YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | 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 | ----- | 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 | 46.58 | 44.39 | 37.37 | 28.16 | 29.47 | 24.26 | 35.04 | f | ||||||
1943 | 23.52 | 25.82 | 29.87 | 34.07 | 39.61 | 37.60 | 50.77 | 54.03 | 46.03 | 35.71 | 25.90 | 21.77 | 35.39 | |||||||||||||
1944 | 18.53 | a | 20.31 | 20.81 | 26.90 | 36.13 | 41.27 | 49.97 | 51.58 | 47.43 | 38.79 | b | 26.27 | ----- | z | 34.36 | a | |||||||||
1945 | 21.03 | b | 23.96 | 22.55 | 30.20 | 36.42 | 41.73 | 53.68 | 53.87 | 45.97 | 41.50 | a | 25.83 | 18.47 | a | 34.60 | ||||||||||
1946 | 16.29 | 19.50 | b | 28.07 | a | 35.67 | 36.97 | 37.34 | a | 52.81 | 53.71 | 45.93 | 32.84 | 24.00 | 23.73 | p | 34.83 | a | ||||||||
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.50 | g | 51.32 | f | 48.90 | 38.29 | 21.97 | 19.77 | a | 32.23 | h | |||
1948 | 22.00 | a | 21.93 | a | 22.90 | 33.17 | 38.23 | 45.60 | 58.87 | 62.90 | 62.52 | e | 38.26 | 23.70 | 21.81 | 37.66 | ||||||||||
1949 | 13.43 | c | ----- | z | ----- | z | ----- | z | 38.47 | l | 45.40 | 53.03 | 47.94 | 46.93 | 33.16 | 31.17 | 18.42 | 36.18 | d | |||||||
1950 | 18.74 | 24.82 | 23.71 | ----- | z | 36.33 | g | 41.63 | 51.32 | 42.97 | a | 42.90 | 39.33 | a | 29.33 | 25.77 | a | 34.05 | b | |||||||
1951 | 19.52 | 23.74 | a | 24.48 | 31.20 | 37.58 | 40.13 | 52.87 | 49.06 | 42.41 | h | 35.23 | 25.13 | 19.94 | 32.63 | a | ||||||||||
1952 | 20.10 | 21.03 | 20.90 | a | 31.13 | 37.45 | 42.47 | 48.71 | 51.32 | 46.10 | 36.39 | 22.13 | 17.68 | 32.95 | ||||||||||||
1953 | 22.84 | 16.89 | 24.19 | 28.28 | a | 31.87 | 42.00 | 53.19 | 47.14 | b | 41.03 | 31.61 | 26.23 | 15.84 | 31.76 | |||||||||||
1954 | 18.10 | 21.89 | 21.97 | 30.87 | 37.10 | 42.60 | 51.58 | 47.97 | 43.60 | 32.80 | f | 24.00 | 16.97 | 32.42 | a | |||||||||||
1955 | 13.00 | 13.18 | 20.45 | 24.03 | 33.23 | 40.07 | 46.03 | 49.10 | 48.60 | 40.16 | 27.73 | 23.61 | 31.60 | |||||||||||||
1956 | 25.55 | 15.14 | 23.61 | 28.31 | a | 39.71 | g | 47.27 | 51.93 | b | 50.08 | f | 48.13 | 35.63 | a | 22.20 | 17.77 | 31.55 | b | |||||||
1957 | 22.68 | 27.14 | 26.97 | 29.62 | a | 33.94 | 46.37 | 52.71 | 51.42 | 43.37 | 36.97 | 25.03 | 23.84 | 35.00 | ||||||||||||
1958 | 19.10 | 25.96 | 21.94 | 28.27 | 40.97 | 47.17 | 52.55 | 53.81 | 46.83 | 37.19 | 26.30 | 22.77 | 35.24 | |||||||||||||
1959 | 20.61 | 17.96 | 24.77 | 32.60 | 36.71 | 47.87 | 54.55 | 51.68 | 43.57 | 35.42 | 27.17 | 23.81 | 34.73 | |||||||||||||
1960 | 15.71 | 19.21 | 28.71 | 31.97 | 36.94 | 49.43 | 52.26 | 52.13 | 47.93 | 36.13 | 26.37 | 18.35 | 34.59 | |||||||||||||
1961 | 21.65 | 23.43 | 25.03 | 31.50 | 37.10 | 48.80 | 53.94 | 53.42 | 44.27 | 34.39 | 26.17 | 21.61 | 35.11 | |||||||||||||
