| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1920 | ----- | z | ----- | z | 33.19 | g | 37.85 | ----- | z | 54.35 | 61.23 | ----- | z | 52.83 | 39.97 | 35.88 | 27.27 | 44.20 | ||||||||
| 1921 | 25.68 | 30.29 | 37.27 | 38.35 | 44.81 | 54.62 | 60.66 | 59.52 | 49.95 | 47.47 | 36.65 | 29.45 | 42.89 | |||||||||||||
| 1922 | 19.08 | 23.80 | 29.02 | 32.53 | 42.70 | a | 57.82 | 65.81 | 59.06 | 56.57 | 46.50 | 35.23 | 29.76 | 41.49 | ||||||||||||
| 1923 | 28.65 | 28.82 | 35.71 | 41.83 | 48.29 | 52.33 | 62.55 | 62.79 | 56.70 | 44.08 | 38.10 | 27.68 | 43.96 | |||||||||||||
| 1924 | 26.79 | 38.21 | 32.82 | 43.00 | 53.66 | 55.40 | 63.15 | 62.27 | 53.25 | d | 44.04 | d | 36.85 | 23.87 | 44.44 | |||||||||||
| 1925 | 32.11 | 35.55 | 38.89 | 42.73 | 51.58 | ----- | z | 66.14 | f | 55.46 | s | 49.58 | 44.27 | 39.69 | n | 34.34 | 41.13 | |||||||||
| 1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.25 | l | 28.19 | 28.19 | ||
| 1927 | 31.21 | 30.89 | 36.10 | 37.30 | 43.37 | 51.92 | 60.71 | 59.15 | 48.27 | 42.05 | 37.80 | 25.68 | 42.04 | |||||||||||||
| 1928 | 32.21 | 33.31 | 39.34 | 38.03 | 51.47 | 52.08 | 63.37 | 59.68 | 53.43 | 42.65 | 35.47 | 24.29 | 43.78 | |||||||||||||
| 1929 | 18.42 | 19.96 | 31.10 | 31.85 | 40.94 | 49.73 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.75 | y | 32.00 | |||||||
| 1930 | 22.56 | f | 36.50 | 37.44 | 43.90 | 45.92 | 52.30 | 63.11 | 60.71 | 53.35 | 42.69 | 35.13 | 29.02 | 45.46 | ||||||||||||
| 1931 | 31.37 | 34.04 | 37.71 | 41.83 | 53.26 | 54.88 | 67.24 | 64.42 | 52.73 | 46.05 | 31.35 | 27.98 | 45.24 | |||||||||||||
| 1932 | 23.40 | 26.91 | 37.42 | 39.77 | 47.77 | 56.45 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.62 | |||||||
| 1933 | 21.84 | 21.12 | 32.26 | 39.48 | 40.34 | 54.00 | 64.05 | 62.71 | 51.88 | 50.42 | 39.65 | 34.82 | 42.71 | |||||||||||||
| 1934 | 35.61 | 37.38 | 44.89 | 48.47 | 51.69 | 54.52 | 62.35 | 64.35 | 55.65 | 47.32 | 38.85 | 30.19 | 47.61 | |||||||||||||
| 1935 | 29.15 | 32.88 | 30.65 | 40.25 | 45.74 | 53.20 | 59.48 | 62.52 | 57.90 | 43.08 | 33.17 | 31.21 | 43.27 | |||||||||||||
| 1936 | 28.76 | 30.12 | 34.34 | 42.20 | ----- | z | ----- | z | ----- | z | 61.66 | 50.12 | 43.60 | 32.27 | 26.19 | 38.81 | ||||||||||
| 1937 | 11.05 | 26.59 | 34.21 | 37.45 | 47.98 | 52.13 | 59.56 | 58.15 | 55.02 | 44.85 | 36.03 | 32.66 | 41.31 | |||||||||||||
| 1938 | 30.69 | 28.43 | 30.24 | 39.53 | m | 47.85 | 56.48 | 64.02 | 60.44 | 57.37 | 45.94 | 34.28 | 33.05 | 44.44 | ||||||||||||
