YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | -2.66 | b | 4.67 | a | 33.28 | a | 44.15 | 51.81 | 64.47 | 71.68 | 69.35 | 54.72 | 47.62 | b | 25.57 | 14.74 | 39.95 | |||||||||
1930 | 2.76 | 26.45 | 30.53 | 47.57 | a | 54.08 | 65.75 | 73.52 | 71.89 | 58.47 | a | 44.24 | 31.75 | 21.98 | d | 44.08 | ||||||||||
1931 | 24.21 | 28.13 | a | 28.82 | 45.50 | 53.44 | 70.07 | 72.15 | a | 68.26 | b | 64.93 | 49.47 | 31.80 | 18.85 | 46.30 | ||||||||||
1932 | 9.90 | 15.93 | a | 21.87 | 46.28 | 57.90 | 69.25 | 72.60 | 70.21 | 58.67 | 42.24 | 28.10 | 13.44 | 42.20 | ||||||||||||
1933 | 14.98 | 11.32 | 31.06 | 42.97 | 56.23 | 75.07 | 73.44 | 70.06 | 64.80 | 44.76 | 30.28 | 11.74 | 43.89 | |||||||||||||
1934 | 18.61 | 20.54 | 27.75 | a | 45.70 | 68.03 | a | 68.75 | 75.32 | a | 69.47 | 55.40 | 51.45 | 35.07 | 13.38 | e | 45.79 | |||||||||
1935 | 5.95 | 27.32 | 31.16 | 40.05 | 51.32 | 63.19 | a | 77.06 | 69.84 | 60.28 | 45.13 | 19.93 | c | 13.08 | 42.03 | |||||||||||
1936 | -5.52 | -9.50 | 29.53 | 38.14 | a | 62.38 | a | 69.72 | 82.13 | 74.33 | e | 64.03 | 44.13 | 27.27 | 16.83 | a | 41.12 | |||||||||
1937 | -7.00 | 6.38 | 24.15 | 39.64 | e | 58.41 | d | 64.36 | b | 73.39 | 75.58 | a | 58.68 | b | 44.25 | e | 24.96 | b | 10.78 | a | 39.46 | |||||
1938 | 9.02 | ----- | z | ----- | z | 44.46 | c | 53.68 | c | 65.61 | b | 70.72 | a | 73.68 | 60.92 | 51.79 | b | 26.27 | 20.35 | 47.65 | b | |||||
1939 | 15.08 | 1.57 | 27.55 | 41.52 | b | 61.28 | a | 63.83 | 72.00 | 68.95 | c | 58.90 | 43.48 | c | 34.42 | 27.31 | 42.99 | |||||||||
1940 | 3.85 | 16.74 | 25.16 | 39.33 | 53.98 | c | 63.97 | a | 72.92 | a | 67.05 | 63.78 | a | 53.02 | a | 25.05 | 21.52 | 42.20 | ||||||||
1941 | 12.03 | 11.48 | 25.41 | b | 45.83 | 59.39 | 65.20 | 72.29 | 70.18 | a | 57.13 | 45.60 | a | 31.77 | 23.77 | 43.34 | ||||||||||
1942 | 19.63 | 16.61 | 32.24 | 44.92 | 49.60 | 60.88 | 67.26 | 66.87 | 52.87 | 45.39 | 30.88 | 12.00 | 41.60 | |||||||||||||
1943 | -0.39 | 14.43 | 18.35 | 44.33 | ----- | z | 62.83 | 70.95 | 67.53 | 54.65 | 47.84 | 27.37 | 19.63 | a | 38.87 | a | ||||||||||
1944 | 20.85 | e | 10.09 | b | 20.30 | f | 38.90 | 59.33 | a | 64.12 | b | 67.60 | b | 66.19 | b | 56.55 | 48.81 | 32.57 | 19.03 | 44.00 | a | |||||
1945 | 14.19 | 14.02 | a | 35.85 | 39.59 | b | 48.73 | 58.98 | a | 68.39 | 67.66 | 55.12 | b | 46.68 | c | 26.70 | e | 6.71 | e | 40.22 | ||||||
1946 | 10.06 | d | 8.86 | c | 37.50 | c | 49.88 | a | 53.17 | b | 66.29 | a | 72.16 | 68.08 | a | 57.93 | a | 43.38 | a | 29.64 | e | 16.79 | e | 42.81 | ||
1947 | 19.80 | d | 10.78 | c | 24.97 | b | 40.68 | b | 51.20 | a | 63.65 | c | 72.13 | 75.43 | a | 59.02 | 54.77 | a | 24.41 | c | 13.94 | d | 42.56 | |||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.67 | a | 71.42 | 65.55 | 47.03 | 31.32 | 14.33 | a | 50.55 | f | ||||
