YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1922 | ----- | z | ----- | z | ----- | z | ----- | z | 48.12 | k | 58.03 | 61.74 | 60.94 | 54.08 | 45.52 | 30.95 | 21.76 | 47.57 | e | |||||||
1923 | 28.35 | 19.70 | 34.55 | 42.70 | 48.84 | 53.27 | 62.19 | 59.23 | 55.22 | a | 45.56 | 39.21 | a | 26.52 | 42.94 | |||||||||||
1924 | 19.76 | 37.36 | 34.24 | 40.84 | a | 52.37 | a | 55.27 | 61.00 | 55.58 | 51.52 | 47.39 | 35.67 | a | 19.69 | 42.56 | ||||||||||
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.89 | c | 64.50 | 60.18 | 53.48 | 43.26 | 36.90 | a | 32.21 | 49.92 | e | |||||
1926 | 24.38 | a | 36.04 | 41.35 | a | 48.83 | 49.19 | 57.88 | 63.74 | 59.53 | 47.70 | 45.73 | 39.58 | 27.69 | b | 45.14 | ||||||||||
1927 | 24.76 | 33.14 | 36.21 | 41.67 | 46.02 | 56.90 | 61.19 | 60.02 | 52.09 | a | 47.03 | 39.70 | 18.92 | 43.14 | ||||||||||||
1928 | 26.40 | 27.05 | 38.92 | 40.85 | 50.85 | d | 54.20 | 63.58 | 58.24 | 52.30 | 44.56 | 36.88 | 23.61 | 43.12 | ||||||||||||
1929 | 14.35 | a | 18.71 | 35.11 | 38.83 | 48.47 | a | 54.15 | 60.79 | 62.73 | 48.82 | 45.47 | 31.13 | 33.95 | 41.04 | |||||||||||
1930 | 8.63 | 35.02 | a | 38.29 | 46.12 | 47.15 | 52.97 | 61.10 | 61.24 | 52.57 | 42.77 | 30.50 | a | 18.73 | a | 41.26 | ||||||||||
1931 | 25.74 | 29.02 | 36.32 | 42.87 | 51.61 | 54.63 | 62.00 | 60.03 | 51.28 | 43.08 | 28.85 | 20.08 | 42.13 | |||||||||||||
1932 | 19.05 | b | 21.14 | 34.87 | 42.72 | 47.56 | 55.97 | 59.11 | 57.56 | 51.83 | 44.52 | 38.36 | b | 19.97 | 41.06 | |||||||||||
1933 | 23.56 | 20.83 | a | 33.06 | 40.27 | 42.16 | 53.70 | 59.98 | 59.97 | 50.45 | 48.40 | 37.10 | 37.85 | 42.28 | ||||||||||||
1934 | 36.95 | 39.80 | 43.98 | 49.17 | 53.24 | 54.93 | 61.31 | 61.18 | 51.77 | 47.40 | 41.12 | 28.90 | 47.48 | |||||||||||||
1935 | 23.35 | a | 27.71 | 32.77 | 39.43 | 46.18 | 54.80 | 60.79 | 58.97 | 54.27 | 43.05 | 29.98 | 25.63 | 41.41 | ||||||||||||
1936 | 25.39 | 21.10 | 34.73 | 45.58 | 52.95 | 57.75 | 62.16 | 59.27 | 51.28 | 44.24 | 28.65 | 27.77 | 42.57 | |||||||||||||
1937 | 4.63 | 24.02 | 35.77 | 39.93 | 48.71 | 53.02 | 61.60 | 56.69 | 55.38 | 49.98 | 40.35 | 34.66 | 42.06 | |||||||||||||
1938 | 31.35 | 33.41 | 37.34 | 44.45 | 49.21 | 57.13 | 63.69 | 58.06 | 58.52 | 47.76 | 31.95 | 29.90 | 45.23 | |||||||||||||
1939 | 31.97 | 24.98 | 35.98 | a | 45.70 | 50.82 | 53.18 | 63.40 | 61.60 | 54.28 | 45.52 | 37.22 | 36.21 | 45.07 | ||||||||||||
1940 | 25.95 | 32.81 | 41.11 | 44.72 | 52.52 | 58.48 | 62.48 | 59.42 | 57.87 | 48.69 | 27.88 | 30.85 | 45.23 | |||||||||||||
1941 | 33.15 | 36.36 | 40.03 | 43.43 | 49.56 | 55.17 | 63.89 | 61.21 | 50.00 | 45.00 | 38.98 | 32.73 | 45.79 | |||||||||||||
