| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 93.90 | 89.74 | 85.37 | 69.23 | 51.27 | 41.84 | 71.89 | f | ||||||
| 1949 | 31.94 | 38.46 | 52.90 | 69.83 | 71.93 | b | 85.29 | m | 92.04 | h | 88.21 | c | 86.10 | 69.35 | 67.20 | 47.55 | b | 62.35 | b | |||||||
| 1950 | 41.77 | 55.25 | 64.77 | 73.80 | 80.61 | 90.20 | 92.90 | b | 90.52 | b | 78.24 | a | 75.04 | c | 59.96 | c | 57.73 | p | 73.01 | a | ||||||
| 1951 | 41.79 | g | ----- | z | 56.10 | 70.40 | e | 75.16 | 86.04 | c | 93.10 | b | 88.21 | c | 85.24 | a | 68.60 | a | 55.29 | b | 40.81 | 71.89 | b | |||
| 1952 | 37.52 | 46.59 | 58.00 | t | 65.03 | 78.45 | b | 80.82 | b | 90.37 | d | 91.06 | o | 84.62 | f | 77.33 | g | 61.88 | v | 48.00 | v | 66.46 | f | |||
| 1953 | 54.35 | 53.79 | 60.45 | 65.97 | 67.58 | 82.17 | 94.00 | 87.87 | 86.00 | b | 68.27 | a | 57.10 | a | 49.35 | 68.91 | ||||||||||
| 1954 | 48.81 | 60.37 | a | 56.81 | 74.20 | 83.39 | 82.45 | a | 91.94 | 86.26 | 84.45 | a | 72.26 | 61.53 | 47.43 | a | 70.82 | |||||||||
| 1955 | 37.74 | 47.68 | 58.27 | a | 62.83 | a | 73.10 | ----- | z | 89.35 | e | ----- | z | ----- | z | 72.61 | 57.87 | ----- | z | 62.43 | d | |||||
| 1956 | 49.26 | d | 49.03 | 62.10 | a | 64.27 | 74.32 | 87.30 | 89.03 | 84.43 | a | 86.77 | 68.65 | 59.73 | 53.09 | t | 70.44 | a | ||||||||
| 1957 | 39.23 | i | 55.29 | 57.89 | c | 65.05 | h | 69.39 | 88.20 | 91.29 | c | 89.13 | a | 84.89 | l | 62.71 | 51.40 | 54.30 | u | 70.66 | d | |||||
| 1958 | 48.94 | m | 52.56 | a | 50.97 | a | 64.38 | a | 80.12 | e | 84.52 | c | 91.27 | e | 92.00 | g | 84.71 | f | 77.46 | g | 58.41 | c | 57.80 | a | 67.50 | d |
| 1959 | 49.45 | 44.25 | 60.65 | e | 71.50 | h | 72.32 | 88.50 | 94.86 | b | 90.44 | f | 79.47 | 73.23 | 64.30 | 53.77 | 68.08 | b | ||||||||
| 1960 | 42.29 | 49.79 | 64.61 | 69.00 | 78.29 | 92.57 | 94.32 | 92.67 | a | 86.11 | b | 68.10 | 53.50 | 51.65 | 70.24 | |||||||||||
| 1961 | 51.71 | 54.80 | c | 59.07 | c | 68.09 | g | 74.65 | 91.14 | b | 94.15 | e | 87.06 | 79.10 | 68.40 | a | 53.00 | 49.17 | b | 69.30 | a | |||||
| 1962 | 48.74 | 51.29 | n | 54.87 | 75.60 | 70.54 | e | ----- | z | ----- | z | ----- | z | 83.60 | 71.87 | a | 62.77 | ----- | z | 66.85 | e | |||||
| 1963 | 43.38 | o | 58.68 | 55.90 | a | 59.75 | b | 75.79 | b | 78.31 | a | 90.46 | c | 88.22 | d | 81.88 | e | 70.86 | b | 55.07 | a | 53.61 | 69.87 | a | ||
| 1964 | 45.94 | 54.34 | 53.45 | 64.48 | e | 73.34 | b | 83.21 | a | 92.60 | k | 89.48 | h | 81.59 | a | 73.96 | d | 49.93 | 49.97 | 63.02 | b | |||||
