| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.75 | b | 44.52 | 49.13 | ||
| 1957 | 34.81 | j | 51.80 | m | 53.28 | b | 58.71 | b | 67.26 | 83.85 | c | 90.61 | c | 87.03 | b | 81.10 | j | 61.61 | 46.30 | c | 44.69 | b | 65.93 | |||
| 1958 | 40.67 | a | 50.24 | g | 46.48 | b | 59.14 | b | ----- | z | 83.00 | r | 91.96 | c | 95.00 | d | 80.53 | 73.65 | 53.38 | d | 51.50 | c | 65.81 | |||
| 1959 | 44.03 | 44.65 | b | 56.19 | 69.41 | a | 67.69 | e | 86.50 | 96.32 | 89.66 | b | 74.63 | 68.84 | 58.37 | 45.75 | c | 66.84 | ||||||||
| 1960 | 35.10 | 40.83 | 56.60 | a | 64.31 | a | 71.39 | 88.86 | b | 96.00 | 89.32 | 86.29 | b | 68.81 | 49.47 | 45.80 | a | 66.06 | ||||||||
| 1961 | 49.06 | 49.77 | b | 53.39 | 64.30 | 71.08 | e | 88.82 | b | 93.34 | b | 91.96 | g | 74.00 | a | 67.46 | c | 49.97 | a | 39.87 | h | 66.12 | ||||
| 1962 | 35.97 | b | 39.29 | g | 48.33 | g | 70.42 | f | 67.96 | f | 84.12 | d | 90.33 | g | 87.52 | d | 84.61 | b | ----- | z | 62.46 | d | 60.65 | k | 70.93 | |
| 1963 | 41.42 | e | 56.46 | 49.00 | g | 49.90 | a | 64.29 | g | 75.31 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.77 | ||
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | 78.36 | i | 81.75 | j | 89.12 | g | 90.44 | d | 82.31 | d | ----- | z | 49.84 | e | 39.15 | d | 65.44 | |
| 1967 | 37.46 | e | 47.17 | e | 49.07 | d | ----- | z | 73.44 | f | 77.35 | d | 92.26 | d | ----- | z | 84.46 | d | 67.58 | e | ----- | z | ----- | z | 65.05 | |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 83.50 | f | 93.39 | 81.10 | 79.47 | 68.00 | c | 48.47 | 38.10 | 68.09 | ||||||
| 1969 | 37.61 | 40.64 | 50.61 | 64.40 | 78.93 | a | 78.77 | 90.52 | 91.94 | 82.62 | d | 57.55 | 55.47 | 41.26 | 64.19 | |||||||||||
| 1970 | 40.52 | 53.00 | 52.13 | 55.00 | ----- | z | 80.97 | 91.71 | 92.65 | 78.57 | 64.94 | ----- | z | 35.80 | a | 64.53 | ||||||||||
| 1971 | 42.35 | 48.46 | 51.90 | 61.57 | 68.13 | 78.43 | 92.68 | 94.10 | 76.33 | 61.06 | 49.50 | 35.00 | 63.29 | |||||||||||||
| 1972 | 36.81 | 46.10 | 61.07 | a | 60.93 | 77.32 | 84.93 | 91.90 | 91.81 | 72.86 | i | 64.68 | 47.17 | ----- | z | 66.27 | ||||||||||
| 1973 | 38.91 | i | 47.39 | 49.87 | 62.17 | ----- | z | ----- | z | 94.03 | b | 89.42 | ----- | z | ----- | z | 46.80 | 43.35 | e | 61.86 | ||||||
| 1974 | 39.52 | 44.50 | 53.61 | 60.50 | 71.06 | 88.73 | 88.14 | b | 89.00 | ----- | z | ----- | z | ----- | z | ----- | z | 66.88 | ||||||||
| 1975 | ----- | z | ----- | z | ----- | z | 54.93 | o | 69.97 | a | 79.74 | g | 92.74 | l | 85.71 | c | ----- | z | 62.53 | a | ----- | z | 40.05 | k | 72.74 | |
| 1976 | 41.24 | b | 47.89 | a | 52.31 | b | 62.74 | c | 77.07 | a | 78.12 | d | 90.61 | 80.93 | c | 78.00 | 67.61 | ----- | z | 47.46 | c | 65.82 | ||||
| 1977 | 34.73 | a | 50.52 | a | 49.97 | b | 69.07 | b | 62.23 | 84.90 | 88.71 | c | 88.07 | b | 77.17 | a | 69.43 | c | 51.38 | a | 43.07 | c | 64.10 | |||
