YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | 26.93 | a | 32.68 | 31.20 | 44.68 | 45.83 | 55.58 | 51.23 | 47.97 | 39.77 | 31.40 | 21.61 | 38.99 | a | ||||||||||
1929 | 10.27 | a | 15.89 | 30.16 | 31.37 | 40.87 | 45.50 | 51.77 | 55.50 | a | 45.23 | 41.23 | 29.37 | 29.57 | a | 35.56 | ||||||||||
1930 | 8.53 | a | 29.54 | 32.00 | 38.73 | 38.90 | 42.77 | 54.70 | a | 56.33 | g | 48.07 | b | 34.97 | ----- | z | 22.16 | 35.04 | b | |||||||
1931 | 26.60 | a | 27.07 | a | 31.10 | 36.43 | b | 44.14 | b | 47.30 | 55.55 | 54.90 | 45.73 | 38.77 | 25.67 | 19.23 | 37.71 | |||||||||
1932 | 21.90 | b | 23.07 | 30.97 | a | 35.45 | a | 40.84 | 47.37 | 48.97 | 52.90 | 48.07 | 40.42 | 33.87 | 19.61 | 36.95 | ||||||||||
1933 | 21.29 | 15.63 | a | 26.77 | 34.30 | 36.35 | 47.03 | 56.29 | 56.81 | 42.33 | 43.19 | 31.93 | a | 29.77 | 36.81 | |||||||||||
1934 | 31.19 | 32.54 | 37.03 | 42.97 | 44.45 | 47.83 | 55.03 | a | 57.77 | 46.55 | a | 41.30 | a | 34.14 | a | 26.26 | 41.42 | |||||||||
1935 | 24.03 | b | 28.07 | 26.48 | 32.33 | 41.65 | 45.23 | 52.57 | a | 52.71 | 52.10 | 38.13 | a | 27.27 | 24.60 | a | 37.10 | |||||||||
1936 | ----- | z | ----- | z | 28.37 | a | 39.33 | 46.58 | 49.40 | 53.06 | 53.87 | 47.87 | 43.94 | 27.90 | a | 28.29 | 41.86 | b | ||||||||
1937 | 6.79 | b | 16.75 | 27.84 | 33.40 | 40.90 | a | 49.31 | a | 55.32 | 50.13 | 49.57 | 43.32 | 33.97 | a | 28.68 | 36.33 | |||||||||
1938 | 25.83 | b | 24.64 | 30.26 | 36.97 | 41.35 | 50.03 | 57.81 | 52.03 | 55.40 | 40.87 | 27.13 | 26.61 | 39.08 | ||||||||||||
1939 | 28.16 | 22.00 | 31.03 | 36.37 | 43.90 | 45.31 | a | 55.13 | 56.32 | 50.30 | 39.90 | 34.10 | 31.29 | 39.48 | ||||||||||||
1940 | 24.39 | 29.62 | 35.13 | 37.87 | 45.81 | 51.47 | 54.61 | 55.32 | 51.90 | 42.68 | 26.63 | 28.00 | 40.29 | |||||||||||||
1941 | 25.65 | 29.93 | 33.94 | 37.30 | 39.55 | 43.80 | 55.43 | a | 51.48 | 42.83 | 36.67 | a | 31.47 | 25.32 | 37.78 | |||||||||||
1942 | 13.60 | a | 25.29 | 28.13 | 35.57 | 39.74 | 44.17 | 54.10 | 53.87 | 48.07 | 38.87 | 27.23 | 26.20 | a | 36.24 | |||||||||||
1943 | 12.03 | b | 26.48 | a | 28.55 | 36.93 | 37.06 | ----- | z | ----- | z | ----- | z | 51.57 | b | 39.94 | 30.19 | d | 23.45 | 31.80 | c | |||||
1944 | 23.23 | 26.07 | 27.77 | 33.93 | 41.03 | 46.77 | 53.89 | d | 49.45 | k | 51.17 | a | 44.45 | 27.44 | u | 21.23 | a | 36.95 | b | |||||||
1945 | 26.16 | 28.25 | 27.97 | 32.43 | 40.61 | 43.43 | 53.32 | 55.45 | 44.87 | 39.71 | 26.73 | 21.17 | a | 36.68 | ||||||||||||
1946 | 23.52 | 25.70 | a | 28.94 | 33.57 | 43.39 | c | 44.20 | 52.20 | a | 53.62 | b | 45.86 | a | 34.10 | a | 27.33 | 25.72 | b | 36.51 | ||||||
1947 | 20.33 | a | 29.81 | a | 33.84 | 36.71 | b | 44.86 | c | 43.60 | e | 51.47 | a | 50.39 | 48.66 | a | 39.58 | 30.33 | 27.37 | a | 38.08 | |||||