1942 | 18.87 | 24.14 | 33.16 | 43.60 | 46.87 | 51.83 | 61.81 | 60.31 | 52.08 | 45.10 | 35.55 | 27.26 | 41.72 | |||||||||||||
1943 | 18.03 | 27.77 | 32.18 | 45.28 | 44.71 | 50.48 | 61.31 | 58.27 | 55.83 | 46.34 | 37.48 | 26.47 | 42.01 | |||||||||||||
1944 | 25.81 | 27.62 | 33.71 | 42.97 | a | 48.71 | 53.97 | 61.08 | 58.87 | 55.40 | 49.74 | 33.47 | 26.69 | 43.17 | ||||||||||||
1945 | 26.08 | 31.82 | 34.92 | 41.08 | 49.48 | 53.58 | 62.03 | 61.76 | 51.90 | 46.05 | 34.73 | 25.37 | 43.23 | |||||||||||||
1946 | 25.68 | 28.68 | 36.61 | 44.22 | 49.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.01 | g | |||||
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.52 | d | 57.88 | e | 50.78 | n | 43.75 | m | 33.37 | o | 14.43 | k | 58.20 | j |
1949 | 3.43 | d | 27.26 | e | 36.43 | d | 46.38 | e | 51.50 | d | 52.77 | o | 60.40 | p | 61.33 | s | 52.43 | p | ----- | z | 38.25 | l | 28.98 | c | 32.33 | f |
1950 | 17.15 | a | 28.04 | 32.98 | 41.37 | g | 46.78 | h | 54.56 | f | 62.32 | 62.18 | 54.07 | 48.47 | 38.37 | 36.89 | 42.27 | c | ||||||||
1951 | 23.34 | 31.45 | 32.35 | 43.57 | 50.23 | 54.70 | 63.18 | 59.66 | 55.13 | 44.11 | 34.73 | 24.45 | 43.08 | |||||||||||||
1952 | 20.29 | b | 24.91 | 32.40 | 45.98 | 49.53 | 54.57 | 62.47 | 61.26 | 57.07 | 49.79 | 29.58 | 26.50 | a | 42.86 | |||||||||||
1953 | 36.08 | a | 32.27 | 36.42 | 42.33 | 46.72 | a | 51.40 | 60.38 | c | 61.42 | 56.95 | 46.55 | a | 40.28 | 31.27 | a | 45.17 | ||||||||
1954 | 29.97 | 38.11 | 34.29 | 43.57 | 50.84 | b | 52.57 | 60.85 | 57.06 | 52.83 | 44.21 | 39.71 | f | ----- | z | 46.43 | b | |||||||||
1955 | ----- | z | ----- | z | ----- | z | 38.21 | a | 45.74 | 55.79 | a | 59.77 | 58.37 | d | 50.39 | g | 46.75 | c | 31.68 | e | 27.19 | b | 45.44 | d | ||
1956 | 26.63 | 21.05 | 33.76 | 43.95 | 52.06 | 54.08 | 63.66 | f | 59.58 | m | 54.77 | 43.16 | 32.28 | 30.61 | 39.24 | b | ||||||||||
1957 | 12.27 | 26.46 | 37.69 | 43.12 | 50.59 | c | 55.28 | e | 58.85 | 55.88 | s | 53.89 | g | 43.90 | 33.25 | 31.81 | 39.32 | b | ||||||||
1958 | 29.81 | 39.31 | a | 33.21 | 41.77 | b | 54.17 | j | 58.04 | b | 62.92 | k | ----- | z | ----- | z | 46.02 | e | 35.87 | 34.55 | 39.82 | d | ||||
1959 | 32.74 | 31.02 | e | ----- | z | ----- | z | ----- | z | 57.61 | p | 62.16 | 58.02 | 53.47 | 45.71 | b | 34.08 | 28.77 | 43.25 | d | ||||||
1960 | 19.07 | b | 26.87 | b | 37.59 | b | 43.09 | a | 46.87 | 54.69 | d | 63.12 | c | 57.45 | 53.70 | 43.86 | b | 34.70 | 27.60 | b | 42.38 | |||||
