YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1877 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.68 | 62.40 | 55.52 | 49.63 | 45.78 | 42.21 | 53.04 | f | ||||||
1878 | 41.09 | b | 43.79 | 47.69 | 48.80 | 55.05 | 59.65 | 61.03 | 62.40 | 54.98 | 47.69 | 45.57 | 40.03 | 50.65 | ||||||||||||
1879 | 36.35 | 40.91 | 44.68 | 48.18 | 52.53 | 57.10 | 60.81 | 62.66 | 57.83 | 48.60 | 41.77 | 37.87 | 49.11 | |||||||||||||
1880 | 36.69 | 37.76 | h | 39.98 | 47.22 | 50.65 | 57.25 | 62.24 | 59.84 | 55.55 | 52.50 | u | 39.88 | d | 40.07 | b | 48.94 | b | ||||||||
1881 | 39.15 | 44.04 | 47.48 | 50.85 | 52.90 | 57.68 | 60.06 | ----- | z | 56.33 | 47.58 | 43.40 | 41.98 | 49.22 | a | |||||||||||
1882 | 38.16 | 36.66 | 42.06 | 46.02 | 53.24 | 61.03 | 62.44 | 61.52 | 56.70 | 49.13 | 41.27 | 42.42 | 49.22 | |||||||||||||
1883 | 36.31 | 34.34 | 47.15 | 47.77 | 54.13 | ----- | z | 62.16 | 63.21 | 57.55 | 50.06 | 46.05 | 40.65 | 49.03 | a | |||||||||||
1884 | 39.98 | 34.81 | 43.47 | 51.72 | 57.08 | ----- | z | 61.50 | 65.87 | 55.75 | 51.29 | 48.18 | 33.81 | 49.41 | a | |||||||||||
1885 | 41.13 | 45.73 | 48.53 | 49.75 | 56.48 | 60.65 | 64.74 | 62.26 | 58.95 | 52.08 | 45.53 | 43.27 | 52.43 | |||||||||||||
1886 | 36.23 | 43.46 | 43.81 | b | 48.53 | 55.26 | 60.17 | 63.34 | 64.11 | 57.88 | 49.18 | 42.55 | 44.73 | 50.77 | ||||||||||||
1887 | 41.16 | 31.16 | 45.24 | 47.48 | 54.81 | 56.85 | 61.34 | 60.69 | 56.02 | 49.77 | 43.33 | 41.21 | 49.09 | |||||||||||||
1888 | 32.23 | 42.78 | 43.77 | 50.95 | 57.27 | 60.48 | 62.32 | 63.63 | 60.58 | 53.82 | 43.65 | 42.76 | 51.19 | |||||||||||||
1889 | 37.47 | b | 43.66 | 49.77 | 52.82 | 57.23 | 61.07 | 64.85 | 60.68 | 56.22 | 53.97 | 45.92 | 36.92 | 51.71 | ||||||||||||
1890 | 32.61 | 36.67 | b | 43.66 | 48.27 | 56.40 | 58.03 | 61.19 | 61.66 | 56.38 | 49.35 | 46.28 | 44.23 | 49.56 | ||||||||||||
1891 | 41.78 | d | 35.58 | b | 42.37 | 49.35 | 56.52 | 57.67 | 63.21 | 64.03 | 56.77 | 53.08 | 46.98 | 40.62 | b | 50.66 | ||||||||||
1892 | 39.39 | 42.07 | 47.90 | 47.10 | 55.42 | 59.83 | 61.37 | 63.13 | 59.73 | 51.55 | 45.95 | 38.50 | b | 51.00 | ||||||||||||
1893 | 37.04 | d | 37.04 | 42.50 | 44.85 | 52.73 | 54.83 | 61.03 | 61.90 | 55.38 | 47.14 | b | 40.92 | 42.85 | 48.18 | |||||||||||
