| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1936 | 35.72 | v | 40.60 | c | 44.20 | d | 51.50 | f | 56.76 | 62.29 | b | 70.50 | a | 69.68 | c | 59.90 | a | 53.55 | a | 39.08 | 32.33 | a | 52.89 | |||
| 1937 | 15.30 | a | 30.38 | c | 40.60 | e | 47.13 | c | 56.65 | d | 61.66 | b | 69.48 | a | 66.18 | 61.22 | 52.92 | a | 40.73 | 34.07 | b | 48.03 | ||||
| 1938 | 35.00 | b | 33.32 | 38.61 | c | 46.21 | b | 54.56 | 64.56 | c | 72.05 | a | 65.53 | 61.63 | 47.82 | i | 36.92 | j | 35.21 | e | 50.67 | |||||
| 1939 | 33.17 | e | 35.15 | a | 44.60 | a | 51.92 | 56.08 | 60.93 | 70.71 | 71.03 | a | 62.43 | 52.23 | 41.47 | 39.56 | 51.61 | |||||||||
| 1940 | 39.40 | 41.03 | 46.16 | b | 51.16 | b | 58.69 | 69.62 | 67.81 | 70.95 | 59.03 | a | 51.39 | 37.69 | a | 34.55 | 52.29 | |||||||||
| 1941 | 35.89 | 41.66 | 44.94 | 46.23 | b | 53.30 | a | 56.00 | 70.52 | 66.07 | a | 55.91 | a | 47.76 | f | 44.28 | 36.08 | 50.08 | ||||||||
| 1942 | 34.37 | 36.93 | 41.37 | 46.37 | 51.00 | 60.50 | d | 70.03 | 69.37 | 60.85 | 52.44 | 42.71 | a | 36.77 | 50.23 | |||||||||||
| 1943 | 32.94 | d | 41.20 | 45.35 | a | 50.45 | 52.66 | 57.29 | b | 68.42 | 64.48 | 65.20 | 50.06 | 41.78 | 35.92 | 50.48 | ||||||||||
| 1944 | 34.21 | 37.89 | a | 42.15 | 45.43 | 54.27 | 60.15 | 68.63 | 66.55 | 61.50 | 54.44 | 39.50 | 34.78 | a | 49.96 | |||||||||||
| 1945 | 37.21 | 40.21 | 40.29 | 48.10 | 55.63 | 60.97 | 70.97 | 68.24 | 60.03 | 53.79 | 40.93 | 37.55 | 51.16 | |||||||||||||
| 1946 | 34.19 | 36.64 | 43.32 | a | 49.90 | 56.19 | 59.72 | 68.90 | 69.58 | a | 58.03 | 46.37 | 39.58 | 36.90 | 49.95 | |||||||||||
| 1947 | 31.76 | 42.72 | a | 46.50 | 50.42 | 59.71 | 60.22 | 66.52 | 65.13 | 61.15 | 52.82 | 40.12 | 34.35 | 50.95 | ||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.92 | 65.32 | 58.87 | 51.27 | a | 39.35 | 29.85 | a | 51.93 | |||||
| 1949 | 20.73 | 32.82 | 42.66 | 52.60 | 56.60 | j | 63.02 | 69.89 | 66.82 | 62.82 | 47.94 | 44.88 | 33.77 | 48.90 | ||||||||||||
| 1950 | 26.74 | 35.98 | 42.63 | 48.57 | 55.87 | 62.62 | 70.94 | 70.08 | 62.18 | 51.68 | a | 44.20 | 40.44 | 50.99 | ||||||||||||
| 1951 | 34.05 | 38.98 | 41.22 | a | 53.28 | a | 55.56 | 65.37 | 69.94 | 69.19 | 64.70 | 50.16 | 41.55 | 33.00 | 51.42 | |||||||||||
| 1952 | 28.58 | 36.88 | 39.31 | 50.67 | 56.53 | 59.65 | 72.40 | 67.92 | 64.28 | 55.53 | 36.23 | 33.11 | 50.09 | |||||||||||||
| 1953 | 38.94 | 40.73 | 42.23 | 47.50 | 49.32 | 56.70 | 69.55 | 66.10 | 64.97 | 48.84 | 45.65 | 36.60 | 50.59 | |||||||||||||
