YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1913 | 33.27 | 37.70 | 40.05 | 47.92 | 52.60 | 58.83 | 62.85 | 64.13 | 57.30 | 47.84 | 44.57 | 40.53 | a | 48.97 | ||||||||||||
1914 | 41.85 | 41.43 | 46.92 | 50.85 | 56.35 | 58.22 | 63.32 | 62.19 | 55.52 | 55.67 | a | 44.93 | 35.65 | 51.08 | ||||||||||||
1915 | 38.47 | 43.05 | 49.90 | 51.48 | 54.13 | 58.38 | 62.63 | 65.37 | 57.12 | 51.94 | 41.03 | 39.47 | 51.08 | |||||||||||||
1916 | 28.85 | 41.53 | 43.24 | 48.47 | 50.90 | 57.83 | 59.65 | 62.81 | 57.67 | a | 47.73 | 40.53 | 35.82 | 47.92 | ||||||||||||
1917 | 35.26 | 37.46 | 39.39 | 44.77 | 51.16 | 54.71 | d | 62.71 | 63.79 | 57.55 | 50.97 | 48.18 | 42.97 | 49.08 | ||||||||||||
1918 | 41.37 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.37 | k | |
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1920 | 36.89 | 38.00 | 43.48 | 44.28 | a | 50.50 | 57.87 | 63.95 | 64.42 | 57.28 | 47.90 | 45.35 | 41.31 | 49.27 | ||||||||||||
1921 | 39.47 | 41.32 | 43.40 | 46.63 | 52.58 | 59.40 | 60.34 | 62.63 | 55.77 | 50.10 | 43.90 | 36.95 | 49.37 | |||||||||||||
1922 | 32.92 | 37.30 | 40.39 | 44.88 | b | 54.08 | 61.52 | 64.47 | 63.34 | 59.40 | 50.79 | 40.87 | 35.19 | 48.76 | ||||||||||||
1923 | 37.34 | 35.96 | 42.63 | 50.63 | 52.98 | 59.37 | 65.11 | 67.18 | 59.02 | 53.56 | 45.40 | 40.90 | 50.84 | |||||||||||||
1924 | 39.24 | 45.14 | 42.85 | 48.20 | 56.27 | 59.02 | 63.52 | 62.77 | 58.70 | 51.76 | 42.28 | 34.76 | 50.38 | |||||||||||||
1925 | 40.40 | 43.95 | 43.58 | 49.40 | 56.82 | 59.87 | 67.15 | 63.32 | 58.23 | 49.85 | 43.55 | 41.81 | 51.49 | |||||||||||||
1926 | 39.60 | 44.79 | 49.00 | 54.62 | 55.31 | 62.32 | 67.73 | 64.11 | 56.98 | 52.73 | 47.60 | 38.78 | a | 52.80 | ||||||||||||
1927 | 38.73 | 41.88 | 42.32 | 47.58 | 50.95 | 61.67 | 64.06 | 64.92 | 57.27 | 51.97 | 43.98 | 34.68 | 50.00 | |||||||||||||
1928 | 40.89 | 41.21 | 47.45 | 47.43 | 56.97 | 58.55 | 64.18 | 63.42 | a | 56.67 | 50.15 | 43.78 | 36.89 | 50.63 | ||||||||||||
1929 | 30.97 | 33.32 | 44.32 | 45.48 | 53.15 | 57.93 | 62.48 | 63.74 | 60.20 | 53.94 | 41.02 | 41.13 | 48.97 | |||||||||||||
1930 | 28.65 | 42.18 | 45.31 | 51.17 | 52.50 | 57.48 | 62.16 | 64.44 | 58.07 | 50.08 | 40.70 | 39.73 | 49.37 | |||||||||||||
1931 | 43.61 | 42.48 | 45.71 | 50.52 | 57.29 | 59.12 | 64.15 | 62.90 | 58.22 | 50.15 | 39.75 | 38.77 | 51.06 | |||||||||||||
