| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.79 | p | 36.32 | c | 36.32 | |
| 1956 | 33.70 | a | 31.69 | c | 47.22 | h | 62.27 | d | 71.35 | h | 74.56 | c | 89.26 | d | 84.81 | j | 79.04 | f | 57.83 | h | 46.90 | a | 39.27 | i | 56.40 | |
| 1957 | 24.94 | 37.54 | ----- | z | 56.40 | 65.26 | 75.33 | 86.06 | 85.39 | c | 85.56 | n | 60.92 | g | 45.35 | j | 38.33 | p | 61.56 | |||||||
| 1958 | 34.50 | c | 42.08 | b | 44.74 | 54.50 | 76.57 | a | ----- | z | ----- | z | ----- | z | 75.66 | a | 70.19 | 48.00 | d | 43.10 | 54.37 | |||||
| 1959 | 36.40 | a | 41.96 | c | 51.17 | h | 62.00 | e | 62.67 | g | 81.96 | f | 89.96 | d | 85.48 | d | 70.63 | c | 59.88 | f | 47.76 | e | 37.76 | f | 62.03 | |
| 1960 | 25.82 | i | 35.31 | m | 48.62 | b | 56.12 | f | 66.11 | c | 81.78 | g | 93.17 | b | 83.79 | c | 80.26 | g | 67.12 | n | 43.35 | m | 37.74 | l | 72.92 | |
| 1961 | 37.91 | i | 44.06 | k | 48.35 | n | 58.29 | f | 68.89 | m | 86.48 | e | 92.41 | i | 93.19 | e | 69.79 | a | 59.93 | b | 46.48 | e | 33.79 | q | 71.18 | |
| 1962 | 27.11 | l | 36.82 | k | 45.40 | p | 68.19 | i | 67.08 | r | 77.37 | c | 83.86 | b | 83.34 | b | 79.71 | f | 61.54 | c | 49.08 | d | 39.00 | m | 71.04 | |
| 1963 | 32.62 | g | 50.33 | a | 50.26 | h | 52.19 | c | 69.50 | i | 75.53 | m | 83.19 | d | 86.10 | 78.91 | h | 66.35 | h | 46.33 | f | 32.42 | g | 67.95 | ||
| 1964 | 33.70 | k | 38.86 | o | 43.22 | v | 58.75 | r | 72.36 | t | ----- | z | 86.50 | a | 80.41 | d | 71.72 | e | 68.83 | m | 44.86 | p | 39.46 | r | 79.54 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.65 | j | 83.38 | j | 74.65 | n | 67.46 | d | 68.08 | f | 51.83 | g | 36.35 | h | 67.46 | |
| 1966 | 37.96 | e | 38.62 | l | 51.64 | f | 61.12 | f | 72.45 | i | 74.33 | c | 86.46 | e | 86.72 | f | 79.86 | a | 63.71 | g | 50.11 | k | 34.92 | g | 69.65 | |
| 1967 | 37.64 | i | 45.35 | h | 49.89 | m | 52.60 | t | 72.20 | p | 74.15 | d | 91.04 | e | 93.83 | b | 84.42 | f | 59.62 | b | 48.00 | 33.45 | 66.68 | |||
| 1968 | 33.64 | c | 44.55 | 54.87 | a | 55.46 | b | 65.85 | k | 76.82 | b | 89.77 | 78.89 | d | 73.59 | a | 59.69 | b | ----- | z | ----- | z | 63.03 | |||
| 1969 | 33.86 | j | 34.57 | n | 46.26 | l | 61.50 | h | 72.18 | c | 74.15 | d | 86.67 | a | 88.61 | h | 76.50 | d | 56.86 | b | 50.32 | b | 39.41 | i | 69.45 | |
| 1970 | 35.65 | h | 47.68 | f | 47.21 | b | 52.24 | m | 66.04 | e | 76.43 | b | 88.56 | f | 91.23 | a | 69.81 | d | 58.89 | d | 45.96 | g | 32.20 | f | 68.27 | |
| 1971 | 36.00 | c | 42.29 | d | 43.95 | i | 59.09 | h | 68.00 | 69.70 | 86.75 | c | 93.56 | d | 69.50 | b | 58.64 | f | 43.16 | e | 31.04 | f | 63.62 | |||
