| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 79.03 | 72.12 | d | 62.42 | e | 33.77 | h | 24.24 | b | 59.45 | ||
| 1949 | 14.62 | b | 29.96 | 43.48 | b | 55.72 | l | 64.80 | a | 68.73 | 81.69 | b | 81.48 | 70.10 | i | 47.33 | d | 46.08 | e | 29.78 | d | 50.80 | ||||
| 1950 | 24.97 | 36.85 | a | 39.43 | c | 52.94 | m | 57.07 | c | 67.61 | b | 74.03 | 76.19 | 68.94 | l | 58.73 | e | 38.00 | a | 34.50 | c | 50.74 | ||||
| 1951 | 24.19 | 36.41 | a | 45.21 | q | 52.52 | e | 64.38 | e | 62.46 | d | 78.68 | 74.23 | 67.50 | d | 48.62 | e | 37.23 | d | 24.71 | c | 51.90 | ||||
| 1952 | 26.46 | c | 32.39 | a | 38.20 | a | 58.14 | h | 62.92 | f | 72.34 | a | 76.77 | 77.10 | 76.03 | 65.28 | f | 37.39 | b | 32.31 | b | 52.11 | ||||
| 1953 | 37.27 | a | 35.14 | 45.03 | a | 47.70 | c | 57.62 | g | 68.80 | 84.00 | 81.39 | 73.69 | d | 63.93 | d | 45.15 | d | 29.30 | d | 55.58 | |||||
| 1954 | 32.17 | a | 40.07 | a | 38.80 | a | 52.33 | c | 63.85 | e | 65.73 | 82.16 | 77.68 | 72.73 | d | 54.42 | g | 44.25 | f | 28.71 | c | 55.42 | ||||
| 1955 | 25.00 | a | 29.32 | 34.67 | a | 47.67 | c | 59.70 | h | 68.72 | a | 80.26 | 83.48 | 69.04 | b | 59.73 | i | 32.96 | d | 29.07 | d | 50.02 | ||||
| 1956 | 31.87 | 27.83 | 40.84 | 52.81 | d | 65.36 | i | 74.37 | c | 80.74 | 77.81 | 72.00 | c | 54.81 | e | 30.25 | r | 29.35 | 54.24 | |||||||
| 1957 | 18.00 | a | 36.68 | 42.10 | 47.67 | 61.58 | 68.20 | 78.42 | 79.37 | a | 66.48 | g | 53.61 | 33.78 | c | 32.71 | n | 51.94 | ||||||||
| 1958 | 29.62 | g | 38.89 | 36.81 | j | 46.20 | 68.07 | a | 69.41 | c | 74.87 | 80.58 | 69.57 | b | 61.00 | 37.73 | 32.56 | m | 60.70 | |||||||
| 1959 | 29.86 | i | 30.21 | 40.03 | 49.96 | b | 57.00 | 74.60 | 80.84 | 78.71 | 64.97 | 52.87 | 34.91 | h | 30.11 | d | 55.93 | |||||||||
| 1960 | 27.39 | c | 27.89 | b | 36.14 | j | 50.93 | 60.23 | a | 70.96 | b | 82.84 | 77.81 | 72.29 | b | 54.76 | j | 35.67 | f | 27.46 | c | 55.31 | ||||
| 1961 | 29.60 | f | 36.78 | a | 43.28 | b | 47.90 | 61.79 | b | 76.87 | 81.39 | 80.68 | 58.18 | b | 50.77 | a | 35.63 | 23.74 | 54.27 | |||||||
| 1962 | 16.26 | 29.74 | a | 38.53 | a | 52.00 | 60.00 | c | 68.57 | 76.26 | 76.19 | 70.67 | 60.43 | a | 42.50 | b | 32.03 | 51.93 | ||||||||
