31.70 | g | 32.00 | 21.33 | 23.00 | 26.25 | b | ||||||||
1958 | 20.77 | 29.70 | a | 20.90 | 30.86 | b | 37.00 | j | 41.82 | b | 41.90 | k | ----- | z | ----- | z | 23.62 | e | 24.90 | 25.94 | 27.31 | d | ||||
1959 | 24.16 | 22.60 | c | ----- | z | ----- | z | ----- | z | 38.50 | p | 37.23 | 35.52 | 37.87 | 30.13 | a | 18.60 | 16.39 | 27.81 | d | ||||||
1960 | 6.77 | a | 15.17 | 22.48 | 28.73 | 33.39 | 34.80 | 39.16 | 37.74 | 32.10 | 27.34 | b | 25.40 | 16.87 | 26.66 | |||||||||||
1961 | 19.61 | 30.00 | 25.68 | 28.57 | 33.42 | 38.53 | 37.76 | b | 40.35 | h | 29.47 | 27.28 | b | 15.73 | 17.29 | 27.58 | a | |||||||||
1962 | 12.48 | 18.86 | 20.58 | 28.70 | 34.81 | 32.83 | 36.45 | 39.81 | 32.53 | 30.26 | 26.67 | 22.10 | 28.01 | |||||||||||||
1963 | 7.48 | 27.57 | 25.13 | 28.30 | 34.45 | 37.40 | 36.58 | 38.19 | 37.37 | 31.45 | 26.73 | 18.33 | a | 29.08 | ||||||||||||
1964 | 19.32 | 15.17 | 23.16 | 25.17 | ----- | z | 31.40 | 40.68 | 37.52 | 30.43 | 26.16 | 23.10 | 19.10 | 26.47 | a | |||||||||||
1965 | 19.29 | 23.50 | 21.03 | 31.43 | 31.13 | 38.68 | b | 41.23 | 43.19 | 29.03 | 27.48 | 27.57 | 15.37 | a | 29.08 | |||||||||||
1966 | 19.68 | 16.14 | 23.10 | 26.93 | 30.84 | 38.27 | 38.48 | 37.74 | 36.63 | 26.00 | 28.69 | a | 23.00 | 28.79 | ||||||||||||
1967 | 24.16 | 22.54 | 24.26 | 27.20 | 32.23 | 39.43 | 39.45 | 39.87 | 35.83 | 28.35 | 23.90 | 15.39 | 29.38 | |||||||||||||
1968 | 15.61 | 26.89 | a | 25.29 | 25.60 | 31.97 | 37.97 | a | 39.74 | 42.61 | 34.48 | a | 24.87 | 26.03 | 16.97 | 29.00 | ||||||||||
1969 | 11.94 | 13.68 | 18.48 | 28.86 | h | 34.86 | j | 42.50 | h | 38.62 | b | 35.13 | 34.53 | 24.65 | 21.63 | 21.10 | 24.42 | c | ||||||||
1970 | 17.06 | 23.18 | 22.65 | 24.30 | 31.71 | 43.87 | 42.65 | 36.58 | 30.63 | 25.32 | 26.07 | c | 11.77 | 27.98 | ||||||||||||
1971 | 19.34 | b | 21.46 | 19.84 | 27.30 | 34.10 | a | 39.60 | 42.97 | 42.31 | b | 28.70 | 22.77 | a | 23.47 | 17.44 | d | 28.28 | ||||||||
1972 | 14.14 | c | 19.14 | 27.10 | 25.60 | 32.48 | 41.45 | a | 40.19 | 40.20 | a | 30.14 | a | 26.41 | b | 25.69 | a | 9.16 | 27.64 | |||||||
1973 | 11.61 | 20.37 | a | 24.33 | a | 24.17 | a | 30.39 | 37.60 | 37.67 | a | 36.65 | 35.00 | b | 27.86 | b | 28.14 | a | 27.29 | 28.42 | ||||||
1974 | 9.37 | d | 23.89 | 25.23 | 30.03 | a | 33.35 | 39.70 | 40.52 | 37.86 | b | 27.23 | 20.55 | 23.97 | 17.77 | 27.46 | ||||||||||
1975 | 17.06 | 18.00 | a | 22.00 | a | 25.40 | 32.10 | 36.83 | 44.33 | a | 38.32 | 28.48 | a | 31.10 | 20.87 | 21.73 | a | 28.02 | ||||||||
1976 | 14.58 | 17.81 | b | 20.10 | a | 28.07 | b | 31.58 | 34.90 | 40.97 | a | 43.26 | 34.17 | 22.81 | 24.07 | 14.33 | a | 27.22 | ||||||||
1977 | 7.03 | 20.63 | a | 22.52 | 25.80 | 32.37 | a | 39.27 | 39.61 | 42.45 | 34.20 | 28.48 | 23.45 | a | 23.97 | 28.31 | ||||||||||