1949 | 4.95 | 3.05 | 24.42 | 46.25 | 57.97 | b | 66.83 | 72.71 | 74.40 | 56.45 | 45.65 | a | 36.68 | 11.26 | 41.72 | |||||||||||
1950 | -6.34 | 8.20 | 21.74 | 34.07 | 51.15 | 65.67 | 67.98 | 66.27 | 59.90 | 47.82 | 23.47 | 9.63 | 37.46 | |||||||||||||
1951 | 3.44 | 12.89 | 15.00 | 39.53 | 57.42 | 58.63 | 67.85 | 65.58 | 53.00 | 43.32 | a | 22.05 | 7.30 | a | 37.17 | |||||||||||
1952 | 2.03 | a | 16.88 | 18.95 | 46.00 | 55.76 | 66.63 | 69.89 | 68.42 | 61.75 | 41.37 | 30.58 | 16.63 | 41.24 | ||||||||||||
1953 | 10.37 | 16.54 | 27.10 | 37.67 | 52.81 | 64.90 | a | 69.06 | 70.32 | 58.52 | 52.44 | 34.45 | 16.37 | 42.54 | ||||||||||||
1954 | -0.84 | 29.95 | 24.06 | 41.17 | 50.44 | 64.60 | 71.73 | 68.19 | 57.85 | 43.95 | 34.78 | 19.56 | 42.12 | |||||||||||||
1955 | 11.21 | 6.48 | 20.24 | 50.17 | 61.00 | 64.07 | 73.71 | 71.74 | 58.53 | 47.23 | 18.48 | 4.79 | 40.64 | |||||||||||||
1956 | 7.87 | 5.29 | 20.60 | 35.60 | a | 54.52 | 70.10 | 67.32 | 68.19 | 55.98 | 49.79 | 28.72 | 19.65 | 40.30 | ||||||||||||
1957 | 2.47 | 13.00 | 27.70 | a | 41.93 | 53.98 | 61.97 | 74.35 | 67.74 | 55.15 | 45.85 | 29.05 | a | 22.18 | 41.28 | |||||||||||
1958 | 16.16 | 11.45 | 29.21 | 43.33 | 57.35 | 58.98 | a | 66.23 | 69.90 | 59.25 | 47.48 | a | 30.48 | 12.11 | 41.83 | |||||||||||
1959 | 4.95 | 6.04 | 32.06 | 42.33 | 54.85 | 68.28 | 70.92 | 71.87 | 58.52 | 39.27 | 21.78 | a | 26.63 | 41.46 | ||||||||||||
1960 | 10.89 | 12.07 | 16.84 | 43.10 | 56.21 | 63.33 | 72.40 | 70.73 | 60.70 | 48.23 | 30.92 | 10.92 | 41.36 | |||||||||||||
1961 | 8.47 | 15.80 | 33.47 | 37.22 | 50.73 | 67.28 | 67.98 | 71.73 | 55.25 | 46.81 | 29.35 | 8.31 | 41.03 | |||||||||||||
1962 | 6.18 | 9.70 | 20.94 | 41.12 | 55.92 | 63.78 | 67.06 | 69.45 | 55.26 | a | 49.45 | 33.93 | a | 18.35 | 40.93 | |||||||||||
1963 | 2.32 | 11.75 | 31.18 | 43.97 | 53.95 | 68.00 | 71.35 | 68.85 | 61.12 | 56.16 | 34.08 | 7.34 | 42.51 | |||||||||||||
1964 | 14.37 | a | 19.88 | 19.97 | 44.02 | 57.26 | 65.26 | a | 72.79 | 66.05 | 55.37 | 45.85 | 27.52 | 4.45 | 41.06 | |||||||||||
1965 | 1.00 | a | 6.80 | 16.42 | 41.10 | 54.93 | a | 63.93 | 69.94 | 67.97 | 48.03 | 48.74 | 27.75 | 22.05 | 39.06 | |||||||||||
1966 | -3.45 | 7.70 | 30.97 | 37.83 | 52.16 | 64.80 | 74.40 | 65.83 | a | 58.87 | 44.92 | 23.22 | 14.77 | 39.34 | ||||||||||||
1967 | 10.00 | 6.02 | 28.74 | 38.68 | 50.37 | 62.02 | 67.92 | 66.52 | 58.93 | 43.81 | 28.97 | 15.98 | 39.83 | |||||||||||||
1968 | 6.77 | 10.60 | 33.34 | 41.53 | 50.76 | 63.52 | 68.52 | 66.48 | 57.67 | 46.12 | a | 30.83 | 10.47 | 40.55 | ||||||||||||
1969 | -0.35 | 13.64 | 15.31 | 44.65 | 56.15 | 57.72 | 68.81 | 72.15 | 61.17 | 41.16 | 30.92 | 18.15 | 39.95 | |||||||||||||