| 1963 | 17.52 | b | 39.46 | b | 43.29 | c | 47.40 | 61.32 | 67.07 | 80.10 | 82.16 | 71.62 | a | 60.61 | c | 40.37 | 31.00 | y | 55.54 | |||||||
| 1964 | 25.73 | a | 26.52 | 34.06 | 49.65 | d | 60.84 | 64.93 | 82.94 | 76.35 | 68.52 | g | 62.86 | j | 34.82 | h | 26.72 | f | 52.63 | |||||||
| 1965 | 29.84 | 30.50 | d | 33.13 | 50.93 | b | 57.48 | 67.67 | c | 77.55 | 74.84 | 56.79 | a | 61.97 | 42.96 | b | 32.07 | b | 51.31 | |||||||
| 1966 | 28.23 | 29.96 | c | 47.72 | m | 49.29 | b | 68.04 | c | 68.33 | 84.94 | 79.03 | 71.76 | e | 53.60 | a | 41.00 | i | 28.36 | f | 59.24 | |||||
| 1967 | 30.55 | i | 35.24 | g | 35.33 | s | 45.29 | b | 59.03 | b | 65.77 | 77.77 | 80.90 | 73.60 | 57.07 | p | 40.24 | i | 21.74 | 60.59 | ||||||
| 1968 | 24.48 | 35.21 | 44.65 | 47.03 | 59.67 | s | 67.77 | 79.39 | 71.23 | 65.60 | 57.03 | 32.47 | 26.97 | 50.17 | ||||||||||||
| 1969 | 29.32 | 33.11 | 39.77 | 54.00 | 65.90 | 64.70 | 78.87 | 83.97 | 73.77 | 48.68 | 38.10 | 29.45 | 53.30 | |||||||||||||
| 1970 | 29.57 | a | 39.28 | j | 39.04 | f | 42.42 | d | 61.26 | 71.90 | 78.77 | 83.29 | 61.33 | 51.35 | 45.88 | v | 26.48 | 56.26 | ||||||||
| 1971 | 28.81 | 31.32 | 37.06 | ----- | z | 61.24 | b | 69.55 | s | 77.71 | 83.26 | 64.23 | 52.35 | 36.03 | 20.27 | t | 52.45 | |||||||||
| 1972 | 25.95 | i | 34.45 | 48.00 | e | 50.83 | 62.03 | b | 69.90 | 75.39 | 77.32 | 63.24 | a | 53.41 | b | 36.07 | 19.36 | c | 53.64 | |||||||
| 1973 | 23.00 | d | 35.29 | 41.97 | 45.52 | a | 61.74 | 70.13 | 79.23 | 79.06 | 66.43 | 57.19 | 35.69 | a | 32.79 | b | 52.34 | |||||||||
| 1974 | 29.81 | e | 35.56 | a | 40.70 | a | 52.75 | b | 61.27 | i | 76.20 | 82.84 | 76.61 | 72.55 | a | 60.59 | d | 39.23 | h | 30.71 | q | 58.62 | ||||
| 1975 | 24.21 | q | 32.68 | f | 37.73 | p | 41.33 | l | 57.21 | c | 67.00 | 81.23 | 81.06 | 79.63 | 54.13 | 32.25 | f | 42.33 | y | 70.04 | ||||||
| 1976 | 32.35 | k | 35.05 | g | 42.89 | l | 56.89 | u | 67.04 | c | 75.83 | r | 84.32 | 77.95 | i | 69.00 | s | 57.39 | 41.74 | g | 27.00 | x | 69.58 | |||
| 1977 | 24.41 | i | 35.23 | o | 40.40 | k | 57.68 | h | 59.10 | b | 74.80 | 80.09 | i | 71.00 | z | 73.89 | u | 52.50 | z | 41.75 | v | 24.38 | r | 66.95 | ||
| 1978 | 29.00 | k | 35.13 | m | 49.20 | k | 49.18 | h | 56.52 | b | 69.47 | 75.79 | g | 70.65 | n | ----- | z | ----- | z | 30.60 | o | 24.44 | m | 62.99 | ||