1948 | 22.42 | 20.86 | 27.17 | b | 32.00 | b | 39.81 | e | 51.07 | a | 49.00 | a | 46.32 | i | 43.26 | c | 36.90 | 28.53 | 17.29 | 33.48 | a | |||||
1949 | 6.26 | 22.25 | 29.90 | b | 34.83 | 44.63 | a | 49.17 | 50.29 | c | 49.41 | b | 49.27 | d | 34.70 | h | 33.74 | k | 24.03 | 36.00 | b | |||||
1950 | 3.71 | 16.11 | 28.58 | 25.10 | 35.43 | a | 46.13 | 51.76 | b | 53.94 | 49.30 | 37.75 | c | 29.77 | 29.83 | h | 34.32 | a | ||||||||
1951 | 19.52 | 28.00 | h | 29.93 | d | 37.18 | b | 37.43 | c | 47.41 | a | 51.52 | d | 48.92 | f | 48.39 | b | 32.10 | a | 28.12 | d | 18.75 | c | 35.03 | b | |
1952 | 17.00 | f | 24.92 | d | ----- | z | 35.04 | e | 39.90 | b | 43.52 | c | 52.61 | c | 49.52 | b | 41.50 | p | ----- | z | ----- | z | ----- | z | 40.92 | f |
1953 | ----- | z | ----- | z | 28.46 | c | 33.83 | a | 38.21 | c | 40.30 | c | 50.69 | b | ----- | z | ----- | z | 38.18 | n | 33.07 | 28.48 | 36.15 | e | ||
1954 | 21.90 | 24.11 | 26.87 | 31.67 | 41.03 | 42.53 | ----- | z | ----- | z | ----- | z | ----- | z | 34.08 | r | 24.74 | 30.41 | e | |||||||
1955 | 22.58 | 23.64 | 23.63 | a | 29.63 | 37.16 | 46.70 | 48.87 | a | 48.80 | f | 47.40 | 37.90 | 22.60 | 21.16 | 32.84 | a | |||||||||
1956 | 23.26 | 17.83 | 27.74 | 36.20 | 44.65 | 42.00 | 54.35 | 53.10 | 47.37 | 35.94 | 25.63 | 25.19 | 36.10 | |||||||||||||
1957 | 9.10 | 23.07 | 28.81 | 35.30 | 44.58 | 45.80 | 47.42 | 48.39 | 48.90 | 36.39 | 29.33 | 28.77 | 35.49 | |||||||||||||
1958 | 26.77 | 32.79 | 27.84 | 33.90 | 53.17 | h | 51.13 | 58.97 | 57.23 | 46.30 | 40.94 | 28.21 | a | 28.37 | a | 39.31 | a | |||||||||
1959 | 22.94 | 24.32 | 29.39 | 34.62 | a | 36.13 | 50.00 | 56.13 | ----- | z | 43.11 | b | 39.42 | l | 25.43 | b | ----- | z | 35.78 | c | ||||||
1960 | 19.57 | a | 26.45 | 30.68 | 34.21 | a | 36.68 | 45.83 | 57.16 | 48.41 | b | 49.17 | 40.32 | 29.80 | 22.03 | 36.69 | ||||||||||
1961 | 26.77 | 29.82 | 29.90 | 33.76 | a | 39.61 | 50.90 | 56.16 | 59.48 | 43.97 | 36.35 | 26.39 | b | 24.13 | 38.10 | |||||||||||
1962 | 21.81 | 28.14 | 27.87 | 36.23 | 36.97 | 43.90 | 49.48 | 49.39 | 47.90 | 38.18 | c | 31.10 | 27.71 | 36.56 | ||||||||||||
1963 | 14.80 | a | 31.50 | 28.35 | 31.63 | 37.73 | a | 42.48 | a | 45.52 | 52.81 | 50.77 | 39.13 | 30.53 | 22.48 | 35.64 | ||||||||||
1964 | 24.84 | 26.03 | 26.19 | 30.00 | 37.45 | 42.70 | 51.00 | a | 46.45 | 42.40 | 38.13 | 27.87 | 20.10 | 34.43 | ||||||||||||
1965 | 24.73 | a | 27.89 | 28.26 | 34.80 | 38.57 | a | 45.70 | 52.43 | a | ----- | z | 42.90 | 43.42 | 33.60 | 24.13 | 36.04 | a | ||||||||
1966 | 23.94 | 25.96 | b | 29.10 | 34.79 | b | 40.97 | 43.26 | c | 51.26 | 53.26 | 48.53 | 37.61 | 31.47 | 29.06 | 37.43 | ||||||||||
