YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.87 | ----- | z | 22.73 | a | 31.30 | j | |
1925 | 30.64 | t | 33.61 | ----- | z | ----- | z | 38.86 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.61 | k | |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 37.48 | i | 41.86 | b | 45.66 | a | 49.05 | i | ----- | z | 45.00 | d | 41.83 | h | ----- | z | ----- | z | 44.17 | i |
1940 | ----- | z | 35.00 | j | ----- | z | 39.77 | 43.90 | a | 45.55 | a | 50.43 | a | 47.03 | a | 50.58 | k | 34.50 | y | 33.78 | u | 32.59 | b | 43.21 | f | |
1941 | 30.14 | c | 30.60 | c | 34.21 | c | 36.40 | e | 43.92 | g | 46.17 | l | 50.32 | 51.45 | b | 45.97 | a | 39.87 | ----- | z | ----- | z | 39.87 | d | ||
1942 | ----- | z | ----- | z | ----- | z | 38.33 | c | 40.08 | f | 45.82 | b | 52.21 | b | ----- | z | 43.78 | c | 39.30 | d | 32.68 | k | 32.45 | b | 41.98 | f |
1943 | 23.66 | b | 26.75 | d | 30.68 | f | 37.62 | i | 45.57 | j | 52.52 | e | 54.56 | d | 57.65 | 52.40 | 42.47 | l | 30.80 | o | 29.82 | c | 42.48 | e | ||
1944 | 26.67 | g | 29.63 | b | 29.93 | q | 37.06 | l | 40.68 | c | 46.38 | d | 48.39 | 49.29 | 45.31 | a | 40.75 | w | ----- | z | ----- | z | 43.28 | f | ||
1945 | 28.75 | g | 32.44 | j | 32.28 | m | 34.85 | d | 42.90 | 41.61 | l | 46.61 | 48.58 | ----- | z | 41.43 | x | 33.33 | o | 29.68 | i | 43.24 | h | |||
1946 | 31.60 | k | 31.05 | g | 33.33 | m | 35.00 | d | 39.00 | l | 46.12 | e | 51.74 | d | 52.00 | a | 43.52 | a | 36.14 | i | ----- | z | ----- | z | 45.68 | g |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.14 | i | 47.00 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.19 | n | 61.18 | i | 57.00 | f | 50.28 | l | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 43.07 | 49.10 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.08 | j | ||
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.89 | c | 59.63 | a | 44.62 | a | ----- | z | 34.42 | f | ----- | z | 55.38 | i |
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 | 36.13 | p | 31.68 | c | 33.26 | d | 35.89 | b | 40.44 | f | 45.81 | i | 50.81 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.61 | i |
1954 | 26.26 | l | 28.29 | 28.32 | 34.37 | 39.48 | 44.57 | 46.17 | a | 49.30 | a | 48.56 | n | 39.58 | e | 39.53 | m | 27.90 | u | 38.76 | d | |||||
1955 | 28.45 | i | 26.72 | j | 26.89 | l | 31.26 | k | 36.82 | n | ----- | z | 42.88 | e | 42.37 | a | ----- | z | ----- | z | 22.44 | l | 28.11 | c | 37.79 | i |
