YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1903 | 34.35 | 32.21 | 35.81 | 42.27 | 48.32 | 55.87 | 58.48 | 63.13 | 53.17 | 44.87 | 39.10 | 33.97 | 45.13 | |||||||||||||
1904 | 38.13 | a | 48.93 | 51.87 | 52.43 | 56.94 | 60.10 | 62.65 | 63.65 | 53.20 | 44.26 | 44.80 | 41.61 | 51.55 | ||||||||||||
1905 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1906 | 32.32 | 44.07 | 48.87 | 42.20 | 49.16 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.27 | 31.58 | 40.64 | e | |||||||
1907 | 38.90 | ----- | z | ----- | z | ----- | z | ----- | z | 59.64 | p | 64.58 | 60.61 | 53.40 | 48.16 | 34.97 | 31.00 | 47.37 | e | |||||||
1908 | 30.58 | 33.18 | a | 37.61 | 44.00 | 46.94 | 54.47 | 65.94 | 63.48 | 54.93 | 40.45 | 36.70 | 27.30 | a | 44.63 | |||||||||||
1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1910 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1912 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1913 | 28.31 | e | 34.82 | 38.90 | 44.17 | 45.90 | 56.67 | 70.06 | 67.74 | 63.27 | 58.97 | 54.30 | 40.06 | 50.26 | ||||||||||||
1914 | 36.00 | 36.86 | 42.23 | 48.63 | 55.39 | 61.83 | 68.87 | 67.84 | 60.23 | 50.03 | 38.73 | 28.68 | 49.61 | |||||||||||||
1915 | 30.39 | 34.36 | 40.27 | a | 50.03 | 52.16 | 63.87 | 69.48 | 65.74 | 58.33 | 46.03 | 35.40 | 30.03 | 48.01 | ||||||||||||
1916 | 32.13 | 35.52 | 45.10 | 51.03 | 49.19 | 59.57 | 64.16 | 61.68 | 55.50 | 41.39 | 33.00 | 28.35 | 46.38 | |||||||||||||
1917 | 30.29 | 33.16 | c | 33.29 | 43.33 | 47.23 | 60.43 | ----- | z | 64.42 | 56.43 | 49.45 | 35.30 | 32.06 | 44.13 | a | ||||||||||
1918 | 30.03 | 33.14 | 41.06 | 43.03 | 48.42 | 66.17 | 64.61 | 62.81 | 58.00 | 50.55 | 34.00 | 27.68 | f | 48.35 | a | |||||||||||
1919 | 26.68 | 34.46 | 36.55 | 45.23 | 57.83 | a | 60.00 | 67.61 | 64.94 | 55.93 | a | 39.55 | 33.20 | 26.74 | 45.73 | |||||||||||
1920 | 31.94 | 37.69 | 37.00 | 44.83 | 52.03 | 58.87 | 66.55 | 64.52 | 55.43 | 43.26 | 37.00 | 28.87 | 46.50 | |||||||||||||
1921 | 31.00 | 35.32 | 41.58 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.97 | i | |||
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 | 50.44 | c | 55.84 | 61.70 | 68.29 | 67.97 | 59.63 | 44.94 | 38.20 | 33.68 | 53.41 | c | ||||||||
1940 | 36.68 | 36.69 | 41.52 | 47.40 | 55.94 | 64.53 | 65.90 | 65.71 | 56.93 | 48.55 | 35.57 | 35.87 | 49.27 | |||||||||||||
1941 | 36.52 | 40.00 | 40.81 | 43.73 | 55.00 | 58.30 | 66.52 | 63.39 | 52.93 | 45.84 | 37.57 | 33.87 | 47.87 | |||||||||||||
1942 | 32.39 | 32.14 | 37.45 | 45.70 | 50.26 | 61.20 | 69.29 | 66.00 | 53.97 | 47.74 | 39.30 | 33.23 | 47.39 | |||||||||||||
1943 | 31.97 | 36.43 | 44.39 | 48.20 | 55.39 | 56.60 | 64.71 | 64.19 | 58.93 | 50.19 | 35.00 | 33.58 | 48.30 | |||||||||||||