1894 | 38.69 | 37.39 | 41.33 | b | 47.43 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.21 | h | |||
1895 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.88 | e | 40.88 | k |
1896 | 41.10 | 44.04 | a | 43.52 | 46.32 | b | 54.35 | e | 59.37 | 66.53 | 63.56 | 56.55 | 52.05 | 38.83 | i | 44.63 | e | 52.00 | a | |||||||
1897 | 39.28 | b | 41.57 | a | 39.77 | 51.83 | 57.82 | 58.80 | 61.40 | 66.84 | 56.70 | 50.66 | 43.64 | b | 42.68 | a | 50.92 | |||||||||
1898 | 39.23 | 44.05 | 42.55 | 49.12 | a | 55.02 | 60.30 | 64.20 | a | 65.20 | a | 59.75 | 50.35 | a | 44.96 | b | 39.61 | 51.20 | ||||||||
1899 | 40.67 | b | 38.98 | 43.28 | a | 47.82 | 50.81 | 57.52 | 64.11 | 59.97 | 60.28 | 50.74 | 50.28 | 43.23 | 50.64 | |||||||||||
1900 | 42.12 | a | 42.45 | 49.32 | 50.62 | 55.37 | 61.73 | 64.00 | 61.03 | 57.47 | 50.21 | 43.55 | 45.15 | 51.92 | ||||||||||||
1901 | 39.50 | b | 41.43 | 45.23 | 47.23 | 55.24 | b | 56.87 | 60.48 | 64.31 | 56.85 | 56.27 | a | 47.23 | 41.42 | 51.00 | ||||||||||
1902 | 39.03 | 44.96 | a | 44.63 | 48.98 | 55.08 | e | 58.93 | 62.77 | 63.08 | a | 57.25 | b | 54.34 | 45.27 | d | 40.77 | 51.26 | ||||||||
1903 | 42.29 | b | 38.72 | a | 42.60 | a | 47.52 | 54.68 | a | 61.95 | 61.88 | a | 63.23 | 58.62 | 53.37 | a | 45.33 | a | 42.00 | f | 51.84 | a | ||||
1904 | 41.27 | a | 38.26 | 41.78 | b | 52.42 | 54.63 | 59.58 | 64.56 | 63.37 | 60.30 | 53.89 | 47.17 | 41.77 | a | 51.58 | ||||||||||
1905 | 38.68 | c | 40.64 | 48.11 | 50.81 | a | 54.19 | 61.45 | 66.48 | 63.00 | 58.93 | 46.97 | b | 43.42 | 40.19 | 51.07 | ||||||||||
1906 | 40.58 | 41.89 | 43.94 | 51.45 | 54.52 | g | 58.10 | 69.19 | b | 64.67 | b | 58.10 | f | 54.18 | i | 49.55 | h | 46.29 | c | 52.01 | d | |||||
1907 | 33.13 | 42.14 | c | 42.03 | b | 49.12 | a | 57.74 | 60.97 | a | 64.76 | f | 62.44 | g | 58.72 | 53.52 | 46.38 | 41.02 | 48.48 | b | ||||||
1908 | 40.47 | o | 40.41 | 43.95 | 49.07 | 51.63 | a | 58.85 | 65.95 | b | 62.65 | 57.17 | 50.60 | a | 47.80 | 38.29 | b | 51.49 | a | |||||||
1909 | 34.11 | 41.30 | 44.02 | 47.20 | 51.58 | 58.87 | 60.81 | 60.82 | 58.35 | 51.29 | 44.95 | 34.55 | a | 48.99 | ||||||||||||
1910 | 36.92 | 37.68 | 48.15 | a | 48.90 | 56.52 | 57.40 | 62.19 | 59.84 | 56.42 | 52.27 | 44.58 | 41.87 | a | 50.23 | |||||||||||
1911 | 37.05 | a | 38.37 | a | 44.63 | 45.92 | 52.27 | a | 57.09 | a | 65.24 | b | 62.41 | c | 55.78 | 51.43 | a | 44.20 | 40.44 | 49.57 | ||||||