1967 | 29.03 | a | 29.18 | 27.81 | 30.00 | 40.48 | 49.87 | 51.94 | 58.06 | 52.03 | 38.26 | 30.52 | a | 24.07 | a | 38.44 | ||||||||||
1968 | 22.71 | 29.29 | a | 32.10 | 30.45 | a | 39.52 | ----- | z | 56.10 | 49.90 | 47.18 | b | 36.10 | a | 30.24 | a | 19.83 | a | 35.76 | a | |||||
1969 | 11.73 | a | 21.81 | a | 29.29 | 33.93 | a | 43.77 | 51.90 | a | 51.03 | 48.50 | a | 47.23 | 35.20 | a | 29.14 | a | 23.71 | 35.60 | ||||||
1970 | 22.50 | a | 29.32 | 29.13 | a | 30.24 | a | 38.52 | 51.20 | 54.10 | 52.00 | c | 38.73 | 34.81 | 29.62 | a | 21.55 | 35.98 | ||||||||
1971 | 26.52 | 24.86 | f | 26.17 | b | 31.24 | a | 39.29 | n | 42.62 | a | 56.06 | 56.70 | a | 40.69 | a | 35.84 | 28.90 | a | 20.97 | b | 36.57 | b | |||
1972 | 20.16 | 25.68 | a | 31.28 | b | 29.67 | c | 40.86 | c | 44.10 | a | 52.62 | b | 54.87 | a | 42.54 | d | 37.37 | d | 31.37 | c | 18.16 | 35.72 | |||
1973 | 19.81 | 27.81 | a | 30.24 | b | 33.57 | 40.11 | c | 42.96 | d | 51.22 | d | ----- | z | 47.64 | b | 36.96 | c | 27.57 | 28.73 | a | 35.15 | a | |||
1974 | 17.86 | c | 27.14 | g | 29.46 | e | 35.14 | a | 37.28 | b | 49.07 | a | 50.21 | c | 54.14 | b | 48.04 | b | 38.64 | c | 28.46 | d | 25.80 | a | 37.64 | a |
1975 | 22.37 | a | 22.89 | 27.60 | f | 29.31 | a | 38.03 | b | 43.20 | e | 56.35 | 47.72 | b | 47.88 | d | 36.00 | a | 26.96 | b | 26.21 | b | 36.09 | a | ||
1976 | 26.86 | c | 23.90 | 24.04 | f | 34.04 | b | 37.00 | j | 41.85 | c | 51.68 | f | 51.58 | 50.66 | a | 37.67 | a | 30.70 | 25.23 | 35.83 | c | ||||
1977 | 17.80 | a | 27.07 | a | 29.16 | 35.62 | a | 36.00 | b | 49.96 | b | 49.66 | b | 58.97 | a | 44.20 | 38.13 | a | 27.07 | b | 24.96 | c | 36.55 | |||
1978 | 25.68 | 28.50 | 33.39 | 34.84 | e | 37.52 | d | 47.59 | c | 53.71 | 51.65 | 44.62 | d | 37.77 | 21.97 | 19.14 | b | 36.36 | ||||||||
1979 | 9.76 | b | 26.28 | c | 32.10 | b | 34.23 | 41.84 | 46.07 | a | 52.97 | a | 52.87 | 49.27 | 40.60 | a | 25.57 | 27.57 | c | 36.59 | ||||||
1980 | 15.17 | b | 27.07 | a | 29.27 | a | 37.29 | b | 40.20 | a | 43.00 | 51.20 | a | 47.81 | 47.39 | b | 38.87 | 31.47 | 29.66 | b | 36.53 | |||||
1981 | 28.43 | a | 25.81 | b | 32.59 | b | 33.92 | f | 39.22 | d | 43.86 | a | 48.77 | 56.29 | 46.93 | c | 36.03 | b | 32.39 | b | 24.79 | b | 37.74 | a | ||
1982 | 21.26 | d | 23.31 | b | 28.60 | a | 29.86 | b | 38.50 | a | 49.76 | a | 51.11 | d | 52.00 | c | 45.07 | b | 35.00 | f | 26.00 | c | 23.31 | e | 35.34 | a |
1983 | 29.54 | e | 30.04 | d | 33.18 | c | 34.55 | a | 43.30 | a | 42.97 | 50.23 | a | 54.77 | 42.27 | 36.87 | h | 33.24 | e | 14.69 | b | 37.16 | a | |||
1984 | 24.31 | b | 27.39 | a | 33.06 | 31.42 | d | 37.23 | 43.70 | 53.67 | a | 52.16 | 44.30 | c | 33.58 | 29.29 | b | 19.94 | 35.84 | |||||||