| 1939 | 28.66 | 25.48 | 37.50 | 45.48 | 48.73 | 51.97 | 63.08 | 64.31 | 54.40 | 45.85 | 38.68 | 34.31 | 44.87 | |||||||||||||
| 1940 | 28.31 | 27.78 | 32.02 | 35.70 | 42.55 | 53.95 | 58.15 | 63.18 | 52.68 | 46.68 | 33.12 | 32.69 | 42.23 | |||||||||||||
| 1941 | 29.34 | 34.43 | 37.69 | 39.67 | 47.24 | 50.55 | 61.74 | 58.45 | 48.27 | 43.89 | 41.38 | 33.32 | i | 44.79 | ||||||||||||
| 1942 | 26.10 | a | 28.39 | 35.24 | 41.62 | 44.44 | 52.33 | 63.47 | a | 63.08 | 55.62 | 48.87 | 36.83 | 32.92 | 44.08 | |||||||||||
| 1943 | 28.06 | 32.36 | 35.27 | 43.47 | 44.35 | 48.30 | 60.23 | 56.98 | 57.97 | 42.97 | 37.12 | 29.13 | 43.02 | |||||||||||||
| 1944 | 25.74 | 26.67 | 31.82 | 36.85 | 45.16 | 48.33 | 57.76 | 56.21 | 52.48 | 47.23 | 28.55 | 26.97 | 40.31 | |||||||||||||
| 1945 | 31.03 | 32.54 | 32.71 | 39.70 | 47.94 | 53.37 | 63.82 | 62.37 | 53.20 | 49.37 | 34.77 | 29.63 | 44.20 | |||||||||||||
| 1946 | 27.35 | 32.61 | j | 35.26 | 44.18 | 48.77 | 54.92 | 61.87 | 62.59 | t | ----- | z | ----- | z | ----- | z | ----- | z | 45.39 | |||||||
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | 55.67 | b | 53.12 | 60.95 | 59.65 | 56.60 | 49.71 | 36.58 | 33.58 | 50.73 | ||||||||
| 1948 | 34.82 | 29.47 | 33.79 | 37.68 | 45.98 | 56.55 | 59.69 | 59.32 | 53.22 | 46.00 | 34.08 | 23.61 | 42.85 | |||||||||||||
| 1949 | 14.27 | 27.45 | 35.50 | 45.95 | 52.10 | 54.75 | 62.18 | a | 60.02 | a | 62.50 | z | 42.75 | q | 44.17 | 26.00 | 42.24 | |||||||||
| 1950 | 18.90 | 30.95 | 31.94 | 39.97 | 45.82 | 51.04 | e | ----- | z | 67.48 | 51.70 | 46.95 | 39.87 | 38.03 | 42.06 | |||||||||||
| 1951 | 27.90 | 35.92 | h | 31.93 | b | 44.12 | 47.81 | 56.77 | 62.08 | 60.10 | 56.08 | 42.16 | 35.88 | a | 23.35 | 44.38 | ||||||||||
| 1952 | 25.26 | 28.33 | 28.37 | 43.72 | 48.29 | 51.62 | 63.29 | 60.15 | 57.73 | 51.61 | 31.88 | 28.69 | 43.24 | |||||||||||||
| 1953 | 35.16 | 32.38 | 34.85 | 38.80 | 42.84 | 49.03 | 62.35 | 59.19 | 58.73 | 46.03 | 40.22 | 33.08 | 44.39 | |||||||||||||
| 1954 | 29.29 | 35.00 | 32.95 | 43.18 | 50.87 | 51.68 | 61.05 | 56.40 | 50.78 | 44.58 | 40.28 | 29.03 | 43.76 | |||||||||||||
| 1955 | 23.31 | 26.14 | 32.18 | 34.87 | 45.50 | 55.03 | 58.08 | 63.84 | 54.29 | a | 47.53 | 33.36 | a | 29.23 | 41.95 | |||||||||||
| 1956 | 30.21 | 26.26 | 33.18 | 42.37 | 49.95 | 52.63 | 62.27 | 58.24 | 54.83 | 43.58 | 37.52 | 32.53 | 43.63 | |||||||||||||
| 1957 | 22.02 | 34.00 | 36.71 | 41.75 | 47.82 | 56.00 | 59.50 | 57.34 | 57.47 | 42.31 | 33.28 | 32.90 | e | 43.42 | ||||||||||||
