YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | ----- | z | 28.39 | 35.32 | 35.57 | 45.61 | 51.63 | 61.66 | 55.58 | 48.80 | ----- | z | 35.37 | 29.85 | 42.78 | b | ||||||||||
1938 | 26.81 | 25.68 | 28.31 | 36.91 | c | 45.17 | d | 53.81 | a | 59.57 | b | 55.27 | e | 54.02 | f | 41.73 | c | 27.07 | j | 27.52 | c | 40.08 | b | |||
1939 | 23.72 | d | 24.07 | e | 31.00 | g | 42.95 | a | 46.30 | h | 48.24 | i | 58.40 | e | 58.78 | a | 50.25 | f | 41.42 | e | 34.74 | g | 29.83 | d | 39.88 | e |
1940 | 27.48 | f | 29.50 | c | 35.38 | f | 42.73 | 52.45 | 58.24 | a | 58.14 | j | 60.98 | 51.80 | c | 44.38 | e | 32.27 | o | 29.55 | 46.20 | d | ||||
1941 | 28.02 | 31.86 | 38.06 | 39.93 | 47.45 | 50.42 | 60.50 | a | 57.48 | 46.55 | 41.55 | 36.63 | 28.05 | 42.21 | ||||||||||||
1942 | 25.18 | 25.29 | 31.95 | 39.57 | 42.84 | 50.48 | 59.94 | 59.03 | 51.55 | 42.95 | 31.65 | 28.05 | 40.71 | |||||||||||||
1943 | 23.02 | 29.50 | 32.27 | 42.02 | 42.82 | 47.78 | 58.79 | 54.85 | 55.75 | 41.48 | 36.43 | 28.10 | 41.07 | |||||||||||||
1944 | 21.84 | 26.47 | 32.23 | 37.37 | 45.95 | 49.43 | a | 58.00 | 54.89 | 51.95 | 46.55 | 31.53 | a | 26.39 | 40.22 | |||||||||||
1945 | 28.34 | 31.39 | a | 31.04 | g | 35.42 | j | 46.20 | a | 52.00 | b | 62.11 | 59.50 | a | 50.90 | 46.24 | 31.05 | 25.85 | a | 43.36 | b | |||||
1946 | 22.05 | a | 26.00 | 32.47 | 41.42 | 47.48 | 51.12 | 58.74 | 59.55 | b | 49.38 | 36.55 | a | 31.60 | 31.03 | 40.62 | ||||||||||
1947 | 24.44 | 34.73 | 37.45 | 41.22 | 50.79 | 49.09 | a | 56.69 | 54.73 | 50.17 | 43.88 | a | 31.57 | 27.52 | a | 41.86 | ||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.97 | a | 53.89 | 48.27 | 41.66 | 31.03 | 19.02 | 41.64 | f | |||||
1949 | 13.35 | 25.30 | 32.77 | 41.88 | 48.31 | 52.24 | a | 57.03 | 55.18 | 51.25 | 37.10 | 37.18 | 21.65 | 39.44 | ||||||||||||
1950 | 19.03 | l | ----- | z | ----- | z | ----- | z | 53.50 | x | 53.67 | 60.81 | 59.55 | 52.18 | 44.07 | a | 37.12 | 36.58 | 49.14 | e | ||||||
1951 | 24.68 | a | 31.77 | 30.70 | a | 43.69 | a | ----- | z | 58.76 | a | 59.81 | w | 59.81 | r | 54.90 | 42.23 | 32.80 | 23.00 | a | 38.06 | c | ||||
1952 | 22.08 | 27.12 | 29.65 | 41.78 | 48.00 | 51.57 | 61.77 | 58.24 | 56.70 | 48.79 | 28.55 | 26.44 | 41.72 | |||||||||||||
1953 | 32.32 | a | 31.84 | 32.77 | 38.22 | a | 41.85 | 48.37 | 60.68 | 56.31 | 56.03 | 42.56 | 37.78 | 30.07 | a | 42.40 | ||||||||||
1954 | 27.53 | 34.30 | 30.10 | 41.20 | 50.19 | 50.86 | a | 58.66 | 53.87 | 49.39 | b | 42.48 | a | 38.47 | a | 28.13 | 42.10 | |||||||||
