YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.05 | k | 41.79 | 26.33 | ----- | z | 34.06 | j | ||
1920 | ----- | z | ----- | z | 26.91 | c | 33.60 | e | 55.10 | e | 63.39 | c | 66.86 | q | 64.54 | g | 61.48 | b | 55.16 | o | ----- | z | ----- | z | 48.10 | g |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | 56.85 | a | 68.23 | d | 75.19 | b | 65.84 | b | 60.95 | a | 47.43 | a | ----- | z | 20.00 | f | 62.42 | f |
1922 | 9.98 | e | 7.19 | a | 27.02 | c | 40.95 | 61.79 | 64.54 | b | 64.42 | e | 68.74 | 60.72 | a | ----- | z | 37.77 | f | 14.75 | c | 42.01 | b | |||
1923 | 12.59 | c | ----- | z | 17.46 | c | 40.11 | b | 54.97 | 68.13 | c | 70.72 | b | 61.89 | c | 60.34 | e | 45.54 | e | 35.58 | d | 24.89 | i | 46.73 | b | |
1924 | 0.28 | f | 18.45 | 25.19 | 39.92 | 46.98 | b | 59.97 | a | 65.45 | 63.37 | 53.66 | a | 52.27 | 28.31 | a | 3.78 | b | 41.58 | a | ||||||
1925 | 8.30 | c | 15.34 | c | 30.00 | b | 47.84 | b | 52.71 | b | 64.88 | a | 67.95 | a | 69.73 | 60.17 | a | 36.60 | 31.00 | e | 12.74 | 41.44 | ||||
1926 | 12.48 | c | 16.41 | f | 20.73 | c | 40.55 | 57.69 | b | 59.29 | a | 67.42 | 65.43 | b | 56.41 | c | 45.40 | a | 26.67 | 12.38 | a | 42.22 | a | |||
1927 | 7.74 | 18.44 | c | 33.45 | b | 43.98 | b | 52.00 | b | 61.82 | 65.37 | 60.65 | 61.07 | a | 46.97 | 27.93 | 4.88 | c | 40.36 | |||||||
1928 | 12.98 | a | 16.12 | 26.28 | a | 37.24 | a | 56.40 | b | 59.48 | 68.23 | 67.15 | 54.85 | 47.34 | 33.97 | a | 19.02 | b | 41.59 | |||||||
1929 | -2.90 | 4.26 | c | 29.37 | 44.41 | a | 51.65 | 62.37 | 69.84 | 66.61 | 55.30 | 46.00 | 26.03 | a | 15.15 | a | 39.01 | |||||||||
1930 | 2.71 | b | 22.15 | a | 28.73 | 45.79 | b | 56.02 | a | 65.13 | c | 69.92 | 70.07 | b | 57.44 | d | 46.16 | 33.58 | 19.11 | 43.07 | ||||||
1931 | 21.40 | 26.81 | a | 29.58 | a | 44.20 | c | 53.38 | b | 68.83 | a | 71.87 | d | 66.24 | 63.47 | 51.60 | 37.69 | d | 27.94 | 46.92 | ||||||
1932 | 18.02 | b | 15.40 | 18.25 | a | 41.70 | 55.34 | 68.35 | 71.11 | 68.94 | 56.60 | 43.44 | 27.14 | a | 12.36 | b | 41.39 | |||||||||
1933 | 19.33 | a | 5.48 | a | 25.87 | 40.28 | 57.23 | 73.13 | 73.26 | 67.09 | b | 64.37 | 42.84 | 27.05 | b | 10.48 | 42.20 | |||||||||
