YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1895 | ----- | z | ----- | z | 46.33 | a | 50.23 | 53.98 | b | 60.12 | 63.03 | 62.15 | 54.63 | 57.05 | 45.07 | ----- | z | 54.73 | c | |||||||
1896 | 42.81 | 45.57 | a | 42.63 | 45.70 | 51.71 | 59.16 | a | 65.26 | ----- | z | ----- | z | ----- | z | 44.25 | b | 47.09 | c | 49.35 | c | |||||
1897 | 41.34 | b | 43.27 | 40.79 | b | 53.12 | 58.69 | 58.85 | 60.37 | 65.15 | 58.45 | 53.13 | 44.33 | 43.27 | 51.73 | |||||||||||
1898 | 40.29 | 44.62 | 43.34 | 48.60 | 54.65 | 58.92 | 61.61 | 61.24 | 61.20 | 52.02 | 44.67 | 41.34 | b | 51.04 | ||||||||||||
1899 | 41.30 | d | 40.37 | b | 42.77 | 47.15 | 48.56 | 54.30 | b | 61.48 | 59.27 | 61.07 | 51.19 | 52.37 | 44.31 | 50.35 | ||||||||||
1900 | 45.08 | 42.84 | f | 51.10 | 52.45 | 54.68 | a | 58.92 | 63.44 | 60.89 | 58.33 | 51.48 | 46.38 | 46.65 | 53.58 | a | ||||||||||
1901 | 40.18 | a | 40.85 | a | 44.06 | 45.69 | a | 51.40 | a | 54.28 | 57.71 | b | 61.90 | 56.83 | 57.40 | 49.20 | 42.77 | 50.19 | ||||||||
1902 | 40.44 | 45.64 | 43.92 | 47.75 | v | 54.47 | b | 57.37 | 60.57 | b | 61.69 | 58.91 | a | 55.02 | b | 45.64 | b | 41.91 | c | 51.42 | a | |||||
1903 | 43.10 | b | 40.91 | 42.09 | b | 45.84 | b | 52.35 | e | 57.98 | c | 59.72 | b | 60.76 | f | 56.38 | b | 55.41 | b | 46.22 | c | 42.84 | 49.35 | a | ||
1904 | 41.64 | b | 38.98 | f | 41.16 | b | 51.69 | a | 51.83 | a | 56.71 | a | 63.33 | a | ----- | z | 62.89 | g | 58.02 | a | 54.64 | a | 43.54 | d | 51.39 | c |
1905 | 41.78 | b | 46.58 | c | 53.76 | l | 54.50 | 54.10 | b | 58.16 | a | 62.79 | 61.57 | a | 62.78 | u | 47.47 | o | ----- | z | 41.72 | f | 54.21 | e | ||
1906 | 43.35 | 45.98 | 45.04 | c | 50.50 | f | 54.63 | e | 55.85 | j | 69.59 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.72 | g | ||
1907 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.00 | k | 61.14 | b | 50.12 | 43.38 | e | 51.55 | i | |
1908 | 42.00 | k | 41.70 | a | 44.26 | j | 49.14 | a | 50.63 | d | 52.72 | u | 64.35 | a | 59.00 | d | 60.43 | i | 51.88 | f | 49.94 | e | 41.62 | f | 52.46 | f |
1909 | 34.48 | 41.13 | a | 45.60 | 46.29 | a | 53.92 | 59.12 | 60.40 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.71 | e | ||||
1910 | 34.23 | r | 40.15 | h | 47.32 | 47.82 | 54.16 | 54.06 | d | 60.11 | 59.33 | m | 57.13 | 52.84 | 45.21 | f | 43.07 | h | 53.35 | e | ||||||
1911 | 38.89 | m | 39.20 | 46.23 | 44.57 | 50.21 | 54.57 | 60.47 | 58.97 | b | 55.52 | 52.95 | 45.38 | 42.16 | 50.02 | a | ||||||||||