1912 | 40.78 | b | 42.84 | 43.58 | a | 47.82 | 56.47 | 60.02 | d | 63.90 | a | 62.00 | a | 57.85 | 48.21 | 44.53 | a | 40.60 | 50.72 | |||||||
1913 | 36.25 | a | 38.74 | a | 41.85 | 49.02 | 54.00 | 60.53 | a | 62.93 | c | 63.97 | 58.50 | 49.79 | 44.65 | 41.26 | 50.12 | |||||||||
1914 | 42.68 | 42.68 | 47.81 | 51.63 | 58.50 | 59.87 | 65.57 | b | 64.66 | b | 56.95 | 54.53 | a | 46.42 | 37.23 | a | 52.38 | |||||||||
1915 | 38.69 | 43.70 | 48.92 | 53.03 | 55.11 | 59.77 | 63.92 | 66.39 | 58.72 | a | 53.12 | c | 43.54 | c | 42.33 | a | 52.27 | |||||||||
1916 | 30.26 | b | 41.71 | 44.30 | a | 50.08 | 52.82 | 58.93 | 61.61 | 65.05 | 60.24 | a | 48.52 | 44.33 | 38.13 | a | 49.67 | |||||||||
1917 | 37.85 | a | 39.59 | 41.74 | 47.47 | 53.35 | 59.18 | 64.13 | 65.24 | 57.38 | 52.87 | a | 49.40 | 45.18 | 51.12 | |||||||||||
1918 | 41.24 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.24 | k | |
1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.42 | l | ----- | z | 46.33 | k | 44.03 | ----- | z | 44.03 | k | |
1920 | 39.71 | b | 40.83 | b | 44.80 | a | ----- | z | 52.34 | 59.83 | 65.72 | b | 65.76 | 59.50 | 51.78 | a | 45.65 | 41.92 | a | 51.62 | a | |||||
1921 | 38.76 | 41.35 | a | 44.90 | 45.00 | d | 53.33 | d | 60.83 | 60.63 | a | 62.95 | 56.63 | 52.50 | 47.02 | 38.03 | 50.16 | |||||||||
1922 | 34.58 | s | ----- | z | 40.13 | 46.30 | 55.76 | b | 63.36 | b | 63.73 | ----- | z | 61.42 | 54.61 | 40.80 | ----- | z | 53.26 | d | ||||||
1923 | ----- | z | ----- | z | ----- | z | 50.87 | 54.63 | 60.53 | 64.73 | e | 66.65 | 60.37 | 53.10 | 46.17 | 41.38 | b | 55.38 | c | |||||||
1924 | 38.28 | a | 45.75 | a | 44.65 | 50.80 | 59.97 | 62.12 | ----- | z | 69.92 | ----- | z | ----- | z | ----- | z | ----- | z | 53.07 | e | |||||
1925 | ----- | z | 44.23 | d | 44.63 | 49.87 | o | 57.32 | 59.50 | 64.68 | 62.68 | a | 58.07 | h | 49.98 | d | 43.47 | 44.20 | a | 52.30 | c | |||||
1926 | 41.36 | b | 44.69 | a | 48.97 | a | 54.85 | 55.53 | a | 61.34 | b | 65.42 | 64.02 | a | 56.12 | b | 53.57 | b | 47.30 | b | 40.17 | a | 52.78 | |||
1927 | 38.78 | a | 41.62 | 43.29 | 48.53 | a | 51.31 | 61.50 | 64.13 | a | 64.74 | 57.17 | d | 53.32 | c | 45.43 | 36.90 | a | 50.56 | |||||||
