YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.36 | q | 37.67 | 31.17 | a | 14.43 | 11.23 | a | 23.62 | h | ||
1932 | 8.61 | 12.27 | c | 24.87 | a | 31.45 | a | 36.87 | 44.25 | b | 46.03 | 40.65 | 34.10 | 26.31 | b | 24.38 | a | 2.96 | h | 29.98 | a | |||||
1933 | 9.61 | 2.78 | a | 19.97 | a | 26.50 | 31.20 | a | 38.42 | f | 41.58 | 38.00 | 31.63 | k | ----- | z | ----- | z | 23.40 | f | 24.23 | e | ||||
1934 | 25.90 | a | 27.70 | a | 31.60 | a | 30.70 | 36.40 | a | 39.00 | 52.48 | ----- | z | 28.56 | n | 29.19 | 24.47 | 7.29 | 30.47 | b | ||||||
1935 | 9.10 | 7.26 | a | 9.13 | 26.76 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.55 | b | 14.52 | a | 12.03 | 12.93 | f | |||
1936 | 11.03 | 13.78 | b | 21.72 | b | 26.24 | m | ----- | z | ----- | z | ----- | z | ----- | z | 31.44 | n | ----- | z | 13.43 | 17.77 | 15.55 | g | |||
1937 | -4.53 | a | 9.63 | a | 19.40 | a | ----- | z | ----- | z | 37.15 | c | 47.77 | a | 40.94 | m | 40.07 | b | 30.32 | 27.63 | 18.00 | c | 25.05 | c | ||
1938 | 15.54 | r | ----- | z | ----- | z | 25.29 | w | ----- | z | ----- | z | 50.53 | p | 49.50 | o | 51.67 | 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 | 19.10 | a | 32.20 | 37.27 | a | 41.43 | 47.30 | a | 44.84 | 38.20 | 28.97 | 13.60 | 20.17 | b | 32.31 | b | ||||||
1953 | 25.70 | a | 19.11 | a | 22.60 | a | 27.17 | 31.06 | n | 36.11 | b | 45.52 | b | 42.88 | e | 37.68 | e | 26.05 | i | 23.16 | e | 15.25 | c | 29.52 | b | |
1954 | 22.10 | 24.22 | e | 22.36 | f | 28.93 | a | 37.61 | c | 41.04 | b | 48.93 | b | 42.54 | e | 36.14 | b | 26.78 | d | 26.71 | b | 13.47 | a | 31.68 | a | |
1955 | 6.58 | 9.38 | b | 17.23 | a | 27.41 | a | 33.96 | c | 43.73 | 44.96 | d | 50.76 | b | 50.50 | h | 30.47 | p | 21.43 | 20.48 | d | 27.59 | b | |||
1956 | 20.31 | e | 9.88 | c | 21.71 | c | 30.56 | c | 40.41 | b | 40.68 | b | 49.48 | f | 44.88 | e | 36.18 | b | 28.74 | d | 17.73 | d | 15.38 | b | 27.86 | a |
1957 | 4.65 | 17.93 | 26.06 | 27.61 | b | 36.82 | c | 41.62 | f | 43.88 | f | 43.96 | g | 41.04 | e | 33.11 | c | 21.22 | c | 21.28 | b | 25.52 | c | |||
1958 | 14.92 | e | 28.68 | c | 23.97 | b | 30.50 | b | 41.30 | a | 45.38 | d | 48.00 | e | 51.26 | d | 38.11 | c | 31.14 | c | 22.81 | c | 25.68 | c | 33.48 | |
1959 | 24.14 | b | 21.81 | a | 24.19 | 30.54 | b | 32.32 | c | 44.65 | d | 49.70 | a | 48.44 | d | 39.88 | e | 32.32 | c | 19.26 | c | 13.97 | b | 31.77 | ||
1960 | 10.24 | b | 15.37 | b | 25.88 | e | 29.50 | d | 34.92 | g | 43.88 | f | 53.20 | f | 45.19 | d | 38.81 | c | 28.40 | f | 24.21 | a | 16.96 | c | 25.77 | d |
