YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.54 | q | 54.83 | a | 46.92 | a | 27.98 | a | 23.24 | b | 38.24 | h |
1932 | 19.37 | 23.54 | d | 33.92 | a | 44.66 | a | 51.21 | 59.46 | b | 66.19 | 62.93 | a | 56.80 | 44.33 | b | 39.24 | a | 16.80 | i | 45.60 | a | ||||
1933 | 21.34 | 17.37 | b | 32.17 | b | 40.87 | 46.15 | a | 60.23 | f | 66.26 | 61.69 | 56.11 | k | ----- | z | ----- | z | 36.33 | h | 40.83 | e | ||||
1934 | 34.83 | b | 38.50 | a | 46.07 | a | 48.90 | 55.48 | a | 57.67 | 71.82 | ----- | z | 52.53 | o | 49.21 | 39.43 | 21.47 | 46.34 | b | ||||||
1935 | 24.09 | b | 21.26 | a | 24.79 | 42.40 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.47 | b | 27.78 | a | 25.85 | 28.04 | f | ||
1936 | 22.81 | 24.65 | c | 34.29 | c | 42.15 | m | ----- | z | ----- | z | ----- | z | ----- | z | 50.69 | n | ----- | z | 33.02 | 29.13 | 28.78 | g | |||
1937 | 7.83 | b | 23.42 | b | 36.72 | a | ----- | z | ----- | z | 55.33 | c | 67.67 | a | 63.61 | m | 60.89 | b | 47.70 | a | 43.33 | 29.77 | c | 41.41 | c | |
1938 | 28.38 | r | ----- | z | ----- | z | 39.43 | w | ----- | z | ----- | z | 70.70 | p | 69.69 | o | 69.53 | l | ----- | 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 | ----- | z | ----- | z | ----- | z |
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 | 28.87 | a | 46.57 | 51.73 | a | 56.98 | 66.47 | a | 65.61 | 59.22 | 50.73 | 29.25 | 29.44 | g | 50.60 | c | ||||||
1953 | 36.02 | b | 31.09 | a | 37.08 | a | 41.60 | 46.00 | p | 52.61 | c | 67.33 | b | 62.67 | e | 59.06 | f | 45.07 | j | 39.98 | f | 26.67 | d | 44.38 | d | |
1954 | 30.68 | 36.45 | h | 34.02 | f | 44.77 | b | 54.93 | d | 56.45 | b | 69.21 | c | 61.72 | f | 56.11 | c | 44.48 | f | 41.07 | b | 25.22 | a | 47.30 | d | |
1955 | 18.61 | 21.94 | b | 28.83 | a | 38.05 | a | 48.31 | e | 60.45 | 64.02 | e | 70.28 | b | 65.27 | h | 46.68 | q | 32.38 | 29.87 | d | 41.27 | b | |||
1956 | 29.21 | e | 21.58 | c | 34.46 | c | 44.72 | c | 54.59 | b | 58.30 | b | 69.23 | g | 63.46 | e | 57.86 | b | 43.62 | g | 30.71 | f | 27.71 | e | 43.54 | c |
1957 | 17.18 | 29.30 | 37.47 | 41.39 | b | 50.57 | d | 59.50 | f | 65.88 | f | 64.94 | g | 60.66 | e | 45.18 | c | 33.24 | c | 31.26 | b | 38.47 | c | |||
1958 | 26.23 | e | 37.46 | c | 34.62 | b | 42.55 | b | 57.30 | a | 59.46 | e | 66.74 | j | 70.39 | d | 56.09 | c | 50.12 | c | 35.87 | c | 36.93 | c | 46.09 | a |
1959 | 32.54 | c | 30.80 | a | 36.94 | 45.77 | b | 46.52 | c | 62.92 | d | 70.02 | a | 66.44 | d | 54.80 | e | 47.45 | c | 36.41 | c | 27.81 | b | 46.53 | ||
1960 | 21.84 | b | 25.85 | b | 37.96 | f | 44.38 | d | 50.10 | g | 63.29 | f | 73.22 | f | 63.61 | d | 59.54 | c | 45.60 | f | 35.53 | a | 28.62 | c | 39.91 | e |
