| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1914 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.37 | l | 67.95 | 61.92 | 52.81 | 47.30 | 36.62 | a | 53.32 | |||||
| 1924 | 38.74 | h | 46.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.78 | v | ----- | z | ----- | z | 46.00 | ||
| 1925 | 40.86 | b | 46.95 | 48.32 | 52.95 | 59.71 | 62.20 | 69.06 | 65.82 | a | 60.62 | 54.00 | 45.67 | 42.08 | 54.02 | |||||||||||
| 1926 | 40.66 | 47.25 | 52.76 | 58.78 | 56.42 | a | 65.98 | 74.95 | 72.30 | a | 58.63 | 55.15 | 48.50 | 40.44 | n | 57.40 | ||||||||||
| 1927 | 40.00 | p | 43.20 | h | 45.06 | 49.02 | 54.00 | c | 62.04 | e | ----- | z | 68.43 | c | 59.83 | c | 54.98 | a | 47.30 | b | 31.92 | e | 52.51 | |||
| 1928 | 34.85 | ----- | z | ----- | z | 50.08 | d | 58.81 | 59.04 | d | 67.55 | 65.97 | a | 61.19 | a | 52.29 | 48.10 | y | 35.68 | i | 56.22 | |||||
| 1929 | 34.34 | b | 38.02 | a | 45.59 | d | 43.96 | g | 53.55 | i | 56.46 | f | 65.65 | 66.68 | 60.55 | 55.57 | c | 43.53 | 40.95 | j | 51.24 | |||||
| 1930 | 31.68 | 44.59 | ----- | z | 55.32 | e | 54.10 | e | 58.69 | f | 64.72 | a | 67.74 | 61.90 | d | 51.30 | d | 43.10 | 38.58 | a | 51.30 | |||||
| 1931 | 40.26 | 43.73 | 46.87 | 54.75 | 59.87 | 60.75 | 67.50 | 66.68 | 60.05 | 53.18 | 42.13 | 36.31 | 52.67 | |||||||||||||
| 1932 | 36.00 | 35.52 | 46.65 | a | 51.60 | 55.73 | 62.40 | 64.00 | 65.34 | 62.63 | 55.19 | 44.89 | b | 34.13 | a | 51.17 | ||||||||||
| 1933 | 34.35 | a | 36.21 | 45.18 | 50.91 | a | 54.94 | e | 60.68 | 66.95 | 68.82 | 57.87 | 56.87 | 45.17 | 42.92 | 51.74 | ||||||||||
| 1934 | 42.95 | 46.43 | 53.97 | b | 57.02 | 59.16 | 60.98 | 65.40 | 68.63 | 61.93 | 55.18 | 47.29 | a | 41.41 | d | 55.03 | ||||||||||
| 1935 | 36.05 | 43.46 | 42.94 | 50.47 | 55.63 | 63.53 | 66.79 | 66.61 | h | 65.90 | 53.32 | 42.13 | 39.02 | 50.84 | ||||||||||||
| 1936 | 41.26 | 40.14 | 45.39 | 54.03 | 58.36 | i | 63.41 | a | 67.29 | 68.45 | 62.05 | 58.10 | a | 47.07 | 41.53 | b | 53.52 | |||||||||
| 1937 | 29.02 | 38.48 | 48.12 | g | 49.87 | c | 57.21 | c | 62.54 | g | 66.11 | m | 65.82 | f | 62.89 | c | 57.24 | h | 48.08 | 42.65 | 46.89 | |||||
| 1938 | 40.60 | 41.82 | 44.35 | 51.53 | a | 57.90 | f | 64.09 | a | 70.89 | c | 65.74 | l | 67.25 | d | 55.48 | a | 42.90 | 40.00 | 51.89 | ||||||
| 1939 | 40.24 | 39.64 | 48.37 | a | 55.00 | f | 58.60 | 59.92 | 70.03 | 71.08 | 64.83 | 55.18 | 47.77 | 43.82 | 54.50 | |||||||||||
| 1940 | 42.10 | 44.52 | 50.21 | 53.18 | 59.47 | 65.08 | 67.71 | 69.81 | 63.38 | b | ----- | z | 44.71 | a | 41.85 | 54.73 | ||||||||||
