YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1915 | ----- | z | ----- | z | ----- | z | ----- | z | 40.45 | 46.57 | 52.41 | b | 49.74 | 46.40 | 41.65 | 32.07 | 28.74 | 42.25 | d | |||||||
1916 | 28.65 | 33.79 | a | 36.65 | 35.90 | 37.71 | n | 44.41 | h | 50.77 | 50.77 | 45.97 | 37.52 | ----- | z | ----- | z | 40.00 | d | |||||||
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 | 37.39 | 37.39 | k | |
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 | 31.43 | 32.13 | 36.57 | 40.52 | 46.40 | 52.68 | 53.35 | 49.23 | 36.74 | 25.47 | 30.17 | a | 39.52 | a | ||||||||||
1939 | 28.16 | 24.54 | 32.52 | 38.53 | 41.71 | 45.79 | a | 52.97 | 53.03 | 48.73 | 36.06 | 31.93 | 29.97 | 38.66 | ||||||||||||
1940 | 32.48 | 31.11 | a | 34.23 | 38.07 | 41.55 | 49.47 | 49.07 | a | 51.97 | 42.47 | 38.55 | 29.07 | 31.10 | 39.09 | |||||||||||
1941 | 31.19 | 34.54 | 35.29 | 35.00 | 42.42 | 43.37 | 52.03 | 47.87 | 38.93 | 37.42 | 32.03 | 29.32 | 38.28 | |||||||||||||
1942 | 27.26 | 25.64 | 30.16 | 37.50 | 38.00 | 43.59 | a | 54.06 | 52.94 | 41.10 | 38.94 | 32.23 | 27.68 | 37.42 | ||||||||||||
1943 | 27.87 | 31.79 | 36.84 | 39.93 | 41.97 | 42.83 | 49.73 | a | 49.03 | 47.37 | 40.77 | 30.10 | 30.10 | 39.03 | ||||||||||||
1944 | 27.81 | 28.56 | d | 32.58 | 35.17 | 41.97 | 42.50 | 46.83 | a | 48.58 | 46.33 | 38.58 | 33.23 | 29.13 | 37.61 | |||||||||||
1945 | 27.29 | 31.54 | 30.00 | 34.67 | 39.71 | 45.93 | 55.74 | 52.71 | 48.43 | 41.65 | 30.00 | 27.35 | 38.75 | |||||||||||||
1946 | 26.58 | 26.79 | 32.52 | 38.60 | 42.23 | 45.13 | 54.81 | 53.74 | 47.80 | 37.26 | 30.53 | 32.68 | 39.05 | |||||||||||||
1947 | 26.26 | 32.21 | 35.55 | 37.83 | 44.74 | 47.23 | 49.15 | d | 50.97 | 51.57 | 40.81 | 28.93 | 27.40 | a | 39.39 | |||||||||||
1948 | 30.37 | a | 27.55 | 27.71 | 38.27 | 38.55 | 48.57 | 57.10 | b | 54.53 | l | 48.67 | 41.81 | 30.83 | 26.03 | 37.77 | a | |||||||||
1949 | 18.35 | h | 24.43 | 30.29 | 38.80 | 41.45 | 50.34 | a | 54.29 | 49.58 | 49.73 | 39.29 | 37.57 | b | 25.68 | 40.13 | a | |||||||||
1950 | 23.65 | 32.73 | b | 33.48 | 39.63 | c | 42.00 | a | 46.20 | 58.67 | a | 53.10 | a | 48.03 | 44.04 | g | 36.43 | b | 33.17 | h | 41.39 | b | ||||
1951 | 27.96 | c | 28.57 | g | 32.30 | d | 38.27 | 42.68 | 47.27 | 57.21 | c | 54.81 | 51.57 | b | 41.13 | 32.03 | 27.96 | c | 41.20 | a | ||||||
1952 | 25.00 | c | 29.59 | g | 29.87 | 39.72 | a | 45.86 | b | 44.44 | c | 55.71 | 54.80 | a | 51.46 | b | 44.68 | 30.90 | a | 28.79 | c | 41.02 | a | |||
1953 | 32.94 | 27.12 | b | 31.26 | d | 36.36 | e | 37.32 | 43.50 | d | 59.52 | 52.55 | 50.88 | d | 40.19 | 36.46 | f | 27.65 | 39.93 | a | ||||||