1961 | 30.56 | 34.85 | d | 37.50 | c | 42.78 | e | 52.70 | h | 66.14 | a | 70.36 | b | 71.86 | b | 53.07 | c | 45.13 | d | 33.82 | h | 26.26 | f | 50.25 | c | |
1962 | 20.90 | b | 30.22 | a | 33.47 | b | 47.46 | c | 48.94 | g | 59.34 | b | 64.93 | c | 63.52 | f | 59.52 | h | 47.15 | d | 37.56 | e | 32.80 | d | 41.54 | c |
1963 | 23.57 | d | 39.04 | d | 36.92 | g | 36.25 | l | 53.69 | g | 55.80 | e | 64.38 | a | 67.19 | b | 63.52 | c | 52.02 | c | 37.35 | 28.18 | a | 47.90 | c | |
1964 | 23.55 | a | 23.21 | a | 28.95 | c | 40.85 | 48.57 | a | 56.47 | 67.31 | 64.02 | c | 54.26 | c | 49.48 | 33.60 | a | 29.76 | 43.34 | ||||||
1965 | 26.90 | 34.00 | b | 34.85 | ----- | z | 48.15 | a | 57.68 | 66.13 | a | 63.95 | b | 50.70 | 50.82 | 39.98 | a | 29.18 | a | 45.67 | a | |||||
1966 | 27.97 | a | 26.94 | c | 38.52 | a | 44.85 | 56.64 | b | 58.91 | a | 67.34 | c | 66.47 | b | 59.96 | d | 47.12 | b | 38.98 | b | 30.38 | a | 47.01 | ||
1967 | 30.86 | f | 34.33 | a | 37.34 | b | 37.93 | c | 50.66 | b | 57.93 | a | 70.83 | b | 71.82 | c | 61.73 | d | 46.54 | c | 37.32 | 24.76 | 48.29 | a | ||
1968 | 25.61 | h | 39.35 | b | 40.12 | a | 39.52 | 50.61 | c | 59.87 | c | 70.14 | c | 61.81 | 56.30 | b | 47.20 | d | 37.50 | h | 26.72 | a | 49.16 | b | ||
1969 | 29.41 | b | 29.48 | 34.86 | b | 44.04 | b | 54.45 | b | 59.07 | a | 68.10 | a | 67.72 | a | 59.14 | a | 41.35 | 35.74 | a | 31.02 | b | 46.20 | |||
1970 | 31.07 | a | 36.34 | 34.74 | 37.05 | a | 50.95 | 60.52 | 68.31 | 68.43 | b | 52.20 | b | 42.23 | a | 37.27 | 25.50 | 45.38 | ||||||||
1971 | 29.90 | 32.43 | a | 33.08 | a | 42.43 | 51.29 | 55.97 | 66.98 | 70.42 | e | 51.71 | f | 42.80 | a | 34.18 | b | 22.89 | 43.85 | a | ||||||
1972 | 23.18 | 32.38 | 40.13 | a | 41.40 | 52.72 | b | 60.58 | 65.40 | 66.89 | 53.24 | a | 46.68 | c | 34.50 | b | 23.38 | b | 45.04 | |||||||
1973 | 24.76 | b | 33.46 | 35.25 | c | 41.50 | a | 53.23 | 60.45 | 69.05 | a | 65.95 | b | 56.76 | a | 46.29 | 35.03 | a | 32.05 | 46.15 | ||||||
1974 | 24.60 | 31.39 | 36.98 | a | 42.47 | 46.44 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.55 | a | ----- | z | 34.40 | g | |||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | 47.85 | h | 57.08 | d | 69.69 | 62.33 | h | 57.19 | a | 43.71 | 31.57 | 28.90 | 48.02 | f | ||||
1976 | ----- | z | ----- | z | 27.21 | 42.12 | 55.03 | a | 57.50 | a | 69.61 | h | 61.10 | a | 59.12 | d | 47.89 | 37.88 | i | 30.15 | 47.51 | d | ||||
1977 | 21.60 | b | 34.94 | a | 33.17 | b | 47.59 | a | 46.06 | d | 65.66 | b | 67.63 | e | 67.60 | a | 55.12 | e | 47.34 | f | 36.80 | c | 32.62 | b | 46.25 | a |