1932 | 36.61 | 38.17 | 45.06 | 49.05 | 52.82 | 60.67 | 60.55 | 62.85 | 58.92 | 52.89 | 46.52 | 35.48 | 49.97 | |||||||||||||
1933 | 37.18 | 35.41 | 43.85 | 47.15 | 50.16 | 57.12 | 61.19 | 64.71 | 55.53 | 50.38 | a | 42.53 | 42.27 | 48.96 | ||||||||||||
1934 | 42.71 | 45.96 | 49.77 | 53.70 | 56.68 | 59.57 | 61.69 | 64.32 | 57.03 | 52.92 | a | 46.60 | 40.26 | 52.60 | ||||||||||||
1935 | 39.10 | 43.04 | 40.76 | 47.72 | 53.69 | 59.18 | 62.48 | 62.52 | i | 60.72 | 48.60 | 39.22 | 40.98 | 48.68 | a | |||||||||||
1936 | 40.65 | 31.88 | 41.97 | 51.07 | a | 55.89 | 60.12 | 63.00 | 64.81 | 57.20 | 51.74 | 41.22 | 40.26 | 49.98 | ||||||||||||
1937 | 27.39 | 38.82 | 46.71 | 46.55 | 54.19 | 60.53 | 63.35 | a | 62.03 | 58.87 | 53.31 | 44.30 | 40.71 | 49.73 | ||||||||||||
1938 | 38.87 | 42.18 | 43.69 | 50.20 | 55.11 | 59.97 | 65.60 | 61.71 | 61.85 | 52.39 | 41.77 | 39.40 | 51.06 | |||||||||||||
1939 | 41.19 | 37.59 | a | 44.15 | 50.92 | 55.47 | 56.90 | 63.87 | 65.31 | 58.70 | 51.13 | 48.20 | 43.94 | 51.45 | ||||||||||||
1940 | 42.71 | 43.38 | 47.82 | 51.22 | 57.44 | 61.82 | 63.87 | 64.05 | 61.22 | 53.85 | 40.90 | 42.05 | 52.53 | |||||||||||||
1941 | 43.06 | 45.68 | 51.00 | 52.50 | 54.79 | 59.32 | 67.92 | 63.97 | 56.79 | a | 50.73 | 45.68 | 39.81 | 52.60 | ||||||||||||
1942 | 39.47 | 40.73 | 44.13 | a | 50.60 | 53.98 | 58.00 | 66.19 | 66.11 | 60.20 | 52.82 | 42.38 | 40.32 | 51.25 | ||||||||||||
1943 | 32.00 | 42.77 | 43.44 | 51.37 | 52.39 | 57.10 | 63.26 | 62.26 | 60.63 | 50.95 | 44.20 | 37.65 | 49.83 | |||||||||||||
1944 | 40.55 | 39.78 | 43.13 | 49.13 | 54.42 | 59.10 | 64.32 | 63.06 | 61.52 | 53.85 | 43.05 | 37.92 | 50.82 | |||||||||||||
1945 | 40.06 | 40.79 | 42.90 | 45.95 | 55.74 | 58.12 | 64.82 | 63.10 | 56.38 | 50.92 | 41.95 | 38.68 | 49.95 | |||||||||||||
1946 | 38.74 | 40.66 | 43.40 | 47.62 | 56.44 | 57.30 | 63.00 | 62.90 | 58.18 | 46.53 | 39.65 | 37.60 | 49.34 | |||||||||||||
1947 | 33.58 | 42.95 | 47.35 | 51.58 | 57.45 | 58.43 | 62.34 | 62.31 | 59.33 | 50.77 | 41.63 | 41.35 | 50.76 | |||||||||||||
1948 | 36.42 | 37.90 | 42.16 | 44.72 | 52.56 | 60.87 | 60.73 | 59.68 | 54.78 | 48.63 | a | 40.90 | 35.08 | 47.87 | ||||||||||||
1949 | 28.68 | 37.00 | 44.18 | 49.40 | 55.95 | 57.15 | 60.31 | 61.44 | 58.02 | 45.92 | 49.23 | 38.24 | 48.79 | |||||||||||||