| 1941 | 42.07 | a | ----- | z | 54.02 | f | 53.29 | d | 59.52 | c | 61.98 | a | 68.60 | a | 67.53 | 61.43 | i | 52.98 | h | 41.81 | l | 39.33 | a | 56.05 | ||
| 1942 | 37.81 | b | 40.64 | 45.10 | 51.93 | 54.68 | a | 59.70 | b | 69.92 | 71.00 | 65.33 | 57.05 | 45.38 | 41.24 | 53.32 | ||||||||||
| 1943 | 36.97 | 45.66 | 47.14 | b | 54.22 | 55.13 | 59.37 | 68.40 | 67.06 | 68.45 | 55.05 | 47.68 | 41.13 | 53.85 | ||||||||||||
| 1944 | 40.27 | 42.19 | 46.44 | 49.54 | b | 56.55 | 61.10 | 68.34 | 68.11 | 66.87 | 59.76 | 44.85 | 41.97 | 53.83 | ||||||||||||
| 1945 | 42.16 | 43.98 | 44.00 | 49.23 | 57.90 | 63.10 | 70.95 | 70.85 | 64.35 | 56.65 | 43.63 | 41.48 | 54.02 | |||||||||||||
| 1946 | 39.95 | 42.05 | 46.50 | 52.27 | 59.79 | 61.32 | 68.11 | 67.84 | 61.73 | 51.37 | 43.35 | 41.16 | 52.95 | |||||||||||||
| 1947 | 36.47 | 47.34 | 50.18 | 54.35 | 57.74 | 60.03 | 65.74 | 64.58 | 63.05 | 55.53 | 44.48 | 40.10 | 53.30 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.33 | a | 66.15 | 66.16 | k | 52.72 | m | 42.33 | 35.52 | e | 52.33 | |||
| 1949 | 30.68 | 37.36 | 44.98 | a | 54.85 | m | 58.30 | k | 63.65 | j | 67.97 | 68.00 | 65.39 | h | 50.42 | a | 48.92 | 38.88 | k | 49.76 | ||||||
| 1950 | 33.16 | f | 40.43 | g | 44.59 | c | 51.92 | f | 55.67 | e | 62.12 | e | 67.14 | b | 70.29 | c | ----- | z | 57.87 | h | 46.88 | i | 45.10 | k | 59.96 | |
| 1951 | 37.64 | f | 42.57 | f | 42.13 | d | 57.53 | j | ----- | z | 67.30 | j | 72.76 | j | 69.02 | 66.74 | e | 58.10 | z | ----- | z | ----- | z | 59.30 | ||
| 1952 | ----- | z | ----- | z | 43.88 | j | 54.60 | o | 65.54 | r | ----- | z | ----- | z | ----- | z | 65.68 | e | 58.34 | o | 40.93 | p | 33.44 | o | 65.68 | |
| 1953 | 39.56 | n | 43.59 | l | 44.41 | d | 49.64 | e | 50.12 | b | 57.48 | c | 68.27 | a | 67.21 | 66.38 | d | 56.27 | i | 48.93 | w | ----- | z | 57.64 | ||
| 1954 | 38.70 | i | 42.28 | j | 44.74 | n | 50.94 | l | 56.97 | n | 59.20 | j | 66.22 | h | 63.41 | c | 61.19 | f | 53.57 | p | 50.30 | t | 38.96 | q | 63.41 | |
| 1955 | 38.10 | j | 39.93 | 42.29 | 45.03 | 53.28 | a | 61.27 | 64.35 | 65.26 | 60.93 | 54.45 | 43.02 | 40.16 | 51.82 | |||||||||||
| 1956 | 39.20 | a | 37.71 | 43.65 | 52.50 | 58.21 | 59.83 | 68.73 | 66.63 | a | 62.77 | 51.58 | 44.55 | 40.08 | 52.12 | |||||||||||
| 1957 | 33.84 | 44.57 | 46.40 | 52.32 | 58.84 | 63.52 | 65.29 | 63.58 | 65.85 | 52.31 | 42.12 | 40.82 | 52.45 | |||||||||||||
| 1958 | 41.35 | 48.18 | 43.73 | 49.67 | 61.65 | 65.23 | 71.85 | 71.00 | 62.92 | 56.21 | 47.45 | 44.79 | 55.34 | |||||||||||||
| 1959 | 41.98 | 41.86 | 46.74 | 53.30 | 54.95 | 63.12 | 68.82 | 65.69 | 60.92 | 55.24 | 45.33 | 40.31 | 53.19 | |||||||||||||