1970 | 0.33 | a | 12.48 | 19.78 | a | 39.67 | 53.55 | 68.15 | 72.98 | 70.40 | 59.47 | 45.73 | 26.50 | 10.77 | 39.98 | |||||||||||
1971 | 2.68 | 11.66 | 27.48 | 45.03 | 52.35 | 66.83 | 66.18 | 69.87 | 57.91 | a | 47.13 | 28.27 | 10.27 | 40.47 | ||||||||||||
1972 | 1.77 | 5.43 | a | 24.24 | 40.15 | 57.97 | 65.02 | 67.95 | 69.58 | 56.73 | 41.47 | 27.48 | 5.88 | a | 38.64 | |||||||||||
1973 | 12.85 | 18.00 | 36.27 | 42.53 | 55.10 | 66.17 | 70.26 | 73.08 | 56.17 | 50.92 | a | 26.05 | 11.66 | 43.25 | ||||||||||||
1974 | 3.66 | 12.07 | 24.87 | 42.03 | 51.76 | 63.87 | 74.98 | 65.90 | a | 56.38 | b | 47.05 | 30.45 | 20.41 | i | 43.00 | a | |||||||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | 57.07 | b | 68.97 | 72.38 | b | 73.85 | a | 58.29 | d | 40.29 | 24.45 | 10.82 | 50.76 | d | ||||
1977 | -1.58 | 19.96 | 32.02 | b | 50.93 | a | 66.08 | a | 68.09 | a | 73.58 | 64.92 | a | 57.27 | 45.06 | f | 26.15 | 8.23 | a | 42.33 | a | |||||
1978 | -3.81 | e | 7.23 | b | 22.90 | g | 41.92 | 59.30 | a | 65.85 | c | 70.74 | 70.68 | 65.14 | a | 46.37 | 22.78 | 10.37 | a | 41.51 | a | |||||
1979 | -2.97 | -0.14 | 21.70 | a | 36.85 | 50.31 | 65.26 | a | 71.22 | f | 67.35 | 62.22 | 44.32 | 27.25 | 23.00 | 35.92 | a | |||||||||
1980 | 9.95 | a | 12.66 | 23.65 | a | 48.85 | 61.40 | 66.62 | 71.74 | h | 68.07 | a | 58.55 | a | 45.13 | 35.42 | 17.03 | 40.67 | a | |||||||
1981 | 15.90 | a | 20.93 | 34.47 | a | 48.45 | 55.94 | 64.47 | a | 72.92 | 70.87 | 59.92 | 45.06 | 36.25 | 11.53 | 44.73 | ||||||||||
1982 | -7.34 | f | 10.94 | c | 24.98 | d | 39.48 | b | 57.26 | 61.48 | a | 73.52 | c | 70.33 | a | 58.60 | e | 44.82 | f | 25.44 | c | 22.26 | d | 44.43 | b | |
1983 | 18.94 | e | 24.39 | f | 29.84 | b | 40.89 | b | 52.48 | c | 65.50 | a | 75.28 | b | 76.60 | a | 58.85 | c | 43.60 | g | 29.94 | f | ----- | z | 52.30 | d |
1984 | 9.14 | j | 25.69 | e | 22.40 | g | 44.14 | a | 53.78 | d | 64.59 | a | 71.73 | a | 72.54 | c | 54.00 | d | 47.06 | e | 28.83 | d | 9.90 | f | 51.37 | c |
1985 | 2.64 | m | 7.39 | e | 37.27 | e | 48.22 | 61.32 | 60.98 | c | 71.07 | b | 64.65 | d | 56.60 | e | 43.89 | h | 11.77 | f | 5.26 | j | 50.94 | d | ||
1986 | 14.54 | g | 10.70 | e | 32.92 | a | 42.97 | 58.53 | b | 67.66 | b | 71.12 | b | 65.33 | b | 56.19 | i | 45.00 | j | 21.57 | h | 20.46 | d | 46.21 | d | |
1987 | 19.74 | h | 27.58 | c | 30.46 | d | 50.65 | 62.88 | e | 70.21 | a | 73.55 | a | 66.83 | b | 57.98 | g | 43.83 | e | 34.89 | g | 23.44 | g | 53.25 | d | |
1988 | 9.00 | i | 9.64 | k | 30.06 | f | 43.02 | d | 62.15 | d | 75.15 | c | 73.74 | h | 71.24 | h | 56.17 | d | 42.00 | 26.64 | b | 17.94 | d | 46.15 | e | |
