YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.40 | j | 52.23 | a | 50.03 | a | 45.53 | 31.94 | 19.33 | 4.50 | a | 33.93 | f | |||
1968 | -25.33 | v | ----- | z | 17.70 | a | 29.53 | 39.00 | b | 50.03 | 53.65 | 52.03 | a | 45.93 | a | 34.74 | 21.73 | 0.42 | 34.48 | b | ||||||
1969 | -10.13 | a | 2.89 | 3.97 | 32.07 | 40.29 | 44.35 | g | 53.74 | 57.90 | 46.40 | 31.29 | 19.83 | 6.73 | a | 25.91 | a | |||||||||
1970 | -10.45 | -5.11 | 1.65 | 27.40 | 39.10 | a | 54.53 | 56.90 | 51.06 | 44.83 | 31.81 | ----- | z | ----- | z | 29.17 | b | |||||||||
1971 | -16.39 | -1.68 | 13.55 | 29.69 | a | 37.58 | 52.40 | 49.90 | 50.68 | 42.47 | 36.94 | 24.60 | y | -7.21 | q | 29.51 | b | |||||||||
1972 | -12.90 | a | -9.41 | 8.68 | 28.13 | 45.33 | a | 49.77 | 50.90 | 53.20 | a | 39.33 | 28.53 | a | 16.22 | c | -7.74 | 24.17 | ||||||||
1973 | -4.40 | a | -0.54 | 24.52 | 26.03 | 37.91 | h | 48.90 | 49.52 | 53.10 | 38.50 | 34.93 | c | 12.03 | 1.04 | c | 25.78 | a | ||||||||
1974 | -10.27 | a | -4.46 | 7.84 | 28.93 | 37.93 | a | 50.53 | 57.94 | 50.27 | a | 38.70 | 33.53 | a | 21.23 | 9.97 | b | 26.85 | ||||||||
1975 | -1.50 | a | -3.32 | 4.39 | 25.87 | 41.90 | 50.20 | 57.87 | 51.16 | 38.43 | 33.87 | 17.86 | a | -0.87 | 26.32 | |||||||||||
1976 | -10.33 | a | 4.17 | 7.07 | a | 31.40 | 37.87 | 51.62 | a | 52.94 | 54.00 | 41.13 | 25.10 | 10.97 | -9.00 | 24.74 | ||||||||||
1977 | -13.94 | 4.48 | a | 19.70 | a | 32.90 | 50.74 | 51.83 | 55.90 | 45.71 | 45.17 | 31.94 | 13.33 | -5.66 | b | 27.68 | ||||||||||
1978 | -12.10 | -8.15 | a | 9.74 | 29.50 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 10.57 | -6.94 | 3.77 | f | |||||
1979 | -17.23 | a | -12.29 | 10.45 | 24.10 | 36.35 | ----- | z | 56.19 | ----- | z | ----- | z | ----- | z | 18.10 | 11.37 | a | 15.88 | d | ||||||
1980 | ----- | z | ----- | z | ----- | z | ----- | z | 48.39 | m | 46.85 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.85 | k |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | 43.77 | i | 49.33 | 55.73 | a | 54.44 | d | 41.27 | h | 29.26 | d | 22.15 | d | -0.21 | c | 35.12 | f | |
1982 | -20.34 | b | -2.18 | f | 11.90 | a | 29.31 | a | 45.63 | a | 43.53 | 54.65 | 47.63 | a | 37.96 | b | 36.07 | b | 16.88 | d | 9.93 | a | 28.47 | a | ||
1983 | 2.50 | c | 11.31 | b | 21.52 | b | 29.60 | 36.61 | 50.97 | a | 58.77 | a | 53.71 | 43.93 | a | 30.97 | b | 24.61 | b | -10.29 | c | 29.52 | ||||
1984 | -4.12 | g | 15.70 | b | 11.90 | a | 33.69 | a | 38.93 | b | 53.46 | f | 54.66 | b | 57.39 | c | 39.20 | e | 35.42 | e | 17.26 | c | -2.59 | d | 30.16 | b |