| 1978 | 41.59 | b | 45.29 | ----- | z | 57.20 | 67.55 | 79.00 | a | 88.62 | b | 86.03 | 74.93 | c | 72.21 | b | 47.79 | a | 37.52 | b | 63.43 | |||||
| 1979 | 33.71 | 41.85 | a | 55.39 | c | 61.91 | g | 73.68 | 83.71 | b | 90.19 | e | ----- | z | 83.16 | e | 68.42 | 48.20 | e | 41.25 | c | 61.96 | ||||
| 1980 | 38.93 | b | 48.28 | 49.73 | e | 64.45 | a | 69.59 | b | 75.19 | c | 88.22 | d | 86.13 | 78.93 | a | 69.55 | b | ----- | z | 48.74 | l | 66.90 | |||
| 1981 | 45.48 | b | 48.58 | d | 53.76 | b | 64.95 | h | 68.40 | a | 83.17 | a | 89.56 | m | 92.90 | k | 82.42 | d | 61.85 | d | 52.04 | c | 44.36 | c | 60.01 | |
| 1982 | 35.42 | 43.18 | 49.29 | 60.90 | i | 71.03 | 78.30 | 85.87 | ----- | z | 73.33 | 62.90 | 45.17 | 37.13 | p | 60.50 | ||||||||||
| 1983 | 42.16 | 46.93 | 49.68 | 55.67 | 69.26 | 76.17 | 84.61 | 87.06 | 79.87 | 68.68 | 47.10 | 37.00 | 62.02 | |||||||||||||
| 1984 | 31.35 | 41.24 | 51.65 | 55.80 | 71.19 | 76.67 | ----- | z | 88.90 | 79.10 | 58.48 | 48.00 | 39.38 | j | 60.24 | |||||||||||
| 1985 | 37.35 | 40.82 | 50.06 | 67.73 | 72.52 | 87.00 | 92.84 | l | 85.53 | a | 70.87 | 65.29 | 43.00 | 37.62 | r | 62.02 | ||||||||||
| 1986 | 47.35 | 50.43 | 61.00 | m | 63.53 | 74.48 | 90.00 | u | 89.33 | s | 95.53 | n | 71.77 | 71.43 | a | 54.79 | b | 47.10 | k | 61.97 | ||||||
| 1987 | 36.81 | 50.14 | 54.61 | 72.63 | 74.52 | 85.53 | 87.16 | 92.83 | a | 87.67 | 77.94 | 53.57 | 41.81 | 67.93 | ||||||||||||
| 1988 | 38.47 | a | 52.52 | 59.10 | 67.07 | 73.29 | 85.53 | 95.32 | 93.29 | 81.27 | 79.68 | 49.80 | j | 38.45 | 69.45 | |||||||||||
| 1989 | 33.42 | 36.14 | 53.68 | 69.23 | 72.06 | 85.13 | 94.90 | 87.57 | a | 81.27 | 67.10 | 55.47 | 46.39 | 65.20 | ||||||||||||
| 1990 | 42.97 | 42.43 | 59.87 | 70.57 | 69.35 | 83.90 | 93.35 | 91.10 | 87.10 | 70.71 | 52.50 | 32.58 | 66.37 | |||||||||||||
| 1991 | 40.45 | 57.18 | 50.81 | 59.43 | 66.43 | a | 79.97 | 94.23 | 92.45 | 84.60 | 70.84 | 52.70 | 44.10 | 66.10 | ||||||||||||
| 1992 | 44.48 | 53.66 | 62.52 | 70.40 | 83.35 | 83.57 | 89.97 | 92.23 | 84.00 | 72.23 | 50.17 | 36.23 | 68.57 | |||||||||||||
| 1993 | 29.58 | 37.21 | 56.13 | 61.73 | 76.55 | 76.37 | 82.87 | 86.29 | 82.43 | 68.52 | 49.31 | a | 42.52 | 62.46 | ||||||||||||
| 1994 | 48.29 | 44.46 | 62.29 | 65.00 | 73.65 | 84.41 | a | 94.39 | 93.97 | 84.70 | 66.29 | g | 39.90 | 35.03 | 66.01 | |||||||||||
| 1995 | 41.06 | 58.29 | 52.03 | a | ----- | z | 67.84 | 78.03 | 89.55 | 92.09 | h | 84.90 | 71.69 | e | 60.93 | 45.90 | 65.02 | |||||||||
| 1996 | 41.10 | 46.83 | e | 56.32 | 63.17 | 68.36 | q | 83.56 | c | 94.90 | 92.97 | 81.23 | 67.29 | 55.23 | 44.16 | 66.07 | ||||||||||
| 1997 | 40.61 | 47.14 | 59.32 | 61.30 | ----- | z | 79.87 | 90.17 | a | 92.29 | 82.77 | 68.05 | i | 53.83 | 40.26 | 64.76 | ||||||||||
