| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.77 | 34.81 | 29.47 | 15.45 | 30.37 | |||||
| 1925 | 30.19 | 31.00 | 28.32 | 35.57 | 41.61 | 42.63 | 48.24 | f | 47.87 | 43.27 | 32.16 | 30.96 | e | 28.32 | 35.63 | |||||||||||
| 1926 | 25.26 | ----- | z | ----- | z | 37.97 | 38.52 | 46.50 | 50.19 | 48.55 | 36.67 | 34.71 | 31.13 | 24.13 | 37.36 | |||||||||||
| 1927 | 19.90 | 29.07 | 27.52 | 29.67 | 34.74 | 45.13 | 46.90 | 48.68 | 43.63 | 36.48 | 33.66 | a | 15.97 | 34.28 | ||||||||||||
| 1928 | 21.97 | 25.48 | 32.42 | 31.53 | 39.06 | 42.67 | 53.45 | 48.30 | a | 39.17 | 32.68 | 28.97 | 21.42 | 34.76 | ||||||||||||
| 1929 | 15.42 | 10.93 | 30.16 | 31.21 | a | 33.57 | c | 43.90 | a | 49.90 | 49.93 | a | 43.00 | 34.35 | 21.33 | 28.97 | 32.72 | |||||||||
| 1930 | 5.87 | a | 31.21 | 29.26 | 35.80 | 37.32 | 40.63 | 51.21 | c | 54.00 | 42.67 | 31.71 | 26.23 | 23.03 | 34.08 | |||||||||||
| 1931 | 26.87 | 25.43 | 29.10 | 33.26 | c | 41.90 | 45.77 | 54.00 | 54.45 | 41.70 | 34.68 | 25.83 | 22.03 | 36.25 | ||||||||||||
| 1932 | 22.77 | 19.55 | 31.61 | 33.20 | 37.90 | 43.97 | 45.42 | 48.84 | 41.27 | 35.00 | 31.87 | 15.48 | 33.91 | |||||||||||||
| 1933 | 21.48 | 17.89 | 27.61 | 28.43 | 33.45 | 45.40 | 50.90 | a | 51.32 | 39.77 | 35.26 | 26.23 | 31.16 | 34.08 | ||||||||||||
| 1934 | 29.03 | 28.57 | 32.42 | 37.73 | ----- | z | 42.40 | ----- | z | 48.81 | 40.73 | 39.10 | 35.17 | 25.81 | 35.98 | |||||||||||
| 1935 | 23.06 | 27.18 | 24.27 | a | 29.67 | 32.19 | ----- | z | 48.87 | 44.77 | 42.40 | 33.13 | 23.62 | d | 22.32 | 31.95 | ||||||||||
| 1936 | 26.68 | 15.55 | 27.39 | 34.33 | 40.06 | 46.50 | 47.06 | 46.00 | 40.00 | a | 33.90 | 20.13 | 24.45 | 33.51 | ||||||||||||
| 1937 | 1.77 | 22.43 | 31.42 | 31.97 | 36.68 | 45.97 | 47.58 | 44.81 | 42.00 | 36.55 | 33.40 | 28.10 | 33.56 | |||||||||||||
| 1938 | 26.10 | 22.79 | 30.58 | 33.37 | 34.35 | 42.90 | 48.52 | 42.65 | 44.33 | 34.35 | 22.83 | 22.52 | 33.77 | |||||||||||||
| 1939 | 23.90 | 21.00 | 28.06 | 31.33 | 38.26 | 40.83 | 48.77 | 47.16 | 41.67 | 34.03 | 25.27 | 29.65 | 34.16 | |||||||||||||
| 1940 | 15.77 | 27.93 | 31.35 | 33.37 | 38.74 | 41.93 | 47.94 | 46.19 | 46.33 | 38.39 | 26.80 | 24.10 | 34.90 | |||||||||||||
| 1941 | 23.74 | 29.00 | 29.94 | 32.73 | 39.77 | 41.67 | 48.52 | 49.81 | 40.23 | 33.61 | 30.48 | a | 26.29 | 35.48 | ||||||||||||
| 1942 | 11.83 | a | 24.57 | 24.65 | 30.93 | 36.97 | 39.70 | 47.55 | 45.87 | 40.17 | 32.68 | 28.75 | b | 26.97 | 32.55 | |||||||||||