1944 | 30.81 | 33.45 | 38.10 | 41.60 | 50.32 | 53.80 | 61.58 | 61.32 | 57.13 | 46.65 | 37.20 | 29.31 | b | 45.11 | ||||||||||||
1945 | 28.35 | 36.04 | 37.35 | 44.79 | a | 52.67 | a | 59.10 | 68.55 | 68.42 | 66.87 | 57.06 | 36.90 | 31.90 | 49.00 | |||||||||||
1946 | 31.45 | 30.96 | 37.58 | 47.83 | 53.48 | 61.17 | a | 68.03 | 66.10 | 56.07 | 44.10 | 37.31 | a | 33.00 | 47.26 | |||||||||||
1947 | 27.45 | 35.36 | 42.42 | 49.33 | 56.68 | 61.00 | 64.35 | 62.03 | 60.80 | 48.68 | 32.50 | 30.42 | 47.59 | |||||||||||||
1948 | 29.52 | 34.35 | i | 37.50 | y | 46.30 | 50.58 | 58.77 | 60.52 | 57.84 | 53.20 | 43.97 | 29.07 | 23.03 | b | 45.28 | b | |||||||||
1949 | 17.67 | a | 25.00 | 31.00 | 41.87 | 53.06 | 63.03 | a | 65.42 | 60.83 | a | 56.90 | 44.58 | 39.23 | 28.81 | d | 43.95 | |||||||||
1950 | 28.00 | 34.82 | 40.65 | 49.90 | 53.10 | 58.20 | 67.33 | a | 61.84 | 57.22 | c | 48.10 | b | ----- | z | 36.13 | 48.66 | a | ||||||||
1951 | 32.97 | 35.86 | 39.37 | a | 47.17 | 56.00 | f | 60.37 | 67.71 | 62.29 | j | 57.47 | 45.07 | a | 34.53 | 29.74 | 45.02 | b | ||||||||
1952 | 29.81 | 36.07 | 38.90 | 46.13 | 54.84 | 55.80 | 66.03 | 65.23 | 58.27 | 49.26 | 33.97 | 30.52 | 47.07 | |||||||||||||
1953 | 33.42 | 29.04 | 38.65 | 45.20 | 47.83 | a | 57.13 | 69.72 | b | 62.23 | 57.93 | 48.35 | 40.79 | b | 29.77 | a | 46.67 | |||||||||
1954 | 33.48 | 38.32 | 39.00 | 51.03 | 56.39 | 60.47 | 71.00 | 62.16 | 57.27 | 47.19 | 42.32 | h | 32.19 | 49.86 | a | |||||||||||
1955 | 31.84 | 30.64 | 38.41 | d | 44.00 | e | 52.68 | 59.40 | 65.61 | 68.42 | 59.97 | 48.61 | 35.63 | 36.77 | 47.67 | |||||||||||
1956 | 36.55 | 31.28 | 37.68 | 43.83 | 51.32 | 60.73 | 65.97 | 61.32 | 60.83 | 46.03 | 33.63 | 30.32 | 46.63 | |||||||||||||
1957 | 33.45 | 42.68 | 43.81 | 47.34 | a | 51.29 | 64.63 | 67.13 | 66.55 | 59.60 | 49.16 | 36.60 | 32.26 | 49.54 | ||||||||||||
1958 | 32.23 | 42.07 | 38.87 | 46.60 | 56.53 | a | 61.33 | 66.35 | 69.61 | 59.87 | 50.32 | 37.87 | 32.19 | 49.49 | ||||||||||||
1959 | 34.35 | 35.96 | 42.37 | a | 51.45 | a | 52.10 | 64.57 | 72.87 | 65.74 | 59.77 | 50.23 | 37.17 | 32.20 | a | 49.90 | ||||||||||
1960 | 30.35 | 35.34 | 42.16 | 48.27 | 52.93 | a | 65.60 | 68.48 | 64.29 | 63.83 | 49.83 | a | 38.73 | 31.14 | b | 49.25 | ||||||||||
1961 | 30.39 | 35.21 | 41.68 | 47.53 | 51.81 | 65.27 | 71.03 | 67.23 | 57.37 | 50.03 | 37.33 | 32.48 | 48.95 | |||||||||||||
1962 | 32.16 | 38.46 | 38.10 | 50.17 | 50.94 | 61.47 | 66.23 | 66.19 | 60.00 | h | 50.00 | 40.63 | 30.84 | 47.74 | a | |||||||||||
1963 | 28.32 | 43.46 | 39.39 | 42.37 | 55.26 | 60.03 | 66.06 | 65.03 | 60.70 | 52.81 | ----- | z | 29.81 | 49.39 | a | |||||||||||
1964 | 30.19 | 31.55 | 37.61 | 45.27 | 51.77 | 59.20 | 67.16 | 67.19 | 56.43 | 54.55 | 36.97 | 37.39 | 47.94 | |||||||||||||