1955 | 24.10 | 26.12 | 30.40 | 34.02 | 45.11 | 55.19 | a | 55.93 | a | 58.92 | 50.95 | 44.83 | a | 31.75 | 27.97 | 40.44 | ||||||||||
1956 | 26.87 | a | 24.28 | 31.81 | 41.33 | 49.08 | 50.16 | a | 60.71 | 55.92 | a | 51.17 | 41.23 | 33.18 | 30.05 | 41.31 | ||||||||||
1957 | 17.58 | 31.55 | 34.89 | 39.95 | 46.75 | a | 55.30 | 56.97 | 53.65 | 53.90 | 40.94 | 30.42 | 31.20 | a | 41.09 | |||||||||||
1958 | 28.44 | 34.48 | 30.56 | 37.93 | a | 52.47 | a | 54.71 | a | 62.07 | b | 61.97 | 50.38 | 45.44 | 36.20 | 34.55 | 44.10 | |||||||||
1959 | 30.19 | 29.93 | 35.92 | 43.02 | 42.95 | 53.78 | a | 62.02 | 55.79 | b | 49.43 | 44.94 | 36.10 | 25.92 | 42.50 | |||||||||||
1960 | 24.34 | 27.33 | 35.13 | a | 39.48 | 43.82 | a | 55.70 | 64.11 | 55.50 | 53.80 | 44.19 | 32.95 | 27.68 | 42.00 | |||||||||||
1961 | 30.52 | 32.52 | 33.34 | 40.80 | 45.56 | 59.87 | 61.44 | 62.45 | 49.05 | 43.56 | 32.68 | 27.23 | 43.25 | |||||||||||||
1962 | 24.60 | 29.23 | 32.11 | 43.55 | 43.42 | 52.93 | 57.73 | 55.90 | 54.28 | 43.71 | 36.72 | 31.19 | 42.11 | |||||||||||||
1963 | 26.11 | 38.55 | 34.48 | 34.57 | 49.68 | 52.75 | 56.77 | 57.87 | 55.80 | 44.15 | 33.55 | 31.06 | 42.95 | |||||||||||||
1964 | 26.02 | 26.97 | ----- | z | 37.45 | 45.27 | 51.93 | 60.42 | 57.23 | 50.77 | 46.71 | 31.27 | 27.47 | 41.95 | a | |||||||||||
1965 | 29.39 | 32.46 | a | 35.45 | 41.72 | 45.52 | 54.28 | 60.18 | 57.90 | 48.24 | a | 47.15 | 35.00 | a | 25.33 | a | 42.72 | |||||||||
1966 | 26.00 | a | 27.07 | 33.21 | 41.37 | 50.35 | 52.33 | a | 57.50 | 59.44 | 54.63 | 44.60 | a | 35.97 | 29.60 | 42.67 | ||||||||||
1967 | 29.74 | b | 31.07 | 31.21 | 33.28 | 47.55 | 55.52 | 62.61 | 64.18 | 57.52 | b | 44.02 | c | 36.17 | 23.90 | e | 43.06 | |||||||||
1968 | 26.98 | 34.45 | a | 35.53 | 37.55 | 45.47 | 54.28 | a | 62.19 | 55.18 | 52.59 | b | 42.70 | a | 32.95 | a | 24.37 | 42.02 | ||||||||
1969 | 23.55 | a | 26.12 | 31.90 | 37.50 | a | 51.19 | 56.29 | b | 59.10 | 57.45 | 52.48 | a | 39.23 | 36.43 | 29.87 | 41.76 | |||||||||
1970 | 28.35 | 32.59 | 34.23 | 34.27 | 47.67 | a | 56.88 | 61.52 | 59.71 | 48.50 | 40.95 | 34.62 | 23.57 | a | 41.90 | |||||||||||
1971 | 27.02 | a | 28.66 | 29.52 | a | 37.05 | 47.18 | 51.82 | 61.42 | 62.19 | 49.08 | 41.31 | 33.12 | 22.74 | 40.92 | |||||||||||
1972 | 22.79 | 29.79 | 36.34 | 36.68 | 49.66 | 55.65 | 61.77 | 60.58 | a | 48.93 | 42.97 | a | 31.11 | c | 21.02 | 41.44 | ||||||||||
1973 | 21.32 | 30.38 | 31.85 | 40.88 | b | 50.31 | 54.47 | 60.26 | 59.03 | 53.75 | 41.92 | 30.79 | a | 30.07 | a | 42.08 | ||||||||||