| 1972 | 32.77 | i | 35.85 | c | 51.96 | d | 53.61 | b | 69.11 | d | 76.21 | a | 85.87 | a | 89.48 | d | 70.96 | f | 64.29 | j | ----- | z | ----- | z | 66.01 | |
| 1973 | 31.25 | o | 40.33 | p | 49.50 | g | 58.96 | e | 71.33 | g | 78.16 | e | 89.75 | c | 87.15 | d | 75.14 | i | 62.75 | g | 42.67 | i | 38.50 | o | 78.50 | |
| 1974 | 27.77 | i | 39.89 | i | 47.11 | l | 56.46 | f | 63.74 | d | 83.07 | 84.42 | 86.52 | d | 82.75 | f | 66.00 | d | 47.23 | h | 34.59 | d | 69.72 | |||
| 1975 | 33.35 | e | 36.52 | e | 41.52 | b | 48.59 | c | 63.89 | c | 71.82 | b | 87.21 | c | 80.80 | a | 78.24 | e | 59.88 | f | 45.24 | e | 39.56 | f | 58.72 | |
| 1976 | 37.24 | j | 37.80 | i | 43.65 | k | ----- | z | 71.38 | g | 73.24 | a | 86.60 | a | 81.00 | o | 77.39 | l | 65.42 | g | 52.93 | o | 40.89 | l | 79.92 | |
| 1977 | 29.79 | g | 46.25 | h | 47.54 | e | 66.28 | e | 59.96 | d | 81.66 | a | 85.43 | a | 86.42 | 71.50 | 63.19 | 45.12 | e | 38.97 | a | 64.61 | ||||
| 1978 | 35.75 | c | 40.64 | f | 53.86 | c | 54.81 | c | 60.93 | a | 75.37 | c | 84.97 | b | 83.06 | 70.19 | c | 67.21 | b | 43.69 | d | 30.68 | 60.05 | |||
| 1979 | 23.62 | g | 36.39 | j | 49.62 | b | 55.78 | c | 68.48 | b | 77.52 | e | 88.39 | 84.29 | c | 80.83 | 68.22 | d | 44.36 | b | 37.65 | e | 65.51 | |||
| 1980 | 33.69 | e | 39.20 | d | 47.93 | b | 60.87 | 65.19 | e | 68.93 | 85.87 | a | 82.52 | 74.93 | 63.45 | 46.33 | 38.21 | b | 58.93 | |||||||
| 1981 | 34.68 | 39.00 | b | 52.86 | c | 58.41 | c | 62.90 | 72.23 | 84.84 | 91.35 | e | 77.67 | 57.62 | b | 48.10 | a | 37.90 | 59.80 | |||||||
| 1982 | ----- | z | 33.68 | 47.06 | 53.07 | 64.23 | 74.93 | 80.68 | 86.19 | 71.60 | 59.26 | 40.73 | 34.32 | 58.70 | ||||||||||||
| 1983 | 36.00 | 39.18 | 48.48 | 53.73 | 67.16 | 72.40 | 79.32 | 85.23 | 74.00 | 64.10 | 43.67 | 28.26 | 57.63 | |||||||||||||
| 1984 | 29.45 | 31.55 | 44.79 | l | 52.73 | 62.52 | 69.40 | 86.71 | 87.77 | 70.80 | 56.10 | 41.33 | 28.81 | 56.11 | ||||||||||||
| 1985 | 28.58 | 32.21 | 40.61 | 62.77 | 67.65 | 77.57 | 91.84 | 80.79 | c | 66.58 | k | 58.45 | 34.77 | 24.26 | 54.50 | |||||||||||
| 1986 | 34.45 | 43.00 | 56.42 | 57.77 | 66.32 | 83.30 | 87.08 | s | 88.90 | 67.13 | 65.13 | 47.00 | 34.39 | 58.53 | ||||||||||||
| 1987 | 31.19 | 41.50 | 49.26 | 67.43 | 70.90 | 79.03 | 83.00 | 85.50 | a | 82.33 | 72.58 | 46.27 | 34.52 | 61.96 | ||||||||||||
| 1988 | 31.90 | 40.14 | 50.81 | 60.20 | 67.65 | 78.80 | 89.39 | 87.87 | 76.13 | 74.45 | 42.33 | 32.06 | 60.98 | |||||||||||||
| 1989 | 28.42 | 29.07 | 45.13 | 61.57 | 64.23 | 78.50 | 88.13 | 80.03 | 75.50 | 62.71 | 47.73 | 41.52 | 58.54 | |||||||||||||
| 1990 | 38.06 | 39.89 | 53.35 | 66.20 | 64.06 | 75.10 | 89.10 | 85.74 | 84.57 | 59.74 | 46.80 | 36.65 | n | 63.87 | ||||||||||||