1934 | 17.85 | 11.73 | 23.05 | c | 40.53 | 61.55 | a | 66.72 | 70.40 | 64.52 | 54.05 | 47.67 | a | 34.53 | a | 7.33 | e | 41.66 | ||||||||
1935 | 4.82 | c | 21.13 | a | 26.15 | a | 37.55 | a | 50.24 | b | ----- | z | 74.72 | b | 66.72 | a | 55.83 | 43.83 | a | 24.65 | f | 14.92 | a | 39.59 | b | |
1936 | 3.03 | a | -3.29 | a | 25.35 | a | 35.27 | 57.42 | 61.48 | a | 72.69 | g | 67.88 | a | 60.83 | a | 41.05 | 25.52 | a | 16.44 | 35.54 | a | ||||
1937 | 1.66 | b | 11.80 | 22.11 | 39.79 | a | 55.00 | 62.25 | 67.90 | b | 70.69 | 56.02 | a | 41.00 | a | 29.02 | a | 12.06 | 39.11 | |||||||
1938 | 7.63 | a | 17.37 | b | 34.02 | a | 41.62 | 50.40 | 61.85 | 66.42 | 66.89 | 55.87 | c | 50.58 | 29.73 | b | 15.65 | 41.50 | ||||||||
1939 | 14.45 | 4.39 | 23.98 | 37.67 | a | 58.61 | 64.40 | 71.03 | b | 67.13 | 58.90 | a | 45.45 | 33.21 | a | 25.61 | 42.07 | |||||||||
1940 | 6.24 | f | 16.12 | a | 20.31 | 38.02 | b | 51.45 | 61.90 | 69.68 | 65.53 | 62.57 | 50.03 | b | 25.62 | b | 19.13 | 43.67 | a | |||||||
1941 | 12.98 | 13.41 | 23.52 | a | 48.74 | a | 59.56 | 64.88 | 71.32 | 66.90 | a | 60.41 | a | 48.72 | b | ----- | z | ----- | z | 47.05 | b | |||||
1942 | ----- | z | 24.00 | x | 33.06 | e | 49.24 | e | 51.38 | g | 64.66 | b | 67.06 | 66.55 | 54.68 | 45.89 | 29.12 | 11.07 | a | 46.81 | c | |||||
1943 | 5.25 | c | 14.56 | c | 17.86 | b | 39.78 | 53.03 | a | 65.68 | 72.27 | 67.90 | a | 54.47 | 46.87 | 27.57 | a | 19.60 | b | 40.40 | ||||||
1944 | 23.62 | c | 16.94 | e | 26.60 | f | 39.88 | 59.52 | c | 64.54 | d | 68.00 | c | 68.57 | a | 58.08 | 45.83 | a | 36.63 | g | 15.27 | g | 49.44 | c | ||
1945 | 8.32 | a | 14.27 | b | 34.35 | a | 40.31 | d | 48.36 | f | 59.30 | c | 66.41 | d | 66.40 | b | 57.09 | c | 43.69 | g | 29.07 | i | 10.10 | f | 43.30 | d |
1946 | 13.48 | f | 10.00 | e | 40.46 | e | 46.63 | d | 52.09 | d | 62.84 | a | 69.88 | e | 64.96 | h | 58.69 | f | 48.30 | f | 32.30 | e | 17.45 | j | 44.89 | e |
1947 | 18.95 | k | 13.35 | d | 26.60 | b | 38.67 | d | 51.44 | d | 62.22 | c | 70.21 | 75.65 | d | 59.91 | c | 57.53 | b | 26.10 | d | 16.87 | d | 45.32 | a | |
1948 | 2.97 | l | 12.29 | c | 24.07 | d | 48.17 | c | 55.76 | f | 63.91 | b | 71.03 | 68.40 | 62.45 | b | 47.84 | 34.18 | b | 15.05 | 44.74 | b | ||||