| 1954 | 37.23 | 41.93 | 41.71 | 50.36 | b | 58.08 | 59.35 | 68.06 | 63.82 | 56.98 | 48.85 | 43.07 | 34.24 | 50.31 | ||||||||||||
| 1955 | 30.16 | 35.88 | 41.97 | 43.32 | 54.24 | 64.80 | 66.03 | 70.23 | 58.92 | 52.74 | 39.32 | b | 37.77 | 49.61 | ||||||||||||
| 1956 | 37.21 | 32.71 | 42.61 | 51.40 | 55.77 | 60.75 | 70.88 | a | 66.29 | 61.18 | 49.85 | 39.17 | f | 31.98 | b | 50.97 | ||||||||||
| 1957 | 26.73 | a | 39.89 | 44.19 | 48.42 | 56.06 | 64.88 | 66.85 | 64.58 | 63.52 | 48.50 | b | 39.23 | 35.68 | 49.88 | |||||||||||
| 1958 | 36.26 | 44.00 | 40.18 | 47.32 | 59.87 | 63.00 | 72.65 | a | 72.73 | 61.77 | 54.73 | 42.72 | 39.82 | 52.92 | ||||||||||||
| 1959 | 38.60 | 37.79 | 44.66 | 52.42 | 52.76 | 65.35 | 72.08 | 68.24 | 58.83 | 52.94 | 39.48 | 32.10 | 51.27 | |||||||||||||
| 1960 | 34.08 | 39.59 | 46.98 | 48.15 | 53.50 | 65.48 | 73.02 | 66.69 | 62.92 | 52.02 | 41.40 | 33.81 | 51.47 | |||||||||||||
| 1961 | 37.23 | 41.68 | 42.19 | 48.23 | 52.06 | 67.68 | 69.84 | 71.58 | 58.17 | 51.95 | 38.45 | a | 34.92 | 51.17 | ||||||||||||
| 1962 | 29.16 | 37.02 | a | 41.37 | 52.88 | 52.56 | ----- | z | 67.90 | 67.92 | 64.07 | 51.54 | c | 43.02 | c | 38.56 | d | 49.64 | ||||||||
| 1963 | 32.52 | 46.02 | 42.85 | 44.47 | 57.32 | 61.58 | 66.15 | 67.05 | 64.26 | a | 52.32 | 41.69 | i | 38.02 | a | 52.05 | ||||||||||
| 1964 | 34.35 | 37.59 | 41.79 | 47.40 | 53.39 | 61.08 | 70.27 | 68.15 | 59.32 | 55.40 | 39.80 | 37.79 | 50.53 | |||||||||||||
| 1965 | 33.74 | 40.79 | 44.74 | 49.62 | 53.50 | a | 62.27 | 69.37 | 67.68 | 58.95 | 55.37 | 45.19 | d | 33.25 | a | 51.21 | ||||||||||
| 1966 | 33.60 | 37.37 | a | 43.81 | 51.15 | 59.53 | 61.77 | 66.52 | 70.11 | 62.35 | 51.63 | 41.33 | c | 35.44 | 51.22 | |||||||||||
| 1967 | 34.50 | 40.07 | 40.05 | 41.15 | c | 56.85 | a | 64.08 | 72.05 | 73.13 | 66.35 | 52.27 | c | 42.98 | a | 22.29 | 50.48 | |||||||||
| 1968 | 28.23 | 42.07 | 45.35 | 48.33 | 55.24 | 64.25 | 72.05 | 65.11 | 61.65 | 50.21 | b | 39.50 | g | 31.93 | d | 51.31 | ||||||||||
| 1969 | 29.43 | a | 34.83 | a | 42.67 | b | 47.88 | 59.65 | e | 64.28 | 69.13 | 66.85 | 62.78 | 46.34 | b | 38.17 | 35.40 | 49.79 | ||||||||
| 1970 | 37.00 | 40.71 | 43.16 | f | 43.37 | 57.94 | 66.07 | 71.15 | 68.50 | 59.10 | 50.47 | 43.90 | 32.94 | d | 51.92 | |||||||||||
| 1971 | 33.58 | l | 40.02 | 41.32 | 46.75 | 54.16 | 61.53 | 70.45 | 71.71 | 59.45 | 49.21 | 41.20 | 33.22 | k | 53.58 | |||||||||||
| 1972 | 34.98 | h | 38.31 | k | 48.52 | 46.42 | 57.12 | c | 66.00 | 71.66 | 69.90 | 59.40 | 51.92 | e | 40.95 | i | 30.33 | m | 58.87 | |||||||