1950 | 24.50 | 39.82 | 41.98 | 47.07 | 52.40 | 59.75 | 62.98 | 63.31 | 57.23 | 48.58 | 42.90 | 45.08 | 48.80 | |||||||||||||
1951 | 37.60 | 40.61 | 39.34 | 49.48 | 54.26 | 61.15 | 64.34 | 61.27 | 58.60 | 50.10 | 43.83 | 36.16 | 49.73 | |||||||||||||
1952 | 36.45 | 40.21 | 41.67 | a | 48.83 | 54.03 | 56.33 | 63.47 | 63.29 | 58.75 | 52.32 | 40.52 | 41.50 | 49.78 | ||||||||||||
1953 | 44.19 | 40.73 | 43.06 | 47.28 | 53.23 | 55.02 | 61.81 | 61.95 | a | 57.77 | 51.02 | 46.77 | 42.50 | 50.44 | ||||||||||||
1954 | 35.79 | 42.57 | 41.40 | 45.25 | 53.48 | a | 54.85 | 58.21 | 58.84 | 55.73 | 48.45 | 47.98 | 40.77 | 48.61 | ||||||||||||
1955 | 38.26 | 37.43 | 37.73 | a | 44.52 | 50.26 | 57.32 | 59.15 | 58.85 | 56.50 | a | 49.98 | 38.67 | a | 38.84 | 47.29 | ||||||||||
1956 | 39.10 | 35.31 | 41.16 | 49.28 | 56.97 | 55.97 | 62.90 | 61.66 | 56.68 | 49.06 | 41.88 | 40.44 | 49.20 | |||||||||||||
1957 | 32.40 | 38.52 | 43.89 | 48.98 | 56.23 | 59.02 | 60.10 | 60.61 | 61.20 | 49.94 | 42.97 | 42.71 | 49.71 | |||||||||||||
1958 | 43.82 | 48.02 | 43.29 | 48.85 | 58.52 | 62.73 | 67.73 | 64.26 | 57.92 | 53.13 | 43.03 | 45.27 | 53.05 | |||||||||||||
1959 | 40.32 | 40.43 | 43.66 | 49.45 | 52.85 | 59.23 | 64.60 | 60.85 | 56.38 | 50.73 | 43.05 | 39.71 | 50.11 | |||||||||||||
1960 | 39.44 | 41.47 | 43.74 | 49.08 | 51.69 | 58.25 | 64.19 | 61.66 | 57.20 | 52.39 | 44.03 | 39.58 | 50.23 | |||||||||||||
1961 | 44.98 | 44.64 | 46.18 | 47.65 | 54.73 | 62.48 | 65.19 | 66.35 | 58.43 | 50.35 | 41.92 | 39.10 | 51.83 | |||||||||||||
1962 | 38.68 | 43.16 | 42.79 | 50.07 | 50.26 | 57.53 | 61.53 | 63.15 | 59.83 | 52.03 | 46.00 | 42.03 | 50.59 | |||||||||||||
1963 | 33.53 | 48.41 | 43.00 | 47.13 | 55.40 | 57.58 | 60.87 | 62.71 | 62.43 | 53.16 | 44.13 | 41.08 | 50.79 | |||||||||||||
1964 | 40.52 | 40.36 | 42.97 | 45.28 | 51.82 | 57.02 | 61.85 | 60.82 | 56.17 | 52.15 | 39.47 | 34.79 | 48.60 | |||||||||||||
1965 | 38.48 | 41.09 | 44.94 | 49.10 | 51.05 | 58.57 | 64.97 | 64.56 | 56.43 | 54.29 | 47.68 | 38.02 | 50.76 | |||||||||||||
1966 | 39.23 | 41.91 | 44.61 | 49.05 | 53.61 | 57.63 | 61.29 | 63.19 | 60.32 | 50.56 | 45.05 | 42.95 | 50.78 | |||||||||||||
1967 | 41.06 | 41.48 | 41.23 | 44.53 | 54.11 | 62.97 | 64.10 | 69.10 | 62.33 | 52.56 | 44.48 | 38.97 | 51.41 | |||||||||||||