| 1965 | 50.10 | 53.63 | a | 55.81 | 60.53 | 71.94 | ----- | z | 88.00 | a | 86.00 | 76.30 | 76.29 | 55.90 | 46.88 | e | 65.58 | a | ||||||||
| 1966 | 42.00 | ----- | z | 62.26 | 71.70 | 80.23 | 85.17 | a | 90.60 | a | 91.58 | 82.73 | 74.70 | k | 57.13 | 48.38 | b | 71.18 | b | |||||||
| 1967 | 46.45 | 52.57 | 58.35 | 52.77 | 73.52 | 80.93 | b | 91.77 | 92.19 | 79.72 | a | 73.65 | 58.47 | ----- | z | 69.13 | a | |||||||||
| 1968 | 48.87 | 55.79 | 58.71 | 64.17 | 76.59 | d | 87.97 | 90.86 | c | 85.00 | 82.60 | 70.84 | ----- | z | 42.52 | h | 72.14 | b | ||||||||
| 1969 | 45.26 | 39.96 | a | 50.55 | 66.30 | 79.27 | a | 80.64 | b | ----- | z | 93.76 | n | 84.64 | e | 66.86 | j | 59.07 | 51.52 | 61.91 | c | |||||
| 1970 | 47.23 | 54.43 | 57.16 | 60.97 | a | 77.84 | 86.71 | b | 92.00 | a | 92.35 | 82.00 | 69.37 | a | 57.53 | 39.68 | 68.11 | |||||||||
| 1971 | 50.52 | ----- | z | 60.58 | 66.23 | 69.10 | ----- | z | 93.25 | c | ----- | z | 81.13 | 66.90 | 54.62 | a | 41.35 | 64.85 | c | |||||||
| 1972 | 46.65 | 55.45 | 67.19 | 67.43 | b | 75.94 | 83.60 | 94.87 | 89.10 | 78.93 | a | 64.14 | j | 51.07 | a | 43.68 | f | 71.02 | b | |||||||
| 1973 | 38.74 | l | 43.92 | d | 50.87 | a | 63.21 | a | 78.89 | c | 83.64 | s | 93.78 | d | 89.03 | b | 82.00 | 69.73 | a | 52.64 | b | 51.04 | h | 69.34 | c | |
| 1974 | 40.23 | 54.18 | 57.97 | 65.03 | 79.90 | a | 89.00 | c | 92.20 | a | 88.94 | 90.00 | s | 69.32 | f | 55.60 | 46.61 | 66.97 | b | |||||||
| 1975 | 49.81 | 48.75 | 53.39 | 56.77 | 75.43 | a | 85.06 | m | 91.70 | a | 89.84 | 82.33 | 65.25 | c | 54.93 | 55.60 | p | 66.82 | b | |||||||
| 1976 | 54.14 | b | 50.30 | i | 56.90 | 60.04 | g | 77.42 | 83.14 | p | 88.90 | a | 82.23 | i | 77.48 | e | 69.00 | a | 63.14 | a | 52.44 | f | 69.57 | e | ||
| 1977 | 47.29 | c | 57.25 | 52.74 | 68.08 | d | 64.82 | c | 81.35 | j | 91.80 | p | 90.25 | o | 77.68 | h | 74.90 | u | 60.15 | q | 48.84 | f | 58.04 | g | ||
| 1978 | ----- | z | 49.96 | 59.23 | 60.83 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.07 | d | ----- | z | ----- | z | 61.27 | h | ||
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.70 | 50.68 | 52.69 | j | ||
| 1980 | 48.45 | 51.10 | 52.29 | 65.23 | 67.68 | 81.93 | 91.23 | 88.90 | 81.43 | 71.19 | 58.97 | 55.06 | 67.79 | |||||||||||||
| 1981 | 50.55 | 53.86 | 54.23 | 69.63 | 73.39 | 89.97 | 93.35 | 92.45 | 83.27 | 63.81 | 55.77 | 47.97 | 69.02 | |||||||||||||
