| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.21 | a | 32.84 | 34.52 | ||
| 1956 | 29.00 | 24.74 | 37.19 | 43.24 | e | 52.52 | 57.97 | 65.39 | 62.61 | 54.42 | 44.30 | a | 34.50 | 30.69 | 44.71 | |||||||||||
| 1957 | 17.71 | 30.09 | a | ----- | z | 45.05 | 53.16 | 60.97 | a | 64.55 | 62.00 | 57.15 | 44.77 | i | 35.00 | 32.76 | 45.84 | |||||||||
| 1958 | 29.95 | 39.66 | 34.68 | 44.68 | 60.05 | 60.85 | 66.02 | 68.69 | 56.02 | 49.04 | f | 39.40 | a | 35.72 | a | 48.70 | ||||||||||
| 1959 | 34.98 | 32.18 | 38.77 | 47.43 | 48.35 | 61.80 | 68.82 | 65.10 | 57.38 | d | 49.27 | 36.32 | 27.30 | a | 47.31 | |||||||||||
| 1960 | 24.48 | 32.17 | 39.89 | c | 45.43 | c | 48.09 | h | 61.42 | 71.38 | c | 62.85 | 58.53 | 46.94 | 35.23 | 27.93 | j | 47.83 | ||||||||
| 1961 | 32.18 | i | 37.82 | 38.58 | 44.10 | 50.48 | f | 65.69 | a | 70.12 | a | 69.63 | 53.26 | c | 44.38 | f | 33.79 | a | 28.09 | b | 49.01 | |||||
| 1962 | 20.38 | a | 30.26 | a | 36.67 | b | 48.72 | a | 49.10 | 59.78 | 63.83 | b | 61.72 | d | 60.39 | k | 47.35 | a | 40.09 | a | 36.05 | k | 45.79 | |||
| 1963 | 24.50 | d | 43.64 | j | 37.94 | 40.98 | d | 54.00 | 58.36 | a | 63.13 | a | 64.67 | a | 61.67 | a | 51.40 | g | 37.93 | a | 26.00 | n | 49.24 | |||
| 1964 | 27.86 | c | 31.19 | 34.50 | 42.12 | 49.60 | a | 57.72 | 67.08 | ----- | z | ----- | z | 46.25 | s | 34.39 | b | 31.10 | p | 43.06 | ||||||
| 1965 | 31.84 | c | ----- | z | ----- | z | ----- | z | 49.98 | b | 59.23 | 64.88 | c | 62.85 | 52.41 | a | 51.69 | j | 39.62 | b | 27.77 | a | 48.57 | |||
| 1966 | 27.82 | 29.96 | 38.87 | 44.40 | j | 56.36 | b | 58.02 | b | 64.81 | 64.69 | 60.25 | d | 45.82 | f | 38.48 | d | 30.87 | a | 47.01 | ||||||
| 1967 | 33.03 | 35.56 | a | 36.23 | 38.23 | h | 53.66 | c | 59.48 | a | 69.37 | a | 68.38 | b | 60.70 | b | 46.30 | h | 38.32 | 27.11 | 48.18 | |||||
| 1968 | 28.79 | e | 38.66 | 40.88 | c | 42.85 | j | 53.91 | b | 63.02 | c | 71.39 | 64.68 | c | 58.83 | 48.57 | j | 39.66 | a | 31.58 | 49.14 | |||||
| 1969 | 30.27 | a | 29.17 | b | 35.90 | 48.15 | g | 58.14 | b | 62.60 | 67.73 | 66.61 | 60.92 | e | 44.62 | e | 39.09 | c | 33.19 | 48.02 | ||||||
| 1970 | 32.97 | 38.40 | b | 39.82 | 40.85 | g | 54.81 | 63.59 | a | 69.26 | 67.37 | 55.00 | 48.11 | l | 39.62 | 27.55 | 48.84 | |||||||||
| 1971 | 33.63 | 35.88 | 35.94 | 43.56 | e | 55.57 | d | 59.31 | a | 68.22 | d | 69.55 | 54.91 | b | 40.00 | k | 38.37 | 29.12 | a | 47.64 | ||||||
| 1972 | 28.02 | g | 34.62 | 44.96 | d | 45.16 | e | 56.07 | d | 63.15 | f | 67.54 | f | 67.21 | 52.40 | 45.90 | a | 35.46 | c | 17.78 | d | 44.40 | ||||
| 1973 | 26.10 | 32.84 | 35.75 | a | 40.30 | b | 55.31 | d | 59.69 | f | 67.83 | b | 65.71 | 57.21 | d | 48.29 | 36.74 | e | ----- | z | 46.61 | |||||
| 1974 | 28.47 | b | 33.70 | c | 37.53 | b | 45.16 | e | 50.33 | g | 63.50 | f | 70.89 | q | 62.74 | b | 60.02 | f | 47.33 | g | 37.04 | c | ----- | z | 40.77 | |