1962 | 19.73 | a | 24.25 | 20.58 | 34.67 | 36.32 | 43.60 | 51.35 | 52.61 | 48.23 | 36.65 | 30.70 | 24.48 | 35.27 | ||||||||||||
1963 | 18.61 | 26.79 | 24.52 | 28.63 | 39.32 | 42.77 | 54.77 | 53.58 | 47.93 | 40.10 | 29.40 | 21.29 | 35.64 | |||||||||||||
1964 | 16.68 | 15.83 | 20.97 | 29.07 | 35.52 | 44.73 | 54.84 | 52.20 | a | 46.07 | 39.74 | 26.37 | 23.13 | 33.76 | ||||||||||||
1965 | 24.10 | 20.07 | 25.97 | 30.33 | 36.45 | 40.73 | 54.45 | 51.23 | 44.23 | 38.32 | 33.07 | 26.87 | h | 36.27 | a | |||||||||||
1966 | 20.19 | 19.36 | 27.61 | 32.77 | 41.29 | 46.80 | 54.68 | 53.61 | 49.27 | 37.36 | c | 30.47 | 22.32 | 36.31 | ||||||||||||
1967 | 22.06 | 24.11 | 29.45 | 29.10 | a | 36.68 | 44.07 | 54.45 | 52.61 | 49.03 | 37.42 | 31.10 | 21.29 | q | 37.28 | a | ||||||||||
1968 | 22.13 | 29.68 | d | 28.35 | 29.73 | 39.19 | 46.47 | 52.71 | 49.77 | 44.90 | 37.83 | a | 29.31 | a | 18.74 | 35.74 | ||||||||||
1969 | 28.74 | 23.75 | 22.48 | 30.77 | 39.61 | 44.83 | 55.03 | 55.52 | 48.33 | 34.10 | 30.20 | 25.48 | 36.57 | |||||||||||||
1970 | 22.03 | 26.39 | 25.68 | 26.70 | 34.78 | v | ----- | z | 54.90 | a | 55.00 | 44.53 | 34.33 | a | 29.28 | a | 21.35 | 34.02 | b | |||||||
1971 | 20.97 | 22.89 | a | 25.23 | a | 28.63 | 33.39 | 44.00 | 54.48 | 53.13 | 46.50 | 33.47 | a | 25.97 | 17.59 | i | 35.33 | a | ||||||||
1972 | 20.14 | b | 23.85 | b | 30.67 | d | 31.43 | 36.97 | a | 47.21 | b | 54.03 | b | 51.74 | 44.33 | c | 39.16 | ----- | z | 20.50 | y | 37.95 | b | |||
1973 | 19.00 | 25.78 | a | 26.07 | a | 27.53 | 39.23 | a | 47.50 | 51.36 | c | 51.54 | c | 44.48 | a | 36.03 | a | 27.27 | d | 22.67 | a | 34.87 | ||||
1974 | 20.58 | 20.54 | b | 27.29 | c | 29.20 | e | 39.15 | d | 49.62 | a | ----- | z | 48.50 | o | 46.50 | 38.77 | 28.13 | 19.74 | 31.95 | b | |||||
1975 | 21.71 | 21.79 | 24.61 | 27.03 | 35.10 | ----- | z | ----- | z | 47.12 | n | 46.77 | 35.61 | 26.47 | 23.73 | e | 29.20 | c | ||||||||
1976 | 23.65 | 28.14 | 25.45 | 29.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.78 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 20.39 | 22.35 | 24.87 | 30.11 | 37.09 | 44.24 | 52.72 | 51.70 | 46.32 | 36.49 | 27.09 | 21.26 | 34.82 | |||||||||||||
S.D. | 3.22 | 3.92 | 2.89 | 2.54 | 2.28 | 3.32 | 2.55 | 3.62 | 3.85 | 2.79 | 2.80 | 2.73 | 1.54 | |||||||||||||
SKEW | -0.10 | -0.41 | 0.21 | 0.08 | -0.29 | -0.28 | -0.67 | 0.19 | 1.86 | -0.73 | 0.04 | -0.22 | -0.61 | |||||||||||||
MAX | 28.74 | 29.68 | 30.67 | 35.67 | 41.29 | 49.62 | 58.87 | 62.90 | 62.52 | 41.50 | 33.07 | 25.77 | 37.66 | |||||||||||||
MIN | 13.00 | 13.18 | 20.45 | 24.03 | 31.87 | 37.34 | 46.03 | 42.97 | 37.37 | 28.16 | 21.97 | 15.84 | 31.60 | |||||||||||||
YRS | 33 | 32 | 32 | 31 | 28 | 30 | 31 | 30 | 33 | 33 | 33 | 28 | 18 |