| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 89.50 | o | 71.53 | 62.81 | 41.33 | 34.87 | 52.64 | |||||
| 1932 | 30.13 | 34.50 | a | 43.03 | 57.97 | 65.55 | 74.73 | 86.35 | 83.97 | 79.50 | 62.32 | 54.13 | 29.30 | h | 61.11 | |||||||||||
| 1933 | 33.06 | 30.50 | 44.74 | 55.23 | 60.87 | 82.04 | f | 90.94 | 85.39 | 80.55 | j | ----- | z | ----- | z | 47.30 | a | 56.00 | ||||||||
| 1934 | 43.35 | 49.30 | a | 60.42 | 67.10 | 75.03 | 76.33 | 91.16 | ----- | z | 75.06 | n | 69.23 | 54.40 | 35.65 | 62.20 | ||||||||||
| 1935 | 39.31 | b | 35.07 | 40.45 | 57.65 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.33 | a | 40.67 | 39.68 | 43.09 | |||||
| 1936 | 34.58 | 35.26 | b | 47.17 | b | 58.06 | m | 65.33 | z | ----- | z | ----- | z | ----- | z | 71.12 | m | ----- | z | 52.60 | 40.48 | 42.02 | ||||
| 1937 | 19.97 | a | 37.26 | a | 53.97 | ----- | z | ----- | z | 74.57 | 87.65 | 86.28 | m | 81.87 | 64.10 | 59.03 | 42.37 | a | 57.86 | |||||||
| 1938 | 41.21 | q | ----- | z | ----- | z | 53.57 | w | ----- | z | ----- | z | 90.87 | p | 89.88 | n | 87.90 | j | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1952 | ----- | z | ----- | z | 38.63 | a | 60.93 | 66.58 | 72.53 | 85.81 | 86.39 | 80.23 | 72.48 | 44.90 | 39.46 | g | 67.61 | |||||||||
| 1953 | 46.72 | b | 43.07 | a | 51.57 | a | 56.03 | 61.29 | n | 68.93 | b | 89.14 | b | 82.46 | e | 80.59 | c | 65.39 | h | 55.36 | e | 38.55 | b | 61.24 | ||
| 1954 | 39.26 | 48.17 | d | 45.04 | c | 59.90 | a | 72.86 | c | 71.86 | b | 89.21 | b | 81.04 | e | 76.15 | c | 63.44 | d | 55.69 | a | 36.52 | 61.59 | |||
| 1955 | 30.65 | 34.48 | a | 40.43 | a | 49.07 | 63.21 | c | 77.17 | 83.78 | d | 89.79 | b | 76.54 | b | 65.95 | i | 43.33 | 39.26 | d | 57.06 | |||||
| 1956 | 37.63 | d | 34.07 | a | 47.21 | c | 58.89 | c | 68.76 | b | 75.93 | b | 88.08 | e | 82.04 | e | 79.54 | b | 58.74 | d | 45.08 | d | 40.86 | b | 59.74 | |
| 1957 | 29.71 | 40.68 | 48.87 | 55.18 | b | 63.89 | c | 77.38 | f | 87.65 | e | 85.92 | g | 80.28 | e | 57.25 | c | 45.26 | c | 41.24 | b | 55.00 | ||||
| 1958 | 37.54 | e | 46.24 | c | 45.28 | b | 54.61 | b | 73.30 | a | 73.54 | d | 84.96 | h | 89.52 | d | 74.07 | c | 69.11 | c | 48.93 | c | 48.18 | c | 60.03 | |
| 1959 | 41.14 | b | 39.43 | 49.68 | 61.00 | b | 60.71 | c | 81.19 | d | 90.33 | a | 84.44 | d | 69.72 | e | 62.57 | c | 53.56 | c | 41.66 | b | 61.29 | |||