1974 | 22.00 | 26.93 | 31.69 | 36.92 | 44.26 | 58.08 | 60.24 | 60.39 | 55.43 | a | 43.84 | 34.80 | c | 27.27 | 41.82 | |||||||||||
1975 | 26.05 | 27.09 | a | 30.24 | 33.38 | 45.48 | 50.85 | 61.45 | 55.73 | 55.58 | 41.58 | a | 30.60 | 30.45 | 40.71 | |||||||||||
1976 | 27.42 | 28.26 | 31.26 | 36.17 | a | 48.89 | 49.93 | 59.53 | 54.92 | 53.65 | 45.15 | 37.82 | 24.47 | 41.46 | ||||||||||||
1977 | 22.63 | 32.70 | 31.79 | 42.76 | a | 41.55 | 57.88 | 59.33 | a | 62.50 | 50.63 | 44.65 | 33.34 | a | 28.76 | 42.38 | ||||||||||
1978 | 31.82 | 30.50 | 39.41 | b | 38.54 | b | 44.31 | 53.83 | 60.34 | b | 58.74 | 48.71 | b | 46.11 | 27.34 | a | 19.03 | a | 41.56 | |||||||
1979 | 18.75 | a | 30.12 | 37.08 | 38.62 | 49.60 | a | 54.60 | 60.31 | 57.85 | 56.25 | 47.82 | a | 31.74 | a | 28.97 | b | 42.64 | ||||||||
1980 | 24.59 | b | 34.28 | 34.10 | 41.60 | a | 45.32 | a | 49.97 | 62.26 | 56.53 | 54.30 | 45.52 | a | 35.76 | a | 29.73 | 42.83 | ||||||||
1981 | 32.42 | 32.16 | c | 36.28 | a | 42.73 | 45.98 | a | 55.76 | c | 58.94 | 61.82 | 53.00 | 43.23 | a | 38.43 | 28.15 | g | 45.52 | a | ||||||
1982 | 22.55 | b | 26.92 | b | 32.06 | o | 34.74 | k | 47.22 | m | 56.14 | h | 59.34 | b | 60.23 | k | 52.00 | m | 42.79 | j | 29.07 | j | 25.50 | l | 36.27 | i |
1983 | 29.82 | k | 30.44 | j | 35.43 | j | 36.62 | i | 49.45 | l | 50.82 | h | 58.87 | l | 59.37 | 50.81 | f | 43.98 | j | 33.47 | n | 26.07 | k | 59.37 | k | |
1984 | 27.44 | m | 30.50 | n | 36.67 | k | 36.19 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.45 | t | 29.98 | b | 20.57 | h | 29.98 | k |
1985 | 26.18 | 28.46 | b | 29.67 | a | 40.64 | i | 47.52 | b | 56.27 | f | 64.17 | a | 56.40 | a | 48.52 | b | 43.38 | f | 26.96 | r | 25.50 | m | 42.99 | e | |
1986 | 31.61 | q | 31.12 | l | 38.33 | p | 39.58 | k | 47.25 | m | 58.88 | e | 57.50 | d | 64.15 | e | 49.15 | f | 46.00 | k | 33.39 | p | 27.66 | o | 60.18 | i |
1987 | 24.28 | m | 30.91 | l | 35.16 | l | 48.95 | i | 52.06 | f | 57.44 | c | 56.73 | 59.83 | a | ----- | z | 50.35 | a | 40.53 | k | 28.91 | n | 56.09 | h | |
1988 | 26.04 | s | 29.72 | t | 37.39 | q | 45.64 | s | 46.10 | p | 53.47 | l | 63.06 | e | 60.25 | a | 53.68 | b | 51.83 | b | 32.53 | l | 25.07 | j | 57.20 | h |
1989 | 27.88 | o | 22.61 | j | 34.65 | k | 45.63 | k | 45.55 | i | 55.80 | e | 58.67 | b | 56.32 | a | 53.57 | 44.69 | d | 36.13 | k | 32.62 | n | 53.81 | g | |
1990 | 27.53 | o | 26.39 | i | 35.62 | o | 46.76 | m | ----- | z | 54.13 | g | 62.77 | c | 60.44 | 57.37 | 44.54 | c | ----- | z | ----- | z | 56.28 | h | ||