1954 | 27.72 | b | 33.46 | b | 31.32 | c | 39.52 | a | 43.90 | a | 47.43 | b | 58.97 | a | 50.24 | b | 46.32 | e | 39.17 | a | 34.88 | e | 26.91 | i | 41.18 | a |
1955 | 21.54 | c | 23.62 | g | 29.07 | d | 30.30 | c | 41.03 | 45.80 | 53.55 | 60.52 | 50.67 | 42.29 | 32.83 | a | 32.48 | b | 40.01 | a | ||||||
1956 | 33.07 | c | 26.19 | c | 30.27 | a | 36.36 | h | 40.54 | g | 48.78 | c | 54.30 | a | 48.63 | a | 52.48 | c | 39.42 | 31.53 | 29.65 | 39.43 | b | |||
1957 | 25.37 | a | 35.39 | 34.13 | a | 33.44 | c | 40.03 | a | 52.59 | a | 54.06 | 55.26 | 50.38 | d | 40.52 | 31.33 | 29.90 | 40.20 | |||||||
1958 | 29.30 | h | 34.61 | 30.50 | a | 35.17 | 45.30 | h | 46.56 | c | 51.66 | b | 57.90 | 50.10 | 42.32 | ----- | z | 31.06 | 42.21 | c | ||||||
1959 | 30.06 | 29.43 | 33.42 | 41.17 | 41.00 | 51.43 | 60.39 | 54.13 | 46.93 | 43.13 | a | 35.20 | 31.58 | 41.49 | ||||||||||||
1960 | 25.13 | 29.97 | 35.95 | j | 37.13 | 41.77 | 54.03 | 59.77 | 56.10 | 53.77 | 41.61 | 31.87 | 27.90 | b | 41.73 | a | ||||||||||
1961 | 28.61 | 31.57 | 33.58 | e | 38.67 | 42.81 | 55.57 | 61.03 | 58.10 | a | 48.90 | 40.93 | a | 32.03 | 27.61 | 41.62 | ||||||||||
1962 | 27.63 | a | 31.84 | c | 29.03 | 36.30 | 37.71 | 45.93 | 52.42 | 53.65 | 47.63 | 39.81 | 31.43 | 27.52 | h | 39.40 | a | |||||||||
1963 | 24.31 | o | 34.82 | 30.39 | 32.43 | 40.55 | 46.10 | 48.93 | a | 51.55 | 49.96 | f | 40.44 | d | 29.30 | c | 23.31 | b | 37.78 | b | ||||||
1964 | 21.42 | 24.31 | 25.23 | a | 31.77 | 35.81 | 43.27 | 57.55 | 55.52 | 45.00 | 43.84 | 26.14 | a | 28.93 | a | 36.56 | ||||||||||
1965 | 27.60 | a | 27.29 | 29.71 | 34.13 | ----- | z | 42.62 | a | 49.65 | 53.34 | b | 40.93 | 40.77 | 32.97 | a | 24.32 | i | 37.90 | b | ||||||
1966 | 22.38 | b | 21.33 | d | 28.38 | g | 34.88 | e | 39.87 | a | 46.91 | g | 51.67 | g | 55.12 | g | 46.54 | b | 38.37 | d | 32.61 | b | 24.94 | 32.61 | d | |
1967 | 25.81 | d | 25.84 | c | 29.28 | f | 25.65 | g | 39.64 | i | 41.50 | j | 57.03 | a | 57.57 | c | 50.19 | d | 42.10 | b | 39.96 | b | 23.78 | d | 40.29 | d |
1968 | 27.75 | g | 36.52 | h | 33.33 | g | 36.24 | e | ----- | z | 48.08 | d | 57.43 | j | 54.33 | a | ----- | z | 43.35 | 33.72 | a | ----- | z | 43.15 | g | |
1969 | 37.06 | o | 31.08 | o | ----- | z | ----- | z | ----- | z | ----- | z | 58.19 | d | 58.45 | 54.52 | a | 37.45 | 34.00 | e | 27.28 | m | 48.52 | g | ||
1970 | 27.00 | f | ----- | z | 32.13 | h | ----- | z | 43.11 | c | 49.68 | b | 59.72 | b | 60.57 | a | 48.86 | a | 41.52 | 35.78 | c | 27.18 | n | 48.46 | e | |
1971 | 28.94 | o | 27.23 | o | 31.11 | m | 34.57 | g | 36.45 | t | 48.19 | d | 55.84 | 59.84 | 50.67 | 39.27 | a | 32.76 | a | 23.27 | p | 47.76 | f | |||
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.40 | 25.56 | d | 28.48 | j | |