1928 | 40.10 | b | 41.14 | 47.65 | 46.92 | 57.05 | 60.43 | 65.71 | 64.10 | 58.62 | a | 52.08 | 45.45 | a | 39.71 | 51.58 | ||||||||||
1929 | 34.27 | a | 33.17 | a | 43.57 | b | 45.48 | d | 54.24 | 58.71 | a | 63.56 | 64.87 | 59.47 | 53.04 | c | 42.14 | a | 41.09 | c | 49.47 | |||||
1930 | 28.69 | b | 41.27 | b | 45.02 | a | 50.80 | b | 53.47 | 59.05 | 62.63 | 65.95 | 58.62 | 46.50 | d | 42.98 | b | 38.73 | a | 49.48 | ||||||
1931 | 41.93 | a | 41.16 | 45.50 | a | 50.36 | a | 57.92 | 59.00 | a | 64.95 | 63.97 | 59.07 | 52.15 | d | 42.68 | h | 38.09 | b | 52.19 | a | |||||
1932 | 38.23 | c | 38.10 | 44.53 | 49.35 | c | 54.63 | 60.98 | a | 60.88 | a | 63.50 | 59.91 | a | 52.05 | 46.03 | a | 35.74 | b | 50.33 | ||||||
1933 | 37.39 | c | 35.23 | 42.98 | b | 48.48 | b | 51.08 | 58.20 | 61.84 | 63.89 | 55.67 | 51.88 | b | 45.21 | d | 42.85 | a | 49.56 | |||||||
1934 | 42.81 | 44.65 | a | 49.53 | a | 54.12 | 56.97 | a | 60.72 | 62.76 | 64.26 | 57.86 | a | 52.55 | 46.78 | 41.02 | d | 52.83 | ||||||||
1935 | 38.20 | a | 40.61 | a | 40.18 | a | 47.83 | 54.45 | 59.77 | b | 63.16 | 63.03 | b | 60.19 | a | 48.85 | 39.93 | a | 39.65 | 49.66 | ||||||
1936 | 40.82 | 33.50 | b | 41.66 | 50.78 | a | 56.40 | a | 60.47 | 63.85 | 65.37 | 58.33 | a | 53.31 | 42.05 | 41.88 | a | 50.70 | ||||||||
1937 | 29.16 | 37.52 | 46.38 | a | 47.85 | 54.81 | 61.15 | 64.74 | 63.03 | 59.95 | 56.56 | 50.15 | g | 42.64 | c | 51.25 | a | |||||||||
1938 | 40.15 | a | 41.94 | d | 44.84 | c | 52.26 | a | 57.50 | a | 62.20 | 66.52 | 62.42 | 60.93 | 51.88 | a | 42.19 | a | 39.76 | b | 51.88 | |||||
1939 | 41.17 | b | 36.06 | a | 41.63 | 51.65 | 55.98 | a | 59.35 | 65.77 | 66.39 | 60.55 | 53.71 | 47.52 | a | 44.62 | c | 52.03 | ||||||||
1940 | 41.12 | a | 44.21 | 48.39 | 53.17 | a | 59.73 | 64.22 | 65.24 | 66.45 | 63.02 | a | 54.52 | a | 42.08 | 42.65 | a | 53.73 | ||||||||
1941 | 42.32 | 43.93 | a | 51.34 | 55.50 | 57.21 | 62.81 | a | 69.42 | 65.81 | 59.69 | a | 54.05 | 46.98 | a | 41.39 | c | 54.20 | ||||||||
1942 | 37.18 | a | 41.35 | b | 44.60 | 51.36 | b | 56.48 | c | 61.18 | 67.95 | a | 67.90 | 61.28 | 53.11 | 43.28 | 41.93 | a | 52.30 | |||||||
1943 | 33.27 | 41.57 | 42.31 | 50.80 | 53.00 | 58.43 | 63.55 | 61.92 | 60.38 | 51.84 | 44.30 | 38.31 | 49.97 | |||||||||||||