| 1960 | 38.03 | 42.07 | 47.35 | 50.92 | 54.47 | 63.17 | 69.34 | 65.03 | 63.43 | 55.39 | 44.73 | 39.85 | 52.82 | |||||||||||||
| 1961 | 43.08 | 45.09 | 45.06 | 51.15 | 56.00 | 66.37 | 68.52 | 70.89 | 59.75 | 52.87 | 41.72 | 39.06 | 53.30 | |||||||||||||
| 1962 | 36.74 | 41.86 | 44.00 | 53.93 | 53.13 | 61.23 | 66.60 | 66.63 | 64.45 | 54.29 | 47.47 | 42.02 | 52.70 | |||||||||||||
| 1963 | 35.73 | 48.12 | 45.45 | 46.95 | 56.26 | 59.67 | 62.42 | 66.21 | 66.35 | 54.15 | 44.78 | 40.37 | 52.20 | |||||||||||||
| 1964 | 38.26 | 40.79 | 41.79 | 46.62 | 52.61 | 59.28 | 65.58 | 64.69 | 59.22 | 55.74 | 41.70 | 38.56 | 50.40 | |||||||||||||
| 1965 | 38.55 | 42.41 | 45.84 | 51.10 | 52.40 | 59.50 | 68.34 | 67.65 | 58.78 | 55.98 | 46.52 | 36.90 | 52.00 | |||||||||||||
| 1966 | 37.52 | 39.82 | 43.85 | 51.95 | 55.92 | 61.42 | 63.98 | 65.53 | 62.63 | 52.82 | 45.18 | 40.21 | 51.74 | |||||||||||||
| 1967 | 39.82 | 41.89 | 42.03 | 45.13 | 54.98 | 63.20 | 67.92 | 71.11 | 65.53 | 51.84 | 47.35 | 37.03 | 52.32 | |||||||||||||
| 1968 | 37.76 | 46.95 | 47.55 | 48.13 | 54.94 | 61.53 | 67.35 | 65.08 | 61.63 | 51.26 | 43.93 | 36.79 | 51.91 | |||||||||||||
| 1969 | 34.66 | 37.93 | 44.73 | 49.17 | 58.71 | 63.37 | 65.00 | 64.00 | 61.52 | 49.35 | a | 45.08 | 40.21 | 51.14 | ||||||||||||
| 1970 | 39.97 | 43.82 | 45.05 | 44.67 | 54.82 | 64.67 | 67.23 | 65.74 | 56.92 | 50.77 | 44.73 | 36.90 | 51.27 | |||||||||||||
| 1971 | 36.50 | 40.02 | 40.27 | 46.87 | 54.60 | 57.65 | 67.23 | 68.52 | 58.25 | 49.26 | 42.10 | 36.31 | 49.80 | |||||||||||||
| 1972 | 35.84 | 41.47 | 46.66 | 46.20 | 56.06 | 61.47 | a | 68.21 | 67.98 | 58.97 | 51.74 | 44.52 | 33.74 | 51.07 | ||||||||||||
| 1973 | 36.29 | 44.82 | 42.92 | 49.73 | 57.81 | 61.50 | 67.06 | 64.52 | 61.95 | 51.42 | 40.35 | 41.73 | 51.67 | |||||||||||||
| 1974 | 35.19 | 39.88 | 43.27 | 47.65 | 53.10 | 62.35 | 65.97 | 66.97 | a | 64.73 | 52.85 | 45.40 | 39.34 | 51.39 | ||||||||||||
| 1975 | 38.56 | 39.50 | 42.10 | 43.93 | 54.00 | 59.48 | 66.58 | 62.85 | 63.88 | 51.19 | 41.60 | 40.05 | 50.31 | |||||||||||||
| 1976 | 39.18 | 40.02 | 42.52 | 47.32 | 55.74 | 58.10 | 65.21 | 63.63 | 62.12 | 53.97 | 47.55 | 37.81 | 51.10 | |||||||||||||
| 1977 | 37.19 | 44.89 | 42.35 | 51.42 | 51.76 | 63.78 | 64.40 | 70.08 | 59.40 | 53.40 | 42.77 | 42.52 | 52.00 | |||||||||||||
| 1978 | 42.24 | 43.36 | 50.10 | 48.28 | 53.16 | 62.60 | 66.08 | 65.02 | 57.88 | 55.79 | 40.72 | 34.81 | 51.67 | |||||||||||||
| 1979 | 35.19 | 39.27 | 47.71 | 49.25 | 56.29 | 61.90 | 67.10 | 64.87 | 64.42 | 56.10 | 42.95 | 41.35 | 52.20 | |||||||||||||