1949 | 12.06 | d | 11.61 | 25.58 | a | 44.38 | a | 57.92 | 68.18 | b | 72.15 | a | 69.79 | 56.46 | b | 50.20 | a | 34.37 | 16.70 | a | 43.28 | |||||
1950 | 3.23 | a | 13.16 | c | 19.84 | 34.57 | 51.81 | b | 64.72 | ----- | z | 61.98 | 57.64 | a | 49.34 | 24.44 | f | 6.80 | f | 39.59 | c | |||||
1951 | 6.67 | a | 18.67 | g | 20.48 | 40.50 | 57.81 | 59.10 | 66.79 | 62.27 | 53.60 | 45.48 | 22.47 | a | 13.76 | 40.81 | a | |||||||||
1952 | 8.55 | 19.80 | a | 22.73 | 45.78 | c | 52.85 | 65.43 | 68.83 | a | 64.12 | a | 58.02 | c | 39.18 | 31.76 | a | 21.38 | a | 41.54 | ||||||
1953 | 11.46 | c | 11.57 | 27.63 | a | 38.22 | a | 53.15 | 65.85 | 66.32 | 67.65 | 57.28 | 51.87 | 33.72 | a | 16.98 | 41.81 | |||||||||
1954 | 4.29 | 24.86 | 23.76 | 41.40 | 47.48 | 65.62 | a | 67.79 | 63.23 | 55.65 | 42.95 | 33.29 | a | 19.15 | 40.79 | |||||||||||
1955 | 8.02 | 9.04 | 20.55 | 48.63 | 57.68 | 63.32 | 72.63 | 69.34 | 56.93 | 46.58 | 23.32 | 7.76 | 40.32 | |||||||||||||
1956 | 11.16 | 9.83 | 21.74 | 38.00 | 52.34 | 65.85 | 63.23 | 64.26 | 54.59 | a | 51.39 | 30.10 | 17.11 | 39.97 | ||||||||||||
1957 | 2.90 | 13.50 | 23.81 | 41.43 | 52.10 | 61.05 | a | 70.56 | 65.74 | 54.23 | 40.13 | p | 30.83 | 19.95 | 39.65 | a | ||||||||||
1958 | 16.73 | 10.41 | 28.35 | 43.13 | 53.29 | 56.97 | 64.74 | 63.95 | 58.28 | a | 47.10 | a | 32.87 | 10.47 | 40.52 | |||||||||||
1959 | 5.73 | 12.98 | 30.19 | 43.12 | 57.74 | 66.20 | 69.35 | 70.61 | 59.08 | 42.58 | 21.88 | 25.84 | 42.11 | |||||||||||||
1960 | 13.26 | 15.36 | 19.05 | 43.40 | 54.61 | 61.33 | 68.55 | 69.34 | 59.18 | 47.21 | 33.67 | 14.74 | 41.64 | |||||||||||||
1961 | 10.37 | 22.50 | 33.76 | 38.65 | 52.66 | 64.90 | 67.66 | 69.98 | 58.23 | 48.08 | 31.07 | 15.35 | 42.77 | |||||||||||||
1962 | 6.87 | 12.57 | 29.05 | 40.38 | 59.32 | 62.75 | 65.37 | 66.32 | 55.72 | 49.02 | 34.60 | 17.45 | 41.62 | |||||||||||||
1963 | 2.47 | a | 10.16 | 31.66 | 45.70 | 53.97 | 65.98 | 70.76 | 65.21 | 59.62 | 56.02 | 36.32 | 9.00 | 42.24 | ||||||||||||
1964 | 18.82 | 18.38 | 24.35 | 44.62 | 59.21 | 64.52 | 71.77 | 63.89 | 56.55 | 46.53 | 32.28 | 10.05 | 42.58 | |||||||||||||
1965 | 6.53 | 9.18 | 18.37 | 41.23 | 57.26 | 61.83 | 65.80 | a | 64.77 | 50.65 | 47.71 | 30.27 | 23.10 | 39.73 | ||||||||||||