1961 | 30.45 | a | 38.11 | a | 38.05 | 41.65 | 46.97 | 59.63 | 62.67 | b | 64.61 | i | 50.17 | 44.11 | c | 30.33 | a | 28.27 | a | 42.76 | a | |||||
1962 | 23.90 | 30.31 | a | 32.90 | a | 46.66 | a | 47.55 | 53.67 | 60.26 | 60.58 | 56.43 | 46.93 | a | 38.52 | 32.37 | 44.17 | |||||||||
1963 | 20.07 | a | 41.00 | 37.84 | 40.32 | 49.89 | 55.05 | 58.64 | b | 61.29 | 59.98 | 48.82 | 38.41 | a | 28.55 | a | 44.99 | |||||||||
1964 | 28.66 | 28.69 | 34.79 | 41.34 | a | ----- | z | 50.88 | 62.35 | 58.93 | a | 52.57 | 48.17 | a | 34.37 | 29.02 | 42.71 | a | ||||||||
1965 | 28.55 | 35.05 | 36.44 | 46.18 | 48.92 | 57.82 | b | 62.90 | 62.47 | 49.86 | a | 49.27 | 40.24 | a | 27.58 | a | 45.44 | |||||||||
1966 | 30.19 | 29.12 | 38.45 | 44.42 | 51.53 | 55.15 | 59.73 | 60.82 | 56.85 | 44.65 | 39.84 | b | 31.77 | 45.21 | ||||||||||||
1967 | 32.68 | 34.52 | 35.71 | 39.20 | 48.35 | 56.67 | 62.81 | 65.52 | 59.12 | 45.56 | 35.85 | 25.11 | 45.09 | |||||||||||||
1968 | 26.66 | 37.39 | a | 40.63 | 40.22 | 49.02 | a | 56.19 | a | 63.10 | 59.26 | 54.19 | a | 42.85 | 35.52 | 27.08 | 44.34 | |||||||||
1969 | 22.50 | 26.93 | 33.77 | 43.98 | i | 50.79 | l | 59.25 | h | 59.88 | b | 58.81 | 54.57 | 38.87 | 35.67 | 30.71 | 40.19 | c | ||||||||
1970 | 26.23 | a | 35.29 | 33.79 | 35.75 | 47.74 | 59.55 | 63.52 | 61.39 | 48.95 | 43.18 | 36.91 | c | 22.34 | 42.89 | |||||||||||
1971 | 27.36 | b | 32.62 | 31.89 | 40.52 | 49.30 | a | 53.45 | 63.69 | 65.79 | b | 48.02 | 39.17 | a | 33.45 | 25.69 | d | 42.58 | ||||||||
1972 | 26.33 | e | 29.62 | 39.42 | 38.72 | 48.71 | 57.76 | a | 60.84 | 62.43 | a | 49.36 | a | 43.53 | b | 36.00 | a | 19.93 | a | 42.72 | ||||||
1973 | 23.60 | 31.50 | a | 36.10 | a | 38.83 | a | 48.65 | 56.53 | 61.10 | a | 60.05 | 53.73 | b | 43.81 | b | 34.71 | b | 34.73 | 43.61 | ||||||
1974 | 19.92 | e | 34.25 | 37.26 | 41.86 | a | 46.89 | 58.95 | 60.66 | 60.05 | b | 53.13 | 43.82 | 35.35 | 27.68 | c | 43.32 | |||||||||
1975 | 26.92 | 28.87 | a | 33.48 | a | 37.20 | 47.47 | 52.87 | 62.73 | a | 57.11 | 53.05 | a | 44.68 | 33.43 | a | 31.45 | a | 42.44 | |||||||
1976 | 25.53 | 29.06 | b | 32.90 | a | 40.68 | b | 48.79 | 51.97 | 61.02 | a | 58.34 | 54.92 | 43.77 | 38.10 | 27.98 | a | 42.75 | ||||||||
1977 | 18.94 | 35.04 | a | 33.29 | 44.25 | 45.37 | a | 58.03 | 60.11 | 63.92 | 51.17 | 45.05 | 33.81 | a | 32.50 | 43.46 | ||||||||||
1978 | 30.66 | 34.91 | a | 41.62 | a | 41.62 | 46.68 | a | 56.22 | 61.95 | 59.43 | a | 51.72 | 44.65 | a | 27.73 | 17.79 | c | 42.91 | |||||||
1979 | 10.61 | 28.46 | 36.58 | 42.80 | 50.13 | 55.43 | 62.65 | a | 62.60 | a | 56.52 | 48.23 | c | 31.17 | 31.90 | a | 43.09 | |||||||||