1944 | 39.32 | 40.41 | 43.45 | 49.27 | 53.90 | 58.61 | b | 64.05 | 63.16 | 61.45 | 54.60 | 44.92 | 36.16 | 50.77 | ||||||||||||
1945 | 40.73 | 41.89 | a | 43.45 | 48.07 | 57.87 | 60.07 | 66.88 | a | 65.10 | a | 58.38 | 52.69 | 45.74 | a | 41.82 | c | 51.89 | ||||||||
1946 | 41.74 | 41.66 | 45.13 | 49.60 | a | 59.42 | a | 59.23 | 65.17 | a | 65.18 | 59.32 | 49.47 | 41.09 | a | 39.16 | b | 51.35 | ||||||||
1947 | 34.80 | a | 42.11 | a | 48.73 | a | 53.48 | a | 59.87 | 61.17 | 64.22 | a | 63.66 | 60.15 | 52.16 | 44.82 | b | 41.26 | d | 52.20 | ||||||
1948 | 38.20 | d | 38.89 | b | 43.11 | 46.11 | b | 54.33 | b | 63.35 | 63.55 | a | 61.68 | 57.97 | 49.64 | b | 42.60 | 35.45 | 49.57 | |||||||
1949 | 28.98 | 36.46 | 44.63 | 50.67 | 58.05 | 59.08 | 63.15 | 63.85 | 60.50 | 47.21 | b | 48.85 | 38.68 | 50.01 | ||||||||||||
1950 | 27.87 | 38.66 | 40.74 | 46.15 | 52.98 | 61.17 | 65.69 | 64.90 | 59.95 | 49.79 | 42.98 | 43.21 | g | 50.08 | a | |||||||||||
1951 | 38.13 | 40.32 | 40.29 | 51.58 | 54.52 | 62.43 | 65.55 | 63.89 | 59.82 | 51.84 | 43.93 | 38.05 | 50.86 | |||||||||||||
1952 | 36.75 | a | 41.36 | a | 44.11 | 50.17 | 55.90 | a | 58.13 | 64.82 | 64.53 | 61.92 | 54.90 | 41.82 | 40.35 | 51.23 | ||||||||||
1953 | 44.06 | 42.30 | 44.82 | a | 48.59 | a | 54.90 | a | 57.43 | 64.15 | 64.37 | 60.30 | 53.73 | 46.57 | ----- | z | 52.84 | a | ||||||||
1954 | 37.05 | b | 42.32 | 42.42 | 47.67 | 54.76 | 55.48 | a | 59.71 | 60.56 | 58.45 | 49.15 | 48.20 | 40.00 | 49.65 | |||||||||||
1955 | 39.52 | b | 39.21 | 40.30 | a | 45.52 | a | 53.08 | a | 59.16 | a | 60.03 | b | 62.45 | a | 58.12 | a | 51.02 | a | 38.47 | 38.92 | a | 48.82 | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 38.18 | 40.50 | 44.46 | 49.32 | 55.14 | 59.71 | 63.65 | 63.67 | 58.44 | 51.56 | 44.67 | 40.62 | 50.82 | |||||||||||||
S.D. | 3.59 | 3.20 | 2.71 | 2.41 | 2.21 | 1.83 | 2.11 | 1.93 | 1.85 | 2.31 | 2.37 | 2.59 | 1.26 | |||||||||||||
SKEW | -1.13 | -0.72 | 0.45 | 0.33 | 0.10 | -0.09 | 0.33 | 0.33 | 0.09 | -0.23 | -0.19 | -0.32 | 0.35 | |||||||||||||
MAX | 44.06 | 45.75 | 51.34 | 55.50 | 59.97 | 64.22 | 69.42 | 69.92 | 63.02 | 56.56 | 50.28 | 46.29 | 54.20 | |||||||||||||
MIN | 27.87 | 31.16 | 39.77 | 44.85 | 50.65 | 54.83 | 59.71 | 59.84 | 54.98 | 46.50 | 38.47 | 33.81 | 48.18 | |||||||||||||
YRS | 72 | 72 | 74 | 73 | 73 | 72 | 73 | 72 | 72 | 72 | 71 | 71 | 56 |