1961 | 18.13 | 25.21 | d | 26.57 | c | 28.00 | e | 34.54 | g | 46.55 | a | 50.48 | b | 53.31 | b | 34.71 | b | 29.85 | d | 19.52 | g | 17.23 | e | 33.01 | b | |
1962 | 8.79 | b | 21.19 | a | 22.37 | a | 31.56 | c | 34.83 | g | 41.32 | b | 44.86 | c | 43.76 | f | 40.36 | h | 31.07 | c | 25.15 | d | 22.33 | d | 27.63 | c |
1963 | 11.22 | d | 28.50 | d | 24.04 | g | 24.06 | l | 40.33 | g | 42.28 | e | 44.77 | a | 48.03 | b | 46.41 | c | 37.54 | c | 27.00 | 18.30 | a | 33.78 | c | |
1964 | 12.30 | a | 10.00 | a | 16.86 | c | 26.87 | 32.70 | a | 43.40 | 47.26 | 43.83 | b | 35.59 | c | 31.61 | 22.97 | a | 20.87 | 28.69 | ||||||
1965 | 18.26 | 23.04 | a | 20.65 | ----- | z | 33.70 | a | 42.67 | 48.00 | a | 46.60 | a | 33.90 | 31.19 | 28.52 | a | 17.43 | a | 31.27 | a | |||||
1966 | 17.80 | a | 15.62 | b | 26.00 | a | 28.57 | 39.17 | b | 41.76 | a | 46.43 | c | 46.34 | b | 42.26 | c | 29.86 | b | 27.93 | a | 20.97 | a | 31.89 | ||
1967 | 21.15 | e | 23.41 | a | 25.80 | a | 27.78 | c | 34.43 | a | 43.10 | a | 51.34 | b | 51.04 | c | 43.08 | d | 29.00 | b | 25.40 | 14.48 | 32.50 | |||
1968 | 15.93 | a | 28.57 | a | 25.10 | a | 23.23 | 34.39 | c | 42.11 | c | 49.83 | b | 46.68 | 38.04 | b | 30.04 | c | 28.17 | f | 17.67 | a | 31.96 | a | ||
1969 | 20.66 | b | 19.96 | 21.93 | b | 28.31 | a | 37.17 | b | 44.86 | a | 49.00 | a | 45.97 | a | 39.72 | a | 26.94 | 19.93 | a | 20.55 | b | 31.25 | |||
1970 | 23.37 | a | 24.39 | 22.77 | 24.90 | a | 34.97 | 45.10 | 48.42 | 46.59 | b | 33.43 | b | 26.65 | 27.20 | 16.42 | 31.18 | |||||||||
1971 | 20.84 | 20.82 | 21.60 | a | 28.10 | 36.16 | 39.83 | 48.55 | 51.00 | e | 33.56 | e | 27.67 | a | 23.61 | b | 12.55 | 30.36 | ||||||||
1972 | 12.16 | 22.00 | 26.73 | a | 27.73 | 35.93 | a | 44.17 | 45.19 | 47.00 | 35.83 | 32.57 | c | 25.54 | b | 10.48 | 30.45 | |||||||||
1973 | 14.00 | b | 22.64 | 23.21 | b | 27.66 | a | 35.32 | 41.63 | 49.70 | a | 46.90 | b | 38.55 | a | 29.48 | 26.70 | 23.06 | 31.57 | |||||||
1974 | 15.35 | 20.82 | 25.77 | a | 28.80 | 30.33 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.00 | a | ----- | z | 23.15 | g | |||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | 35.19 | e | 42.00 | d | 53.32 | 45.43 | h | 40.28 | a | 30.81 | 21.10 | 19.48 | 34.60 | e | ||||
1976 | ----- | z | ----- | z | 16.03 | 28.97 | 37.97 | a | 41.07 | a | 51.96 | f | 45.17 | a | 42.61 | b | 29.94 | 24.48 | i | 15.29 | 32.13 | d | ||||
1977 | 10.50 | a | 22.74 | a | 21.62 | b | 31.41 | a | 33.33 | d | 48.75 | b | 46.48 | d | 49.07 | a | 39.27 | d | 33.15 | e | 25.70 | c | 23.83 | a | 32.16 | |
1978 | 23.90 | a | 22.48 | c | 28.90 | b | 31.17 | a | 33.76 | f | 41.17 | r | 48.72 | f | 41.07 | c | 37.17 | a | 30.14 | b | 18.93 | a | 10.97 | a | 27.19 | c |