1991 | 28.91 | n | ----- | z | 30.29 | q | 37.71 | k | ----- | z | ----- | z | 62.96 | h | 62.00 | i | 58.77 | h | 47.14 | i | 36.36 | p | 29.60 | p | ----- | z |
1992 | ----- | z | 36.77 | r | ----- | z | ----- | z | 54.66 | i | 55.86 | e | ----- | z | 60.05 | u | ----- | z | ----- | z | ----- | z | 19.42 | s | 55.86 | k |
1993 | 16.81 | w | 22.88 | p | 37.65 | n | 39.50 | o | 50.06 | m | 50.71 | m | 52.50 | m | 57.21 | c | 53.82 | 48.80 | d | 25.64 | e | 27.47 | p | 46.37 | h | |
1994 | 28.75 | m | 27.03 | j | 39.44 | m | 39.19 | v | ----- | z | 51.83 | g | 66.56 | n | 62.50 | x | 57.70 | j | 43.00 | d | 24.67 | c | 22.42 | y | 33.83 | j |
1995 | 29.21 | x | 33.62 | l | 34.11 | m | 39.94 | m | 46.78 | d | 53.83 | c | 59.02 | d | 58.37 | e | ----- | z | 41.91 | c | 39.61 | b | 34.88 | o | 49.92 | f |
1996 | 28.02 | 32.52 | i | 36.23 | i | 41.54 | b | 44.55 | a | 54.74 | a | 63.73 | 60.92 | 50.12 | 42.13 | 35.30 | 28.03 | 44.91 | b | |||||||
1997 | 25.19 | 29.20 | 36.66 | 39.02 | a | 51.50 | d | 51.92 | 59.79 | ----- | z | 53.32 | 43.47 | a | 35.30 | 24.53 | a | 40.90 | a | |||||||
1998 | 31.42 | 30.52 | 35.02 | 39.71 | a | 42.94 | 52.76 | a | 64.06 | 62.63 | 56.68 | 41.64 | c | 32.75 | 22.81 | 42.74 | ||||||||||
1999 | 26.87 | a | 26.75 | 32.26 | 36.90 | 44.34 | b | 52.10 | a | 58.98 | 59.92 | 54.22 | a | 45.19 | 37.35 | 28.32 | a | 41.93 | ||||||||
2000 | 26.46 | g | 32.60 | n | 32.13 | h | 43.36 | b | 46.00 | n | 56.18 | h | 59.15 | n | 60.41 | i | 55.32 | p | 42.10 | k | 29.00 | f | 27.40 | f | 43.36 | k |
2001 | 27.64 | b | 28.72 | a | 36.73 | a | 37.55 | a | 52.74 | d | 51.71 | a | 59.62 | a | 62.86 | c | 54.27 | d | 45.57 | a | 35.05 | a | 26.76 | h | 44.77 | a |
2002 | 26.40 | f | 30.10 | h | 31.98 | a | 42.12 | b | 46.06 | 56.98 | e | 64.89 | h | 56.78 | f | 53.85 | g | 41.65 | a | 34.61 | b | 30.30 | a | 40.53 | e | |
2003 | 33.04 | d | 30.66 | 36.78 | d | 37.27 | 47.55 | b | 57.26 | c | 65.65 | a | 61.55 | i | 55.75 | h | 46.60 | f | 30.15 | f | 29.35 | 42.19 | d | |||
2004 | 28.90 | a | 28.70 | b | 39.91 | i | 43.02 | d | 46.98 | d | 55.21 | a | 62.71 | b | 60.12 | n | 50.83 | a | 43.80 | c | 32.93 | a | 30.28 | d | 42.34 | b |
2005 | 27.98 | 30.36 | 38.79 | b | 39.87 | 48.45 | b | 49.54 | c | 62.54 | f | 60.54 | f | 52.98 | h | 43.07 | d | 32.66 | b | 24.60 | a | 37.26 | c | |||
2006 | 27.12 | a | 26.12 | b | 29.07 | d | 39.76 | e | 48.57 | d | 56.62 | b | 64.66 | i | 58.70 | d | 54.00 | g | 42.96 | c | 32.41 | a | 25.71 | 38.71 | b | |