1966 | 0.24 | 13.11 | 31.89 | 39.37 | 50.33 | a | 65.23 | 71.90 | 63.63 | 56.58 | 45.06 | 27.82 | 15.48 | 40.05 | ||||||||||||
1967 | 13.10 | 7.57 | 27.50 | 42.13 | 49.27 | 62.50 | 65.98 | 62.60 | 56.63 | 44.03 | 28.18 | 17.45 | 39.75 | |||||||||||||
1968 | 10.40 | 10.83 | 35.48 | 45.25 | 51.60 | 61.96 | b | 66.92 | 66.18 | 57.43 | 48.98 | 30.79 | a | 14.06 | 41.66 | |||||||||||
1969 | 8.23 | 16.59 | 22.73 | 44.62 | 56.13 | 56.07 | a | 66.92 | 69.98 | 58.50 | 42.85 | 29.71 | a | 19.19 | 40.96 | |||||||||||
1970 | 4.55 | 12.84 | 22.42 | 41.84 | a | 53.52 | 65.71 | b | 70.60 | 67.05 | 57.18 | 46.50 | 29.13 | 15.02 | 40.53 | |||||||||||
1971 | 3.76 | 14.04 | 24.24 | 43.09 | a | 51.82 | 66.78 | 64.05 | a | 63.27 | 58.45 | 50.95 | 30.58 | 16.02 | 40.59 | |||||||||||
1972 | 2.76 | 7.57 | 22.89 | 38.12 | 58.55 | 62.24 | a | 65.42 | 65.23 | 54.25 | 41.66 | 30.42 | 9.95 | 38.25 | ||||||||||||
1973 | 13.18 | 16.95 | 36.95 | 42.57 | a | 51.69 | 63.78 | 67.58 | 68.71 | 55.80 | 51.16 | 31.85 | 14.69 | 42.91 | ||||||||||||
1974 | 9.19 | 14.80 | 26.97 | 43.90 | 51.69 | 60.87 | 71.24 | 63.34 | 51.80 | 46.31 | 32.85 | 21.69 | 41.22 | |||||||||||||
1975 | 12.08 | 16.02 | 21.10 | 36.47 | 57.77 | a | 62.70 | 70.61 | 66.32 | 53.45 | 48.39 | 32.38 | a | 14.15 | 40.95 | |||||||||||
1976 | 7.23 | 23.34 | 26.48 | 46.02 | a | 53.82 | 66.25 | 69.76 | 67.66 | 56.88 | 39.81 | 22.95 | 5.95 | 40.51 | ||||||||||||
1977 | -0.92 | 17.72 | a | 35.00 | 48.48 | 63.24 | 63.73 | 70.15 | 61.13 | a | 57.25 | 45.40 | 30.07 | 13.63 | 42.07 | |||||||||||
1978 | 5.13 | 9.55 | 27.71 | 42.22 | 57.74 | 62.62 | a | 66.92 | 66.81 | 61.12 | 46.37 | 27.77 | 10.16 | 40.34 | ||||||||||||
1979 | -0.50 | 8.02 | 26.66 | 39.28 | 50.34 | 61.97 | 67.69 | 64.32 | 59.20 | b | 43.40 | 29.87 | 21.82 | 39.34 | ||||||||||||
1980 | 10.87 | ----- | z | 23.21 | 45.82 | 58.89 | 62.90 | 70.02 | 66.79 | 55.77 | 42.06 | 32.33 | 15.52 | 44.02 | a | |||||||||||
1981 | 14.76 | 20.80 | 32.97 | 45.17 | 53.29 | 62.87 | 68.15 | 66.71 | 55.83 | a | 43.97 | 36.33 | 16.47 | 43.11 | ||||||||||||
1982 | 0.30 | a | 12.72 | a | 25.34 | 40.55 | 58.61 | 58.70 | 69.89 | 64.90 | 56.95 | 47.85 | 28.02 | b | 22.15 | 40.50 | ||||||||||
1983 | 16.32 | 24.75 | 31.06 | 39.43 | 50.89 | 63.85 | 72.05 | a | 71.02 | 59.68 | 46.30 | a | 32.18 | 2.84 | 42.53 | |||||||||||