| 1973 | 33.93 | j | 41.50 | j | 41.17 | j | 49.52 | i | 60.63 | h | 63.90 | 70.52 | 68.26 | 60.65 | 49.67 | d | 42.64 | h | 39.06 | o | 62.60 | |||||
| 1974 | 32.61 | h | 37.06 | j | 42.89 | h | 45.57 | h | 54.43 | c | 64.92 | 67.06 | 67.74 | 64.17 | 51.15 | 41.09 | m | 36.75 | q | 61.58 | ||||||
| 1975 | 31.28 | h | 36.53 | i | 38.79 | l | 41.41 | h | 55.35 | h | 61.65 | 68.52 | a | 64.85 | 64.17 | 50.07 | h | 38.42 | l | 37.90 | j | 64.80 | ||||
| 1976 | 37.08 | k | 37.00 | l | 41.21 | j | 44.75 | j | 55.12 | j | 59.16 | a | 69.15 | 63.71 | 62.87 | 52.65 | e | 45.19 | i | 34.22 | k | 61.51 | ||||
| 1977 | 23.14 | m | 37.50 | j | 39.65 | k | 51.86 | h | 48.80 | d | 67.40 | 69.06 | 70.00 | 59.61 | g | 50.11 | l | 40.29 | i | 38.39 | l | 63.82 | ||||
| 1978 | 39.24 | l | 40.42 | j | 48.15 | k | 46.53 | n | 50.82 | l | 61.25 | 68.45 | 65.58 | 53.82 | h | 53.03 | l | 39.02 | i | 30.82 | l | 65.09 | ||||
| 1979 | 32.50 | i | 37.74 | i | 44.92 | k | 46.19 | i | 56.46 | h | 62.92 | 68.95 | a | 66.06 | 63.54 | e | 54.67 | j | 38.60 | j | 37.80 | p | 65.37 | |||
| 1980 | 34.74 | j | 42.50 | k | 40.95 | l | 47.79 | i | 54.13 | l | 58.21 | b | 70.26 | 66.71 | 60.63 | c | 52.33 | m | 40.15 | q | 35.47 | l | 63.95 | |||
| 1981 | 38.00 | m | 39.30 | m | 42.39 | l | 51.35 | j | 54.96 | c | 64.48 | 69.84 | 70.45 | 62.43 | 47.66 | i | 44.31 | l | 38.32 | n | 64.43 | |||||
| 1982 | ----- | z | 35.50 | j | 41.23 | i | 44.12 | 56.62 | k | 63.22 | 68.03 | 67.69 | 57.27 | 48.08 | k | 38.79 | m | 33.78 | m | 60.07 | ||||||
| 1983 | 36.74 | l | 39.06 | k | 43.38 | b | 44.86 | i | 54.39 | l | 61.07 | c | 63.29 | n | 68.85 | 59.20 | 51.22 | k | 40.60 | j | 36.03 | l | 58.13 | |||
| 1984 | 34.00 | j | 38.30 | i | 45.00 | j | 44.45 | i | 54.20 | i | 59.10 | j | 71.74 | j | 69.92 | m | 61.18 | k | 46.32 | i | 37.50 | k | 32.97 | k | 9999.00 | |
| 1985 | 34.45 | i | 37.95 | i | 37.90 | j | 51.35 | 54.84 | i | 66.65 | q | 72.25 | i | 65.71 | 55.97 | 48.50 | b | 33.41 | m | 33.05 | l | 55.38 | ||||
| 1986 | 40.00 | k | 42.29 | i | 46.74 | j | 48.26 | i | 53.58 | k | 67.07 | i | 67.70 | i | 71.93 | j | 54.80 | 50.94 | 41.06 | l | 33.78 | m | 52.87 | |||
| 1987 | 32.62 | k | 38.03 | i | 41.93 | i | 52.37 | 58.32 | i | 65.83 | 65.93 | i | 67.79 | j | 60.69 | i | 55.86 | j | 41.18 | k | 35.89 | l | 59.10 | |||
| 1988 | 30.67 | m | 38.88 | i | 42.52 | a | 50.02 | i | 52.58 | k | 61.45 | 70.70 | k | 68.82 | 60.42 | j | 56.20 | k | 40.87 | k | 31.29 | j | 57.60 | |||
| 1989 | 29.65 | k | 32.10 | b | 41.15 | 51.42 | 52.92 | 62.88 | 66.56 | 64.84 | 58.32 | 48.35 | 37.11 | k | 32.10 | k | 53.17 | |||||||||