1912 | 43.05 | 44.41 | 44.63 | 46.48 | ----- | z | 58.25 | b | 61.42 | 61.52 | 58.82 | 49.31 | 45.23 | 41.23 | 50.39 | a | ||||||||||
1913 | 36.63 | 40.45 | 41.34 | 45.93 | 50.16 | 55.63 | ----- | z | 60.95 | 58.55 | 49.18 | 46.23 | 42.27 | 47.94 | a | |||||||||||
1914 | 42.97 | 43.80 | 47.73 | 49.87 | 56.26 | 55.67 | 60.45 | 60.52 | 55.82 | 54.92 | 46.80 | 38.68 | 51.12 | |||||||||||||
1915 | 40.53 | 43.41 | 50.33 | a | 51.45 | 53.87 | 57.68 | 61.11 | 63.55 | 59.30 | 53.03 | l | 43.15 | 40.94 | 51.39 | a | ||||||||||
1916 | 30.52 | 44.28 | 43.74 | 48.00 | 49.45 | 55.85 | 58.08 | 59.84 | 57.73 | d | 50.10 | 41.23 | 36.85 | 47.97 | ||||||||||||
1917 | 37.40 | 38.77 | 39.21 | 45.46 | g | 49.40 | 52.65 | 58.35 | 60.36 | x | 56.87 | 51.33 | b | 48.80 | 45.97 | 47.88 | b | |||||||||
1918 | 43.98 | 38.82 | 41.39 | 46.47 | 47.35 | 56.65 | 60.73 | 62.08 | 62.45 | 54.81 | ----- | z | ----- | z | 51.47 | b | ||||||||||
1919 | ----- | z | ----- | z | ----- | z | 49.82 | 53.10 | 56.93 | 61.24 | 62.24 | 59.83 | 51.06 | 45.17 | 38.35 | 53.08 | c | |||||||||
1920 | 41.37 | 43.43 | 45.10 | 45.75 | 50.23 | 56.18 | 61.29 | 62.89 | 57.45 | 51.05 | 44.47 | 41.90 | 50.09 | |||||||||||||
1921 | 38.94 | 41.11 | 43.61 | 46.72 | 50.76 | 56.53 | 57.76 | 59.74 | 55.50 | 52.63 | 45.35 | 37.77 | 48.87 | |||||||||||||
1922 | 34.85 | 37.14 | 39.52 | 44.25 | 51.87 | 57.73 | 60.00 | 61.02 | 59.75 | 53.50 | 43.27 | 37.32 | 48.35 | |||||||||||||
1923 | 40.39 | 38.02 | 44.10 | 50.02 | a | 52.95 | 58.32 | 62.27 | 65.52 | 60.67 | 54.06 | 48.55 | 41.55 | 51.37 | ||||||||||||
1924 | 40.63 | 45.36 | 43.63 | 47.32 | 54.81 | 57.55 | 60.45 | 60.19 | 58.52 | a | 51.48 | 44.73 | 36.60 | 50.11 | ||||||||||||
1925 | 41.94 | 44.15 | a | 43.92 | 49.28 | 55.40 | 57.45 | 61.50 | 61.66 | 59.75 | 53.03 | 46.72 | 46.00 | b | 51.73 | |||||||||||
1926 | 43.76 | 47.29 | 50.55 | j | 56.21 | b | 56.69 | b | ----- | z | 64.90 | b | 64.41 | d | 58.78 | a | 56.44 | d | 50.37 | g | 42.36 | q | 56.06 | d | ||
1927 | 41.93 | p | 44.16 | c | 44.73 | i | 48.63 | c | 52.22 | a | 60.66 | a | 62.85 | a | 63.78 | a | 60.77 | 54.85 | g | 49.04 | r | 38.97 | o | 56.15 | e | |
1928 | 43.79 | l | 43.60 | 47.79 | 47.72 | g | 56.55 | a | 57.75 | f | 63.28 | h | 61.45 | 57.20 | 52.03 | a | 45.88 | 40.88 | c | 50.67 | d | |||||
1929 | 35.65 | a | 36.84 | 44.40 | 45.28 | 52.28 | a | 57.25 | 61.73 | 62.65 | 61.12 | 54.53 | 44.80 | 42.30 | a | 49.90 | ||||||||||