| 1960 | 33.45 | b | 36.33 | b | 51.08 | e | 59.27 | d | 65.29 | g | 82.71 | f | 92.92 | e | 82.04 | d | 80.26 | c | 63.38 | e | 46.86 | a | 40.29 | c | 58.59 | |
| 1961 | 43.00 | 44.50 | d | 48.43 | c | 57.56 | e | 71.00 | g | 85.72 | a | 90.24 | b | 90.41 | b | 71.32 | b | 60.41 | d | 46.78 | g | 35.68 | f | 65.73 | ||
| 1962 | 33.00 | b | 39.26 | a | 44.52 | b | 63.37 | c | 63.04 | g | 77.36 | b | 85.00 | c | 83.28 | f | 78.68 | h | 62.71 | c | 49.12 | d | 43.26 | d | 55.29 | |
| 1963 | 36.07 | c | 49.58 | d | 50.24 | f | 48.44 | l | 67.04 | g | 69.32 | e | 84.00 | 86.34 | b | 80.63 | c | 66.50 | c | 47.70 | 38.07 | a | 62.02 | |||
| 1964 | 34.80 | a | 36.43 | a | 41.04 | c | 54.83 | 64.26 | 69.53 | 87.35 | 83.41 | b | 72.93 | c | 67.35 | 44.24 | a | 38.65 | 57.90 | |||||||
| 1965 | 35.55 | 44.14 | 49.06 | ----- | z | 62.60 | a | 72.70 | 84.27 | a | 81.13 | a | 67.50 | 70.45 | 51.13 | 40.93 | a | 59.95 | ||||||||
| 1966 | 38.13 | a | 38.96 | b | 51.03 | a | 61.13 | 74.10 | b | 76.07 | a | 88.25 | c | 86.59 | b | 77.85 | c | 64.38 | b | 50.10 | a | 39.80 | a | 62.20 | ||
| 1967 | 40.08 | e | 45.26 | a | 48.80 | a | 48.07 | c | 67.73 | a | 72.76 | a | 90.31 | b | 92.61 | c | 80.38 | d | 64.59 | b | 49.23 | 35.03 | 61.24 | |||
| 1968 | 37.12 | g | 49.14 | a | 54.90 | 55.80 | 66.82 | c | 77.63 | c | 90.45 | b | 76.94 | 74.57 | b | 63.57 | c | 44.88 | e | 35.77 | a | 62.77 | ||||
| 1969 | 38.17 | b | 39.00 | 47.79 | b | 59.69 | a | 71.72 | b | 73.28 | a | 87.20 | a | 89.47 | a | 78.55 | a | 55.77 | 51.55 | a | 41.37 | a | 61.13 | |||
| 1970 | 38.77 | a | 48.29 | 46.71 | 49.21 | a | 66.94 | 75.93 | 88.19 | 90.28 | b | 70.96 | b | 58.00 | 47.33 | 34.58 | 59.60 | |||||||||
| 1971 | 38.97 | 43.82 | 44.57 | a | 56.77 | 66.42 | 72.10 | 85.42 | 89.85 | e | 69.40 | e | 57.93 | a | 44.75 | b | 33.23 | 58.60 | ||||||||
| 1972 | 34.19 | 42.76 | 53.53 | a | 55.07 | 69.37 | a | 77.00 | 85.61 | 86.77 | 70.87 | 60.79 | c | 43.46 | b | 33.00 | 59.37 | |||||||||
| 1973 | 35.17 | a | 44.29 | 47.07 | a | 55.34 | a | 71.13 | 79.27 | 88.40 | a | 85.00 | b | 74.97 | a | 63.10 | 43.57 | 41.03 | 60.69 | |||||||
| 1974 | 33.84 | 41.96 | 47.90 | 56.13 | 62.56 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.40 | ----- | z | 45.65 | ||||||
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | 61.08 | g | 72.15 | d | 86.06 | 79.22 | h | 74.10 | a | 56.61 | 42.03 | 38.32 | 61.55 | |||||