1989 | 11.03 | a | 2.41 | a | 18.80 | a | 42.10 | 57.07 | a | 64.40 | 75.63 | 69.58 | a | 58.72 | 46.90 | 24.64 | a | 5.89 | 39.76 | |||||||
1990 | 21.81 | 18.19 | a | 32.85 | 43.57 | a | 54.61 | 65.38 | 69.13 | 69.08 | 63.08 | 43.02 | 32.92 | 9.27 | a | 43.58 | ||||||||||
1991 | 7.91 | c | 22.68 | 29.76 | 46.25 | 59.40 | 69.00 | a | 69.19 | 71.65 | 58.05 | 42.13 | 21.65 | 19.06 | 43.06 | |||||||||||
1992 | 17.45 | a | 24.32 | a | 32.93 | a | 39.93 | a | 58.00 | a | 62.53 | a | 63.34 | b | 63.87 | a | 55.48 | a | 45.10 | 26.15 | 10.47 | 41.63 | ||||
1993 | 3.45 | a | 8.48 | b | 24.97 | 40.66 | b | 54.56 | 60.40 | a | 64.43 | a | 67.53 | a | 52.32 | 43.28 | a | 24.34 | b | 15.34 | c | 38.31 | ||||
1994 | -5.38 | b | 1.93 | a | 27.63 | 42.97 | a | 59.98 | b | 67.02 | 67.21 | b | 66.48 | b | 60.93 | b | 48.18 | a | 31.07 | c | 15.19 | 40.27 | ||||
1995 | 10.08 | a | 14.50 | a | 24.44 | 37.78 | a | 53.00 | 68.78 | 70.11 | 71.82 | a | 58.02 | b | 43.47 | b | 23.84 | b | 13.58 | a | 40.78 | |||||
1996 | -0.48 | a | 11.83 | e | 18.34 | 38.29 | a | 52.88 | a | 66.41 | a | 67.35 | a | 68.94 | 59.03 | 44.40 | 15.43 | 5.26 | d | 37.31 | ||||||
1997 | 0.54 | c | 12.26 | a | 21.64 | b | 37.20 | 52.34 | 68.58 | 71.82 | 67.71 | b | 61.47 | a | 47.61 | c | 22.59 | b | 23.45 | 40.60 | ||||||
1998 | 9.58 | a | 27.09 | a | 23.10 | a | 47.77 | 60.40 | 62.43 | b | 72.03 | 70.90 | a | 64.00 | a | 47.07 | b | 30.76 | a | 21.38 | a | 44.71 | ||||
1999 | 6.07 | c | 23.56 | b | 33.13 | a | 44.35 | 56.85 | a | 65.25 | 71.08 | 69.23 | a | 56.72 | a | 43.71 | 37.22 | ----- | z | 46.11 | a | |||||
2000 | 12.46 | f | 24.77 | c | 35.33 | e | 42.75 | b | 57.35 | 63.86 | e | 70.56 | d | 70.15 | d | 56.34 | b | 47.22 | b | 23.46 | c | 4.12 | c | 45.08 | a | |
2001 | 15.46 | d | 3.50 | b | 23.31 | b | 42.24 | a | 57.26 | d | 64.82 | b | 73.40 | a | 70.35 | 58.41 | a | 43.24 | 42.69 | q | ----- | z | 45.20 | b | ||
2002 | ----- | z | ----- | z | ----- | z | 40.63 | 50.85 | 69.21 | a | 73.29 | j | 68.00 | d | 60.70 | c | 35.14 | b | 32.64 | w | ----- | z | 54.09 | f | ||
2003 | ----- | z | ----- | z | ----- | z | ----- | z | 54.45 | 64.45 | a | 69.67 | e | 68.62 | w | 56.40 | a | 48.72 | b | 27.18 | k | ----- | z | 58.74 | g | |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.71 | i | 66.95 | c | 62.67 | j | 61.84 | b | 42.73 | t | ----- | z | ----- | z | 64.39 | j |
2005 | ----- | z | ----- | z | ----- | z | 47.31 | a | 53.45 | 66.20 | c | 71.94 | d | 67.38 | a | 61.65 | 45.39 | ----- | z | ----- | z | 59.05 | e | |||
2006 | ----- | z | ----- | z | ----- | z | 47.92 | 55.87 | a | 64.08 | j | 74.98 | c | 69.50 | 56.20 | 41.60 | a | 29.90 | a | 22.10 | 49.76 | d | ||||