| 1975 | 23.75 | k | 30.84 | c | 32.91 | i | 37.94 | d | 50.27 | i | 57.75 | l | 65.17 | v | 61.95 | l | 58.45 | j | 43.50 | r | 28.73 | q | 35.29 | q | 34.39 | |
| 1976 | 31.31 | o | 31.50 | j | 31.48 | h | 43.45 | t | 52.14 | f | 54.06 | l | 67.26 | h | 59.92 | s | 56.33 | o | 45.11 | m | 39.25 | v | 26.97 | p | 9999.00 | |
| 1977 | 21.05 | i | 30.67 | e | 33.67 | d | 48.09 | c | 44.24 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.48 | |
| 1978 | 33.70 | f | 34.58 | b | 43.94 | 43.55 | 50.08 | 58.65 | 67.67 | g | 62.19 | d | 53.85 | d | 47.84 | b | 31.79 | a | 24.18 | a | 45.06 | |||||
| 1979 | 18.21 | g | 34.62 | 40.89 | 43.69 | c | 53.41 | d | 61.46 | d | 68.52 | d | 67.74 | n | 60.38 | f | 47.75 | g | 31.74 | c | 33.00 | a | 45.92 | |||
| 1980 | 28.87 | d | 38.38 | 38.60 | a | 47.82 | b | 51.98 | 54.39 | k | 67.35 | 62.18 | c | 58.52 | c | 47.05 | 38.95 | b | 29.48 | d | 46.29 | |||||
| 1981 | 31.87 | d | 37.06 | j | 39.45 | 47.11 | b | 51.75 | g | 58.02 | a | 65.02 | 67.48 | b | 56.13 | c | 44.96 | e | 38.21 | b | 34.10 | 48.23 | ||||
| 1982 | 23.92 | 35.91 | l | 37.61 | 41.48 | 50.85 | 59.10 | 64.60 | 65.55 | 54.52 | 44.75 | i | 31.08 | 27.61 | 45.63 | |||||||||||
| 1983 | 33.10 | 37.00 | 40.74 | 41.57 | 52.24 | 57.28 | 63.79 | n | ----- | z | 55.72 | ----- | z | ----- | z | ----- | z | 45.38 | ||||||||
| 1984 | ----- | z | ----- | z | 40.48 | d | 42.78 | e | 52.00 | f | 49.54 | r | 67.38 | n | 66.54 | c | 52.83 | g | 40.38 | g | ----- | z | ----- | z | 49.93 | |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1986 | ----- | z | ----- | z | ----- | z | 46.53 | n | 67.40 | u | 62.28 | n | 60.79 | l | ----- | z | 50.88 | 47.24 | 41.15 | 28.07 | q | 46.43 | ||||
| 1987 | 24.18 | 32.09 | k | 38.56 | m | 51.20 | b | 55.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.69 | ||
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1989 | ----- | z | ----- | z | ----- | z | 51.78 | 51.68 | 63.48 | 68.32 | 62.76 | 57.03 | 46.97 | 35.65 | d | 29.97 | 51.96 | |||||||||
| 1990 | 33.24 | 30.55 | 39.29 | 50.77 | 48.55 | 60.17 | 69.13 | 66.21 | 60.63 | 46.93 | a | 38.17 | 21.44 | 47.09 | ||||||||||||
| 1991 | 28.10 | 38.98 | 36.56 | 43.28 | 48.82 | 57.17 | 68.11 | ----- | z | 60.73 | 48.53 | 40.43 | 30.85 | 45.60 | ||||||||||||
| 1992 | 30.73 | 40.52 | 44.26 | 48.93 | 56.63 | 61.53 | 63.66 | 65.37 | a | ----- | z | 49.81 | 34.22 | 26.39 | 47.46 | |||||||||||
| 1993 | 21.77 | 22.21 | 39.89 | 44.05 | 55.89 | 56.17 | 58.35 | 61.74 | 57.00 | 48.56 | 31.47 | 31.87 | 44.08 | |||||||||||||
| 1994 | 32.87 | 31.52 | 43.34 | 47.05 | 54.32 | 59.93 | 68.31 | 66.29 | 57.27 | 47.90 | 28.87 | 28.73 | 47.20 | |||||||||||||
| 1995 | 34.19 | 42.23 | 42.08 | 44.65 | ----- | z | 57.33 | a | 63.74 | 61.69 | 57.55 | 49.32 | 39.83 | ----- | z | 49.26 | ||||||||||