1968 | 39.19 | 46.10 | 46.56 | 46.95 | 54.48 | 58.80 | 65.11 | 61.98 | 57.95 | 50.21 | 44.73 | 34.66 | 50.56 | |||||||||||||
1969 | 31.15 | 39.30 | 44.44 | 47.85 | 57.10 | 63.52 | 63.03 | 61.19 | 58.93 | 50.19 | 43.85 | 42.02 | 50.21 | |||||||||||||
1970 | 38.81 | 45.12 | 44.81 | 45.10 | 53.55 | 61.72 | 63.60 | 62.56 | 56.38 | 49.26 | 44.30 | 36.97 | 50.18 | |||||||||||||
1971 | 38.60 | 40.68 | 41.06 | 48.12 | 54.98 | 55.40 | 63.89 | 66.40 | 56.70 | 48.44 | 43.17 | 35.98 | 49.45 | |||||||||||||
1972 | 34.32 | 40.16 | 45.56 | 45.60 | 56.97 | 58.62 | 64.39 | 65.37 | 55.88 | 48.79 | 43.87 | 35.05 | 49.55 | |||||||||||||
1973 | 38.05 | a | 43.89 | a | 44.19 | 48.92 | 55.79 | 59.02 | 63.60 | 60.16 | 60.17 | 51.16 | 40.53 | 41.81 | b | 50.61 | ||||||||||
1974 | 36.18 | a | 41.21 | 44.02 | 48.00 | 50.97 | 59.78 | a | 61.55 | 63.63 | 62.75 | 51.47 | 44.97 | a | 41.90 | 50.54 | ||||||||||
1975 | 37.67 | b | 40.02 | 41.71 | 44.55 | 54.02 | 57.12 | 63.92 | a | 60.71 | 59.63 | 50.13 | 43.22 | 40.32 | 49.42 | |||||||||||
1976 | 40.41 | b | 39.21 | 41.40 | 48.65 | 54.50 | 56.77 | 63.23 | 61.34 | 60.02 | 50.95 | 44.00 | 40.11 | 50.05 | ||||||||||||
1977 | 33.76 | b | 46.02 | 42.50 | 50.95 | 51.53 | a | 60.75 | 62.26 | 67.76 | 56.27 | 48.95 | 40.83 | 38.95 | 50.04 | |||||||||||
1978 | 41.48 | a | 43.64 | 46.47 | 47.52 | 53.42 | 62.53 | 63.94 | 62.77 | 55.38 | 50.37 | 38.38 | 33.52 | 49.95 | ||||||||||||
1979 | 33.03 | 38.85 | a | 46.58 | 47.63 | 55.18 | 59.43 | 64.34 | 62.37 | 60.02 | 50.90 | 41.48 | 42.38 | a | 50.18 | |||||||||||
1980 | 32.27 | 41.19 | 42.55 | 51.35 | 53.14 | b | 56.17 | 62.74 | 61.10 | a | 58.02 | 53.13 | 44.90 | 42.57 | a | 49.93 | ||||||||||
1981 | 44.35 | 42.20 | 47.59 | b | 48.92 | 53.92 | 57.95 | a | 63.00 | 68.33 | a | 59.63 | 47.90 | a | 44.72 | 39.67 | a | 51.51 | ||||||||
1982 | 36.73 | e | 40.40 | c | 43.02 | c | 46.12 | f | 53.64 | f | 61.64 | i | 61.20 | i | 63.42 | g | 58.98 | h | 51.19 | g | 40.17 | a | 36.90 | e | 39.44 | g |
1983 | 42.21 | c | 45.42 | c | 46.97 | a | 48.83 | f | 56.23 | k | 57.63 | d | 60.34 | i | 63.05 | j | 56.06 | e | 49.40 | a | 44.97 | 32.77 | a | 46.93 | d | |
1984 | 40.71 | 42.33 | 46.44 | 46.60 | a | 51.87 | a | 56.93 | a | 62.98 | a | 63.76 | b | 57.97 | a | 47.39 | 43.28 | a | 35.75 | a | 49.67 | |||||