1985 | 17.52 | 21.07 | 27.50 | a | 35.57 | 40.55 | 47.73 | 59.42 | 51.32 | 42.77 | 35.55 | 16.80 | 14.42 | 34.18 | ||||||||||||
1986 | 27.26 | 27.54 | 35.20 | a | 33.13 | 42.32 | 52.66 | a | 49.16 | 59.23 | 44.03 | 42.65 | 30.00 | 22.19 | 38.78 | |||||||||||
1987 | 22.55 | 28.75 | 33.19 | 39.00 | a | 44.77 | 50.77 | 51.93 | a | 54.48 | 51.70 | 42.53 | a | 32.83 | a | 21.55 | 39.50 | |||||||||
1988 | 21.81 | 28.32 | a | 30.87 | 37.89 | b | 39.81 | 47.43 | 54.23 | 54.13 | 48.37 | 46.32 | 31.80 | 24.26 | 38.77 | |||||||||||
1989 | 26.00 | 17.18 | 29.23 | 39.13 | 41.13 | 49.93 | 52.23 | 52.10 | 49.93 | 38.71 | 33.37 | 25.32 | 37.85 | |||||||||||||
1990 | 27.48 | 23.18 | 31.26 | 37.24 | a | 38.10 | ----- | z | 53.68 | 53.40 | a | ----- | z | 34.18 | c | 31.97 | 13.65 | 34.41 | b | |||||||
1991 | 21.03 | 31.79 | 28.73 | a | 33.40 | 37.23 | 41.48 | a | 52.35 | 54.97 | 48.70 | c | 37.70 | a | 30.32 | b | 27.23 | a | 37.08 | |||||||
1992 | 27.87 | a | 31.82 | a | 34.50 | a | 37.27 | 41.50 | a | 52.20 | ----- | z | 52.96 | c | 43.00 | a | 38.13 | a | 29.03 | a | 18.83 | b | 37.01 | a | ||
1993 | 15.83 | a | 18.72 | c | 30.33 | d | 33.48 | a | 44.65 | 44.11 | b | 45.97 | 50.77 | 46.13 | 39.71 | c | 20.96 | b | 24.94 | 34.63 | ||||||
1994 | 31.10 | b | 22.21 | 32.58 | 37.31 | a | 42.73 | a | 44.28 | a | ----- | z | 49.94 | 49.62 | a | 35.83 | a | ----- | z | 22.75 | c | 36.84 | b | |||
1995 | 25.64 | c | 29.52 | a | ----- | z | ----- | z | 42.45 | ----- | z | 51.90 | ----- | z | 50.10 | ----- | z | 33.28 | a | 25.19 | 36.87 | e | ||||
1996 | 22.90 | 20.54 | c | ----- | z | 35.50 | 36.68 | 42.45 | a | 54.50 | a | 51.94 | 42.53 | 36.39 | 27.59 | a | 21.24 | b | 35.66 | a | ||||||
1997 | 23.65 | 26.70 | a | ----- | z | 32.86 | a | 42.36 | c | 43.87 | ----- | z | ----- | z | ----- | z | 33.86 | c | ----- | z | 24.57 | a | 32.55 | e | ||
1998 | 24.34 | b | 29.89 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.93 | 33.43 | a | ----- | z | ----- | z | 32.65 | h | |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.79 | b | 20.90 | b | 21.84 | j |
2001 | 22.87 | a | 24.41 | a | 30.20 | a | 31.31 | d | 40.23 | 42.96 | e | 51.30 | a | 55.52 | 47.70 | g | 37.43 | c | 31.19 | c | 23.77 | a | 35.56 | a | ||
2002 | 26.15 | e | 26.21 | d | 26.46 | e | 33.86 | a | 36.81 | d | 47.31 | d | 50.52 | j | 46.26 | h | ----- | z | 33.07 | c | 29.47 | 27.27 | a | 31.85 | c | |
2003 | 29.24 | b | 27.30 | a | 33.85 | e | 32.61 | b | 39.43 | j | 47.35 | j | 58.00 | o | 54.46 | c | 46.65 | d | 37.50 | c | 26.14 | b | 25.67 | a | 34.82 | c |
2004 | 19.61 | c | 24.38 | e | 31.10 | b | 34.31 | a | 40.17 | a | 45.10 | 51.04 | f | 54.33 | a | 44.89 | c | 38.10 | a | 30.07 | a | 27.16 | 35.38 | a | ||