1984 | 10.77 | 26.81 | 23.73 | 45.15 | 53.39 | 65.62 | 67.98 | 70.26 | 54.12 | 49.52 | c | 31.35 | 17.06 | 42.98 | ||||||||||||
1985 | 9.50 | b | 13.77 | 34.11 | 47.25 | 58.47 | 60.43 | 67.31 | 63.06 | 56.85 | 45.61 | 23.28 | 5.47 | 40.43 | ||||||||||||
1986 | 15.27 | 14.21 | 31.98 | 48.31 | a | 57.80 | a | 64.75 | 69.95 | 63.48 | 56.97 | a | 46.07 | a | 26.14 | a | 19.37 | 42.86 | ||||||||
1987 | 15.69 | b | 26.12 | 34.47 | 47.68 | b | 56.56 | 66.25 | 71.26 | 65.48 | a | 57.76 | a | 39.61 | 34.70 | 21.87 | a | 44.79 | ||||||||
1988 | 4.77 | c | 7.55 | a | 28.56 | 42.95 | 60.61 | 67.60 | 72.82 | 68.98 | 58.03 | 40.48 | b | 31.33 | a | 15.05 | 41.56 | |||||||||
1989 | 15.48 | 4.68 | 21.17 | b | 40.33 | 54.45 | 62.27 | 70.81 | 67.02 | 57.57 | 47.42 | a | 25.97 | 5.89 | 39.42 | |||||||||||
1990 | 21.40 | 17.26 | a | 31.63 | 44.15 | 51.65 | 65.17 | 67.13 | 66.53 | 59.18 | 43.97 | 34.72 | 14.82 | 43.13 | ||||||||||||
1991 | 8.63 | a | 20.12 | 30.65 | 46.33 | 59.05 | 66.90 | 67.26 | 68.28 | a | 55.06 | d | 43.71 | 24.09 | c | 20.04 | f | 44.55 | a | |||||||
1992 | 17.44 | 23.79 | 29.90 | 39.85 | 57.89 | 61.28 | 61.87 | 63.23 | c | 56.57 | 44.82 | a | 29.78 | 21.83 | e | 42.35 | ||||||||||
1993 | 11.03 | 16.09 | 28.19 | 40.47 | 53.95 | 60.67 | 67.44 | 67.48 | 50.95 | b | 43.02 | 27.38 | 18.40 | 40.42 | ||||||||||||
1994 | -0.44 | 8.98 | 31.32 | 42.10 | 56.44 | 65.30 | 66.52 | 64.16 | 60.75 | 49.56 | 35.33 | 20.75 | a | 41.73 | ||||||||||||
1995 | 13.53 | 14.48 | a | 30.65 | 37.27 | 53.79 | 67.77 | 68.40 | 69.68 | 56.12 | 45.76 | 23.32 | 13.27 | 41.17 | ||||||||||||
1996 | 3.32 | 12.62 | 21.40 | a | 38.10 | 52.24 | 64.03 | 65.58 | a | 67.46 | d | 58.80 | 46.65 | 23.73 | 12.82 | 38.90 | ||||||||||
1997 | 7.79 | 18.54 | 27.69 | 41.82 | 49.87 | 66.09 | c | 67.37 | 63.69 | 60.22 | 47.39 | 28.25 | 25.50 | 42.02 | ||||||||||||
1998 | 17.06 | 31.09 | 30.57 | a | 47.45 | 61.06 | 62.22 | 68.95 | 68.87 | 63.22 | 49.85 | 35.36 | a | 20.90 | 46.38 | |||||||||||
1999 | 8.95 | 24.34 | 32.35 | 45.17 | 58.48 | 63.98 | 71.65 | 66.48 | 62.00 | p | 45.42 | 39.02 | 21.38 | a | 43.38 | a | ||||||||||
2000 | 11.98 | 22.57 | a | 36.60 | 41.85 | 57.00 | 61.07 | 67.94 | 67.53 | a | 56.43 | a | 49.52 | 31.75 | 5.05 | 42.44 | ||||||||||