1965 | 33.58 | 35.68 | 41.35 | 47.07 | ----- | z | ----- | z | ----- | z | ----- | z | 49.78 | u | 47.19 | 41.37 | 31.26 | 39.64 | e | |||||||
1966 | 27.68 | 29.89 | 38.39 | 45.33 | 52.23 | 57.70 | 63.39 | ----- | z | 54.24 | a | 43.65 | 36.37 | 29.90 | 43.52 | a | ||||||||||
1967 | 29.84 | 32.50 | 39.94 | 37.20 | 52.45 | 56.43 | 69.97 | 69.39 | 61.77 | 47.23 | 42.33 | 29.81 | 47.40 | |||||||||||||
1968 | 29.74 | 40.45 | 39.42 | 42.83 | 53.13 | 61.27 | 67.39 | 61.84 | 57.03 | 46.84 | 39.13 | 26.65 | 47.14 | |||||||||||||
1969 | 36.81 | 33.79 | 37.58 | 44.60 | 54.42 | 59.13 | 67.42 | 66.42 | 60.30 | 44.45 | 36.60 | 30.58 | 47.67 | |||||||||||||
1970 | 31.68 | 36.43 | 39.68 | 40.80 | 52.48 | 60.17 | 68.71 | 68.23 | 53.23 | 45.77 | 38.53 | 31.10 | 47.23 | |||||||||||||
1971 | 28.35 | 32.54 | 38.58 | 41.67 | 49.23 | 59.27 | 67.03 | 69.39 | 58.53 | 42.39 | 35.00 | 29.16 | 45.93 | |||||||||||||
1972 | 26.10 | 32.48 | 42.65 | 45.37 | 52.55 | 60.83 | 68.13 | 65.10 | 57.80 | 47.00 | 36.17 | 27.97 | 46.84 | |||||||||||||
1973 | 28.55 | 35.96 | 37.87 | 44.33 | c | 53.58 | 62.53 | 65.81 | 66.52 | 54.80 | 44.81 | 38.27 | 31.06 | 47.01 | ||||||||||||
1974 | 33.45 | 33.07 | 42.45 | b | 41.53 | 53.55 | 62.10 | 67.23 | 62.97 | a | 61.17 | 48.23 | 34.97 | 28.94 | 47.47 | |||||||||||
1975 | 28.26 | 33.32 | 38.48 | 39.07 | 51.29 | 60.43 | 64.81 | 61.61 | 59.67 | 45.10 | 33.30 | 29.90 | 45.44 | |||||||||||||
1976 | 27.77 | a | 35.72 | 37.68 | 42.17 | 55.42 | 59.97 | 67.10 | 59.63 | a | 60.27 | 47.32 | 36.90 | 23.94 | 46.16 | |||||||||||
1977 | 30.77 | 32.96 | 32.61 | 44.60 | 48.13 | 60.73 | 65.97 | 66.13 | 57.63 | 48.84 | 36.67 | 36.87 | 46.83 | |||||||||||||
1978 | 36.81 | 38.18 | 44.10 | 44.17 | 50.87 | 60.97 | 64.52 | 64.29 | 55.87 | 50.71 | 34.90 | 26.65 | 47.67 | |||||||||||||
1979 | 31.45 | 32.86 | 39.26 | 44.70 | 53.13 | 60.77 | 64.42 | 64.26 | 62.67 | 52.26 | 38.90 | 34.52 | 48.27 | |||||||||||||
1980 | 40.42 | 41.86 | 40.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.06 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.50 | 35.44 | 39.78 | 45.47 | 52.35 | 60.27 | 66.60 | 64.66 | 57.90 | 47.56 | 37.13 | 31.30 | 47.50 | |||||||||||||
S.D. | 3.75 | 4.14 | 3.50 | 3.29 | 2.85 | 2.74 | 2.65 | 2.74 | 3.06 | 3.70 | 3.65 | 3.53 | 1.61 | |||||||||||||
SKEW | -0.38 | 0.74 | 0.68 | 0.07 | -0.22 | -0.04 | -0.48 | -0.16 | 0.41 | 0.56 | 2.02 | 0.51 | 0.14 | |||||||||||||
MAX | 40.42 | 48.93 | 51.87 | 52.43 | 57.83 | 66.17 | 72.87 | 69.61 | 66.87 | 58.97 | 54.30 | 41.61 | 51.55 | |||||||||||||
MIN | 17.67 | 25.00 | 31.00 | 37.20 | 45.90 | 53.80 | 58.48 | 57.84 | 52.93 | 39.55 | 29.07 | 23.03 | 43.95 | |||||||||||||
YRS | 55 | 53 | 53 | 53 | 51 | 51 | 51 | 50 | 51 | 53 | 51 | 53 | 41 |