2007 | 24.16 | f | 31.24 | a | 39.08 | 38.96 | c | 49.46 | d | 54.52 | 65.35 | 60.06 | f | 51.05 | a | 40.41 | d | 34.19 | d | 23.23 | a | 42.75 | b | |||
2008 | 20.22 | f | 28.71 | a | 31.18 | 35.41 | h | 47.93 | b | 52.02 | b | 61.96 | d | 60.33 | e | 53.85 | c | 43.19 | g | 37.31 | c | 23.93 | d | 44.14 | c | |
2009 | 27.91 | c | 28.84 | 31.55 | a | 38.23 | 49.50 | a | 53.64 | a | 62.75 | c | 58.75 | a | 55.15 | d | 40.76 | b | 31.90 | 22.03 | a | 41.75 | ||||
2010 | 33.08 | a | 31.57 | 34.05 | a | 35.97 | 41.68 | 51.13 | 60.76 | 57.47 | 52.12 | b | 45.35 | 30.07 | a | 28.18 | a | 41.79 | ||||||||
2011 | 26.23 | 26.61 | 32.65 | 34.63 | 41.61 | 51.00 | j | 56.08 | m | 60.26 | j | 56.11 | l | 42.74 | b | 31.07 | 26.08 | 32.70 | d | |||||||
2012 | 28.16 | 28.90 | 31.29 | 40.18 | 45.97 | 50.15 | 59.26 | 60.63 | 54.95 | 42.50 | 35.05 | 27.05 | a | 42.01 | ||||||||||||
2013 | 23.02 | 29.57 | 36.11 | 39.60 | 47.42 | 54.28 | 64.18 | 59.52 | a | 51.88 | 39.11 | 34.23 | 22.77 | 41.81 | ||||||||||||
2014 | 30.58 | 30.93 | 36.31 | 39.47 | 47.97 | 52.13 | 64.32 | 61.65 | a | 54.48 | 45.47 | a | 32.55 | 31.82 | 43.97 | |||||||||||
2015 | 33.32 | a | 36.25 | 39.76 | 38.90 | 46.88 | b | 59.48 | 60.58 | 59.45 | 50.95 | 47.38 | a | 29.98 | 24.48 | a | 43.95 | |||||||||
2016 | 24.74 | 31.81 | b | 32.84 | c | 43.05 | b | 49.88 | j | ----- | z | 54.69 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.43 | g | ||
2017 | ----- | z | ----- | z | 35.62 | a | 37.65 | 46.02 | j | 54.81 | a | 62.59 | c | 63.35 | d | 59.08 | j | 41.68 | i | 33.23 | d | 27.55 | a | 44.97 | e | |
2018 | 33.33 | e | 28.89 | j | 32.89 | i | 39.98 | f | 51.19 | g | 53.55 | h | 61.66 | l | 57.77 | i | 50.38 | 43.10 | 33.83 | 27.16 | l | 40.16 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 26.36 | 29.68 | 33.58 | 39.31 | 46.87 | 53.69 | 60.42 | 58.57 | 52.37 | 43.62 | 33.50 | 27.16 | 41.95 | |||||||||||||
S.D. | 3.95 | 3.02 | 2.84 | 2.78 | 2.83 | 2.88 | 2.41 | 2.70 | 2.67 | 2.71 | 3.02 | 3.45 | 0.99 | |||||||||||||
SKEW | -0.48 | 0.43 | 0.35 | -0.33 | 0.05 | 0.14 | -0.05 | 0.09 | -0.01 | 0.32 | -0.44 | -0.13 | -0.02 | |||||||||||||
MAX | 33.33 | 38.55 | 39.76 | 43.69 | 52.74 | 59.87 | 65.65 | 64.18 | 57.52 | 51.83 | 39.61 | 36.58 | 44.10 | |||||||||||||
MIN | 13.35 | 24.07 | 28.31 | 33.28 | 41.55 | 47.78 | 54.69 | 53.65 | 46.55 | 36.55 | 24.67 | 19.02 | 39.44 | |||||||||||||
YRS | 61 | 63 | 59 | 63 | 62 | 67 | 68 | 66 | 63 | 69 | 66 | 63 | 43 |