YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | 43.62 | p | 45.18 | 49.09 | a | ----- | z | 61.07 | 64.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.99 | h | |||
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.30 | b | ----- | z | 43.30 | k |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.55 | a | 62.07 | 50.92 | 43.52 | 41.63 | a | 51.74 | g | |||
1958 | 43.00 | 47.11 | 44.05 | 49.12 | a | 59.58 | a | 65.88 | a | 67.45 | 64.60 | 59.22 | 53.60 | 42.86 | a | 44.29 | b | 53.40 | ||||||||
1959 | 40.39 | 41.80 | a | 43.66 | 49.72 | 53.15 | 58.48 | 64.65 | 60.90 | b | 58.08 | 52.02 | a | 44.67 | 40.42 | 50.66 | ||||||||||
1960 | 38.21 | 42.54 | b | 44.11 | 48.75 | 52.15 | 58.55 | b | 63.81 | 61.77 | 57.23 | 52.10 | 44.50 | 42.77 | 50.54 | |||||||||||
1961 | 43.22 | a | 41.62 | 41.79 | 44.82 | b | 51.10 | 59.00 | 61.35 | 63.37 | 54.80 | 46.76 | b | 38.63 | 38.05 | 48.71 | ||||||||||
1962 | 36.29 | b | 41.94 | a | 39.98 | b | 48.30 | 48.36 | b | 56.10 | a | 59.86 | b | 59.60 | 58.07 | a | 50.69 | 44.47 | 41.00 | 48.72 | ||||||
1963 | 34.26 | 46.93 | 42.65 | a | 47.45 | 52.95 | 56.02 | a | 59.03 | b | 61.47 | 60.57 | 51.97 | a | 42.78 | 40.12 | a | 49.68 | ||||||||
1964 | 38.32 | 39.59 | b | 40.87 | a | 44.00 | 49.65 | a | 55.36 | a | 58.85 | a | 58.68 | 55.03 | a | 50.55 | 40.14 | a | ----- | z | 48.28 | a | ||||
1965 | 35.53 | 39.56 | a | 43.61 | 47.03 | a | ----- | z | ----- | z | 61.95 | ----- | z | ----- | z | ----- | z | ----- | z | 37.58 | 44.21 | f | ||||
1966 | 36.57 | c | 39.21 | b | 41.98 | 47.91 | a | 52.84 | 55.72 | 59.88 | a | 61.34 | 59.03 | 49.52 | 44.18 | 41.60 | b | 49.15 | ||||||||
1967 | 40.57 | b | 40.66 | 39.38 | b | 43.52 | 51.63 | 60.00 | a | 61.15 | 65.58 | a | 60.60 | 49.98 | a | 43.72 | 37.19 | 49.50 | ||||||||
1968 | 37.18 | 42.97 | 43.77 | 44.57 | 52.12 | b | 56.02 | 61.87 | 59.56 | 56.98 | a | 47.39 | 43.66 | a | 35.18 | 48.44 | ||||||||||
1969 | 29.74 | b | 35.50 | 41.65 | a | 45.12 | 54.73 | a | 60.05 | 59.48 | 58.02 | 56.32 | 47.45 | 43.28 | 40.82 | 47.68 | ||||||||||
1970 | 39.07 | b | 43.12 | 42.66 | 43.18 | 50.34 | 58.95 | 59.76 | 59.60 | a | 53.19 | a | 47.29 | 42.32 | 35.29 | b | 47.90 | |||||||||
1971 | 36.32 | a | 38.92 | b | 37.77 | 44.57 | a | 52.03 | 52.07 | 60.76 | 62.45 | 53.55 | a | 46.81 | 42.68 | 34.82 | 46.90 | |||||||||
1972 | 34.03 | 38.09 | 42.19 | 41.25 | 53.19 | 56.27 | 60.82 | a | 62.31 | 53.10 | a | 47.34 | 42.90 | 34.92 | a | 47.20 | ||||||||||
1973 | 36.02 | a | 39.98 | 41.53 | 45.87 | 51.90 | 55.10 | a | 59.65 | a | 57.29 | 56.63 | 47.60 | 38.37 | 40.56 | 47.54 | ||||||||||