1978 | 31.48 | a | 31.52 | d | 42.36 | b | 43.04 | b | 47.89 | i | 58.82 | s | 68.06 | f | 61.52 | d | 55.21 | a | 50.32 | c | 32.21 | a | 22.02 | a | 41.07 | c |
1979 | 15.68 | 31.10 | b | 38.05 | a | 42.09 | b | 52.21 | g | 61.33 | g | 68.65 | 65.05 | a | 62.44 | f | 51.05 | c | 30.03 | 32.35 | g | 42.71 | d | |||
1980 | 26.86 | f | 36.07 | b | ----- | z | 47.37 | c | 48.08 | e | 55.63 | d | 67.15 | a | 62.10 | a | 58.73 | 51.72 | b | 39.76 | a | 34.12 | a | 50.07 | b | |
1981 | 29.87 | a | 31.98 | 38.47 | a | 46.88 | b | 48.98 | d | 58.85 | 67.14 | c | 70.40 | 58.77 | d | 44.02 | 39.90 | e | 31.73 | k | 48.66 | a | ||||
1982 | 24.83 | d | 28.95 | 35.88 | a | 36.91 | b | 43.50 | v | 60.38 | 65.97 | 67.18 | a | 58.31 | l | 44.12 | a | 29.15 | c | 25.44 | e | 41.88 | b | |||
1983 | 32.04 | e | 34.43 | g | 39.06 | f | 38.10 | e | 50.70 | a | 58.06 | d | 66.32 | c | 68.36 | c | 55.31 | a | 49.42 | e | 37.53 | 22.45 | c | 47.83 | b | |
1984 | 20.34 | b | 27.27 | a | 37.37 | d | 41.18 | b | 52.58 | g | 55.76 | c | 70.33 | e | 70.83 | e | 52.92 | l | 35.83 | j | ----- | z | 23.19 | e | 43.28 | d |
1985 | 20.91 | d | 24.35 | b | 32.39 | c | 40.00 | r | 52.86 | c | 62.93 | c | 72.78 | d | 63.18 | f | 50.69 | f | 41.14 | f | 25.82 | b | 20.98 | e | 39.13 | d |
1986 | 34.00 | e | 36.12 | c | 43.71 | c | 43.77 | d | 51.63 | a | 64.21 | d | 64.83 | k | 72.35 | g | 54.50 | h | 45.79 | j | ----- | z | ----- | z | 45.57 | f |
1987 | 24.14 | b | 34.07 | a | 38.76 | b | 52.00 | k | 55.25 | e | 63.29 | w | 65.42 | f | ----- | z | ----- | z | 51.52 | b | 35.67 | c | 24.88 | k | 39.90 | f |
1988 | 24.79 | b | 34.24 | b | 36.81 | b | 46.60 | d | 51.52 | b | 62.80 | h | 70.43 | j | 67.57 | a | 58.28 | c | 57.00 | d | 33.59 | h | 24.41 | h | 47.10 | d |
1989 | 23.05 | c | 22.06 | b | 40.07 | d | 48.52 | b | 51.74 | f | 63.19 | d | 72.30 | d | 64.13 | h | 59.35 | j | 48.46 | g | 35.29 | k | 30.34 | l | 44.87 | f |
1990 | 31.48 | a | 28.05 | 40.25 | c | 50.75 | f | 50.02 | b | 61.62 | i | ----- | z | 68.35 | h | 64.63 | g | 47.55 | i | 38.05 | h | 19.29 | 33.82 | g | ||
1991 | 25.90 | e | 38.58 | c | 36.29 | 41.16 | e | 46.69 | g | 55.59 | b | 71.31 | b | 70.82 | c | 61.46 | g | 48.28 | b | 36.20 | j | 30.77 | c | 46.52 | c | |
1992 | 29.85 | d | 38.85 | b | 44.23 | g | 49.73 | 59.70 | d | 64.40 | d | 66.44 | d | 71.29 | e | ----- | z | 52.00 | c | 29.85 | f | 24.62 | g | 54.03 | d | |
1993 | 21.77 | e | 26.12 | d | 39.46 | d | 42.73 | b | 56.81 | e | 56.59 | a | 59.30 | d | 64.53 | b | 58.95 | i | 48.48 | e | 30.52 | j | 29.95 | a | 44.57 | b |
1994 | 32.98 | b | 29.87 | e | 43.23 | 47.62 | a | 53.93 | h | 63.89 | c | 73.23 | e | 70.90 | f | 62.71 | i | 47.25 | e | 29.17 | c | 26.22 | f | 45.90 | d | |