1985 | -8.85 | e | -8.60 | c | 21.77 | 32.53 | 45.45 | 46.70 | c | 53.18 | c | 51.10 | b | 41.62 | a | 32.43 | a | 5.55 | a | -13.46 | g | 28.45 | a | |||
1986 | 2.12 | o | -1.88 | d | 16.93 | c | 32.21 | a | 43.50 | a | 51.50 | 56.47 | l | 51.16 | l | 43.18 | b | 31.82 | c | 10.56 | c | 6.80 | f | 28.48 | d | |
1987 | 2.46 | g | 15.89 | a | 22.00 | f | 35.63 | 45.66 | b | 55.38 | a | 60.45 | 54.16 | 46.47 | 30.17 | a | 23.86 | b | 10.82 | c | 37.85 | b | ||||
1988 | -9.85 | e | -9.36 | g | 17.00 | c | 28.43 | b | 44.04 | h | 57.39 | g | 59.16 | f | 56.03 | b | 45.34 | a | 29.86 | b | 16.86 | a | 2.15 | d | 23.23 | d |
1989 | -4.42 | -13.93 | 7.20 | a | 28.00 | 43.20 | a | 49.76 | a | 59.45 | 55.57 | a | 45.45 | a | 30.52 | 12.21 | a | -7.60 | a | 25.45 | ||||||
1990 | 7.74 | 4.18 | 20.40 | a | 29.50 | 39.37 | a | 53.80 | 54.94 | 55.42 | 46.40 | 31.45 | 19.57 | -3.52 | 29.94 | |||||||||||
1991 | -10.00 | 6.96 | 15.23 | 32.37 | 47.26 | 55.79 | a | 56.50 | c | 56.06 | 43.03 | 28.00 | 11.73 | 4.39 | 28.94 | |||||||||||
1992 | 4.35 | 9.03 | 18.00 | 27.80 | 43.55 | 48.60 | 49.50 | a | 49.39 | 40.73 | 28.48 | 19.87 | -3.77 | 27.96 | ||||||||||||
1993 | -7.48 | -5.89 | 10.77 | 27.90 | 40.97 | 48.87 | ----- | z | 54.52 | 38.37 | 26.68 | 13.10 | 5.88 | e | 23.06 | a | ||||||||||
1994 | -18.93 | a | -12.64 | 19.10 | 27.10 | 41.81 | 53.53 | 54.86 | b | 51.17 | b | 46.53 | 38.84 | 22.17 | 10.90 | b | 27.87 | |||||||||
1995 | -2.74 | -7.48 | a | 17.52 | b | 24.97 | 39.90 | 56.87 | 56.00 | c | 55.48 | 43.24 | a | 33.84 | 8.30 | 6.70 | k | 29.63 | a | |||||||
1996 | 14.73 | t | 6.47 | j | ----- | z | 20.39 | b | 40.84 | 53.21 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.15 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -8.53 | -0.90 | 13.54 | 29.07 | 41.62 | 51.02 | 54.85 | 52.85 | 42.72 | 31.86 | 16.38 | 0.87 | 27.22 | |||||||||||||
S.D. | 7.35 | 8.76 | 6.26 | 3.26 | 3.69 | 3.13 | 3.03 | 3.02 | 3.07 | 3.23 | 5.10 | 7.04 | 1.91 | |||||||||||||
SKEW | 0.52 | 0.40 | -0.15 | -0.39 | 0.60 | -0.19 | -0.17 | -0.40 | -0.26 | 0.06 | -0.27 | 0.07 | -0.18 | |||||||||||||
MAX | 7.74 | 15.89 | 24.52 | 35.63 | 50.74 | 56.87 | 60.45 | 57.90 | 46.53 | 38.84 | 24.61 | 11.37 | 29.94 | |||||||||||||
MIN | -20.34 | -13.93 | 1.65 | 20.39 | 36.35 | 43.53 | 49.50 | 45.71 | 37.96 | 25.10 | 5.55 | -10.29 | 24.17 | |||||||||||||
YRS | 22 | 23 | 25 | 27 | 24 | 24 | 24 | 25 | 25 | 26 | 26 | 23 | 11 |