| 1958 | 31.35 | 37.55 | 31.76 | 39.33 | 52.74 | 54.62 | 62.34 | 64.27 | 53.47 | 49.37 | 38.62 | 37.58 | 46.08 | |||||||||||||
| 1959 | 33.23 | 30.57 | 36.27 | 43.78 | 43.29 | 56.27 | 65.63 | 60.72 | a | 51.48 | 46.02 | h | 38.20 | 29.39 | 44.44 | |||||||||||
| 1960 | 27.44 | 29.71 | 38.85 | 40.60 | 45.15 | 56.73 | f | 65.68 | 59.15 | 56.55 | 46.11 | 34.29 | a | 31.65 | 43.20 | |||||||||||
| 1961 | 34.61 | 34.50 | 35.00 | 41.07 | 45.02 | 59.97 | 63.61 | 64.79 | 50.48 | 45.15 | 35.52 | e | 29.15 | a | 44.91 | |||||||||||
| 1962 | 25.60 | 30.62 | 33.63 | 44.78 | 43.71 | 53.63 | 60.05 | b | 59.27 | 57.53 | 46.71 | 38.87 | 35.89 | 44.19 | ||||||||||||
| 1963 | 27.58 | 40.16 | 34.26 | 35.85 | 50.16 | 52.30 | 57.13 | 58.79 | 59.35 | 47.24 | 37.35 | 33.71 | 44.49 | |||||||||||||
| 1964 | 28.03 | a | 27.02 | 30.65 | 38.13 | 44.47 | 52.45 | 62.15 | 59.23 | 51.90 | 49.55 | 33.55 | 30.63 | 42.31 | ||||||||||||
| 1965 | 30.81 | 34.18 | 36.15 | 42.30 | 45.42 | 54.15 | 60.76 | 59.19 | 50.62 | 50.11 | 37.22 | 27.82 | 44.06 | |||||||||||||
| 1966 | 27.81 | 29.05 | 35.15 | a | 43.05 | 50.87 | 52.73 | 59.00 | e | 61.90 | 56.38 | 46.53 | 36.78 | 31.35 | 44.22 | |||||||||||
| 1967 | 31.21 | 34.84 | 32.87 | 32.92 | 48.11 | 54.03 | 64.06 | 65.77 | 58.70 | 46.61 | 38.03 | 22.65 | 44.15 | |||||||||||||
| 1968 | 27.68 | 37.31 | 38.58 | 38.63 | 47.76 | 54.90 | 65.85 | 58.24 | 54.00 | 45.52 | 35.88 | 27.03 | 44.28 | |||||||||||||
| 1969 | 26.53 | 28.66 | 32.53 | 40.92 | 52.35 | 56.22 | 61.52 | 60.52 | 56.42 | 41.24 | 39.07 | a | 31.73 | 43.97 | ||||||||||||
| 1970 | 31.50 | 36.36 | 35.58 | 35.17 | 48.05 | 57.48 | 64.56 | 62.48 | 50.22 | 43.84 | 37.52 | 25.95 | 44.06 | |||||||||||||
| 1971 | 28.61 | 32.61 | 30.10 | 38.97 | 46.37 | 52.03 | 62.45 | 64.53 | 49.09 | b | 41.15 | 35.67 | 24.56 | 42.18 | ||||||||||||
| 1972 | 25.85 | 33.86 | 40.11 | 39.12 | b | 49.53 | 56.52 | 63.63 | 62.92 | 51.10 | 43.98 | 34.48 | 24.10 | 43.77 | ||||||||||||
| 1973 | 27.94 | 35.02 | 33.52 | 40.88 | 52.26 | 55.83 | 63.55 | 61.68 | 54.28 | 45.52 | 34.10 | 33.40 | a | 44.83 | ||||||||||||
| 1974 | 26.53 | 30.09 | 35.45 | 39.78 | a | 45.94 | 58.78 | 60.00 | 61.39 | 57.48 | 45.62 | a | 38.40 | 28.89 | 44.03 | |||||||||||
| 1975 | 27.92 | 29.68 | 31.73 | 34.08 | 47.12 | b | 52.67 | d | 62.79 | 58.05 | 58.09 | b | 43.97 | 29.32 | h | 34.04 | c | 43.65 | ||||||||
| 1976 | 31.39 | 31.95 | 32.32 | a | 39.25 | 49.24 | 52.15 | 62.81 | 56.56 | 57.20 | 46.95 | 41.55 | a | 32.18 | 44.46 | |||||||||||