1956 | 28.28 | b | 21.30 | f | 27.94 | 33.30 | ----- | z | 45.93 | 49.34 | b | 48.84 | 42.50 | 39.16 | 28.42 | d | 29.77 | 37.35 | b | |||||||
1957 | 19.07 | b | 27.32 | 34.43 | c | 38.52 | a | 45.48 | 49.43 | b | 45.74 | 46.23 | 42.59 | a | 37.39 | 27.50 | b | 31.26 | 37.08 | |||||||
1958 | 30.59 | b | 35.79 | 29.69 | b | 35.33 | 42.90 | 52.00 | a | 51.84 | 46.48 | 46.41 | h | 36.23 | 32.55 | a | 33.43 | a | 38.80 | a | ||||||
1959 | 29.53 | a | 30.26 | a | 32.87 | 34.57 | 39.26 | 47.00 | d | 49.52 | b | 46.86 | c | 44.83 | g | 40.72 | b | 31.47 | 28.80 | a | 37.35 | a | ||||
1960 | 28.13 | a | 30.68 | a | 29.87 | 36.93 | a | 41.13 | 45.68 | e | 49.10 | 48.70 | h | 41.43 | b | 37.54 | c | 31.33 | f | 27.27 | a | 36.78 | b | |||
1961 | 29.23 | 34.74 | a | 33.31 | b | 36.90 | a | 39.33 | a | 46.80 | 49.71 | 47.97 | 40.13 | 34.37 | a | 25.36 | b | 29.10 | a | 37.25 | ||||||
1962 | 25.81 | 27.19 | a | 29.71 | 37.17 | 40.97 | a | 43.03 | 47.00 | 49.94 | 43.66 | a | 37.43 | c | 33.64 | e | 29.29 | j | 37.78 | a | ||||||
1963 | 20.83 | a | 33.21 | 30.74 | 37.40 | 39.87 | 46.54 | b | 49.06 | 50.03 | 44.96 | b | 38.70 | a | 34.04 | c | 27.65 | n | 38.67 | a | ||||||
1964 | 30.54 | c | 26.45 | 30.81 | 33.43 | 37.03 | a | ----- | z | 52.00 | c | 49.79 | b | 42.43 | b | 37.16 | f | 31.10 | a | 27.77 | 36.14 | b | ||||
1965 | 27.84 | 30.96 | a | 27.74 | 37.21 | a | 39.03 | 44.41 | a | 48.97 | 51.00 | 37.13 | 36.42 | 35.79 | a | 24.70 | a | 36.77 | ||||||||
1966 | 27.74 | 26.79 | 31.29 | 35.77 | 37.83 | a | 44.63 | 49.10 | 46.32 | 44.53 | 32.91 | i | 32.92 | d | 31.93 | a | 37.17 | a | ||||||||
1967 | 32.80 | a | 27.54 | 29.52 | 31.80 | 38.93 | a | 47.07 | 47.00 | 46.83 | a | 43.00 | 40.96 | e | ----- | z | 27.28 | m | 38.54 | b | ||||||
1968 | 28.68 | i | 30.95 | i | 33.57 | j | 33.68 | k | 40.62 | g | 47.07 | a | 48.84 | 48.74 | 44.27 | 36.63 | d | 31.11 | k | 27.40 | k | 45.11 | g | |||
1969 | 21.60 | k | 26.32 | i | 26.85 | k | 33.95 | j | 40.48 | f | 50.03 | 46.87 | 45.10 | 45.10 | 35.12 | e | 32.44 | n | 31.53 | l | 44.44 | g | ||||
1970 | 30.00 | l | 30.21 | i | 28.14 | i | 32.68 | h | 40.12 | f | 45.83 | 47.74 | 45.52 | 42.00 | 35.36 | c | 34.53 | k | 28.14 | j | 43.29 | g | ||||
1971 | 26.70 | k | 31.28 | j | 34.76 | n | 32.09 | g | 39.55 | k | 42.18 | h | 48.33 | a | 50.58 | 40.33 | 34.76 | j | 33.00 | j | 27.00 | n | 46.42 | i | ||