| 1979 | 14.45 | b | 34.12 | c | 43.15 | e | 49.96 | c | 64.17 | g | 71.18 | b | 80.47 | a | 75.93 | b | 73.52 | e | 59.50 | e | 32.62 | f | 31.78 | h | 55.81 | |
| 1980 | 24.60 | k | 34.39 | k | 42.27 | t | 56.41 | c | 63.15 | e | 71.36 | h | 78.55 | 73.72 | b | ----- | z | 63.00 | m | 40.27 | 36.18 | c | 58.05 | |||
| 1981 | 34.11 | d | 34.22 | e | 46.23 | i | ----- | z | ----- | z | ----- | z | ----- | z | 83.77 | ----- | z | ----- | z | ----- | z | 31.36 | f | 50.70 | ||
| 1982 | 26.19 | j | ----- | z | ----- | z | ----- | z | ----- | z | 67.23 | 70.96 | c | ----- | z | ----- | z | ----- | z | 34.70 | 29.13 | 50.51 | ||||
| 1983 | ----- | z | 38.29 | 43.96 | e | 48.00 | ----- | z | 62.16 | k | 70.10 | 70.19 | 64.73 | 56.23 | 37.10 | 18.97 | 49.73 | |||||||||
| 1984 | 24.90 | 32.61 | a | 41.87 | 47.13 | 56.39 | ----- | z | 77.00 | 76.04 | d | 61.13 | 48.06 | 35.63 | 22.52 | 47.57 | ||||||||||
| 1985 | 23.19 | 26.04 | 38.10 | 52.60 | 63.84 | 70.23 | 80.48 | 74.58 | 58.57 | 51.84 | 28.10 | 21.74 | 49.11 | |||||||||||||
| 1986 | 30.03 | 33.89 | 46.29 | 53.05 | j | 60.90 | 75.27 | ----- | z | 78.29 | 59.30 | 56.94 | 36.03 | 24.58 | 50.15 | |||||||||||
| 1987 | 24.77 | 35.86 | 42.42 | 59.73 | 64.77 | 71.20 | 73.65 | 75.10 | 73.03 | 62.13 | 40.70 | 27.39 | 54.23 | |||||||||||||
| 1988 | 26.03 | 35.52 | 39.90 | 54.70 | 63.65 | 79.43 | 85.71 | 82.16 | 68.00 | 64.84 | 36.87 | 23.94 | 55.06 | |||||||||||||
| 1989 | 25.19 | 22.68 | 40.48 | 51.86 | b | 59.42 | 70.60 | 82.42 | 75.16 | 70.17 | 52.84 | 39.53 | 25.94 | 51.36 | ||||||||||||
| 1990 | 28.52 | 31.79 | 42.45 | 54.40 | 55.81 | 70.17 | 79.84 | 80.65 | 76.77 | 52.52 | 41.07 | 15.61 | 52.46 | |||||||||||||
| 1991 | 24.65 | 40.11 | 41.35 | 46.70 | 58.19 | 71.93 | 81.71 | 82.03 | 68.20 | 55.77 | 31.30 | 26.16 | 52.34 | |||||||||||||
| 1992 | 28.19 | 39.83 | 49.65 | 56.60 | 66.90 | 69.83 | 71.39 | 78.26 | 67.63 | 59.29 | 33.63 | 24.77 | 53.83 | |||||||||||||
| 1993 | 26.06 | 29.93 | 44.32 | 47.00 | 64.52 | 64.93 | 67.32 | 72.68 | 68.10 | 56.39 | 35.43 | 29.74 | 50.54 | |||||||||||||
| 1994 | 33.87 | 30.93 | 46.35 | 54.87 | 66.45 | 72.07 | 79.39 | 83.97 | 75.27 | 53.23 | 30.67 | 30.00 | 54.75 | |||||||||||||