2007 | 9.52 | a | 4.81 | a | 43.59 | t | 39.90 | 59.44 | 68.25 | 72.66 | 66.18 | c | 58.09 | a | 48.56 | 29.67 | c | ----- | z | 45.71 | b | |||||
2008 | ----- | z | ----- | z | ----- | z | ----- | z | 52.10 | b | 62.37 | 72.00 | d | 69.50 | a | 57.15 | 44.63 | a | 36.47 | n | ----- | z | 59.63 | f | ||
2009 | ----- | z | ----- | z | ----- | z | 41.00 | g | 55.14 | j | 60.69 | f | 66.87 | l | 66.08 | k | 60.35 | t | 40.81 | e | 35.83 | g | 9.20 | c | 25.00 | j |
2010 | 8.50 | j | 7.93 | g | 31.80 | a | 49.64 | e | 55.88 | c | 64.00 | g | 70.90 | b | 71.44 | g | 54.57 | b | 48.81 | 28.72 | 9.62 | j | 48.62 | e | ||
2011 | 5.26 | d | 8.43 | h | 18.94 | m | 41.02 | h | 52.55 | c | 64.30 | g | 74.12 | e | 70.73 | g | 58.54 | f | 49.65 | a | 30.70 | c | 22.80 | c | 39.18 | f |
2012 | 18.75 | e | 20.82 | g | 40.07 | b | 45.66 | h | 58.10 | b | 67.56 | d | 75.26 | 66.92 | k | 57.17 | c | 42.90 | f | 32.59 | s | 9.75 | q | 52.82 | f | |
2013 | 11.02 | c | 10.22 | e | 16.85 | d | 29.11 | c | 56.17 | d | 65.00 | g | 69.98 | d | 67.04 | h | 62.90 | 45.38 | g | 24.44 | m | 7.93 | b | 33.02 | d | |
2014 | 5.87 | d | 5.94 | d | 24.23 | c | 37.52 | g | 54.42 | e | 64.77 | d | 67.25 | c | 68.36 | c | 59.50 | d | 48.20 | c | 21.09 | g | 19.12 | b | 41.77 | b |
2015 | 15.33 | g | 6.56 | d | 32.00 | e | 44.57 | g | 53.69 | d | 66.50 | d | 71.54 | c | 65.73 | c | 63.05 | a | 49.04 | c | 34.84 | e | 21.19 | d | 46.41 | b |
2016 | 13.92 | f | 23.25 | k | 37.45 | c | 42.67 | c | 59.31 | d | 65.09 | g | 69.21 | n | 69.44 | 61.21 | a | 45.33 | d | 39.25 | 12.62 | c | 45.91 | d | ||
2017 | 14.33 | d | 22.65 | a | 27.40 | a | 42.85 | 54.03 | a | 67.29 | b | 71.87 | 65.55 | 60.09 | b | 47.18 | i | 26.91 | b | 16.79 | c | 42.71 | a | |||
2018 | 11.77 | e | 5.10 | d | 25.11 | d | 31.45 | b | 62.05 | a | 70.56 | c | 71.62 | j | 68.03 | b | 59.20 | b | 39.77 | g | 20.06 | l | 21.50 | u | 41.66 | d |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | 52.58 | e | 65.90 | a | 72.46 | d | 66.86 | c | ----- | z | ----- | z | ----- | z | ----- | z | 64.45 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.57 | 12.78 | 27.05 | 42.45 | 55.79 | 65.52 | 71.20 | 69.18 | 58.52 | 46.00 | 28.50 | 14.82 | 41.37 | |||||||||||||
S.D. | 7.61 | 7.87 | 6.04 | 4.21 | 3.82 | 3.18 | 3.00 | 2.68 | 3.17 | 3.48 | 4.61 | 5.80 | 2.00 | |||||||||||||
SKEW | 0.08 | 0.22 | -0.06 | -0.32 | 0.63 | 0.24 | 0.16 | 0.52 | -0.07 | 0.15 | -0.13 | 0.05 | 0.16 | |||||||||||||
MAX | 24.21 | 29.95 | 40.07 | 50.93 | 68.03 | 75.15 | 82.13 | 76.60 | 65.55 | 56.16 | 39.25 | 27.31 | 46.30 | |||||||||||||
MIN | -7.00 | -9.50 | 15.00 | 29.11 | 48.73 | 57.72 | 63.34 | 63.87 | 48.03 | 35.14 | 15.43 | 4.13 | 37.17 | |||||||||||||
YRS | 70 | 73 | 73 | 79 | 86 | 82 | 83 | 82 | 85 | 79 | 74 | 73 | 52 |