1972 | 25.57 | j | 26.55 | i | 32.96 | h | 34.15 | j | 39.20 | f | 46.36 | h | 48.61 | 47.84 | 39.37 | 32.37 | d | 31.65 | j | 22.13 | a | 38.06 | g | |||
1973 | 25.88 | e | 27.11 | i | 31.50 | i | 33.68 | b | 36.71 | 46.79 | a | 46.03 | 44.84 | 44.00 | 38.19 | 32.23 | 35.23 | 38.36 | b | |||||||
1974 | 24.77 | 31.21 | 32.68 | 36.13 | 39.77 | 44.83 | 49.68 | 48.26 | 41.24 | a | 32.90 | ----- | z | 31.81 | 37.57 | a | ||||||||||
1975 | 29.45 | 29.61 | 29.03 | 32.07 | 38.90 | 41.47 | 50.52 | 48.61 | 39.73 | 38.77 | 31.77 | 31.03 | 36.75 | |||||||||||||
1976 | 28.73 | a | 28.52 | 27.87 | 34.33 | 37.84 | 42.47 | 48.84 | 50.19 | 45.33 | 35.23 | a | 29.78 | c | 29.90 | 36.59 | ||||||||||
1977 | 22.84 | 31.68 | 32.13 | 35.50 | 40.39 | 47.17 | 49.77 | 53.32 | 44.20 | 36.77 | 32.10 | 32.39 | 38.19 | |||||||||||||
1978 | 31.97 | 33.86 | 34.10 | 37.33 | 40.74 | 48.70 | 52.29 | 51.81 | 46.20 | 36.65 | 27.87 | 25.32 | 38.90 | |||||||||||||
1979 | 23.68 | 29.07 | 32.42 | 37.37 | 42.68 | 47.80 | 52.81 | 52.16 | 47.63 | 40.19 | 30.23 | 33.84 | 39.16 | |||||||||||||
1980 | 22.19 | 30.38 | 33.94 | 37.77 | 43.32 | 47.43 | 51.58 | 49.10 | 46.03 | 38.61 | 36.33 | 33.47 | a | 39.18 | ||||||||||||
1981 | 33.68 | 30.57 | 35.03 | 38.20 | 43.35 | 47.57 | 53.19 | 54.96 | d | 47.13 | 36.42 | 34.17 | 31.68 | 40.50 | ||||||||||||
1982 | 28.77 | 28.50 | 31.29 | 33.14 | a | 41.06 | 51.50 | 52.68 | 54.13 | 46.87 | 39.10 | 29.97 | 29.03 | 38.84 | ||||||||||||
1983 | 31.97 | b | 33.75 | 36.16 | 34.77 | 44.58 | 49.41 | a | 52.84 | 57.10 | 44.20 | 37.52 | 37.17 | 24.55 | 40.33 | |||||||||||
1984 | 29.29 | 32.31 | 36.16 | 36.27 | 41.23 | 48.34 | a | 53.55 | 52.58 | 46.57 | 38.13 | 34.13 | 27.07 | a | 39.64 | |||||||||||
1985 | 23.23 | 26.36 | 30.97 | 36.52 | a | 43.93 | a | 48.40 | 56.16 | 51.13 | 43.87 | 38.68 | 26.10 | 23.16 | 37.37 | |||||||||||
1986 | 32.06 | 30.29 | 35.26 | 36.23 | 45.19 | 51.30 | 50.58 | 54.48 | 46.33 | 37.27 | a | 36.13 | 29.60 | a | 40.39 | |||||||||||
1987 | 26.73 | a | 32.71 | 34.87 | 36.93 | a | 42.94 | 47.53 | 51.26 | 49.29 | 44.80 | 32.81 | 36.73 | 27.68 | 38.69 | |||||||||||
1988 | 28.90 | 29.64 | a | 31.53 | a | 36.71 | b | 43.06 | 47.43 | 48.65 | 49.52 | 42.31 | a | 42.37 | a | 35.96 | b | 29.87 | a | 38.83 | ||||||
1989 | 31.57 | a | 24.50 | 33.42 | 36.87 | 41.45 | ----- | z | 51.39 | 50.45 | 40.60 | 37.74 | 34.86 | b | 30.65 | 37.59 | a | |||||||||