| 1991 | 35.83 | m | 44.39 | 47.39 | 55.63 | 61.45 | 70.73 | 89.16 | 90.45 | 81.38 | n | 65.16 | 40.37 | 34.71 | 59.94 | |||||||||||
| 1992 | 33.84 | 43.72 | 57.90 | 62.00 | 76.65 | 82.50 | 81.29 | 87.32 | 75.07 | 66.39 | 37.30 | 30.35 | 61.19 | |||||||||||||
| 1993 | 26.29 | 29.57 | 41.41 | i | 54.00 | 67.56 | v | 70.30 | 74.55 | 80.90 | 78.37 | 63.39 | 42.53 | 35.42 | 55.53 | |||||||||||
| 1994 | 38.52 | 37.61 | 56.68 | 61.50 | 70.65 | 77.20 | 91.58 | 90.19 | 78.27 | o | ----- | z | 33.00 | z | 37.11 | v | 65.49 | |||||||||
| 1995 | 32.67 | s | 50.38 | l | 48.23 | 56.30 | 64.77 | 72.03 | 83.65 | 82.74 | 79.23 | 59.42 | 47.94 | n | 33.09 | t | 68.30 | |||||||||
| 1996 | 39.15 | r | 42.83 | q | 52.50 | q | 59.20 | 61.42 | 74.63 | 87.77 | 84.06 | 72.03 | 62.32 | 47.37 | 36.71 | 65.06 | ||||||||||
| 1997 | 37.35 | 41.14 | 50.26 | 55.87 | 69.65 | 72.33 | 79.10 | 84.68 | 76.87 | 61.32 | 48.03 | 35.84 | 59.37 | |||||||||||||
| 1998 | 38.00 | k | 42.18 | q | 52.47 | l | 55.75 | j | 64.79 | l | 69.43 | 87.87 | 86.55 | 79.20 | 61.26 | 43.87 | 32.65 | 65.83 | ||||||||
| 1999 | 39.97 | 36.45 | q | 50.45 | k | 55.83 | 64.81 | 73.10 | 83.55 | 84.32 | 74.97 | 65.19 | 49.57 | 34.76 | n | 65.70 | ||||||||||
| 2000 | 35.13 | ----- | z | 49.65 | 63.37 | 67.58 | 77.83 | 84.97 | 88.61 | 73.27 | 60.23 | 39.00 | 34.21 | b | 61.26 | |||||||||||
| 2001 | 32.45 | 36.93 | 51.68 | ----- | z | 72.00 | 76.30 | 84.71 | 89.16 | 79.23 | 62.29 | 49.10 | a | 34.87 | p | 63.39 | ||||||||||
| 2002 | ----- | z | ----- | z | 57.20 | z | 58.90 | 66.26 | 76.50 | 88.26 | 80.23 | 77.60 | 62.20 | a | 47.53 | 39.45 | 66.33 | |||||||||
| 2003 | 37.81 | 42.82 | 53.42 | 56.30 | 66.16 | 79.93 | 94.35 | 88.45 | 79.10 | 68.94 | 41.30 | 38.81 | 62.28 | |||||||||||||
| 2004 | 31.54 | g | 38.65 | f | 55.90 | 62.83 | 66.29 | 76.73 | 88.45 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.04 | ||||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 33.85 | 38.79 | 50.11 | 58.21 | 66.59 | 75.72 | 86.44 | 86.01 | 75.00 | 63.03 | 44.97 | 34.89 | 60.08 | |||||||||||||
| S.D. | 3.78 | 5.10 | 4.36 | 4.45 | 3.93 | 4.03 | 3.85 | 3.84 | 4.30 | 4.37 | 3.70 | 4.23 | 1.61 | |||||||||||||
| SKEW | -0.68 | -0.18 | -0.19 | 0.19 | 0.78 | 0.45 | -0.63 | 0.16 | 0.09 | 0.76 | -0.87 | -0.41 | -0.04 | |||||||||||||
| MAX | 39.97 | 50.33 | 57.90 | 67.43 | 76.65 | 86.48 | 94.35 | 93.83 | 84.57 | 74.45 | 50.32 | 43.10 | 62.28 | |||||||||||||
| MIN | 24.94 | 29.07 | 40.61 | 48.59 | 59.96 | 68.93 | 74.55 | 78.89 | 67.13 | 56.10 | 34.77 | 24.26 | 57.63 | |||||||||||||
| NO YRS | 27 | 27 | 28 | 35 | 35 | 43 | 44 | 42 | 35 | 34 | 34 | 26 | 9 | |||||||||||||