1930 | 30.87 | 43.18 | 46.94 | 51.97 | a | 50.61 | 56.50 | 59.08 | 63.24 | 58.53 | a | 51.71 | 46.50 | 42.68 | 50.15 | |||||||||||
1931 | 46.21 | c | 44.43 | a | 47.03 | a | 51.42 | 57.34 | 58.32 | 64.41 | b | 62.32 | 58.25 | 52.70 | a | 43.35 | 41.34 | 52.26 | ||||||||
1932 | 39.23 | 40.95 | 46.08 | 49.57 | 52.34 | 57.91 | a | 57.70 | d | 60.92 | 59.27 | 53.85 | 48.62 | 38.15 | a | 50.38 | ||||||||||
1933 | 39.08 | 38.16 | 44.40 | a | 48.07 | 48.84 | 56.42 | 59.65 | 63.67 | b | 55.76 | c | 53.92 | 47.63 | 46.05 | a | 50.14 | |||||||||
1934 | 45.31 | 49.02 | 50.45 | 55.02 | a | 56.82 | 57.85 | 59.75 | a | 62.50 | 58.22 | a | 54.61 | 48.37 | 44.08 | 53.50 | ||||||||||
1935 | 40.84 | 45.67 | a | 41.16 | 48.16 | b | 53.37 | 57.82 | 60.19 | 62.15 | 59.75 | 51.58 | 43.58 | 43.42 | 50.64 | |||||||||||
1936 | 43.35 | 37.84 | 42.37 | 51.30 | ----- | z | ----- | z | 62.24 | 64.65 | 59.52 | 57.00 | 47.63 | 43.82 | 50.97 | b | ||||||||||
1937 | 33.39 | 41.48 | 48.27 | 46.83 | 54.27 | 59.63 | 61.95 | 62.37 | 61.27 | 57.82 | 48.95 | b | 44.93 | d | 51.76 | |||||||||||
1938 | 42.90 | 43.39 | 45.29 | 50.15 | 52.43 | a | 56.19 | a | 61.29 | 57.11 | 59.80 | 53.39 | c | 44.98 | 42.44 | 50.78 | ||||||||||
1939 | 42.87 | 40.25 | 45.44 | 51.33 | a | 54.81 | 56.63 | 62.32 | 64.28 | a | 60.32 | 54.32 | 50.60 | a | 47.16 | 52.53 | ||||||||||
1940 | 44.10 | 45.66 | 49.35 | 52.40 | a | 57.23 | 61.60 | a | 62.05 | a | 64.98 | 62.27 | 56.86 | b | 44.87 | 44.98 | 53.86 | |||||||||
1941 | 45.18 | 47.55 | 52.13 | 52.32 | 54.15 | 56.40 | ----- | z | ----- | z | 58.28 | 54.94 | 48.58 | 43.10 | 51.26 | b | ||||||||||
1942 | 41.85 | 43.44 | d | 45.10 | 50.58 | 53.94 | 58.18 | 64.42 | 63.90 | 59.95 | 55.65 | 44.75 | 43.50 | 52.10 | ||||||||||||
1943 | 36.57 | a | 45.93 | 44.31 | 51.03 | 52.15 | 56.95 | 60.68 | 61.03 | 61.43 | 53.58 | 48.15 | 42.24 | 51.17 | ||||||||||||
1944 | 42.27 | 42.98 | 44.74 | 49.33 | 53.73 | 56.88 | 61.15 | 61.79 | 61.31 | a | 57.26 | 46.65 | 41.03 | 51.59 | ||||||||||||
1945 | 43.90 | 43.27 | 43.69 | 46.83 | 54.89 | 57.30 | 62.06 | 61.15 | 57.90 | a | 53.15 | a | 44.42 | 41.58 | 50.84 | |||||||||||
1946 | 41.70 | a | 42.12 | 44.52 | 47.90 | a | 55.27 | 56.35 | 61.39 | 61.24 | 58.20 | 49.26 | 42.93 | 41.61 | 50.21 | |||||||||||
1947 | 37.48 | 45.81 | a | 48.61 | 52.00 | 56.66 | 58.08 | 61.31 | 61.11 | 60.54 | b | 53.13 | a | 45.77 | 43.60 | 52.01 | ||||||||||
1948 | 40.82 | 40.31 | ----- | z | ----- | z | ----- | z | 60.84 | a | 60.71 | 60.15 | 58.58 | 51.53 | 43.35 | 37.63 | 50.44 | c | ||||||||