1990 | 32.48 | 27.39 | 33.20 | a | 39.00 | 43.07 | a | 48.47 | 53.03 | a | 52.42 | 48.93 | 38.68 | 36.60 | 23.00 | a | 39.69 | |||||||||
1991 | 27.00 | 33.14 | 32.58 | 35.10 | 43.32 | 47.10 | 52.32 | 52.61 | 44.13 | 36.53 | a | 36.83 | a | 33.21 | c | 39.49 | ||||||||||
1992 | 32.86 | b | 34.10 | 33.42 | 40.03 | 42.29 | 50.60 | 53.35 | 49.13 | 44.24 | a | 42.97 | a | 34.23 | 29.74 | 40.58 | ||||||||||
1993 | 25.67 | a | 27.36 | 34.94 | 39.10 | 46.03 | a | 48.40 | 51.52 | 50.00 | a | 41.27 | 40.29 | 27.37 | 28.39 | 38.36 | ||||||||||
1994 | 32.77 | 28.93 | 33.23 | a | 40.40 | 43.77 | 46.34 | a | 51.03 | a | 51.06 | 47.03 | 38.33 | a | 31.43 | 28.45 | b | 39.40 | ||||||||
1995 | 34.97 | a | 31.57 | 33.87 | 36.10 | 42.39 | 46.33 | 53.58 | 48.58 | 48.90 | 38.60 | a | 38.34 | a | 30.97 | b | 40.35 | |||||||||
1996 | 31.32 | 28.46 | a | 33.39 | 37.79 | b | 41.71 | 45.90 | 51.68 | 50.55 | 44.40 | 39.77 | 34.43 | 30.94 | 39.19 | |||||||||||
1997 | 30.26 | 30.11 | a | 33.27 | a | 36.21 | b | 43.10 | a | 48.23 | 51.00 | 52.10 | 47.86 | a | 39.33 | a | 36.43 | 30.48 | 39.87 | |||||||
1998 | 30.94 | 34.50 | 34.90 | 37.90 | 45.03 | a | 49.24 | a | 55.87 | a | 52.06 | 45.39 | b | 39.74 | 37.32 | b | 29.48 | 41.03 | ||||||||
1999 | 32.00 | 32.04 | 32.42 | 33.23 | 38.68 | 47.14 | b | 49.00 | 52.97 | a | 43.00 | 36.48 | b | 37.21 | a | 31.21 | b | 38.78 | ||||||||
2000 | 29.97 | 32.66 | 33.45 | 38.20 | 42.97 | 46.86 | a | 50.84 | ----- | z | 46.97 | 40.67 | a | 29.07 | 30.97 | a | 38.42 | a | ||||||||
2001 | 32.14 | c | 28.43 | 33.68 | 35.80 | 41.45 | b | 46.90 | 51.32 | 52.81 | 46.33 | 38.29 | c | 36.20 | 30.30 | a | 39.47 | |||||||||
2002 | 32.25 | c | 30.46 | 31.52 | b | 37.33 | 41.48 | 47.43 | 51.93 | a | 49.81 | 43.40 | 36.39 | c | 34.48 | a | 31.94 | 39.04 | ||||||||
2003 | 34.52 | 31.18 | 35.94 | 37.70 | 42.24 | b | 48.77 | 49.84 | 49.06 | 47.62 | a | 42.75 | c | 31.28 | a | 32.63 | a | 40.29 | ||||||||
2004 | 29.10 | a | 32.59 | 35.84 | 37.57 | 45.10 | a | 48.59 | a | 55.10 | 54.13 | a | 48.70 | 41.18 | c | 34.00 | b | 34.86 | b | 41.40 | ||||||
2005 | 32.93 | b | 28.32 | 36.00 | 39.52 | a | 48.10 | a | 50.83 | 53.32 | 51.39 | 45.17 | 44.68 | 32.83 | 31.71 | 41.23 | ||||||||||
2006 | 34.82 | c | 28.86 | 33.29 | 36.83 | 42.42 | 49.93 | 53.45 | 50.52 | 45.23 | 38.55 | 35.77 | 30.87 | a | 40.04 | |||||||||||