1980 | 24.33 | b | 35.32 | a | 35.57 | b | 45.47 | 49.45 | a | 52.03 | a | 61.73 | 55.87 | 53.16 | b | 45.82 | c | 36.32 | 31.93 | b | 43.92 | |||||
1981 | 33.78 | a | 32.43 | a | 37.53 | b | 42.47 | 48.90 | 53.68 | 58.48 | 62.63 | 53.20 | 42.57 | a | 37.41 | a | 31.06 | 44.51 | ||||||||
1982 | 24.66 | f | 26.16 | l | 34.58 | g | 38.18 | b | 45.15 | e | 58.02 | f | 61.17 | j | 60.33 | g | 50.74 | i | 43.38 | k | 31.56 | e | 25.72 | h | 38.30 | i |
1983 | 34.25 | m | 36.11 | j | 39.62 | e | 39.10 | e | 48.61 | d | 52.37 | d | 58.42 | f | 63.66 | c | 48.92 | j | 42.98 | k | 37.90 | j | 20.95 | i | 48.67 | g |
1984 | 23.37 | d | 28.83 | 36.81 | 40.64 | a | 46.28 | b | 54.10 | d | 61.07 | b | 62.20 | c | 49.83 | c | 40.48 | c | 34.21 | d | 20.17 | h | 43.44 | a | ||
1985 | 15.13 | e | 19.30 | c | 28.48 | c | 43.90 | e | 48.17 | d | 55.10 | a | 65.02 | 57.13 | e | 46.94 | d | 41.42 | f | 18.87 | g | 14.83 | d | 39.40 | b | |
1986 | 30.26 | d | 34.12 | c | 43.62 | e | 41.16 | b | 48.52 | e | 59.96 | c | 56.83 | d | 63.70 | c | 48.31 | c | 45.30 | c | 37.58 | f | 29.33 | b | 45.56 | a |
1987 | 20.41 | d | 29.65 | d | 40.89 | l | 47.03 | k | 50.86 | c | 57.77 | 60.63 | a | 58.42 | a | 55.45 | a | 45.38 | b | 36.45 | b | 28.71 | b | 44.37 | b | |
1988 | 25.34 | c | 31.98 | a | 36.68 | 45.40 | a | 49.24 | 56.28 | 61.65 | 59.27 | a | 51.96 | d | 51.31 | b | 34.84 | a | 22.34 | c | 43.86 | |||||
1989 | 21.38 | f | 18.17 | e | 35.69 | b | 45.21 | d | 48.00 | g | 56.52 | 60.18 | a | 59.22 | a | 52.26 | c | 42.17 | a | 36.32 | b | 29.40 | a | 43.51 | b | |
1990 | 30.65 | a | 28.05 | 37.02 | 45.12 | a | 45.83 | b | 54.05 | 61.29 | b | 61.11 | c | 56.02 | b | 42.90 | e | 36.95 | b | 19.31 | b | 43.19 | ||||
1991 | 21.20 | d | 38.44 | b | 35.08 | 40.77 | d | 46.85 | h | ----- | z | ----- | z | 61.75 | e | ----- | z | ----- | z | ----- | z | 34.42 | a | 38.61 | f | |
1992 | ----- | z | 37.96 | e | 40.76 | d | ----- | z | ----- | z | 58.98 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.36 | j |
1993 | ----- | z | ----- | z | ----- | z | 41.69 | a | 53.57 | b | 54.17 | 54.59 | b | 57.20 | a | 51.27 | 49.84 | b | 27.36 | i | 29.79 | j | 51.76 | e | ||
1994 | 33.62 | c | 27.82 | c | 39.40 | e | 44.41 | b | 50.15 | g | 54.69 | i | 62.78 | d | 60.67 | g | 56.46 | e | 43.16 | c | 29.17 | g | 26.50 | d | 41.77 | d |
1995 | 33.55 | i | 36.79 | i | 37.12 | e | 40.65 | d | 48.82 | a | 53.16 | a | 60.50 | g | 57.92 | k | 56.64 | b | 42.44 | d | 38.05 | h | 31.69 | b | 44.36 | e |
1996 | 28.74 | b | 27.33 | f | 39.87 | l | 43.60 | a | 45.61 | c | 53.64 | a | 63.35 | a | 61.81 | g | 49.96 | c | 43.31 | d | 37.93 | c | 28.61 | c | 43.86 | c |