| 1943 | 14.55 | 24.68 | 26.52 | 33.60 | 33.87 | a | 39.93 | ----- | z | 42.38 | b | 42.11 | b | ----- | z | ----- | z | ----- | z | 32.20 | ||||||
| 1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.42 | 43.68 | 38.03 | a | 31.32 | c | 25.37 | 18.39 | 33.53 | |||||
| 1949 | 4.48 | 22.39 | 28.26 | 31.37 | 38.84 | 37.47 | 41.16 | 41.29 | 37.73 | 23.42 | 28.52 | a | 23.84 | 29.90 | ||||||||||||
| 1950 | 8.00 | 22.14 | 26.77 | 28.60 | 31.71 | 43.17 | 44.35 | 43.94 | 37.03 | 35.90 | 29.90 | 30.87 | 31.87 | |||||||||||||
| 1951 | 21.81 | 25.79 | 25.42 | 29.60 | 36.74 | 41.43 | 45.74 | 42.16 | 38.86 | a | 33.61 | 27.96 | c | 20.65 | 32.48 | |||||||||||
| 1952 | 17.32 | 24.45 | 25.61 | 31.43 | 35.97 | b | 40.80 | 42.63 | a | ----- | z | ----- | z | 34.84 | 19.67 | c | 24.06 | 29.68 | ||||||||
| 1953 | 32.13 | 25.81 | a | 27.52 | 30.83 | 34.45 | b | 38.25 | b | 42.48 | 45.73 | a | 40.45 | a | 32.27 | a | 31.31 | a | 26.87 | 34.01 | ||||||
| 1954 | 23.23 | 29.36 | 25.29 | 32.57 | 39.23 | 41.93 | 46.37 | a | 44.14 | b | 40.10 | 33.37 | a | 35.33 | 23.94 | 34.57 | ||||||||||
| 1955 | 24.55 | 24.18 | 25.35 | 30.03 | 35.71 | 45.33 | 47.60 | a | 47.45 | 45.39 | b | 38.10 | 26.45 | a | 25.10 | 34.60 | ||||||||||
| 1956 | 26.43 | a | 21.55 | 29.23 | 34.23 | 42.84 | 42.33 | 52.13 | a | 49.90 | 43.67 | 35.63 | a | 27.13 | 26.77 | 35.99 | ||||||||||
| 1957 | 10.90 | 26.32 | 31.39 | 34.77 | 42.84 | 44.53 | 46.94 | 45.35 | 46.70 | 37.16 | 27.40 | 29.74 | 35.34 | |||||||||||||
| 1958 | 27.90 | 34.82 | 28.65 | 33.33 | 44.03 | 48.57 | 53.83 | a | 54.00 | 45.45 | a | 38.26 | 31.87 | 32.74 | 39.45 | |||||||||||
| 1959 | 28.68 | 27.04 | 29.85 | d | 32.82 | b | 35.40 | a | 45.80 | 51.87 | 48.31 | b | 44.38 | a | 37.55 | 27.80 | 24.48 | 36.16 | ||||||||
| 1960 | 20.50 | a | 26.55 | 30.71 | 33.83 | 37.50 | a | 45.25 | b | 52.90 | b | 47.86 | b | 45.38 | a | 38.07 | c | 29.48 | c | 24.73 | a | 36.06 | ||||
| 1961 | 29.71 | 33.18 | 32.40 | a | 33.80 | 38.87 | 48.73 | 51.86 | b | 55.39 | 40.37 | 35.11 | c | 25.97 | a | 27.59 | b | 37.75 | ||||||||
| 1962 | 19.66 | b | 26.85 | a | 29.27 | a | 35.71 | b | 36.39 | 41.67 | 46.71 | c | 47.72 | b | 43.41 | a | 35.62 | b | 32.75 | b | 28.75 | c | 35.38 | |||
| 1963 | 16.97 | 32.71 | 27.77 | 31.90 | a | 39.31 | b | 41.93 | b | 45.38 | b | 49.90 | b | 49.30 | c | 38.63 | a | 32.79 | a | 26.55 | 36.09 | |||||
| 1964 | 27.68 | 24.90 | 26.97 | b | 28.10 | a | 34.47 | a | 44.67 | 50.42 | 46.77 | 41.70 | c | 36.38 | b | 29.00 | b | 24.74 | 34.65 | |||||||