1978 | 21.45 | 25.26 | a | 29.03 | a | 30.20 | 33.47 | a | 39.43 | 42.39 | 40.50 | a | 34.77 | 21.83 | a | 13.77 | 5.32 | c | 28.12 | |||||||
1979 | -2.61 | 18.50 | 23.23 | 31.43 | 34.94 | 34.97 | 40.23 | a | 43.17 | a | 33.97 | 29.50 | c | 18.50 | 21.10 | a | 27.24 | |||||||||
1980 | 13.24 | b | 25.96 | a | 24.73 | a | 30.57 | 35.43 | a | 38.55 | a | 41.13 | 33.48 | 31.79 | b | 25.04 | c | 25.10 | 20.86 | b | 28.82 | |||||
1981 | 22.20 | a | 19.89 | a | 24.14 | b | 30.27 | 35.03 | 39.03 | 37.29 | 37.32 | 30.67 | 26.37 | a | 24.59 | a | 21.61 | 29.03 | ||||||||
1982 | 13.46 | e | 12.69 | l | 23.08 | f | 23.07 | b | 28.73 | e | 41.83 | f | 41.48 | j | 38.71 | g | 34.24 | i | 28.75 | k | 19.84 | e | 16.35 | h | 21.28 | h |
1983 | 23.67 | m | 24.50 | j | 28.46 | e | 24.72 | e | 31.63 | d | 36.31 | d | 40.27 | e | 42.54 | c | 27.95 | j | 23.55 | k | 27.90 | j | 12.42 | g | 33.99 | f |
1984 | 11.93 | d | 16.97 | 25.55 | 28.57 | 32.17 | b | 38.31 | d | 38.17 | b | 38.57 | c | 30.48 | c | 24.14 | c | 24.50 | d | 7.79 | g | 28.12 | a | |||
1985 | 3.35 | e | 3.24 | c | 13.14 | c | 26.40 | e | 31.22 | d | 34.76 | a | 40.55 | 36.15 | e | 28.88 | d | 24.92 | f | 7.88 | e | 3.07 | d | 20.79 | a | |
1986 | 18.11 | c | 24.92 | c | 28.58 | e | 25.93 | b | 33.88 | e | 38.56 | c | 36.59 | d | 39.54 | c | 31.74 | c | 25.11 | c | 28.60 | e | 18.90 | b | 29.20 | |
1987 | 8.70 | d | 18.71 | d | 31.74 | l | 28.00 | k | 33.82 | c | 38.27 | 41.70 | a | 35.30 | a | 30.48 | a | 19.90 | b | 23.61 | b | 19.41 | b | 26.99 | b | |
1988 | 14.50 | c | 18.61 | a | 22.87 | 30.24 | a | 33.84 | 40.83 | 39.68 | 35.07 | a | 28.12 | d | 27.34 | b | 23.07 | a | 9.38 | b | 26.96 | |||||
1989 | 8.04 | e | 1.00 | d | 23.31 | b | 30.46 | d | 31.83 | g | 37.43 | 39.17 | a | 40.13 | a | 29.33 | c | 23.87 | a | 23.86 | b | 16.30 | a | 24.81 | a | |
1990 | 20.60 | a | 14.86 | 21.26 | 27.55 | a | 30.00 | b | 36.93 | 39.28 | b | 41.43 | c | 32.61 | b | 26.65 | e | 25.79 | a | 7.48 | b | 27.04 | ||||
1991 | 8.67 | d | 24.69 | b | 22.87 | 27.35 | d | 32.65 | h | ----- | z | ----- | z | 39.69 | e | ----- | z | ----- | z | ----- | z | 23.27 | a | 24.42 | f | |
1992 | ----- | z | 23.75 | e | 23.81 | d | ----- | z | ----- | z | 37.70 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.78 | j |
1993 | ----- | z | ----- | z | ----- | z | 29.03 | a | 39.03 | b | 40.50 | 38.55 | b | 38.23 | a | 27.13 | 26.87 | 10.36 | h | 20.05 | j | 34.19 | e | |||
1994 | 22.82 | c | 13.88 | c | 21.96 | e | 29.68 | b | 34.62 | g | 37.71 | i | 40.07 | d | 36.54 | g | 32.12 | e | 24.93 | c | 19.17 | g | 14.59 | d | 25.01 | d |
1995 | 22.77 | i | 24.65 | h | 24.26 | d | 26.35 | d | 33.73 | a | 38.14 | a | 41.96 | g | 35.70 | k | 35.43 | b | 26.07 | d | 25.68 | h | 21.79 | b | 29.40 | e |