| 1980 | 37.87 | 44.36 | 44.40 | 50.65 | 54.00 | 56.93 | 65.98 | 63.27 | 61.25 | 54.68 | 45.68 | 40.79 | 51.66 | |||||||||||||
| 1981 | 42.68 | 43.36 | 45.92 | 49.95 | 54.65 | 60.37 | 64.90 | 69.29 | 62.17 | 51.31 | 45.32 | 40.77 | 52.56 | |||||||||||||
| 1982 | 35.69 | 40.45 | 44.03 | 46.40 | 54.77 | 62.47 | 63.98 | 65.65 | 59.13 | 52.35 | 41.53 | 38.79 | 50.44 | |||||||||||||
| 1983 | 41.06 | 43.14 | 46.60 | 49.07 | 56.73 | 59.12 | 62.63 | 66.44 | 59.60 | 52.68 | 44.18 | 36.85 | 51.51 | |||||||||||||
| 1984 | 39.40 | 42.33 | 47.39 | 46.63 | 53.82 | 57.88 | 66.63 | 65.71 | 59.45 | ----- | z | 41.35 | 36.03 | 50.60 | ||||||||||||
| 1985 | 38.11 | 39.29 | 42.40 | 52.30 | 54.98 | 61.60 | 69.65 | 64.52 | ----- | z | 51.20 | a | 37.12 | 35.66 | 49.71 | |||||||||||
| 1986 | 41.76 | 42.45 | 49.61 | 48.90 | 55.55 | 64.37 | 63.58 | 68.85 | 56.38 | 53.29 | 44.27 | 37.89 | 52.24 | |||||||||||||
| 1987 | 36.08 | 42.20 | 46.16 | 54.33 | a | 57.39 | 64.82 | b | ----- | z | ----- | z | 61.78 | a | 56.71 | 44.53 | 37.58 | 50.16 | ||||||||
| 1988 | 36.84 | 43.02 | a | 45.21 | 50.68 | 53.52 | 58.67 | 65.68 | ----- | z | 60.03 | 57.29 | 42.82 | 36.90 | 50.06 | |||||||||||
| 1989 | 37.35 | 34.95 | 44.23 | 53.48 | 53.61 | 61.03 | 62.40 | 63.10 | 61.05 | 51.63 | 42.63 | 36.40 | 50.16 | |||||||||||||
| 1990 | 39.31 | 37.12 | 46.52 | 52.87 | 53.45 | 60.53 | 67.10 | 66.66 | 63.32 | 49.66 | 42.20 | 30.94 | 50.81 | |||||||||||||
| 1991 | 34.45 | 45.46 | 43.10 | 46.97 | 50.85 | 57.17 | 66.45 | 66.18 | 63.00 | 53.27 | 45.13 | 38.37 | 50.87 | |||||||||||||
| 1992 | 38.92 | 46.26 | 49.23 | 53.15 | 60.00 | 63.43 | 65.77 | 66.68 | 59.10 | 53.03 | 42.33 | 36.47 | 52.86 | |||||||||||||
| 1993 | 34.87 | 38.86 | 47.97 | 48.47 | 57.29 | 57.90 | 60.15 | 63.63 | 61.33 | 54.97 | 37.83 | 35.95 | 49.93 | |||||||||||||
| 1994 | 39.61 | 38.46 | 46.85 | 50.67 | 56.06 | 57.98 | 66.03 | 63.58 | 62.27 | 50.18 | 36.40 | a | 36.87 | 50.41 | ||||||||||||
| 1995 | 41.61 | 45.89 | 44.24 | 47.42 | 55.50 | 59.22 | 66.18 | 62.06 | 63.53 | 50.58 | 46.58 | 41.15 | 52.00 | |||||||||||||
| 1996 | 38.60 | 42.17 | 45.98 | 50.18 | 52.31 | 59.22 | 67.48 | 66.29 | 58.18 | 50.95 | 43.62 | 39.37 | 51.20 | |||||||||||||
| 1997 | 37.40 | 41.46 | 45.19 | 48.58 | 58.92 | 59.88 | 64.73 | 67.10 | 61.40 | 50.40 | 45.45 | 36.24 | 51.40 | |||||||||||||
| 1998 | 41.26 | 43.16 | 45.10 | 48.88 | 52.47 | 60.67 | 68.56 | 66.27 | 63.17 | 51.05 | 43.85 | 35.66 | 51.67 | |||||||||||||
| 1999 | 38.03 | 39.05 | 42.72 | a | 46.98 | 51.77 | 59.17 | 63.02 | 66.18 | a | 60.79 | b | 52.85 | d | 45.94 | c | 37.67 | b | 50.35 | |||||||