| 1965 | 28.48 | 28.81 | a | 26.35 | 35.17 | 35.90 | 44.52 | c | 50.31 | b | 49.96 | c | 40.31 | a | 40.62 | b | 33.93 | a | 25.53 | a | 36.66 | |||||
| 1966 | 28.06 | 27.52 | a | 29.19 | 32.47 | 40.16 | 44.04 | b | 48.43 | c | 49.52 | 46.45 | a | 37.13 | a | 32.63 | 29.90 | 37.13 | ||||||||
| 1967 | 31.27 | a | 28.96 | 28.37 | a | 29.17 | a | 38.13 | 47.88 | d | 52.32 | c | 56.74 | 49.69 | a | 39.29 | c | 31.11 | b | 25.35 | 38.19 | |||||
| 1968 | 25.93 | a | 32.24 | 32.29 | 31.00 | a | 40.66 | b | 46.04 | e | 55.43 | c | 52.06 | 47.68 | b | 38.00 | a | 32.78 | c | 24.53 | a | 38.22 | ||||
| 1969 | 16.19 | 25.86 | 30.87 | 34.17 | 46.21 | b | 51.04 | c | 51.52 | d | 49.52 | b | 47.17 | a | 35.52 | 33.00 | b | 27.43 | a | 37.37 | ||||||
| 1970 | 26.94 | 30.29 | 30.16 | 30.20 | 39.76 | b | 51.55 | a | 55.13 | a | 51.97 | a | 41.32 | b | 35.67 | a | 30.97 | a | 25.68 | 37.47 | ||||||
| 1971 | 27.74 | 27.18 | 27.87 | a | 30.62 | a | 40.00 | c | 43.85 | c | 56.00 | b | 56.68 | 43.12 | d | 36.41 | b | 31.87 | 26.90 | a | 37.35 | |||||
| 1972 | 24.50 | a | 29.21 | 33.57 | a | 30.73 | 42.33 | d | 48.25 | b | 54.67 | a | 55.06 | 44.24 | e | 36.93 | b | 33.85 | c | 19.87 | a | 37.77 | ||||
| 1973 | 23.53 | a | 30.19 | a | 30.23 | 33.69 | a | 42.52 | 47.35 | d | 53.32 | c | 50.80 | a | 46.62 | f | 39.07 | a | 31.79 | a | 32.16 | 37.69 | ||||
| 1974 | 20.66 | b | 30.21 | 32.29 | 34.53 | 37.87 | 50.48 | a | 52.60 | a | 53.29 | 45.61 | b | 38.03 | a | 34.07 | a | 28.52 | 38.18 | |||||||
| 1975 | 27.45 | 25.86 | 28.32 | 29.83 | a | 37.67 | a | 44.93 | a | 55.00 | c | 49.07 | a | 47.07 | c | 39.52 | b | 31.30 | c | 29.66 | b | 37.14 | ||||
| 1976 | 28.97 | 26.76 | 28.13 | 33.48 | a | 38.04 | c | 42.15 | c | 52.74 | d | 51.30 | a | 49.32 | b | 37.69 | b | 35.62 | d | 27.13 | a | 37.61 | ||||
| 1977 | 22.48 | 29.57 | 28.87 | 36.10 | 37.10 | b | 50.56 | c | 51.00 | b | 58.55 | 44.04 | f | 39.52 | b | 30.03 | 29.19 | 37.54 | ||||||||
| 1978 | 28.87 | 32.36 | 34.90 | 34.45 | a | 36.81 | e | 48.30 | 53.21 | b | 51.38 | b | 41.17 | 32.74 | 20.20 | 18.74 | 36.09 | |||||||||
| 1979 | 6.48 | 27.21 | 30.96 | e | 32.33 | 36.94 | 41.97 | 47.65 | 47.52 | f | 44.50 | r | ----- | z | ----- | z | ----- | z | 31.93 | |||||||
| 1980 | 6.89 | v | 28.28 | 27.84 | 34.17 | 38.10 | 41.13 | 46.71 | 41.81 | 40.90 | 32.58 | 30.00 | 26.57 | a | 35.28 | |||||||||||
| 1981 | 26.84 | 24.96 | 28.61 | 32.57 | 37.00 | 42.27 | 44.45 | 47.35 | 41.73 | 32.52 | 29.07 | 25.45 | 34.40 | |||||||||||||