2001 | 17.62 | a | 8.98 | 26.45 | 44.33 | 56.94 | 64.55 | 69.57 | a | 69.94 | 57.00 | 45.60 | 42.43 | 25.11 | 44.04 | |||||||||||
2002 | 20.19 | 25.13 | a | 20.60 | 40.98 | 50.02 | 65.78 | 71.45 | 66.77 | 56.19 | n | 39.50 | 30.05 | 22.65 | 41.19 | a | ||||||||||
2003 | 10.90 | 11.00 | r | 37.67 | v | 43.72 | g | 53.81 | 62.47 | 67.84 | 69.74 | 59.17 | 46.53 | 29.83 | 21.48 | 46.86 | c | |||||||||
2004 | 6.56 | 17.90 | 31.40 | 43.58 | 52.32 | 59.69 | a | 66.35 | 61.02 | 63.25 | 47.68 | 34.80 | 17.18 | 41.81 | ||||||||||||
2005 | 9.32 | 22.04 | 26.63 | 47.17 | 52.16 | 67.83 | 70.66 | 67.29 | 62.48 | 47.32 | a | 34.05 | a | 18.26 | 43.77 | |||||||||||
2006 | 25.27 | 14.46 | 31.34 | 48.70 | 56.79 | 64.67 | 73.65 | 67.81 | 55.85 | 42.06 | 33.60 | 25.08 | 44.94 | |||||||||||||
2007 | 16.27 | 8.67 | a | 33.35 | 42.08 | 59.24 | 67.48 | 70.10 | 67.12 | a | 60.13 | 50.08 | 32.17 | a | 12.97 | 43.31 | ||||||||||
2008 | 9.66 | 11.03 | 24.21 | 39.88 | a | 51.02 | 62.20 | 68.08 | a | 66.03 | 58.38 | a | 45.47 | a | 31.67 | a | 9.53 | b | 39.76 | |||||||
2009 | 0.42 | a | 16.91 | 27.77 | 42.98 | 54.19 | 62.65 | 63.37 | 64.25 | a | 62.63 | 40.20 | a | 38.57 | 13.93 | a | 40.66 | |||||||||
2010 | 8.78 | a | 17.22 | a | 37.34 | b | 49.38 | a | 56.37 | 63.15 | ----- | z | 70.47 | 55.13 | 49.20 | a | 36.06 | e | 16.30 | c | 41.77 | a | ||||
2011 | 12.03 | 20.18 | c | 27.31 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.11 | j | |
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 |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 9.90 | 15.02 | 27.27 | 42.42 | 54.94 | 63.78 | 68.81 | 66.54 | 57.67 | 46.21 | 30.63 | 15.77 | 41.60 | |||||||||||||
S.D. | 6.12 | 6.13 | 5.15 | 3.65 | 3.48 | 2.82 | 2.67 | 2.70 | 2.85 | 3.66 | 4.14 | 5.57 | 1.67 | |||||||||||||
SKEW | 0.19 | 0.09 | 0.16 | 0.03 | 0.08 | 0.06 | -0.08 | 0.15 | 0.11 | 0.12 | 0.02 | -0.21 | 0.75 | |||||||||||||
MAX | 25.27 | 31.09 | 40.46 | 49.38 | 63.24 | 73.13 | 75.19 | 75.65 | 64.37 | 57.53 | 42.43 | 27.94 | 46.92 | |||||||||||||
MIN | -2.90 | -3.29 | 17.46 | 33.60 | 46.98 | 56.07 | 61.87 | 60.65 | 50.65 | 36.60 | 21.88 | 2.84 | 38.25 | |||||||||||||
YRS | 84 | 84 | 88 | 89 | 88 | 90 | 87 | 89 | 88 | 87 | 84 | 82 | 66 |