1997 | 27.58 | f | 32.74 | a | 39.14 | i | 43.12 | b | 51.50 | g | 54.25 | d | 60.29 | c | 63.44 | e | 56.62 | d | 44.43 | h | 39.80 | j | 29.56 | e | 48.57 | e |
1998 | 30.40 | b | 34.65 | h | 40.22 | h | 42.74 | a | 48.75 | g | 54.71 | f | 63.11 | v | 62.26 | j | 58.64 | a | 43.55 | 36.35 | f | 26.65 | e | 40.40 | g | |
1999 | 31.85 | g | 29.76 | i | 36.94 | f | 38.95 | h | 45.20 | d | 54.58 | d | 58.12 | c | 63.43 | j | 50.85 | f | 44.62 | b | 42.22 | e | 31.48 | a | 46.04 | f |
2000 | 28.05 | b | 36.63 | f | 36.84 | f | 46.19 | c | 50.21 | c | 55.20 | c | 60.60 | b | 59.74 | j | 54.67 | f | 45.54 | c | 28.98 | f | 28.92 | g | 47.63 | f |
2001 | 26.06 | g | 30.56 | b | 37.19 | o | 41.30 | j | 49.45 | u | ----- | z | ----- | z | ----- | z | 58.71 | r | 47.39 | i | 39.66 | n | 32.80 | u | 30.56 | k |
2002 | 28.05 | u | 30.35 | r | 31.83 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.88 | r | ----- | z |
2003 | 35.41 | o | 31.50 | w | ----- | z | 42.25 | v | 49.89 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | 46.00 | s | 47.44 | v | 55.47 | o | 63.90 | j | 64.77 | i | 53.14 | p | ----- | z | 33.69 | v | 33.33 | y | ----- | z |
2005 | 29.63 | p | 30.05 | q | 35.86 | q | ----- | z | 50.29 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.92 | l | ----- | z |
2007 | 25.92 | g | 33.20 | e | 42.41 | b | 42.52 | d | 49.58 | f | 55.14 | w | 67.76 | h | 65.50 | y | ----- | z | 45.48 | d | 38.07 | w | 22.21 | x | 40.90 | h |
2008 | 25.58 | y | ----- | z | ----- | z | ----- | z | ----- | z | 54.80 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | 40.12 | w | 42.33 | i | 49.29 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | 42.82 | h | 44.40 | 53.16 | a | 59.70 | a | 58.05 | 53.95 | 46.13 | 37.00 | h | 29.61 | q | 52.56 | f | ||||
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 24.52 | 30.36 | 36.26 | 42.60 | 48.64 | 55.10 | 61.38 | 60.10 | 53.33 | 45.27 | 35.25 | 27.98 | 43.43 | |||||||||||||
S.D. | 6.93 | 5.54 | 3.07 | 2.69 | 2.34 | 2.23 | 1.83 | 2.22 | 2.95 | 2.46 | 3.50 | 4.92 | 1.41 | |||||||||||||
SKEW | -0.93 | -0.32 | 0.40 | -0.02 | -0.13 | 0.28 | -0.87 | 0.32 | 0.02 | 0.11 | -0.30 | -0.49 | 0.53 | |||||||||||||
MAX | 36.95 | 41.00 | 43.98 | 49.17 | 53.57 | 59.96 | 65.02 | 65.79 | 59.98 | 51.31 | 42.22 | 37.85 | 47.48 | |||||||||||||
MIN | 3.43 | 18.17 | 28.48 | 35.75 | 42.16 | 50.48 | 54.59 | 55.58 | 46.94 | 38.87 | 27.73 | 14.83 | 41.04 | |||||||||||||
YRS | 66 | 68 | 66 | 70 | 65 | 68 | 69 | 65 | 67 | 71 | 63 | 69 | 46 |