| 1976 | ----- | z | ----- | z | 38.39 | 55.27 | 72.10 | a | 73.93 | a | 87.12 | e | 77.03 | a | 76.68 | b | 65.84 | 51.29 | i | 45.00 | 65.71 | |||||
| 1977 | 33.07 | a | 47.15 | a | 44.72 | b | 63.76 | a | 58.78 | d | 82.57 | b | 87.41 | d | 86.13 | a | 72.11 | c | 62.27 | e | 47.89 | c | 41.80 | a | 60.64 | |
| 1978 | 39.07 | a | 40.76 | c | 55.83 | b | 55.03 | a | 62.56 | f | 75.00 | r | 87.40 | f | 82.36 | c | 73.24 | a | 70.07 | b | 45.48 | a | 33.07 | a | 54.99 | |
| 1979 | 27.00 | 39.41 | a | 50.23 | a | 55.54 | b | 67.21 | g | 79.00 | g | 89.29 | 83.48 | 84.28 | e | 67.17 | b | 44.47 | 44.33 | d | 58.52 | |||||
| 1980 | 36.73 | e | 45.89 | b | ----- | z | 62.37 | c | 61.78 | d | 73.38 | d | 86.13 | a | 82.60 | a | 79.97 | 70.28 | b | 52.90 | a | 46.23 | a | 63.48 | ||
| 1981 | 38.17 | a | 43.39 | 51.13 | a | 60.50 | b | 62.29 | c | 75.33 | 88.28 | b | 91.48 | 79.08 | d | 60.48 | 53.38 | d | 41.76 | j | 63.96 | |||||
| 1982 | 34.29 | 39.25 | 46.23 | 52.20 | 61.12 | w | 76.60 | 81.42 | 87.81 | 78.17 | l | 59.35 | 40.87 | 35.55 | 55.36 | |||||||||||
| 1983 | 42.62 | e | 44.50 | 47.48 | 51.13 | 65.03 | 73.83 | 84.06 | 84.00 | 74.37 | 65.58 | 46.70 | 31.68 | 59.25 | ||||||||||||
| 1984 | 29.55 | 38.59 | 47.32 | 53.27 | 65.87 | 70.74 | c | 88.81 | 88.29 | 70.44 | l | 47.38 | j | ----- | z | 34.29 | 57.41 | |||||||||
| 1985 | 33.45 | 35.75 | 44.38 | b | 51.54 | q | 67.06 | 81.10 | 91.42 | 83.20 | f | 66.46 | d | 59.87 | 40.41 | a | 33.35 | 55.33 | ||||||||
| 1986 | 43.65 | 45.50 | 56.19 | 57.80 | 67.42 | 83.33 | 82.71 | j | 90.87 | a | 69.34 | a | 65.52 | j | ----- | z | ----- | z | 64.26 | |||||||
| 1987 | 35.10 | 44.22 | a | 49.41 | b | 71.11 | k | 72.17 | a | 80.50 | v | 84.65 | ----- | z | ----- | z | 72.29 | 48.96 | c | 36.40 | k | 58.11 | ||||
| 1988 | 34.52 | 46.62 | 50.86 | b | 61.90 | 67.45 | 82.30 | 93.85 | k | 88.65 | 76.57 | 74.52 | 43.33 | 35.45 | 60.20 | |||||||||||
| 1989 | 33.94 | 33.29 | 49.61 | 61.87 | 66.68 | 80.30 | 90.58 | 81.77 | 77.00 | j | 62.94 | 49.37 | k | 42.11 | l | 62.33 | ||||||||||
| 1990 | 40.90 | 39.68 | 53.55 | 65.23 | 63.87 | 79.33 | i | ----- | z | 85.32 | 83.33 | 63.95 | i | 50.27 | 31.13 | 57.03 | ||||||||||
| 1991 | 37.23 | 50.96 | 47.52 | 52.90 | 59.84 | 71.37 | 88.68 | ----- | z | 80.07 | 64.52 | 45.40 | 41.39 | 58.17 | ||||||||||||
| 1992 | 40.58 | 49.69 | 58.06 | 64.20 | 78.65 | 80.53 | 83.29 | 89.03 | ----- | z | 66.97 | 39.73 | 34.32 | 62.28 | ||||||||||||