1949 | 32.26 | 39.77 | 45.73 | 49.42 | 54.89 | 56.48 | 59.53 | 60.79 | 59.85 | 49.47 | 50.75 | 40.19 | 49.93 | |||||||||||||
1950 | 30.15 | 41.00 | 42.52 | 46.40 | 50.53 | 58.43 | 60.44 | 62.27 | 58.31 | d | 49.55 | 44.68 | 46.87 | 49.26 | ||||||||||||
1951 | 39.29 | 42.91 | 41.16 | 50.73 | 53.53 | 58.52 | 61.02 | 60.63 | 58.60 | 52.81 | 45.72 | a | 38.81 | 50.31 | ||||||||||||
1952 | 38.10 | 42.10 | 42.84 | 48.58 | 52.95 | 55.45 | 60.90 | 61.10 | 61.18 | 57.31 | 44.68 | b | 42.44 | 50.64 | ||||||||||||
1953 | 45.06 | f | 43.57 | 45.02 | 48.45 | 52.93 | b | 56.20 | 61.02 | f | 61.74 | 59.21 | f | 55.05 | 48.43 | 44.04 | c | 50.60 | c | |||||||
1954 | 38.22 | b | 44.18 | 42.68 | 46.73 | 54.10 | 54.77 | 57.95 | 59.40 | b | 59.15 | 53.13 | 50.17 | 42.08 | 50.21 | |||||||||||
1955 | 40.76 | 41.21 | 40.94 | 44.28 | 50.12 | a | 56.17 | 57.97 | 60.05 | 57.88 | 52.31 | 41.83 | 40.80 | a | 48.69 | |||||||||||
1956 | 40.40 | a | 38.10 | 42.90 | 51.58 | 56.87 | 56.45 | 63.12 | a | 62.42 | 58.83 | 51.02 | a | 45.60 | 42.06 | 50.78 | ||||||||||
1957 | 35.66 | 42.09 | 45.94 | 50.68 | 56.08 | 58.70 | 60.74 | 61.42 | 63.95 | 53.45 | 45.98 | 44.34 | 51.59 | |||||||||||||
1958 | 45.16 | 48.98 | 45.21 | 50.24 | a | 59.30 | a | 62.57 | 65.69 | 64.44 | 60.33 | 55.15 | 45.33 | 47.15 | 54.13 | |||||||||||
1959 | 42.35 | 42.50 | 45.77 | 50.03 | 54.05 | 58.38 | 62.76 | 60.60 | a | 58.10 | 53.98 | 46.73 | 42.52 | 51.48 | ||||||||||||
1960 | 39.97 | 42.66 | a | 45.29 | 50.43 | 52.45 | 57.85 | 62.32 | 61.19 | 59.65 | 54.31 | b | 46.17 | a | 42.87 | 51.26 | ||||||||||
1961 | 46.79 | 45.82 | 46.13 | 47.58 | 52.34 | i | 61.33 | 63.87 | 64.38 | a | 58.65 | 51.63 | 43.17 | 42.08 | 51.95 | a | ||||||||||
1962 | 40.71 | 44.50 | 43.56 | 49.45 | 51.15 | 56.42 | 59.93 | a | 61.88 | a | 60.34 | b | 54.21 | 48.03 | 44.20 | a | 51.20 | |||||||||
1963 | 38.32 | a | 49.48 | 45.31 | 49.20 | 55.26 | 57.62 | 60.89 | 62.95 | 63.15 | 55.00 | 46.67 | a | 44.34 | 52.35 | |||||||||||
1964 | 42.77 | 43.16 | 44.61 | 46.53 | 51.53 | b | 57.23 | 60.44 | 61.56 | 58.93 | 53.73 | a | 43.95 | 38.02 | a | 50.21 | ||||||||||
1965 | 40.66 | 43.04 | a | 46.98 | 49.13 | 50.90 | 53.46 | b | ----- | z | ----- | z | ----- | z | 54.94 | ----- | z | 38.09 | h | 48.45 | e | |||||
1966 | 43.58 | a | 42.30 | 44.68 | a | 49.97 | 53.82 | 58.07 | 61.42 | 63.00 | 61.60 | 52.32 | a | 46.50 | 44.68 | 51.83 | ||||||||||
