YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.42 | 54.47 | 41.77 | 53.22 | i | |||
1954 | 46.32 | 51.50 | 47.23 | a | 60.10 | 62.68 | 69.83 | 74.55 | 70.03 | 71.03 | 62.87 | 55.97 | 46.29 | 59.87 | ||||||||||||
1955 | 38.81 | 40.54 | 48.52 | 54.33 | 60.48 | 70.20 | 72.06 | 71.69 | b | 72.70 | 66.55 | 50.77 | 49.39 | 58.00 | ||||||||||||
1956 | 49.55 | 38.90 | 50.19 | 53.43 | 64.48 | 75.17 | 73.68 | 73.48 | 75.30 | 62.13 | 50.00 | 46.00 | 59.36 | |||||||||||||
1957 | 46.00 | 52.39 | 49.65 | 54.07 | 58.68 | 73.27 | 77.35 | 74.58 | 71.43 | 59.74 | 46.43 | 48.33 | a | 59.33 | ||||||||||||
1958 | 44.29 | 47.68 | 44.10 | 53.00 | 68.23 | 73.57 | 77.19 | 75.55 | 71.73 | 63.42 | 51.23 | 50.77 | 60.06 | |||||||||||||
1959 | 46.45 | 43.21 | 50.13 | 60.47 | 61.55 | 75.43 | 77.00 | 71.97 | 70.73 | 62.84 | 51.76 | a | 45.84 | 59.78 | ||||||||||||
1960 | 39.16 | 39.34 | 52.81 | 57.00 | 62.77 | 75.83 | 77.32 | 74.84 | 74.30 | 60.48 | 53.47 | 44.00 | 59.28 | |||||||||||||
1961 | 47.68 | 45.57 | 48.45 | 55.76 | a | 62.32 | 74.70 | 76.35 | 73.94 | 68.90 | 61.29 | 47.55 | a | 44.55 | 58.92 | |||||||||||
1962 | 40.20 | a | 45.86 | 43.97 | 60.57 | 60.55 | 69.67 | 75.68 | 78.10 | 72.50 | 63.10 | 55.83 | 48.52 | 59.54 | ||||||||||||
1963 | 40.90 | 50.14 | 48.26 | 52.50 | 65.90 | 67.63 | 77.77 | 71.32 | 72.77 | 65.97 | 51.50 | 46.26 | 59.24 | |||||||||||||
1964 | 40.35 | 39.17 | 44.81 | 52.43 | 61.58 | 69.57 | 76.61 | 72.81 | 68.80 | 65.55 | 48.47 | 45.77 | 57.16 | |||||||||||||
1965 | 45.70 | a | 43.04 | 46.42 | 53.40 | 59.70 | a | 65.37 | 76.03 | 74.74 | 67.93 | 65.42 | 57.17 | 45.29 | 58.35 | |||||||||||
1966 | 41.35 | 40.71 | 51.13 | 57.60 | 65.58 | 72.50 | 77.13 | 73.87 | 71.47 | 60.65 | 53.47 | 44.06 | 59.13 | |||||||||||||
1967 | 41.45 | 43.46 | 51.10 | 47.50 | 61.26 | 66.83 | 72.68 | 74.03 | 70.43 | 64.71 | 56.41 | a | 40.19 | 57.51 | ||||||||||||
1968 | 45.16 | 51.97 | 50.61 | 54.03 | 63.71 | 73.33 | 75.35 | 72.13 | 70.27 | 62.16 | 50.97 | 41.03 | a | 59.23 | ||||||||||||
1969 | 47.10 | a | 43.54 | 45.03 | 56.17 | 65.13 | 69.23 | 77.00 | 77.32 | 73.14 | a | 57.93 | a | 50.13 | 44.68 | 58.87 | ||||||||||
1970 | 41.23 | 47.00 | b | 45.90 | 49.14 | a | 64.55 | 73.73 | 77.10 | 75.10 | 70.62 | a | 59.10 | 51.93 | 42.63 | a | 58.17 | |||||||||
1971 | 43.30 | a | 44.32 | 50.03 | 52.50 | 54.19 | 68.30 | 78.32 | 71.61 | 71.27 | 55.58 | 50.97 | 40.93 | a | 56.78 | |||||||||||
1972 | 43.39 | 49.44 | b | 57.16 | 55.14 | a | 62.06 | 71.31 | a | 79.16 | 73.10 | 70.60 | 59.26 | 43.93 | 40.68 | 58.77 | ||||||||||
1973 | 39.90 | 43.25 | 40.58 | 51.07 | 63.65 | 70.70 | 74.03 | 75.26 | 67.03 | 57.07 | a | 48.73 | 40.84 | 56.01 | ||||||||||||
1974 | 40.26 | 39.07 | 42.06 | 44.17 | 58.29 | 74.13 | 74.87 | 74.03 | 69.30 | 62.26 | 51.70 | 39.23 | 55.78 | |||||||||||||