| 1995 | 26.84 | 37.00 | 40.23 | 47.80 | 59.10 | 67.87 | 77.03 | 80.52 | 70.60 | 49.81 | 40.73 | 32.10 | 52.47 | |||||||||||||
| 1996 | 26.32 | 31.76 | 39.58 | 49.97 | 55.29 | 74.43 | 82.58 | 81.90 | 66.20 | 56.06 | 39.33 | 28.74 | 52.68 | |||||||||||||
| 1997 | 26.48 | 32.11 | 43.35 | 44.43 | 61.39 | 72.27 | 77.42 | 77.61 | 70.47 | 52.00 | 39.67 | 26.74 | 52.00 | |||||||||||||
| 1998 | 30.71 | 35.61 | 41.74 | 50.97 | 63.00 | 60.90 | 83.16 | 82.13 | 74.73 | ----- | z | 39.27 | 26.48 | 53.52 | ||||||||||||
| 1999 | 30.97 | 34.29 | 43.74 | 48.23 | 57.94 | 67.30 | 79.39 | 79.06 | 65.53 | 60.93 | b | 49.37 | 30.13 | 53.91 | ||||||||||||
| 2000 | 30.48 | 37.38 | 43.29 | 54.27 | 60.87 | 69.27 | 82.29 | 83.00 | 67.10 | 55.94 | 30.80 | 27.68 | 53.53 | |||||||||||||
| 2001 | 26.39 | 31.21 | 44.19 | 50.03 | 64.65 | 70.70 | 81.19 | 85.16 | 74.80 | 55.29 | 43.87 | 27.19 | 54.56 | |||||||||||||
| 2002 | 26.90 | 31.82 | 36.71 | 50.13 | 59.13 | 71.10 | 84.77 | 77.68 | 71.00 | 49.71 | 36.33 | 31.84 | 52.26 | |||||||||||||
| 2003 | 33.35 | 31.93 | 41.87 | 52.50 | 61.58 | 69.20 | 86.61 | 84.97 | 69.23 | 61.84 | 33.20 | 31.35 | 54.80 | |||||||||||||
| 2004 | 27.74 | 32.28 | 48.10 | 56.80 | 58.77 | 68.67 | 78.65 | 76.03 | 67.10 | 53.13 | 39.67 | 32.19 | 53.26 | |||||||||||||
| 2005 | 30.87 | 35.29 | 42.03 | 50.67 | 58.71 | 65.40 | 80.61 | 76.94 | 66.90 | 57.84 | 37.37 | ----- | z | 54.78 | ||||||||||||
| 2006 | 31.71 | 29.00 | ----- | z | 52.07 | a | 63.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 44.17 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 26.90 | 33.30 | 41.64 | 50.44 | 61.37 | 69.69 | 79.37 | 78.86 | 68.90 | 55.76 | 37.59 | 27.62 | 52.82 | |||||||||||||
| S.D. | 4.93 | 3.89 | 3.55 | 3.59 | 3.37 | 3.62 | 3.98 | 3.54 | 5.16 | 4.54 | 4.36 | 4.26 | 1.49 | |||||||||||||
| SKEW | -0.73 | -0.29 | -0.20 | 0.25 | 0.18 | 0.25 | -0.84 | -0.22 | -0.46 | 0.08 | 0.33 | -0.59 | -0.49 | |||||||||||||
| MAX | 37.27 | 40.11 | 49.65 | 59.73 | 68.07 | 79.43 | 86.61 | 85.16 | 79.63 | 64.84 | 49.37 | 36.18 | 55.06 | |||||||||||||
| MIN | 14.45 | 22.68 | 33.13 | 42.42 | 55.29 | 60.90 | 67.32 | 70.19 | 56.79 | 47.33 | 28.10 | 15.61 | 49.11 | |||||||||||||
| NO YRS | 46 | 50 | 44 | 47 | 48 | 51 | 53 | 54 | 48 | 46 | 42 | 44 | 22 | |||||||||||||