1996 | 17.38 | b | 12.43 | f | 26.16 | l | 28.62 | a | 32.46 | c | 35.31 | a | 40.83 | a | 36.62 | g | 28.07 | c | 25.63 | d | 25.19 | c | 18.29 | c | 27.98 | c |
1997 | 16.12 | f | 21.43 | 28.50 | i | 30.39 | b | 34.25 | g | 37.85 | d | 40.38 | b | 42.50 | e | 37.04 | d | 26.39 | h | 26.24 | i | 17.62 | e | 32.46 | e | |
1998 | 19.86 | b | 23.40 | h | 27.35 | h | 28.62 | a | 36.62 | g | 38.17 | f | 44.56 | v | 37.77 | i | 38.45 | a | 25.29 | 26.64 | e | 15.00 | c | 25.64 | f | |
1999 | 22.04 | g | 17.47 | i | 23.52 | f | 24.50 | h | 29.70 | d | 37.31 | d | 36.39 | c | 41.71 | j | 25.96 | f | 22.79 | b | 27.60 | e | 21.43 | a | 29.21 | f |
2000 | 17.30 | a | 25.43 | f | 24.12 | f | 29.33 | c | 34.89 | c | 36.78 | c | 40.14 | b | 35.00 | j | 34.21 | f | 29.64 | c | 16.76 | e | 18.25 | g | 29.26 | e |
2001 | 15.46 | g | 18.88 | b | 23.56 | o | 28.25 | j | 27.20 | u | ----- | z | ----- | z | ----- | z | 39.58 | r | 28.48 | h | 29.94 | m | 24.18 | t | 18.88 | k |
2002 | 20.40 | u | 16.50 | r | 22.00 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.85 | r | ----- | z |
2003 | 24.81 | o | 14.80 | w | ----- | z | 31.88 | v | 35.22 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | 27.55 | s | 30.78 | v | 38.33 | o | 43.10 | j | 46.55 | i | 36.50 | p | ----- | z | 16.75 | v | 21.00 | y | ----- | z |
2005 | 18.13 | p | 10.82 | q | 24.36 | q | ----- | z | 35.71 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.11 | l | ----- | z |
2007 | 13.80 | f | 21.48 | e | 26.83 | b | 28.69 | d | 31.77 | e | 37.86 | w | 45.70 | h | 42.67 | y | ----- | z | 27.33 | d | 19.29 | w | 10.00 | x | 27.22 | g |
2008 | 12.00 | y | ----- | z | ----- | z | ----- | z | ----- | z | 32.40 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | 24.00 | w | 26.24 | i | 32.24 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | 28.50 | h | 31.71 | 38.83 | a | 38.70 | a | 35.81 | 35.87 | 30.16 | 26.61 | g | 19.29 | q | 35.18 | f | ||||
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 13.60 | 18.63 | 23.49 | 28.14 | 33.03 | 37.78 | 39.55 | 37.97 | 32.30 | 27.24 | 23.03 | 17.65 | 27.76 | |||||||||||||
S.D. | 8.02 | 6.45 | 2.87 | 2.01 | 2.18 | 2.21 | 1.90 | 2.83 | 3.30 | 3.28 | 4.94 | 5.83 | 1.64 | |||||||||||||
SKEW | -0.91 | -0.62 | -0.60 | -0.25 | 0.54 | -0.02 | 0.30 | 0.30 | 0.41 | 0.22 | -0.86 | -0.37 | -0.17 | |||||||||||||
MAX | 28.68 | 30.00 | 29.03 | 32.33 | 39.06 | 43.87 | 44.33 | 43.26 | 42.37 | 36.52 | 31.33 | 30.13 | 31.12 | |||||||||||||
MIN | -11.78 | 1.00 | 13.14 | 23.07 | 28.13 | 31.40 | 36.39 | 32.46 | 25.73 | 19.90 | 7.88 | 3.07 | 24.01 | |||||||||||||
YRS | 68 | 68 | 66 | 70 | 66 | 68 | 70 | 65 | 67 | 71 | 67 | 69 | 47 |