| 1982 | 18.23 | 24.14 | 27.42 | 28.43 | 34.65 | 46.27 | 47.35 | 46.87 | 40.77 | 31.71 | 23.48 | a | 25.39 | 32.89 | ||||||||||||
| 1983 | 27.74 | 31.46 | 33.77 | 30.20 | 39.35 | 42.57 | 46.48 | 51.06 | 40.33 | 36.90 | 32.97 | 17.87 | a | 35.89 | ||||||||||||
| 1984 | 24.90 | 28.28 | 32.90 | 31.77 | 37.48 | 42.57 | 49.58 | 50.03 | 42.27 | 33.94 | 30.40 | 21.26 | 35.45 | |||||||||||||
| 1985 | 21.39 | 22.14 | 26.77 | 35.03 | 37.87 | 43.30 | 52.32 | 46.58 | 39.60 | 33.19 | 18.00 | 13.61 | 32.48 | |||||||||||||
| 1986 | 27.77 | 29.00 | 34.48 | 30.43 | 39.10 | 49.10 | 45.77 | 53.10 | 39.97 | 35.90 | 30.80 | 24.45 | 36.66 | |||||||||||||
| 1987 | 21.26 | 27.14 | 30.97 | 34.40 | 40.23 | 46.80 | 48.65 | 48.48 | 44.60 | 37.52 | 30.97 | 24.65 | 36.30 | |||||||||||||
| 1988 | 24.48 | 27.17 | 28.90 | 36.97 | 37.74 | 45.43 | 50.97 | 47.94 | 43.27 | 42.48 | 33.10 | 25.06 | 36.96 | |||||||||||||
| 1989 | 26.65 | 16.54 | 31.35 | 38.20 | 39.10 | 45.67 | 46.74 | 47.29 | 43.37 | 35.87 | 31.80 | 23.74 | 35.53 | |||||||||||||
| 1990 | 28.48 | 23.96 | 30.03 | 37.30 | 37.52 | 45.77 | 53.71 | 53.39 | 47.77 | 35.42 | 31.90 | 16.94 | 36.85 | |||||||||||||
| 1991 | 23.48 | 33.07 | 28.87 | 32.27 | 37.39 | 40.83 | 50.61 | 53.26 | 46.03 | 36.45 | 32.93 | 27.52 | 36.89 | |||||||||||||
| 1992 | 29.42 | 32.76 | 33.26 | 37.60 | 40.87 | 47.83 | 49.23 | 50.19 | 42.13 | 39.06 | 29.60 | 21.13 | 37.76 | |||||||||||||
| 1993 | 16.23 | 19.29 | 32.52 | 33.30 | 43.35 | 43.83 | 42.71 | 46.84 | 42.63 | 38.58 | 19.67 | 26.06 | 33.75 | |||||||||||||
| 1994 | 28.77 | 23.04 | 31.10 | 36.10 | 41.90 | 43.33 | 49.87 | 47.23 | 46.97 | 34.10 | 26.33 | 24.97 | 36.14 | |||||||||||||
| 1995 | 25.61 | 31.43 | 29.81 | 32.47 | 39.52 | 44.87 | 50.52 | 46.03 | 45.93 | 34.68 | 34.33 | 25.32 | 36.71 | |||||||||||||
| 1996 | 26.06 | 21.21 | 29.71 | 34.80 | 35.74 | 42.00 | 51.26 | 48.94 | 40.23 | 35.42 | 29.17 | 25.52 | 35.00 | |||||||||||||
| 1997 | 23.71 | 26.68 | 30.97 | 31.77 | 41.58 | 43.73 | 49.48 | 52.45 | 45.93 | 35.10 | 32.53 | 23.84 | 36.48 | |||||||||||||
| 1998 | 27.19 | 30.21 | 30.77 | 33.23 | 38.68 | 43.20 | 51.94 | 48.13 | 45.60 | 31.84 | 32.27 | 22.87 | 36.33 | |||||||||||||
| 1999 | 27.13 | 27.79 | 28.61 | 29.50 | 34.68 | 42.50 | 46.77 | 50.65 | 41.33 | 34.77 | 35.33 | 26.50 | a | 35.46 | ||||||||||||
| 2000 | 24.03 | 28.03 | 28.29 | 34.17 | 38.32 | 43.90 | 47.29 | ----- | z | 42.20 | 35.81 | 24.97 | 25.00 | 33.82 | ||||||||||||
| 2001 | 25.35 | 24.21 | 29.65 | 30.17 | ----- | z | ----- | z | 50.67 | a | 52.93 | d | 46.86 | h | ----- | z | ----- | z | ----- | z | 35.50 | |||||