1967 | 43.15 | 43.20 | 42.72 | a | 45.43 | 54.15 | 62.14 | a | 65.00 | a | 68.39 | 63.42 | 53.40 | 46.93 | 40.79 | 52.39 | ||||||||||
1968 | 41.12 | a | 46.90 | 47.42 | a | 47.33 | 55.03 | 58.30 | 64.19 | 61.95 | a | 60.32 | 52.10 | 47.19 | a | 38.89 | 51.73 | |||||||||
1969 | 34.77 | a | 40.71 | 46.18 | 48.32 | 57.13 | 63.00 | 61.48 | 60.89 | 59.40 | 51.55 | 46.10 | a | 43.77 | 51.11 | |||||||||||
1970 | 41.69 | 46.63 | a | 45.65 | 46.23 | 54.08 | 61.55 | 62.48 | 62.50 | 56.82 | 51.10 | 45.88 | 39.89 | 51.21 | ||||||||||||
1971 | 41.45 | b | 42.18 | 41.95 | 47.73 | 54.61 | 55.02 | 62.05 | 64.82 | a | 57.80 | 51.35 | 45.70 | 39.02 | 50.31 | |||||||||||
1972 | 38.18 | 42.21 | 46.56 | 45.25 | 56.16 | 58.93 | 64.16 | 65.08 | 57.10 | 50.73 | 45.97 | 38.08 | a | 50.70 | ||||||||||||
1973 | 39.71 | 43.88 | 44.65 | 48.70 | 55.45 | 58.21 | a | 61.68 | 58.81 | 60.93 | a | 51.97 | 42.50 | 43.73 | a | 50.85 | ||||||||||
1974 | 38.21 | b | 41.76 | a | 44.74 | 49.07 | b | 51.77 | 58.18 | 61.00 | 63.37 | a | 63.73 | b | 53.11 | 46.52 | 43.11 | 51.21 | ||||||||
1975 | 40.53 | a | 41.84 | 42.47 | 44.74 | a | 53.92 | 56.88 | 62.18 | 60.14 | b | 60.87 | 51.23 | 45.08 | 42.64 | f | 50.90 | a | ||||||||
1976 | 42.40 | 40.97 | 42.29 | 47.87 | 54.20 | a | 56.69 | a | 61.65 | 61.35 | a | 60.92 | 53.79 | 47.48 | 43.23 | 51.07 | ||||||||||
1977 | 39.34 | 46.09 | a | 43.08 | 50.00 | a | 50.94 | 59.40 | 61.81 | 65.39 | 57.78 | 51.40 | a | 42.68 | 42.73 | 50.89 | ||||||||||
1978 | 43.62 | a | 47.19 | a | 48.95 | 50.47 | 55.73 | c | 62.65 | 64.10 | 64.50 | a | 60.57 | c | 55.69 | 41.07 | 37.27 | a | 52.65 | |||||||
1979 | 36.00 | 41.75 | 48.23 | a | 50.32 | 55.94 | d | 58.50 | 65.21 | 65.73 | a | 62.70 | 55.39 | 45.05 | a | 43.88 | a | 52.39 | ||||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 40.28 | 42.97 | 44.81 | 48.88 | 53.52 | 57.68 | 61.60 | 62.09 | 59.31 | 53.40 | 46.11 | 42.20 | 51.02 | |||||||||||||
S.D. | 3.62 | 2.81 | 2.62 | 2.55 | 2.43 | 2.08 | 2.08 | 1.95 | 2.00 | 2.33 | 2.46 | 2.64 | 1.22 | |||||||||||||
SKEW | -0.90 | 0.03 | 0.43 | 0.35 | -0.15 | 0.40 | 0.67 | 0.42 | 0.11 | 0.54 | 0.68 | -0.26 | 0.06 | |||||||||||||
MAX | 46.79 | 49.48 | 52.13 | 56.21 | 59.30 | 63.00 | 69.59 | 68.39 | 63.95 | 61.14 | 54.64 | 47.16 | 54.13 | |||||||||||||
MIN | 30.15 | 36.84 | 39.21 | 44.25 | 47.35 | 52.65 | 57.70 | 57.11 | 54.63 | 49.18 | 41.07 | 36.60 | 47.97 | |||||||||||||
YRS | 76 | 79 | 78 | 79 | 80 | 79 | 79 | 75 | 76 | 78 | 77 | 74 | 56 |