1975 | 36.03 | 41.96 | 42.87 | 44.37 | 54.19 | 68.77 | 72.74 | 73.94 | 71.03 | 58.30 | d | 49.07 | 44.87 | 54.84 | ||||||||||||
1976 | 38.53 | a | 44.72 | 45.19 | 46.63 | 61.65 | 70.43 | 73.52 | 72.71 | 67.83 | 54.74 | 49.10 | 40.10 | 55.43 | ||||||||||||
1977 | 39.45 | 45.57 | 42.06 | 53.34 | a | 56.23 | 72.90 | 76.81 | 74.42 | 69.80 | 61.65 | 49.10 | a | 42.42 | 56.98 | |||||||||||
1978 | 41.00 | a | 41.00 | 48.97 | 53.90 | 58.11 | c | 72.72 | a | 76.11 | c | 72.93 | c | 66.31 | d | 65.72 | b | 50.96 | d | 39.18 | c | 57.24 | ||||
1979 | 38.03 | b | 43.52 | a | 46.90 | b | 52.22 | c | 58.70 | a | 71.97 | a | 74.87 | 72.30 | a | 73.67 | 61.37 | a | 47.53 | 47.54 | e | 57.38 | ||||
1980 | 45.13 | 48.11 | a | 44.76 | f | 51.96 | g | 56.67 | j | 72.14 | h | ----- | z | 73.84 | f | 71.08 | e | 61.59 | b | 52.44 | l | 49.74 | l | 56.48 | h | |
1981 | 45.30 | h | 48.00 | d | 47.24 | f | 56.85 | c | 61.68 | 74.67 | 75.59 | b | 75.10 | a | 70.46 | b | 59.14 | c | 54.20 | e | 47.84 | f | 63.97 | c | ||
1982 | 41.48 | h | 45.00 | c | 46.47 | a | 54.33 | c | 59.59 | i | 67.88 | d | 72.78 | h | 74.39 | 68.92 | d | 58.19 | 50.04 | g | 41.33 | d | 57.07 | d | ||
1983 | 43.70 | d | 44.83 | d | 46.63 | a | 49.77 | 62.90 | a | 69.17 | 75.10 | 72.52 | 72.55 | a | 61.48 | 48.77 | 44.29 | 57.64 | ||||||||
1984 | 44.81 | 44.55 | 49.55 | b | 51.45 | a | 67.35 | 70.07 | 71.57 | a | 71.90 | a | 71.41 | a | 56.73 | a | 50.58 | f | 40.17 | a | 58.14 | a | ||||
1985 | 40.33 | a | 42.68 | f | 45.27 | a | 56.00 | d | 63.00 | 71.44 | c | 74.68 | 74.03 | 64.25 | b | 60.37 | d | 49.27 | 46.93 | a | 58.69 | a | ||||
1986 | 51.71 | 47.64 | 53.81 | 57.18 | b | 64.47 | a | 74.53 | 67.23 | 76.13 | 68.89 | c | 60.04 | c | 50.43 | b | 45.58 | 59.80 | ||||||||
1987 | 42.20 | a | 44.64 | 45.62 | b | 59.40 | 63.07 | a | 74.56 | c | 75.50 | a | 73.39 | 70.21 | a | 67.17 | a | 50.74 | c | 39.84 | 58.86 | |||||
1988 | 32.54 | c | 48.93 | b | 48.94 | 54.41 | c | 61.77 | 72.50 | 75.70 | a | 73.21 | b | 70.29 | b | 66.86 | b | 50.66 | a | 44.10 | 58.32 | |||||
1989 | 42.20 | a | 46.86 | 53.97 | a | 62.83 | 65.27 | a | 73.07 | 78.13 | a | 74.39 | c | 71.80 | 61.35 | 54.55 | a | 45.69 | b | 60.84 | ||||||
1990 | 42.87 | a | 41.77 | b | 50.20 | a | 57.62 | a | 62.58 | 75.14 | a | 74.77 | a | 72.16 | 70.97 | 64.26 | 53.07 | a | 42.87 | a | 59.02 | |||||
1991 | 43.47 | a | 51.00 | 42.70 | a | 53.63 | 60.97 | 68.40 | 76.10 | a | 76.00 | b | 70.90 | 65.27 | a | 49.70 | 44.77 | a | 58.58 | |||||||
1992 | 42.63 | a | 48.31 | 48.72 | b | 59.67 | 63.73 | a | 71.73 | 74.45 | b | 72.50 | a | 73.24 | a | 65.71 | 47.53 | 42.84 | 59.26 | |||||||