| 2002 | 24.90 | 26.29 | 26.03 | 33.00 | 37.32 | 46.83 | 51.87 | 48.32 | 41.60 | ----- | z | 28.20 | 28.16 | 35.68 | ||||||||||||
| 2003 | 31.06 | 25.68 | 32.19 | e | 32.63 | 39.81 | 46.43 | 53.71 | 51.35 | 45.92 | f | 38.68 | 25.62 | d | 26.67 | d | 36.71 | |||||||||
| 2004 | 22.58 | 27.25 | e | 31.92 | f | 32.80 | e | 39.50 | c | 44.62 | d | 51.77 | 53.50 | e | 42.94 | l | 38.65 | 29.50 | 29.26 | 36.94 | ||||||
| 2005 | 26.56 | d | ----- | z | 32.29 | 33.13 | 42.54 | e | 43.33 | 52.10 | 51.48 | ----- | z | 38.42 | 28.67 | ----- | z | 38.72 | ||||||||
| 2006 | 31.52 | 21.93 | ----- | z | ----- | z | 40.00 | ----- | z | 53.06 | 49.13 | 43.48 | c | ----- | z | 29.21 | f | 23.94 | 37.58 | |||||||
| 2007 | ----- | z | 26.75 | d | 29.65 | h | 31.00 | f | 36.96 | h | 44.15 | c | 53.74 | 47.47 | a | 41.17 | g | 35.53 | p | 27.12 | e | 26.82 | i | 39.85 | ||
| 2008 | 20.12 | g | 25.62 | p | 26.67 | g | 26.91 | h | 40.79 | g | 43.53 | o | 50.28 | m | 48.06 | o | 42.85 | d | 35.80 | a | 32.43 | g | 19.19 | d | 32.61 | |
| 2009 | 20.08 | f | 24.19 | g | 24.12 | g | 28.61 | g | ----- | z | 44.67 | 64.97 | 48.81 | d | ----- | z | 30.32 | 27.70 | 16.61 | 38.85 | ||||||
| 2010 | 28.68 | 25.96 | 26.00 | 28.93 | 34.19 | 39.83 | 46.19 | 45.03 | 40.90 | 34.19 | 25.43 | 22.68 | 33.17 | |||||||||||||
| 2011 | 23.23 | 17.86 | 27.77 | 25.80 | 31.43 | a | 38.70 | 42.65 | 46.27 | a | 42.63 | 33.10 | b | 26.90 | a | 24.67 | a | 31.75 | ||||||||
| 2012 | 29.84 | 30.59 | 28.58 | 34.03 | 36.24 | b | 42.90 | 49.50 | a | 49.77 | a | 43.57 | b | 35.88 | f | 32.39 | b | 26.15 | e | 36.69 | ||||||
| 2013 | 18.90 | b | 25.32 | c | 29.40 | a | 36.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.54 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 23.20 | 26.29 | 29.41 | 32.68 | 38.14 | 44.20 | 49.69 | 49.02 | 42.83 | 35.54 | 29.19 | 24.72 | 35.39 | |||||||||||||
| S.D. | 6.53 | 4.35 | 2.40 | 2.54 | 2.92 | 2.95 | 3.85 | 3.62 | 2.91 | 2.83 | 4.05 | 3.99 | 1.92 | |||||||||||||
| SKEW | -1.37 | -0.80 | 0.07 | 0.00 | 0.07 | 0.31 | 0.46 | 0.18 | 0.33 | -0.79 | -0.76 | -0.67 | -0.41 | |||||||||||||
| MAX | 32.13 | 34.82 | 34.90 | 38.20 | 46.21 | 51.55 | 64.97 | 58.55 | 49.69 | 42.48 | 35.62 | 32.74 | 39.45 | |||||||||||||
| MIN | 1.77 | 10.93 | 24.27 | 25.80 | 31.43 | 37.47 | 41.16 | 41.29 | 36.67 | 23.42 | 18.00 | 13.61 | 29.90 | |||||||||||||
| NO YRS | 80 | 80 | 78 | 79 | 78 | 79 | 80 | 80 | 75 | 78 | 80 | 80 | 62 | |||||||||||||