| 1977 | 25.32 | 36.62 | 32.55 | a | 44.80 | 42.16 | 60.19 | a | 63.28 | a | 64.75 | a | 54.30 | 46.94 | 36.20 | 32.40 | 44.96 | |||||||||
| 1978 | 33.87 | 36.88 | 43.27 | 40.83 | 45.60 | 56.83 | 62.30 | a | 62.53 | a | 51.60 | 49.79 | 32.30 | 24.10 | 44.99 | |||||||||||
| 1979 | 25.19 | 31.86 | 38.76 | 40.78 | 50.19 | 55.45 | 63.50 | 60.80 | a | 58.85 | 49.84 | 33.17 | 34.16 | 45.21 | ||||||||||||
| 1980 | 30.87 | 38.17 | 34.47 | 43.88 | 47.68 | 51.20 | 63.53 | 59.60 | 55.92 | 48.24 | 38.68 | 35.63 | 45.66 | |||||||||||||
| 1981 | 35.31 | 33.12 | 37.48 | 43.65 | 47.40 | 55.45 | 61.63 | 65.18 | 56.25 | 44.29 | 38.50 | 34.19 | 46.04 | |||||||||||||
| 1982 | 25.19 | 29.65 | a | 34.15 | 36.45 | 47.44 | 55.13 | 59.73 | 62.26 | 51.42 | 44.12 | a | 32.25 | 27.89 | 42.14 | |||||||||||
| 1983 | 33.24 | 35.12 | 37.00 | 37.88 | 48.84 | 52.85 | 56.39 | c | 62.05 | 53.16 | b | 48.11 | 35.00 | 28.97 | a | 44.05 | ||||||||||
| 1984 | 31.21 | 33.28 | 38.60 | 38.68 | 48.68 | 51.58 | 66.19 | 63.10 | b | 50.93 | b | 40.98 | 34.28 | 27.26 | 43.73 | |||||||||||
| 1985 | 27.84 | 29.48 | 31.97 | a | 44.92 | 47.61 | 57.35 | 64.92 | r | ----- | z | 48.32 | b | 42.90 | 27.57 | 30.42 | 38.84 | |||||||||
| 1986 | 38.37 | 36.93 | 41.47 | 40.72 | 48.06 | 59.32 | b | ----- | z | ----- | z | 48.27 | b | 46.73 | a | 37.22 | 33.16 | 43.02 | ||||||||
| 1987 | 25.65 | 33.21 | 37.38 | a | 46.67 | a | 51.18 | 58.22 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.82 | ||||
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.85 | n | 9999.00 | |
| 1998 | 36.80 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.97 | ----- | z | 59.43 | ----- | z | 26.17 | 14.86 | x | 50.86 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 28.05 | 31.59 | 34.92 | 40.37 | 47.56 | 54.07 | 62.17 | 61.08 | 54.02 | 45.70 | 35.98 | 30.02 | 43.82 | |||||||||||||
| S.D. | 4.91 | 4.24 | 3.30 | 3.52 | 3.25 | 2.64 | 2.37 | 2.58 | 3.16 | 2.66 | 3.27 | 3.73 | 1.35 | |||||||||||||
| SKEW | -0.94 | -0.37 | 0.56 | -0.26 | 0.08 | 0.13 | -0.18 | 0.17 | -0.11 | 0.07 | -0.50 | -0.07 | -0.05 | |||||||||||||
| MAX | 38.37 | 40.16 | 44.89 | 48.47 | 55.67 | 60.19 | 67.24 | 67.48 | 59.43 | 51.61 | 44.17 | 38.03 | 47.61 | |||||||||||||
| MIN | 11.05 | 19.96 | 28.37 | 31.85 | 40.34 | 48.30 | 56.39 | 56.21 | 48.27 | 39.97 | 26.17 | 22.65 | 40.31 | |||||||||||||
| NO YRS | 64 | 63 | 65 | 65 | 65 | 63 | 60 | 59 | 63 | 61 | 62 | 63 | 48 | |||||||||||||