1985 | 34.68 | 37.55 | 41.56 | 49.42 | 54.65 | 59.29 | b | 68.15 | 63.73 | 55.37 | 49.00 | c | 32.81 | a | 32.37 | a | 48.21 | |||||||||
1986 | 45.35 | 42.54 | a | 48.58 | 47.66 | b | 54.95 | 62.23 | 60.63 | a | ----- | z | 57.84 | a | 53.34 | 44.12 | 40.98 | 50.75 | a | |||||||
1987 | 39.58 | 45.45 | 47.66 | 52.42 | 56.11 | 61.22 | 63.76 | 64.76 | 62.00 | a | 54.37 | 48.47 | 38.24 | b | 52.84 | |||||||||||
1988 | 40.00 | 43.28 | 45.42 | 50.23 | 54.32 | a | 58.62 | 63.76 | 64.42 | a | 60.08 | 52.95 | c | 44.93 | 40.32 | a | 51.53 | |||||||||
1989 | 40.18 | a | 34.87 | b | 43.47 | a | 52.75 | b | 55.04 | e | 61.64 | e | 62.08 | f | 63.15 | e | 62.61 | g | 51.79 | b | 45.87 | 41.40 | a | 49.02 | b | |
1990 | 41.52 | 39.36 | c | 47.72 | b | 51.04 | g | 54.34 | c | 59.69 | d | 67.24 | j | 65.69 | e | 61.89 | g | 50.07 | h | 45.36 | e | 33.54 | h | 50.53 | e | |
1991 | 39.07 | c | 48.29 | d | 43.81 | e | 48.05 | i | 52.70 | f | 57.08 | f | 65.93 | i | 66.55 | i | 60.59 | g | 51.08 | g | 46.13 | c | 43.19 | d | 44.10 | g |
1992 | 44.60 | a | 47.34 | g | 49.29 | g | 53.45 | i | 57.98 | e | 62.32 | h | 64.33 | g | 65.39 | i | 58.95 | i | 52.50 | i | 44.32 | e | 38.52 | g | 48.97 | i |
1993 | 35.85 | e | 41.60 | g | 47.54 | h | 48.74 | g | 57.74 | h | 58.45 | j | 59.77 | i | 63.34 | f | 60.48 | e | 52.69 | 40.21 | a | 39.32 | 45.71 | g | ||
1994 | 42.60 | 38.82 | 46.79 | 50.07 | a | 55.74 | 57.97 | 65.08 | 64.35 | 61.48 | a | 50.69 | 40.45 | 39.50 | 51.13 | |||||||||||
1995 | 45.73 | 42.50 | 45.20 | c | 49.26 | c | 57.60 | a | 59.76 | a | 65.50 | b | 62.02 | c | 63.08 | d | 51.64 | c | 49.07 | b | 42.79 | 52.84 | ||||
1996 | 39.45 | 43.28 | 47.06 | 51.24 | a | 51.92 | 58.55 | 66.98 | 65.05 | 57.90 | 51.37 | 42.92 | 38.94 | 51.22 | ||||||||||||
1997 | 41.47 | 42.41 | a | 45.48 | 49.73 | 58.85 | 58.80 | 63.78 | a | 67.06 | 62.14 | a | 51.13 | 49.40 | 42.42 | a | 52.72 | |||||||||
1998 | 42.24 | 45.34 | 47.16 | 48.83 | 53.60 | a | 59.21 | a | 66.53 | 65.70 | a | 61.73 | 52.21 | 45.90 | 39.58 | 52.34 | ||||||||||
1999 | 41.23 | a | 41.57 | 42.72 | b | 47.50 | 50.77 | 56.78 | 61.38 | a | 63.28 | a | 58.64 | a | 50.47 | 47.92 | 40.53 | 50.23 | ||||||||
2000 | 38.94 | 43.19 | 43.79 | 50.03 | 53.16 | 59.98 | a | 62.98 | 62.10 | 58.84 | a | 51.60 | 41.31 | a | 40.73 | a | 50.55 | |||||||||