2005 | 23.77 | 23.08 | c | 30.17 | a | 35.03 | a | 42.54 | c | 43.29 | i | 51.40 | k | 51.56 | m | 41.38 | a | 35.85 | d | 26.54 | b | 19.84 | 30.91 | c | ||
2006 | 28.90 | b | 21.50 | d | 28.31 | b | 31.18 | h | 39.23 | i | 44.85 | d | 50.57 | c | 46.19 | d | 43.19 | c | 33.41 | b | 26.04 | e | 20.13 | 34.31 | b | |
2007 | 17.00 | a | 24.77 | b | 28.96 | f | 33.04 | f | 39.56 | m | 46.36 | p | 54.53 | n | 47.50 | q | 42.00 | w | 35.10 | j | 27.00 | i | 21.58 | g | 20.88 | j |
2008 | 17.12 | n | 26.28 | 26.30 | a | 29.27 | d | 42.35 | 42.38 | a | 54.39 | 55.25 | c | 48.76 | a | 37.73 | e | 32.90 | 18.19 | 37.62 | a | |||||
2009 | 22.45 | 25.11 | 25.06 | 33.67 | 38.87 | 47.53 | 55.39 | 56.52 | 47.43 | 34.61 | 28.72 | a | 19.35 | 36.23 | ||||||||||||
2010 | 29.06 | 30.75 | 29.90 | 34.03 | 40.06 | 46.80 | 55.61 | 55.74 | 48.67 | 39.48 | 27.10 | 24.39 | 38.47 | |||||||||||||
2011 | 26.45 | 21.93 | 30.03 | 31.20 | 37.13 | 41.83 | 46.39 | 50.06 | 48.73 | 37.52 | 23.53 | 22.23 | 34.75 | |||||||||||||
2012 | 23.29 | 24.21 | 26.84 | 36.03 | 39.19 | 43.40 | 54.06 | 55.23 | 51.21 | a | 38.06 | 31.23 | 25.42 | 37.35 | ||||||||||||
2013 | 19.77 | 28.71 | 31.55 | 34.87 | 42.10 | 46.63 | 57.03 | 56.71 | 50.73 | 36.10 | 29.13 | 22.71 | 38.00 | |||||||||||||
2014 | 24.29 | 21.79 | 31.06 | 35.60 | 42.14 | c | 46.93 | 59.39 | 57.68 | 50.83 | 44.23 | a | 28.73 | 26.19 | 39.07 | |||||||||||
2015 | 27.94 | 32.29 | 35.10 | 31.21 | k | 42.60 | a | 54.90 | 57.90 | 56.61 | 45.70 | 44.68 | 26.17 | 24.00 | 40.72 | a | ||||||||||
2016 | 25.97 | 31.83 | 31.84 | 40.17 | 43.39 | 44.20 | 52.13 | 54.19 | 42.80 | 36.97 | 34.10 | 16.45 | 37.84 | |||||||||||||
2017 | 12.52 | 21.46 | 30.90 | 30.80 | 39.19 | 45.30 | 54.74 | 58.53 | n | ----- | z | 37.00 | 29.40 | 21.19 | 32.25 | b | ||||||||||
2018 | 28.35 | 22.18 | 27.61 | 33.57 | 43.80 | f | 43.33 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.01 | g | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.93 | 25.59 | 29.93 | 34.23 | 40.46 | 46.11 | 52.98 | 53.28 | 46.97 | 38.25 | 29.00 | 23.59 | 37.10 | |||||||||||||
S.D. | 6.06 | 4.07 | 2.58 | 2.93 | 2.71 | 3.22 | 3.02 | 3.11 | 3.26 | 3.03 | 3.30 | 3.79 | 1.56 | |||||||||||||
SKEW | -1.08 | -0.49 | 0.35 | -0.05 | 0.19 | 0.53 | -0.15 | -0.20 | -0.14 | 0.46 | -0.82 | -0.38 | 0.46 | |||||||||||||
MAX | 31.19 | 32.79 | 37.03 | 42.97 | 46.58 | 54.90 | 59.42 | 59.48 | 55.40 | 46.32 | 34.14 | 31.29 | 41.42 | |||||||||||||
MIN | 3.71 | 15.63 | 23.63 | 25.10 | 35.43 | 40.30 | 45.52 | 46.19 | 38.73 | 32.10 | 16.80 | 13.65 | 34.18 | |||||||||||||
YRS | 84 | 84 | 81 | 83 | 81 | 81 | 76 | 70 | 79 | 79 | 80 | 84 | 46 |