1979 | 4.35 | 22.73 | b | 25.87 | a | 28.64 | b | 37.21 | g | 43.29 | f | 48.00 | 46.94 | 40.40 | e | 33.72 | b | 15.60 | 22.04 | d | 28.83 | b | ||||
1980 | 17.04 | e | 26.26 | b | ----- | z | 32.37 | c | 34.71 | c | 37.61 | b | 48.17 | a | 41.60 | a | 37.50 | 33.17 | b | 26.62 | a | 22.00 | a | 32.46 | a | |
1981 | 21.57 | a | 20.57 | 25.80 | a | 33.25 | b | 35.68 | c | 42.37 | 45.90 | b | 49.32 | 38.25 | b | 27.55 | 26.88 | e | 21.76 | j | 33.38 | a | ||||
1982 | 15.85 | d | 18.64 | 25.37 | a | 22.68 | b | 26.78 | v | 44.17 | 50.52 | 46.68 | 38.44 | l | 29.65 | 17.85 | c | 14.07 | a | 28.55 | b | |||||
1983 | 21.46 | e | 24.76 | g | 29.88 | f | 25.64 | e | 36.50 | a | 42.37 | c | 47.86 | b | 52.82 | c | 35.73 | 33.54 | c | 28.37 | 14.25 | c | 33.85 | b | ||
1984 | 10.00 | b | 15.86 | 27.54 | c | 28.00 | a | 38.24 | f | 40.78 | c | 51.88 | e | 53.22 | d | 34.62 | i | 24.27 | i | ----- | z | 11.46 | e | 29.84 | d | |
1985 | 9.11 | d | 12.63 | a | 20.71 | c | 29.54 | q | 38.03 | a | 44.10 | a | 54.36 | c | 43.16 | f | 34.35 | d | 23.78 | d | 12.89 | b | 8.12 | e | 25.81 | b |
1986 | 22.70 | d | 27.16 | c | 31.36 | c | 29.69 | d | 36.13 | a | 45.19 | d | 45.43 | j | 52.85 | e | 37.45 | h | 26.05 | j | ----- | z | ----- | z | 35.01 | e |
1987 | 13.41 | b | 23.93 | a | 28.10 | b | 32.89 | k | 37.27 | e | 44.70 | t | 45.19 | e | ----- | z | ----- | z | 30.72 | b | 22.37 | c | 13.35 | k | 28.71 | e |
1988 | 14.70 | a | 21.56 | b | 22.76 | b | 31.69 | d | 36.20 | a | 45.22 | g | 47.43 | j | 46.67 | a | 40.25 | b | 39.22 | d | 24.30 | g | 14.21 | g | 31.63 | d |
1989 | 12.45 | b | 11.77 | b | 29.93 | c | 34.48 | a | 36.44 | f | 45.54 | d | 54.26 | d | 47.00 | h | 41.70 | j | 33.17 | g | 21.21 | k | 18.58 | l | 31.40 | f |
1990 | 22.32 | 16.43 | 27.00 | b | 36.29 | f | 36.21 | b | 43.90 | i | ----- | z | 52.22 | h | 46.43 | g | 30.91 | i | 23.78 | g | 7.45 | 21.88 | g | |||
1991 | 14.89 | d | 26.08 | c | 25.06 | 29.56 | e | 32.52 | f | 39.57 | b | 53.79 | b | 52.54 | c | 43.04 | g | 32.69 | b | 26.86 | i | 19.79 | c | 32.66 | c | |
1992 | 19.22 | d | 28.19 | b | 29.83 | g | 35.27 | 40.85 | d | 48.15 | d | 49.93 | b | 52.12 | e | ----- | z | 36.43 | c | 20.21 | f | 15.23 | e | 36.15 | c | |
1993 | 11.21 | b | 15.88 | d | 28.89 | d | 31.43 | b | 43.50 | e | 41.45 | a | 42.41 | d | 47.31 | b | 39.57 | i | 34.07 | c | 15.33 | i | 20.63 | a | 31.68 | b |
1994 | 22.83 | b | 19.30 | e | 28.87 | 33.66 | a | 40.12 | f | 45.78 | c | 54.85 | e | 52.00 | f | 43.33 | i | 32.50 | e | 19.59 | c | 16.88 | f | 32.17 | d | |