| 1982 | 42.39 | 53.00 | a | 52.90 | 63.25 | b | 75.64 | c | 79.77 | d | 87.70 | a | 86.17 | g | 75.96 | d | ----- | z | ----- | z | ----- | z | 66.33 | d | ||
| 1983 | 42.89 | m | 49.39 | e | 52.38 | e | 56.62 | n | ----- | z | ----- | z | 87.65 | k | 83.00 | 80.53 | 69.34 | b | 53.72 | a | 47.74 | 62.30 | e | |||
| 1984 | 52.45 | 54.46 | a | 61.23 | 66.04 | d | 82.07 | a | 84.00 | 88.97 | 85.00 | l | 82.13 | 63.55 | 53.27 | 39.10 | a | 66.11 | a | |||||||
| 1985 | 45.13 | 51.82 | 55.58 | 72.43 | ----- | z | ----- | z | 93.15 | e | 90.16 | 75.76 | a | 69.67 | a | ----- | z | ----- | z | 69.21 | d | |||||
| 1986 | ----- | z | 54.96 | 63.18 | c | 65.41 | c | 79.59 | d | 92.46 | f | 91.73 | e | 91.48 | d | 73.54 | d | 67.30 | a | 57.28 | a | 50.73 | t | 71.61 | c | |
| 1987 | ----- | z | ----- | z | 58.10 | b | 73.83 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.44 | v | 51.50 | 43.13 | h | 61.14 | i | |
| 1988 | ----- | z | ----- | z | 55.50 | y | 65.18 | s | 64.19 | o | 82.05 | h | 92.29 | x | 88.64 | c | 79.67 | f | ----- | z | 54.92 | d | 44.61 | c | 62.72 | i |
| 1989 | 43.74 | 49.04 | a | 64.31 | e | 76.29 | f | 74.78 | h | 85.37 | c | 94.47 | a | 87.57 | a | 80.89 | b | 68.93 | d | 61.45 | a | 54.58 | g | 70.64 | c | |
| 1990 | 47.16 | 50.04 | 62.37 | a | 69.55 | a | 73.74 | d | 86.82 | b | 91.97 | a | 88.19 | 80.44 | c | 72.40 | a | 59.37 | c | 43.14 | b | 68.77 | ||||
| 1991 | 50.53 | a | 60.32 | f | 49.75 | c | 64.79 | a | 71.38 | e | 84.04 | b | 93.11 | l | 88.75 | c | 82.00 | i | 72.54 | c | 58.07 | 48.03 | 65.32 | c | ||
| 1992 | 39.50 | a | 50.44 | b | 55.69 | e | 71.22 | c | 79.23 | a | 83.70 | c | 87.43 | c | 89.66 | b | 83.03 | a | 72.54 | c | 54.07 | a | 41.19 | 67.31 | ||
| 1993 | 39.65 | 45.32 | 61.27 | a | 67.31 | d | 75.89 | c | ----- | z | 89.37 | a | 88.31 | e | 80.50 | h | 69.72 | f | 54.33 | 48.93 | p | 65.18 | d | |||
| 1994 | 54.11 | c | 46.89 | j | 63.00 | m | 66.54 | f | 73.35 | h | 86.28 | l | 95.35 | k | 92.53 | p | 82.24 | e | 68.09 | h | 45.27 | 45.90 | a | 56.88 | h | |
| 1995 | ----- | z | 59.56 | a | 55.39 | 63.55 | a | 67.69 | b | 79.46 | b | 91.39 | 89.89 | d | 84.35 | d | 72.74 | d | 65.28 | e | 49.23 | e | 70.77 | a | ||
| 1996 | 49.91 | h | 54.73 | c | 60.20 | a | 70.15 | d | 79.13 | p | 87.43 | p | 94.41 | d | 91.74 | 81.10 | a | 66.68 | 54.36 | b | 51.28 | m | 71.67 | d | ||