1995 | 32.23 | e | 40.57 | n | 37.93 | a | 43.21 | d | 51.53 | b | 58.10 | 67.59 | c | 67.24 | f | 62.74 | i | 47.74 | j | 43.19 | i | 30.04 | g | 48.43 | f | |
1996 | 29.26 | f | 30.89 | a | 40.08 | e | 45.35 | c | 51.29 | c | 62.44 | c | 72.24 | b | 69.62 | e | 56.44 | d | 45.35 | e | 39.80 | o | 32.14 | f | 52.63 | c |
1997 | 29.89 | c | 33.00 | b | 41.37 | d | 43.57 | c | 56.40 | a | 60.11 | g | 68.48 | d | 69.19 | e | 62.30 | b | 46.63 | d | 40.07 | g | 27.83 | e | 47.87 | b |
1998 | 35.82 | a | 33.26 | a | 38.30 | c | 43.05 | b | 48.80 | c | 56.45 | b | 72.23 | e | 71.81 | d | 61.74 | g | 46.98 | j | 38.04 | d | 29.82 | q | 48.64 | c |
1999 | 28.38 | s | 31.17 | d | 39.43 | b | 41.83 | 48.12 | e | 60.32 | b | 68.21 | c | 68.87 | a | 59.10 | d | 50.46 | c | 42.39 | h | 28.50 | i | 51.95 | c | |
2000 | 30.85 | a | 37.48 | d | 38.16 | c | 49.95 | b | 53.60 | 63.78 | a | 70.81 | e | 70.83 | b | 57.90 | i | 45.95 | b | 27.40 | f | 27.19 | j | 51.27 | c | |
2001 | ----- | z | 28.94 | c | 40.02 | b | 46.39 | k | 61.86 | m | 64.00 | l | 71.75 | g | 74.75 | c | 63.48 | g | 51.25 | e | 40.52 | j | 27.30 | i | 48.74 | h |
2002 | 25.83 | h | 31.15 | b | 35.64 | c | 44.36 | h | 51.30 | f | 63.42 | e | 74.24 | d | 65.81 | e | 59.54 | d | 45.43 | j | 37.82 | h | 32.56 | m | 54.97 | f |
2003 | 36.68 | f | 31.57 | e | 40.00 | d | 41.41 | h | 55.33 | d | 63.20 | c | 75.65 | 71.39 | i | 63.29 | k | 57.00 | l | ----- | z | ----- | z | 53.15 | g | |
2004 | ----- | z | 29.71 | o | 40.74 | n | 47.68 | e | 52.83 | m | 61.38 | m | 71.70 | f | 68.04 | h | 56.46 | q | ----- | z | ----- | z | ----- | z | 47.68 | k |
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 |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.00 | n | 34.45 | b | 29.06 | d | 31.75 | j |
2020 | 29.87 | e | 29.86 | a | 37.16 | f | 40.89 | l | 52.54 | d | 56.98 | f | ----- | z | ----- | z | ----- | z | 48.33 | y | ----- | z | ----- | z | 37.42 | i |
2021 | ----- | z | 29.55 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 26.30 | 30.67 | 36.60 | 43.54 | 51.96 | 59.46 | 68.54 | 67.14 | 57.36 | 47.74 | 35.07 | 27.61 | 45.66 | |||||||||||||
S.D. | 5.80 | 5.29 | 4.19 | 3.32 | 3.30 | 3.20 | 3.06 | 3.51 | 3.00 | 3.22 | 4.12 | 3.96 | 1.22 | |||||||||||||
SKEW | -0.60 | -0.38 | -0.55 | -0.02 | 0.17 | 0.28 | -0.13 | -0.03 | -0.11 | 0.32 | -0.37 | -0.08 | -0.94 | |||||||||||||
MAX | 36.02 | 39.35 | 46.07 | 49.95 | 59.70 | 66.14 | 75.65 | 74.75 | 63.52 | 57.00 | 43.33 | 36.93 | 47.01 | |||||||||||||
MIN | 7.83 | 17.37 | 24.79 | 36.91 | 46.06 | 52.61 | 59.30 | 61.10 | 50.70 | 41.35 | 25.82 | 19.29 | 43.34 | |||||||||||||
YRS | 48 | 53 | 51 | 47 | 40 | 45 | 44 | 41 | 33 | 41 | 38 | 39 | 7 |