| 2000 | 36.94 | 42.29 | a | 42.45 | b | 51.05 | a | 54.31 | b | 61.62 | b | 64.02 | a | 64.48 | 60.40 | 51.43 | b | 38.38 | 37.87 | 50.44 | ||||||
| 2001 | 37.60 | 39.50 | 46.22 | a | 47.47 | a | 57.39 | 57.95 | 65.24 | 66.18 | 61.62 | 51.87 | 44.05 | 37.57 | a | 51.05 | ||||||||||
| 2002 | 37.58 | 41.43 | 42.19 | 49.57 | 53.05 | 61.00 | 67.66 | 64.52 | 60.95 | 50.77 | 43.60 | 40.06 | 51.03 | |||||||||||||
| 2003 | 42.02 | 41.23 | 46.63 | 46.38 | 53.37 | 62.55 | 67.98 | 66.87 | 62.22 | 53.92 | 39.80 | 39.52 | 51.87 | |||||||||||||
| 2004 | 37.52 | 41.14 | 48.81 | 51.32 | 55.24 | 60.42 | 67.29 | 68.21 | 58.48 | 51.84 | 42.65 | 39.92 | 51.90 | |||||||||||||
| 2005 | 38.40 | 41.55 | 47.32 | 48.53 | 55.47 | 57.28 | 66.03 | 66.50 | 57.25 | 52.18 | 40.52 | 36.50 | 50.63 | |||||||||||||
| 2006 | 39.44 | 39.98 | 41.45 | 48.75 | ----- | z | 61.32 | 67.65 | 63.50 | 59.60 | 49.98 | 42.07 | 36.18 | 49.99 | ||||||||||||
| 2007 | 32.89 | 40.27 | 46.19 | 47.88 | 54.52 | 58.85 | 66.77 | 63.89 | 57.98 | 48.13 | 41.23 | 36.87 | 49.62 | |||||||||||||
| 2008 | 33.89 | 39.24 | 40.97 | 44.62 | 54.68 | 57.32 | 65.55 | 65.82 | 60.05 | 51.11 | 44.55 | 34.19 | 49.33 | |||||||||||||
| 2009 | 36.16 | 39.54 | 40.81 | 46.30 | 55.89 | 61.67 | 68.32 | 66.39 | 62.45 | 50.10 | 41.42 | 33.65 | 50.22 | |||||||||||||
| 2010 | 42.39 | 43.02 | 43.95 | 46.57 | 50.68 | 57.65 | 65.24 | 65.26 | 60.98 | 51.97 | 42.33 | 39.05 | 50.76 | |||||||||||||
| 2011 | 38.03 | 38.41 | 42.77 | 44.77 | 49.81 | 57.28 | 61.94 | 65.45 | 64.05 | 52.71 | 41.42 | 35.45 | 49.34 | |||||||||||||
| 2012 | 37.55 | 40.33 | 41.61 | 49.58 | 52.98 | 56.62 | 64.47 | 67.21 | 62.93 | 52.18 | 44.63 | 38.29 | 50.70 | |||||||||||||
| 2013 | 33.84 | 39.68 | 46.23 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.91 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 38.02 | 41.84 | 45.30 | 49.96 | 55.44 | 60.94 | 66.65 | 66.62 | 61.84 | 53.17 | 43.87 | 38.60 | 51.73 | |||||||||||||
| S.D. | 2.97 | 3.00 | 2.64 | 3.04 | 2.52 | 2.34 | 2.34 | 2.25 | 2.62 | 2.34 | 2.58 | 2.75 | 1.32 | |||||||||||||
| SKEW | -0.43 | 0.12 | 0.63 | 0.28 | 0.15 | 0.15 | 0.25 | 0.42 | 0.24 | 0.33 | -0.43 | -0.30 | 0.46 | |||||||||||||
| MAX | 43.08 | 48.18 | 53.97 | 58.78 | 61.65 | 66.37 | 74.95 | 72.30 | 68.45 | 59.76 | 48.92 | 44.79 | 55.34 | |||||||||||||
| MIN | 29.02 | 34.95 | 40.27 | 43.93 | 49.81 | 56.62 | 60.15 | 62.06 | 56.38 | 48.13 | 36.40 | 30.94 | 49.33 | |||||||||||||
| NO YRS | 81 | 81 | 82 | 80 | 79 | 80 | 82 | 83 | 83 | 79 | 82 | 80 | 63 | |||||||||||||