1974 | 35.27 | 38.43 | 40.55 | 44.43 | 46.73 | 56.10 | 58.13 | 61.31 | 59.78 | 48.89 | 42.78 | 39.69 | 47.67 | |||||||||||||
1975 | 36.15 | 36.57 | 39.08 | 41.32 | 49.50 | 53.74 | a | 60.39 | 57.21 | 56.58 | 47.42 | 41.37 | 37.37 | 46.39 | ||||||||||||
1976 | 38.08 | 37.07 | 37.68 | 43.80 | 50.34 | 52.45 | 58.19 | 57.97 | 58.00 | 49.74 | 42.97 | 39.32 | 47.13 | |||||||||||||
1977 | 34.94 | 42.00 | 39.40 | 46.82 | 47.97 | 56.15 | 57.68 | 63.10 | 54.45 | 47.92 | 39.42 | 38.63 | 47.37 | |||||||||||||
1978 | 41.35 | 42.68 | 45.05 | 46.55 | 50.42 | 59.75 | 62.26 | 60.89 | 54.93 | 51.11 | 38.52 | 33.77 | 48.94 | |||||||||||||
1979 | 33.26 | 37.80 | 45.16 | 46.77 | 53.68 | 56.53 | 61.29 | 60.65 | 59.07 | 51.47 | a | 41.13 | 41.56 | 49.03 | ||||||||||||
1980 | 33.11 | 40.40 | 41.00 | 47.53 | 51.26 | 53.27 | 60.19 | 57.90 | 56.20 | 50.16 | 44.28 | 41.77 | 48.09 | |||||||||||||
1981 | 41.06 | 40.62 | 44.61 | 45.30 | 50.77 | 53.52 | a | 59.10 | a | 63.87 | 56.63 | 47.60 | 43.80 | 38.34 | 48.77 | |||||||||||
1982 | 34.81 | 38.04 | 40.35 | 42.73 | 50.67 | a | 59.48 | 58.60 | 60.48 | 57.87 | 49.39 | 38.87 | 37.16 | 47.37 | ||||||||||||
1983 | 40.97 | 42.48 | a | 44.98 | 46.83 | 54.79 | 55.57 | 59.10 | 61.66 | 54.22 | 47.25 | a | 44.74 | a | 33.13 | a | 48.81 | |||||||||
1984 | 39.19 | 40.05 | a | 44.11 | 43.97 | a | 47.87 | 54.71 | a | 59.85 | 59.69 | 54.75 | 46.56 | 41.45 | a | 34.05 | 47.19 | |||||||||
1985 | 35.03 | 37.20 | 40.48 | b | 46.67 | a | 52.37 | 56.88 | b | 64.58 | 61.74 | 54.88 | a | 48.26 | 35.22 | 33.06 | 47.20 | |||||||||
1986 | 41.98 | e | 40.05 | 46.97 | 44.92 | 51.83 | b | 59.04 | c | 57.83 | a | 65.38 | b | 56.04 | c | 53.06 | 43.29 | b | 39.20 | a | 49.97 | |||||
1987 | 38.35 | 42.43 | a | 44.89 | 49.70 | 53.89 | 58.66 | a | 59.32 | 62.45 | a | 58.78 | a | 51.65 | 45.02 | 36.08 | a | 50.10 | ||||||||
1988 | 37.97 | a | 42.52 | 43.03 | b | 48.47 | a | 51.65 | 55.72 | 61.31 | 61.45 | b | 55.80 | 53.38 | b | 43.23 | b | 38.82 | a | 49.44 | ||||||
1989 | 38.32 | a | 33.89 | a | 40.48 | 49.95 | 52.78 | a | 58.11 | b | 59.15 | a | 60.19 | 59.05 | 50.27 | a | 44.09 | a | 40.70 | a | 48.91 | |||||
1990 | 40.20 | a | 35.56 | b | 44.95 | 49.02 | d | 51.76 | 56.93 | b | 64.50 | 64.18 | a | 61.20 | 47.89 | 43.94 | c | 33.38 | b | 49.46 | ||||||
1991 | 37.25 | c | 45.25 | 41.55 | a | 46.28 | 50.79 | 54.66 | a | 62.65 | 61.94 | 59.57 | a | 49.71 | 44.55 | a | 41.18 | 49.61 | ||||||||