1993 | 45.90 | 44.85 | b | 49.48 | 57.10 | 65.37 | a | 72.67 | 75.13 | a | 77.72 | m | 70.19 | i | 63.13 | a | 49.52 | a | 45.52 | b | 56.87 | b | ||||
1994 | 46.10 | 44.22 | a | 51.62 | b | 57.52 | c | 62.87 | 77.04 | d | 77.39 | 78.52 | 72.48 | a | 60.50 | a | 45.66 | a | 46.03 | 60.00 | ||||||
1995 | 42.63 | a | 52.29 | 49.19 | 54.30 | j | 58.59 | b | 70.00 | a | 77.97 | a | 78.17 | a | 73.50 | 65.53 | a | 56.87 | 48.68 | 61.22 | a | |||||
1996 | 46.07 | a | 50.57 | a | 50.71 | 58.41 | a | 66.97 | 75.77 | 76.24 | b | ----- | z | 69.55 | s | 61.10 | 51.93 | a | 41.38 | e | 57.91 | b | ||||
1997 | 44.04 | d | 44.59 | a | 54.17 | a | 54.11 | b | 68.28 | b | 71.24 | a | 76.90 | a | 74.80 | a | 73.37 | ----- | z | 53.53 | 40.79 | b | 59.62 | a | ||
1998 | 44.60 | f | 38.80 | c | 44.57 | a | 47.86 | a | ----- | z | ----- | z | 75.08 | e | 74.86 | c | 69.77 | 58.39 | 48.28 | a | 42.62 | b | 55.58 | c | ||
1999 | 45.81 | 48.15 | a | 49.65 | 48.63 | 62.35 | 70.33 | 73.03 | a | 74.71 | 72.03 | 64.94 | 57.53 | 44.77 | 59.33 | |||||||||||
2000 | 46.83 | a | 47.75 | a | 48.14 | b | 58.48 | a | 67.13 | 73.53 | 77.81 | 75.24 | b | 74.77 | 60.06 | 43.45 | a | 47.37 | a | 60.05 | ||||||
2001 | 42.27 | a | 43.04 | 49.65 | 54.17 | 66.87 | 73.43 | 76.20 | a | 74.17 | a | 74.23 | 65.07 | c | 55.30 | 41.43 | a | 59.65 | ||||||||
2002 | 43.84 | 47.96 | 46.90 | b | 58.77 | 62.71 | 74.62 | a | 77.26 | 76.42 | 73.50 | 60.45 | 54.10 | a | 43.33 | a | 59.99 | |||||||||
2003 | 51.39 | 45.81 | b | 47.48 | b | 52.03 | 64.45 | 72.17 | 77.71 | 76.26 | 72.80 | 68.03 | 50.59 | a | 43.70 | a | 60.20 | |||||||||
2004 | 45.48 | 41.75 | i | 57.42 | 56.21 | b | 64.68 | c | 72.10 | a | 75.86 | c | 73.97 | a | 70.04 | e | 60.07 | d | 47.45 | a | 43.89 | d | 60.65 | a | ||
2005 | 46.09 | h | 46.96 | a | 48.22 | d | 55.33 | c | 65.40 | a | ----- | z | 78.73 | a | 73.54 | e | 74.37 | c | 63.87 | a | 55.22 | c | 48.61 | h | 62.41 | c |
2006 | 45.36 | i | 49.21 | d | 47.34 | b | 54.92 | d | 68.03 | a | 77.00 | 78.42 | 74.71 | ----- | z | ----- | z | ----- | z | ----- | z | 64.23 | e | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 43.20 | 45.50 | 48.25 | 54.34 | 62.73 | 72.00 | 75.76 | 74.14 | 71.13 | 61.97 | 51.14 | 43.98 | 58.56 | |||||||||||||
S.D. | 3.70 | 3.71 | 3.63 | 4.10 | 3.32 | 2.72 | 2.15 | 1.81 | 2.25 | 3.13 | 3.34 | 2.85 | 1.42 | |||||||||||||
SKEW | -0.15 | -0.02 | 0.28 | -0.48 | -0.57 | -0.25 | -1.38 | 0.37 | -0.59 | -0.14 | -0.03 | 0.22 | -0.89 | |||||||||||||
MAX | 51.71 | 52.39 | 57.42 | 62.83 | 68.28 | 77.04 | 79.16 | 78.52 | 75.30 | 68.03 | 57.53 | 50.77 | 60.84 | |||||||||||||
MIN | 32.54 | 38.80 | 40.58 | 44.17 | 54.19 | 65.37 | 67.23 | 70.03 | 64.25 | 54.74 | 43.45 | 39.18 | 54.84 | |||||||||||||
YRS | 48 | 51 | 51 | 51 | 50 | 50 | 51 | 50 | 50 | 52 | 50 | 50 | 40 |