2001 | 42.05 | 39.66 | 44.52 | 46.82 | 54.03 | a | 56.77 | 61.47 | 63.37 | 58.87 | 49.88 | a | 47.48 | 39.72 | a | 50.39 | ||||||||||
2002 | 40.21 | 41.05 | 38.13 | 46.53 | 52.21 | 60.13 | 63.37 | a | 62.69 | 59.35 | 49.37 | 46.72 | 41.98 | 50.15 | ||||||||||||
2003 | 44.29 | 39.61 | 45.37 | 47.58 | 52.78 | b | 61.48 | 65.92 | 65.18 | ----- | z | 53.53 | 40.98 | b | 41.89 | 50.78 | a | |||||||||
2004 | 39.47 | 43.43 | 46.35 | 50.96 | c | 55.32 | 60.87 | 66.16 | 65.87 | 57.58 | 51.71 | 43.52 | 40.52 | 51.81 | ||||||||||||
2005 | 41.10 | a | 40.77 | 47.56 | 48.91 | a | 56.37 | 57.68 | 63.77 | 65.35 | 57.91 | a | ----- | z | 41.78 | 39.22 | a | 50.95 | a | |||||||
2006 | 43.03 | a | 39.79 | b | 43.30 | a | 48.95 | a | 54.16 | 60.78 | a | 65.24 | 63.26 | 60.25 | 50.07 | a | 43.82 | 40.87 | 51.13 | |||||||
2007 | 36.95 | b | 42.63 | a | 45.97 | a | 48.57 | 53.48 | 58.60 | 65.28 | a | 62.44 | 57.50 | 48.95 | 42.67 | ----- | z | 51.18 | a | |||||||
2008 | 37.47 | 41.43 | 41.47 | a | 44.37 | ----- | z | 56.07 | b | 63.83 | a | 65.13 | a | 58.23 | 49.56 | 47.61 | b | 35.65 | a | 49.17 | a | |||||
2009 | 38.76 | 41.79 | 41.77 | 48.42 | 54.56 | 62.90 | 68.82 | 64.89 | 60.13 | 50.58 | 45.45 | 35.85 | 51.16 | |||||||||||||
2010 | 46.35 | 45.29 | 45.92 | 47.53 | 53.03 | 57.28 | 64.50 | 64.81 | 60.02 | 52.56 | 43.43 | 43.63 | 52.03 | |||||||||||||
2011 | 41.74 | 39.23 | 44.81 | 45.15 | 52.03 | 58.73 | 61.66 | 64.61 | 62.97 | 51.55 | 42.90 | 38.79 | 50.35 | |||||||||||||
2012 | 39.76 | 44.31 | 42.61 | 48.17 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.23 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 38.56 | 41.28 | 44.19 | 48.52 | 54.16 | 58.97 | 63.54 | 63.50 | 58.58 | 50.93 | 43.59 | 39.43 | 50.39 | |||||||||||||
S.D. | 4.23 | 3.11 | 2.56 | 2.28 | 2.06 | 1.98 | 2.05 | 1.95 | 2.01 | 1.88 | 2.81 | 2.80 | 1.24 | |||||||||||||
SKEW | -0.87 | -0.26 | 0.13 | 0.08 | 0.05 | 0.21 | 0.14 | 0.21 | 0.37 | -0.14 | -0.34 | -0.45 | 0.11 | |||||||||||||
MAX | 46.35 | 48.41 | 51.00 | 54.62 | 58.85 | 63.52 | 68.82 | 69.10 | 63.08 | 55.67 | 49.40 | 45.27 | 53.05 | |||||||||||||
MIN | 24.50 | 31.88 | 37.73 | 44.28 | 50.16 | 54.71 | 58.21 | 58.84 | 54.78 | 45.92 | 32.81 | 32.37 | 47.29 | |||||||||||||
YRS | 99 | 96 | 96 | 91 | 92 | 93 | 90 | 90 | 91 | 92 | 97 | 94 | 84 |