| 1998 | 44.16 | 42.39 | 54.39 | 59.80 | 65.58 | ----- | z | 95.19 | 95.68 | 81.20 | 63.58 | 47.67 | 37.13 | 62.43 | ||||||||||||
| 1999 | 43.16 | 47.32 | 54.32 | 60.23 | 72.90 | 83.00 | 93.71 | 89.81 | 82.53 | 72.47 | a | 57.10 | 45.48 | 66.84 | ||||||||||||
| 2000 | 42.06 | 45.83 | 54.81 | 69.23 | 72.41 | i | 86.17 | 91.13 | 90.23 | 78.59 | a | 63.94 | 43.70 | 43.92 | r | 66.57 | ||||||||||
| 2001 | 38.29 | 42.63 | a | 57.97 | a | 61.41 | a | 80.23 | 85.95 | k | 88.97 | 92.13 | 81.40 | 70.19 | 51.33 | 36.19 | 63.70 | |||||||||
| 2002 | 37.97 | 46.57 | 51.26 | 65.90 | 73.73 | i | 85.60 | j | 93.87 | 85.86 | c | ----- | z | 67.35 | 52.43 | 45.00 | 60.69 | |||||||||
| 2003 | 50.48 | 47.21 | 58.26 | 57.70 | j | 76.91 | i | 86.20 | 94.81 | 89.00 | 82.30 | 72.94 | 46.67 | 39.65 | 66.75 | |||||||||||
| 2004 | 37.58 | 40.62 | e | 63.42 | 67.80 | 72.55 | 83.87 | 91.55 | ----- | z | 80.31 | d | 64.20 | a | 48.63 | 40.74 | 62.84 | |||||||||
| 2005 | 31.33 | a | 40.79 | 56.16 | 61.50 | 69.87 | 78.87 | 94.58 | 91.88 | f | 76.63 | ----- | z | 52.70 | 38.13 | 60.06 | ||||||||||
| 2006 | 42.81 | 47.87 | e | 48.00 | 61.00 | e | 76.65 | 84.50 | 95.42 | ----- | z | 79.31 | q | 65.05 | i | 49.40 | 38.19 | 60.43 | ||||||||
| 2007 | 40.23 | ----- | z | 61.80 | a | 63.47 | 76.77 | 84.77 | 94.61 | 90.29 | 77.13 | 61.74 | 53.23 | 37.28 | f | 70.40 | ||||||||||
| 2008 | 32.27 | e | 42.26 | f | 52.52 | 60.07 | 69.74 | 81.10 | 91.52 | 90.23 | ----- | z | 66.32 | 55.12 | e | 37.52 | 63.64 | |||||||||
| 2009 | 39.60 | f | 46.11 | 53.03 | 62.77 | 75.72 | b | 76.80 | 90.55 | ----- | z | 82.80 | 60.16 | 52.70 | 33.68 | 63.43 | ||||||||||
| 2010 | 39.84 | f | 46.04 | 54.65 | e | ----- | z | 62.13 | 78.47 | 88.84 | 86.26 | 81.30 | 66.84 | f | 46.47 | 40.87 | 65.00 | |||||||||
| 2011 | 38.87 | a | 42.27 | b | 50.30 | a | 55.69 | a | 66.00 | a | ----- | z | ----- | z | 91.70 | a | 86.64 | b | 68.55 | b | 48.07 | a | ----- | z | 60.90 | |
| 2012 | 45.52 | b | 47.56 | d | 56.97 | 64.00 | ----- | z | 82.13 | 92.94 | 88.55 | 84.28 | a | 65.23 | 52.07 | 36.19 | 65.04 | |||||||||
| 2013 | 24.42 | 44.71 | 61.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.57 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 39.50 | 46.34 | 54.27 | 62.79 | 71.63 | 82.06 | 91.65 | 89.57 | 80.68 | 67.39 | 50.84 | 40.79 | 65.38 | |||||||||||||
| S.D. | 5.17 | 4.80 | 4.15 | 4.80 | 4.64 | 3.92 | 3.10 | 3.36 | 4.06 | 4.72 | 4.46 | 4.35 | 2.04 | |||||||||||||
| SKEW | -0.37 | 0.40 | 0.47 | -0.17 | 0.23 | -0.12 | -0.71 | -0.51 | -0.54 | 0.19 | 0.23 | 0.18 | -0.22 | |||||||||||||
| MAX | 50.48 | 58.29 | 63.42 | 72.63 | 83.35 | 88.86 | 96.32 | 95.68 | 87.67 | 79.68 | 62.46 | 51.50 | 68.57 | |||||||||||||
| MIN | 24.42 | 36.14 | 46.48 | 49.90 | 62.13 | 75.19 | 82.87 | 80.93 | 70.87 | 57.55 | 39.90 | 32.58 | 62.02 | |||||||||||||
| NO YRS | 48 | 47 | 47 | 43 | 40 | 44 | 45 | 42 | 45 | 44 | 47 | 40 | 13 | |||||||||||||