| 1997 | 47.77 | a | 52.85 | b | ----- | z | ----- | z | ----- | z | 83.77 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.55 | 56.48 | h | ||
| 1998 | 47.32 | f | 42.25 | 57.07 | a | 59.96 | d | 65.67 | a | 77.70 | 92.68 | 92.54 | g | 79.40 | 63.77 | a | 53.47 | 48.14 | b | 64.01 | b | |||||
| 1999 | 52.34 | b | 50.79 | 58.00 | d | 61.83 | 76.04 | e | 84.90 | 87.30 | d | 86.35 | 80.94 | l | 74.33 | a | 66.70 | ----- | z | 69.86 | b | |||||
| 2000 | 58.23 | i | 59.97 | 65.37 | a | 75.95 | i | 83.12 | e | 88.70 | j | 92.00 | 89.79 | b | ----- | z | 55.71 | x | 51.07 | a | 51.67 | p | 73.55 | f | ||
| 2001 | 39.13 | h | 42.86 | 58.97 | b | 62.74 | c | 85.91 | i | 90.27 | h | 89.27 | e | 92.61 | ----- | z | ----- | z | 62.64 | b | 67.86 | x | 68.18 | f | ||
| 2002 | ----- | z | 53.78 | e | ----- | z | 72.59 | m | 81.96 | g | 94.36 | e | 96.79 | b | 90.60 | a | 83.30 | 69.84 | 57.76 | i | 43.88 | g | 81.45 | f | ||
| 2003 | 55.33 | d | 50.77 | b | 61.00 | h | 61.22 | c | 78.43 | j | 88.35 | m | 96.43 | q | 89.60 | f | 84.67 | 77.92 | r | ----- | z | ----- | z | 63.00 | h | |
| 2004 | 47.48 | b | 45.85 | b | 66.52 | 68.57 | b | ----- | z | ----- | z | 92.41 | b | 88.36 | f | 80.29 | f | 68.32 | i | 51.79 | a | 47.36 | c | 60.00 | e | |
| 2005 | 44.67 | v | ----- | z | 54.50 | y | 63.00 | b | 75.36 | c | ----- | z | 94.75 | w | 90.38 | j | 78.06 | n | 61.83 | y | 60.62 | d | 49.90 | u | 66.32 | i |
| 2006 | 44.93 | p | 52.94 | k | 50.70 | d | 62.41 | a | 79.36 | i | 88.92 | q | ----- | z | 89.09 | i | 83.09 | s | 67.75 | c | 56.97 | 49.03 | a | 57.37 | g | |
| 2007 | 48.00 | b | 53.08 | c | 64.33 | a | 65.86 | i | 80.00 | p | 90.00 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.14 | i |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 46.82 | 51.42 | 57.85 | 65.78 | 75.03 | 85.01 | 91.73 | 89.04 | 81.65 | 69.89 | 56.68 | 47.38 | 68.87 | |||||||||||||
| S.D. | 5.21 | 5.05 | 4.54 | 4.76 | 4.63 | 4.10 | 2.25 | 2.33 | 3.13 | 3.35 | 4.57 | 4.60 | 1.19 | |||||||||||||
| SKEW | -0.69 | -0.59 | 0.14 | -0.08 | -0.31 | 0.29 | -0.18 | -0.46 | -0.55 | -0.26 | 0.29 | 0.03 | 0.41 | |||||||||||||
| MAX | 55.33 | 60.37 | 67.19 | 75.60 | 83.39 | 94.36 | 96.79 | 92.67 | 86.77 | 76.29 | 67.20 | 57.80 | 70.82 | |||||||||||||
| MIN | 31.94 | 38.46 | 49.75 | 52.77 | 64.82 | 77.70 | 87.30 | 83.00 | 73.54 | 62.71 | 45.27 | 39.10 | 67.31 | |||||||||||||
| YRS | 40 | 47 | 51 | 46 | 43 | 33 | 43 | 37 | 40 | 40 | 50 | 32 | 8 | |||||||||||||