1992 | 41.29 | c | 44.83 | 49.58 | a | 49.03 | a | 56.65 | a | 61.12 | 63.00 | 62.71 | 55.95 | 51.07 | a | 42.80 | 36.02 | a | 51.17 | |||||||
1993 | 33.09 | b | 39.94 | a | 44.84 | 47.00 | a | 56.89 | 57.27 | 58.33 | a | 62.48 | 59.13 | 52.05 | a | 38.92 | 38.27 | 49.02 | ||||||||
1994 | 42.78 | b | 37.75 | 46.23 | 49.35 | 53.72 | b | 55.62 | a | 61.91 | c | 61.58 | 59.55 | 48.58 | 38.32 | 38.16 | c | 49.46 | ||||||||
1995 | 42.11 | 42.85 | a | 43.74 | 47.08 | 55.38 | a | 58.31 | a | 62.94 | 59.16 | 60.57 | 49.02 | 45.88 | 39.98 | 50.59 | ||||||||||
1996 | 38.79 | 40.43 | 45.13 | a | 48.32 | 49.27 | 56.28 | 63.72 | a | 62.98 | a | 55.80 | 48.87 | a | 41.70 | 36.72 | b | 49.00 | ||||||||
1997 | 39.48 | a | 40.29 | 42.27 | a | 45.81 | a | 55.81 | 55.97 | a | 61.13 | a | 64.06 | 59.22 | 49.74 | 46.17 | 38.87 | 49.90 | ||||||||
1998 | 39.78 | a | 42.84 | 44.76 | 47.78 | 52.62 | a | 57.43 | 63.75 | a | 62.81 | 59.80 | 49.85 | a | 44.62 | 36.60 | a | 50.22 | ||||||||
1999 | 40.37 | 38.32 | 40.77 | 46.17 | a | 48.97 | 54.88 | 59.63 | 62.29 | 57.33 | 48.52 | 44.85 | 39.87 | a | 48.50 | |||||||||||
2000 | 35.79 | 41.10 | 42.65 | 49.58 | 50.77 | a | 57.62 | a | 61.09 | b | 60.39 | d | 56.73 | f | 49.53 | a | 40.40 | e | 38.24 | 47.92 | a | |||||
2001 | 39.62 | a | 38.58 | c | 43.57 | a | 45.88 | f | 51.85 | h | 54.54 | e | 58.98 | g | 60.80 | d | 57.48 | d | 49.61 | i | 43.69 | c | 37.05 | i | 48.32 | e |
2002 | 39.00 | e | 39.81 | b | 38.75 | k | 46.58 | q | 49.98 | h | 56.00 | j | 62.38 | e | 61.31 | g | 56.81 | a | 49.11 | c | 44.06 | c | 39.44 | f | 48.53 | f |
2003 | 43.00 | a | 39.54 | a | 43.74 | d | 44.94 | e | 50.50 | g | 59.33 | c | 60.67 | m | 59.05 | j | 57.64 | b | 51.61 | c | 39.96 | d | 38.27 | a | 46.45 | c |
2004 | 37.71 | c | 40.96 | c | 44.52 | d | 50.02 | h | 50.00 | j | 55.13 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.06 | i |
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 38.06 | 40.42 | 42.83 | 46.45 | 52.02 | 56.98 | 61.04 | 61.33 | 57.37 | 49.59 | 42.47 | 38.28 | 48.88 | |||||||||||||
S.D. | 3.09 | 2.79 | 2.43 | 2.29 | 2.60 | 2.59 | 2.22 | 2.07 | 2.26 | 1.92 | 2.38 | 2.77 | 1.39 | |||||||||||||
SKEW | -0.32 | 0.16 | 0.04 | -0.37 | 0.51 | 0.76 | 0.65 | -0.09 | -0.02 | 0.27 | -0.96 | -0.18 | 0.67 | |||||||||||||
MAX | 43.22 | 47.11 | 49.58 | 49.95 | 59.58 | 65.88 | 67.45 | 65.58 | 62.07 | 53.60 | 46.17 | 44.29 | 53.40 | |||||||||||||
MIN | 29.74 | 33.89 | 37.68 | 41.25 | 46.73 | 52.07 | 57.68 | 57.21 | 53.10 | 46.56 | 35.22 | 33.06 | 46.39 | |||||||||||||
YRS | 47 | 47 | 47 | 45 | 42 | 45 | 45 | 44 | 45 | 45 | 47 | 44 | 40 |