| 1993 | 31.61 | 35.63 | a | 49.65 | 54.10 | 70.84 | 71.07 | 76.61 | 81.35 | 78.33 | i | 64.16 | 45.37 | 39.90 | 56.39 | |||||||||||
| 1994 | 43.13 | 40.86 | 57.58 | 61.60 | 70.26 | 81.33 | 91.97 | 90.65 | 82.10 | i | 62.00 | 38.50 | 35.74 | 61.24 | ||||||||||||
| 1995 | 40.58 | 54.20 | m | 48.77 | 54.53 | 63.68 | 72.50 | 85.13 | 86.68 | 81.00 | i | 64.67 | j | 56.53 | 38.35 | 60.75 | ||||||||||
| 1996 | 38.10 | 42.07 | 51.52 | 59.23 | 63.74 | 79.23 | 90.42 | 88.68 | 73.27 | 60.84 | 50.56 | l | 40.29 | 62.49 | ||||||||||||
| 1997 | 38.68 | 42.89 | 55.10 | 55.30 | 72.03 | 75.33 | 85.81 | 87.39 | 79.33 | 62.55 | 51.87 | 38.68 | 62.08 | |||||||||||||
| 1998 | 42.77 | 42.11 | 50.29 | 55.00 | 60.19 | ----- | z | 88.19 | 90.10 | 79.53 | 63.24 | j | 48.13 | 39.60 | p | 61.81 | ||||||||||
| 1999 | 40.08 | r | 40.39 | 50.84 | 54.67 | 64.81 | 76.93 | 88.06 | 87.52 | 77.57 | 69.43 | c | 57.07 | 40.45 | i | 66.73 | ||||||||||
| 2000 | 39.32 | 46.69 | 50.84 | 65.40 | 67.97 | 82.40 | 89.81 | 90.13 | 75.97 | 60.29 | 38.07 | 38.91 | i | 64.26 | ||||||||||||
| 2001 | ----- | z | 41.14 | 52.71 | 57.87 | 76.41 | i | 77.90 | j | 88.10 | 93.48 | 82.23 | 68.45 | 54.27 | 35.95 | i | 67.28 | |||||||||
| 2002 | 36.32 | 43.43 | 46.55 | 58.67 | 68.28 | f | 81.35 | d | 93.78 | d | 84.73 | e | 77.97 | 61.68 | i | 49.90 | 43.06 | m | 63.63 | |||||||
| 2003 | 45.52 | 42.30 | e | 51.87 | 53.71 | f | 68.97 | 80.83 | 95.26 | 90.50 | i | 83.74 | k | 74.55 | k | ----- | z | ----- | z | 64.13 | ||||||
| 2004 | ----- | z | 41.50 | o | 54.00 | n | 63.27 | 68.33 | m | 78.76 | m | 90.28 | f | 84.87 | h | 75.93 | p | ----- | z | ----- | z | ----- | z | 63.27 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 36.77 | 41.74 | 48.90 | 57.62 | 67.05 | 76.17 | 87.76 | 86.20 | 76.27 | 64.06 | 47.81 | 38.68 | 60.38 | |||||||||||||
| S.D. | 4.93 | 4.86 | 4.75 | 4.39 | 4.55 | 4.24 | 3.25 | 3.89 | 4.45 | 4.43 | 5.19 | 4.15 | 1.32 | |||||||||||||
| SKEW | -0.63 | -0.14 | -0.02 | 0.04 | 0.31 | 0.28 | -0.55 | -0.36 | -0.36 | 0.33 | 0.15 | 0.24 | -0.29 | |||||||||||||
| MAX | 46.72 | 50.96 | 60.42 | 67.10 | 78.65 | 85.72 | 95.26 | 93.48 | 84.28 | 74.52 | 59.03 | 48.18 | 62.20 | |||||||||||||
| MIN | 19.97 | 30.50 | 38.39 | 48.07 | 58.78 | 68.93 | 76.61 | 76.94 | 66.46 | 55.77 | 38.07 | 31.13 | 57.90 | |||||||||||||
| NO YRS | 52 | 54 | 55 | 50 | 43 | 46 | 50 | 46 | 44 | 47 | 51 | 45 | 14 | |||||||||||||