| 1996 | 32.76 | 35.87 | b | 42.34 | 46.80 | 48.40 | 58.17 | 67.83 | j | 64.08 | ----- | z | 46.83 | a | ----- | z | 37.37 | 45.85 | ||||||||
| 1997 | 30.66 | 36.71 | 45.45 | 44.52 | 54.95 | 57.63 | 64.26 | 64.03 | 58.63 | 48.06 | f | 39.30 | ----- | z | 49.62 | |||||||||||
| 1998 | 35.81 | 37.52 | 41.58 | 43.23 | 45.21 | 56.37 | 68.97 | 65.90 | 57.05 | 45.52 | b | 37.65 | 27.34 | 46.85 | ||||||||||||
| 1999 | ----- | z | 29.88 | 37.11 | 43.23 | 48.02 | 57.37 | 65.97 | 63.27 | 54.93 | 53.42 | 42.43 | a | 28.11 | 47.61 | |||||||||||
| 2000 | 33.05 | 37.26 | 44.42 | a | 48.08 | 49.26 | 58.32 | b | 66.55 | 67.92 | 56.55 | a | 48.25 | a | 33.38 | i | 27.65 | 48.85 | ||||||||
| 2001 | 25.55 | b | 29.07 | 42.08 | 41.88 | 54.29 | 56.82 | 64.18 | 67.73 | 58.87 | 47.08 | 35.75 | 31.97 | 46.27 | ||||||||||||
| 2002 | 32.11 | 36.77 | 40.15 | 45.88 | 48.58 | a | 55.30 | 70.55 | 62.21 | 54.00 | 44.21 | 32.68 | 36.27 | 46.56 | ||||||||||||
| 2003 | 38.77 | 35.40 | g | 40.50 | 43.22 | 51.26 | 60.87 | 72.69 | 66.77 | 61.03 | 49.19 | 33.18 | 34.61 | 50.19 | ||||||||||||
| 2004 | 27.11 | 30.88 | 45.53 | 48.05 | 52.81 | 57.68 | 65.02 | 62.65 | 56.28 | 44.52 | 35.95 | 36.84 | 46.94 | |||||||||||||
| 2005 | 33.06 | 36.02 | 42.37 | ----- | z | 50.06 | 51.15 | 68.03 | 63.58 | 53.03 | 46.26 | 35.52 | 23.66 | 45.70 | ||||||||||||
| 2006 | 36.79 | ----- | z | 37.06 | ----- | z | 54.27 | 59.75 | 70.37 | 61.85 | 57.68 | ----- | z | ----- | z | 27.42 | 50.65 | |||||||||
| 2007 | 23.63 | 36.14 | 44.48 | 43.47 | 47.73 | 64.18 | 70.89 | 64.71 | 54.73 | 43.26 | 38.58 | 23.98 | 46.32 | |||||||||||||
| 2008 | 17.70 | a | 29.64 | 31.69 | 37.50 | 48.02 | 51.60 | 65.15 | 67.05 | 54.50 | ----- | z | ----- | z | 28.24 | 43.11 | ||||||||||
| 2009 | 35.26 | ----- | z | ----- | z | ----- | z | 58.36 | x | 62.91 | s | 69.42 | r | 68.55 | l | 62.19 | l | 45.50 | q | 36.97 | j | 24.50 | h | 35.26 | ||
| 2010 | 34.81 | j | 33.88 | k | 41.58 | k | 43.65 | j | 49.61 | i | 60.17 | g | 67.20 | i | 66.09 | h | 57.54 | p | 47.75 | m | 37.75 | r | 33.13 | p | 9999.00 | |
| 2011 | 30.39 | m | 29.79 | p | 40.24 | n | 43.20 | o | 50.17 | m | 58.24 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 29.44 | 33.87 | 39.54 | 44.82 | 52.20 | 59.15 | 67.04 | 64.92 | 56.70 | 47.15 | 36.62 | 29.55 | 46.33 | |||||||||||||
| S.D. | 5.02 | 4.31 | 3.37 | 3.23 | 3.34 | 2.97 | 2.90 | 2.37 | 2.71 | 2.13 | 3.09 | 4.29 | 1.09 | |||||||||||||
| SKEW | -0.57 | -0.40 | -0.04 | 0.08 | 0.13 | -0.35 | -0.41 | 0.25 | 0.01 | 0.55 | -0.47 | -0.35 | -1.15 | |||||||||||||
| MAX | 38.77 | 42.23 | 45.53 | 51.78 | 60.05 | 65.69 | 72.69 | 69.63 | 61.67 | 53.42 | 42.43 | 37.37 | 47.31 | |||||||||||||
| MIN | 17.70 | 22.21 | 31.69 | 37.50 | 45.21 | 51.15 | 58.35 | 61.69 | 50.88 | 43.26 | 28.87 | 17.78 | 44.08 | |||||||||||||
| NO YRS | 41 | 40 | 44 | 41 | 40 | 41 | 40 | 42 | 40 | 28 | 42 | 37 | 10 | |||||||||||||