1995 | 24.19 | e | 27.40 | m | 27.30 | a | 30.88 | d | 39.48 | b | 43.70 | 50.25 | c | 47.38 | e | 44.48 | i | 30.81 | j | 29.81 | i | 21.71 | g | 37.60 | e | |
1996 | 20.80 | f | 20.21 | a | 28.69 | e | 31.41 | c | 38.45 | b | 45.56 | c | 53.97 | b | 51.07 | d | 39.63 | c | 32.65 | e | 27.12 | m | 24.20 | f | 37.96 | c |
1997 | 20.96 | c | 23.19 | b | 27.96 | c | 31.19 | c | 41.00 | a | 44.88 | f | 51.07 | d | 50.65 | e | 46.21 | a | 31.41 | d | 28.83 | g | 16.85 | e | 34.05 | b |
1998 | 28.63 | a | 24.33 | a | 27.36 | c | 31.57 | b | 38.54 | c | 42.24 | a | 55.59 | b | 53.81 | d | 45.50 | f | 30.71 | j | 27.73 | d | 17.53 | p | 36.64 | c |
1999 | 17.75 | s | 21.96 | c | 27.62 | b | 29.00 | 33.54 | e | 43.82 | b | 47.90 | b | 50.37 | a | 40.50 | d | 31.50 | c | 27.41 | h | 16.82 | i | 36.24 | c | |
2000 | 22.27 | a | 28.40 | d | 24.96 | c | 34.50 | b | 39.23 | 45.31 | a | 52.35 | e | 51.77 | a | 40.42 | f | 32.07 | a | 16.72 | e | 16.41 | i | 34.76 | b | |
2001 | ----- | z | 16.16 | c | 27.79 | b | 36.93 | a | 46.86 | i | 48.33 | i | 55.29 | g | 55.89 | c | 44.17 | g | 33.54 | e | 24.65 | g | 18.64 | i | 34.06 | g |
2002 | 16.35 | h | 19.12 | b | 25.25 | c | 30.00 | h | 34.32 | f | 46.65 | d | 54.70 | d | 46.88 | e | 41.70 | c | 28.00 | i | 24.68 | h | 22.06 | m | 39.05 | f |
2003 | 26.52 | f | 20.83 | e | 29.07 | c | 29.29 | f | 40.19 | d | 45.70 | c | 56.03 | 52.27 | i | 42.84 | k | 39.45 | k | ----- | z | ----- | z | 38.36 | g | |
2004 | ----- | z | 17.93 | o | 27.47 | n | 31.32 | e | 37.33 | m | 44.00 | m | 53.12 | f | 50.79 | g | 38.15 | q | ----- | z | ----- | z | ----- | z | 31.32 | 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 | 17.71 | n | 16.57 | b | 21.59 | d | 19.08 | j |
2020 | 20.12 | e | 19.00 | a | 22.08 | f | 25.61 | l | 38.43 | c | 43.50 | f | ----- | z | ----- | z | ----- | z | 28.33 | y | ----- | z | ----- | z | 25.85 | i |
2021 | ----- | z | 18.18 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.12 | 19.84 | 24.47 | 29.78 | 36.79 | 42.98 | 49.24 | 47.91 | 38.56 | 30.87 | 22.22 | 16.85 | 31.39 | |||||||||||||
S.D. | 6.74 | 6.04 | 4.21 | 2.91 | 2.70 | 2.73 | 3.55 | 3.99 | 3.22 | 3.03 | 4.75 | 4.58 | 1.26 | |||||||||||||
SKEW | -0.52 | -0.67 | -1.08 | -0.05 | 0.22 | -0.34 | 0.10 | -0.26 | 0.45 | 0.24 | -0.51 | -0.30 | -0.55 | |||||||||||||
MAX | 28.63 | 28.68 | 31.60 | 36.93 | 43.50 | 48.75 | 56.03 | 55.89 | 46.41 | 39.22 | 28.52 | 25.68 | 33.48 | |||||||||||||
MIN | -4.53 | 2.78 | 9.13 | 22.68 | 31.20 | 36.11 | 41.58 | 38.00 | 33.43 | 23.78 | 12.89 | 7.29 | 28.69 | |||||||||||||
YRS | 51 | 54 | 52 | 48 | 41 | 45 | 46 | 44 | 37 | 45 | 41 | 43 | 11 |