1973 | 25.35 | 32.33 | a | 31.17 | a | 36.83 | 44.90 | a | 49.23 | d | 53.59 | i | 54.52 | d | 44.57 | b | 38.48 | b | 32.03 | 27.44 | f | 38.94 | b | |||
1974 | 27.52 | d | 26.74 | a | 35.85 | e | 34.10 | 44.52 | 51.13 | 57.23 | 54.37 | a | 55.10 | 43.97 | b | 32.86 | a | 28.57 | a | 41.00 | ||||||
1975 | 27.87 | a | 29.57 | 31.85 | e | 31.74 | c | 42.47 | a | 50.96 | c | 54.53 | a | 51.71 | 53.33 | c | 40.93 | a | 31.10 | a | 28.76 | b | 39.57 | |||
1976 | 26.87 | a | 30.80 | d | 30.97 | a | 33.31 | a | 45.60 | a | 49.34 | a | 56.17 | a | 48.10 | a | 52.44 | c | 42.32 | 36.89 | b | 26.93 | a | 39.98 | ||
1977 | 29.42 | 33.07 | 27.67 | a | 37.76 | a | 39.83 | a | 51.45 | a | 53.66 | b | 57.43 | a | 48.40 | 43.40 | a | 34.48 | a | 34.74 | 40.94 | |||||
1978 | 33.29 | 34.00 | a | 39.42 | 36.23 | 43.43 | a | 49.86 | b | 53.11 | c | 54.39 | 50.67 | c | ----- | z | 32.20 | 26.00 | b | 41.14 | a | |||||
1979 | 27.04 | c | 26.68 | 32.96 | c | 35.28 | a | 45.46 | c | 49.52 | c | 51.96 | d | 51.03 | b | 52.70 | c | 42.14 | c | 30.07 | a | 29.74 | d | 39.55 | ||
1980 | 33.96 | c | 34.82 | a | 32.65 | 37.83 | a | 40.61 | h | ----- | z | 55.95 | l | 54.27 | e | 49.64 | b | 43.96 | d | 34.25 | b | 32.19 | d | 39.29 | c | |
1981 | 31.86 | b | 31.26 | a | 32.65 | 38.70 | c | 44.33 | g | 53.41 | h | 53.28 | m | 56.18 | i | 51.48 | c | 38.04 | h | 34.57 | b | 30.88 | f | 36.75 | f | |
1982 | 26.63 | a | 32.42 | b | 31.04 | c | 35.25 | f | 43.72 | f | 46.35 | g | 53.00 | h | 53.38 | o | 51.91 | h | 37.05 | j | 31.45 | h | 29.93 | c | 30.01 | h |
1983 | 29.57 | c | 33.16 | c | 34.21 | b | 33.42 | d | 39.25 | g | 45.35 | j | 48.42 | g | 55.14 | c | 53.08 | e | 43.72 | b | 33.93 | a | 30.36 | c | 38.51 | c |
1984 | 28.75 | c | 28.04 | b | 33.42 | 33.89 | b | 44.86 | c | 48.37 | c | 59.52 | h | 56.79 | c | 56.74 | c | 36.36 | c | 32.19 | i | 23.33 | g | 40.80 | c | |
1985 | 26.29 | 30.11 | 28.12 | n | 46.29 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.20 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.86 | 30.07 | 32.10 | 36.32 | 41.72 | 47.63 | 54.56 | 53.70 | 49.04 | 40.56 | 32.40 | 28.97 | 39.34 | |||||||||||||
S.D. | 3.03 | 3.53 | 2.75 | 2.56 | 2.45 | 3.19 | 3.58 | 3.31 | 3.76 | 2.28 | 2.72 | 2.83 | 1.39 | |||||||||||||
SKEW | 0.04 | -0.45 | 0.18 | -0.34 | -0.30 | 0.32 | -0.09 | 0.19 | -0.57 | -0.17 | 0.11 | 0.50 | -0.10 | |||||||||||||
MAX | 33.96 | 35.39 | 39.42 | 41.17 | 45.86 | 55.57 | 61.03 | 60.57 | 56.74 | 44.68 | 39.96 | 37.39 | 41.62 | |||||||||||||
MIN | 21.42 | 21.33 | 25.23 | 30.30 | 35.81 | 42.50 | 46.83 | 47.87 | 38.93 | 36.06 | 25.47 | 23.31 | 36.56 | |||||||||||||
YRS | 40 | 41 | 40 | 41 | 36 | 40 | 40 | 44 | 45 | 44 | 44 | 38 | 18 |