2007 | 27.27 | a | 33.54 | 37.17 | a | 39.03 | 42.68 | 49.43 | 57.03 | a | 54.45 | 47.43 | 40.94 | 34.59 | a | 32.32 | 41.32 | |||||||||
2008 | 28.32 | 31.83 | 33.16 | 34.67 | 44.23 | 46.83 | 52.81 | 54.29 | 45.63 | 39.90 | 40.07 | 29.10 | 40.07 | |||||||||||||
2009 | 29.94 | 29.86 | 32.90 | 36.80 | 42.69 | b | 50.70 | 54.45 | 53.23 | 47.63 | 41.39 | 36.43 | 26.61 | 40.22 | ||||||||||||
2010 | 36.74 | 34.36 | 35.03 | 37.53 | 40.55 | b | 47.30 | 52.23 | 54.29 | 51.47 | 41.58 | 33.50 | 32.45 | 41.42 | ||||||||||||
2011 | 30.94 | 28.50 | 33.32 | 34.70 | 40.52 | 47.57 | 49.06 | 52.03 | 47.70 | 42.32 | 32.23 | 27.58 | 38.87 | |||||||||||||
2012 | 29.23 | 32.83 | 32.77 | 38.73 | 41.06 | 47.17 | 53.90 | 52.58 | 44.67 | 38.74 | 36.23 | 32.84 | 40.06 | |||||||||||||
2013 | 26.55 | 32.07 | 32.52 | 36.97 | 43.35 | 49.00 | 53.03 | 55.65 | 52.57 | 37.39 | 34.53 | 28.16 | 40.15 | |||||||||||||
2014 | 31.74 | 31.68 | 37.58 | 39.93 | 47.23 | 49.57 | 56.77 | 56.84 | 50.53 | 47.52 | 36.43 | 37.03 | 43.57 | |||||||||||||
2015 | 32.81 | 38.25 | 37.68 | 39.43 | 47.68 | 53.50 | 55.10 | 53.61 | 48.90 | 47.26 | 35.73 | 33.68 | 43.64 | |||||||||||||
2016 | 31.58 | 35.76 | 36.97 | 40.83 | 45.77 | 49.63 | 54.35 | 50.77 | 45.53 | 44.45 | 41.03 | 27.10 | 41.98 | |||||||||||||
2017 | 23.68 | 30.79 | 36.58 | 39.77 | 44.29 | 51.00 | 51.81 | 51.74 | 47.90 | 36.55 | 37.13 | 30.06 | 40.11 | |||||||||||||
2018 | 34.94 | 32.46 | 33.42 | 38.40 | 46.55 | 48.93 | 52.77 | 52.97 | 44.60 | 39.48 | 37.20 | 33.13 | 41.24 | |||||||||||||
2019 | 31.00 | 28.14 | 30.81 | 40.10 | 45.58 | 49.57 | 52.73 | a | 53.48 | 49.23 | 38.00 | 33.57 | 35.16 | 40.61 | ||||||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 29.35 | 30.71 | 33.04 | 36.78 | 42.27 | 47.66 | 51.19 | 50.88 | 45.12 | 38.82 | 33.77 | 30.04 | 39.69 | |||||||||||||
S.D. | 3.74 | 2.73 | 2.45 | 2.10 | 2.58 | 2.35 | 3.03 | 3.20 | 3.03 | 2.95 | 3.42 | 3.21 | 1.57 | |||||||||||||
SKEW | -0.60 | 0.20 | -0.28 | -0.25 | 0.05 | -0.05 | 0.30 | 0.07 | 0.08 | 0.55 | -0.50 | -0.52 | 0.13 | |||||||||||||
MAX | 36.74 | 38.25 | 37.68 | 40.83 | 48.10 | 53.50 | 61.89 | 59.63 | 52.57 | 47.52 | 41.03 | 37.03 | 43.64 | |||||||||||||
MIN | 19.07 | 24.50 | 27.74 | 31.80 | 36.71 | 41.47 | 42.88 | 42.37 | 37.13 | 32.37 | 25.36 | 22.13 | 36.59 | |||||||||||||
YRS | 61 | 63 | 61 | 66 | 63 | 68 | 75 | 71 | 69 | 65 | 56 | 62 | 46 |