| 1990 | 32.93 | j | 28.08 | j | 43.32 | 52.18 | 50.79 | 59.10 | i | 69.26 | j | 66.18 | 59.53 | l | 49.53 | k | 36.39 | l | 26.82 | l | 53.12 | |||||
| 1991 | 31.77 | k | 41.37 | i | 35.76 | j | 44.00 | l | 49.26 | j | 56.40 | j | 69.60 | 66.87 | 62.85 | 52.63 | 39.74 | i | 30.37 | 56.46 | ||||||
| 1992 | 32.74 | j | 41.39 | j | 45.39 | i | 49.71 | i | 58.75 | k | 62.68 | 66.86 | j | 68.07 | i | 58.79 | i | 50.38 | j | 39.84 | k | 33.45 | i | 62.68 | ||
| 1993 | 28.97 | n | 35.36 | j | 46.93 | j | 45.73 | b | 54.82 | i | 59.03 | 63.60 | j | 66.65 | 61.65 | j | 51.97 | k | 36.50 | 34.23 | 48.43 | |||||
| 1994 | 36.03 | m | 37.89 | j | 45.18 | 49.75 | j | 58.31 | m | 60.55 | k | 73.70 | k | 68.75 | i | 64.50 | i | 49.25 | m | 32.81 | l | 34.19 | j | 45.18 | ||
| 1995 | 39.17 | k | 43.79 | i | 42.05 | 47.38 | j | 53.31 | m | 58.36 | i | 66.62 | k | 66.82 | 64.05 | i | 50.84 | i | 46.27 | 44.00 | r | 51.71 | ||||
| 1996 | 36.12 | n | 43.44 | l | 44.09 | i | 48.00 | 54.75 | i | 63.10 | a | 73.69 | 70.45 | 59.97 | a | 51.27 | 43.26 | k | 36.80 | k | 61.08 | |||||
| 1997 | 34.58 | k | 38.22 | j | 45.67 | j | 46.26 | i | 60.29 | j | 61.98 | 68.89 | i | 69.18 | i | 61.82 | 50.50 | i | 44.45 | k | 34.02 | j | 61.90 | |||
| 1998 | 36.75 | k | 39.03 | j | 43.61 | i | 47.43 | a | 49.47 | l | 62.05 | j | 72.48 | i | 71.64 | j | 64.60 | i | 49.86 | j | 41.07 | i | 32.18 | i | 47.43 | |
| 1999 | 34.66 | l | 35.79 | i | 40.02 | h | 44.91 | h | 53.55 | k | 60.45 | h | 67.33 | j | 67.75 | i | 62.40 | i | 52.53 | k | 45.17 | l | 34.64 | j | 9999.00 | |
| 2000 | 36.38 | k | 40.33 | i | 42.28 | h | 52.18 | k | 54.43 | i | 65.50 | h | 67.93 | k | 69.41 | i | 62.35 | j | 49.22 | k | 36.76 | i | 35.25 | m | 9999.00 | |
| 2001 | 34.67 | j | 34.84 | i | 44.95 | k | 45.62 | i | 59.32 | i | 61.75 | j | 69.43 | j | 69.46 | h | 60.22 | l | 53.57 | j | 40.95 | i | 36.17 | m | 9999.00 | |
| 2002 | 34.83 | j | 40.34 | i | 41.81 | j | 50.92 | 54.07 | i | 66.05 | j | 73.69 | j | 68.43 | i | 63.33 | j | 49.68 | i | 42.55 | k | 37.00 | j | 50.92 | ||
| 2003 | 40.74 | j | 39.47 | i | 45.21 | j | 44.70 | h | 56.40 | j | 67.74 | i | 74.73 | i | 70.36 | j | 63.31 | i | 54.80 | i | 38.28 | l | 39.64 | j | 9999.00 | |
| 2004 | 35.58 | k | 39.21 | j | 48.52 | h | 51.00 | h | 56.52 | j | 65.36 | i | 73.12 | j | 70.36 | i | 60.45 | i | 52.10 | k | 40.70 | j | 36.72 | k | 9999.00 | |
| 2005 | 31.48 | k | 40.39 | i | 45.09 | h | 47.24 | i | 55.67 | j | 59.14 | h | 73.00 | k | 71.30 | h | 60.55 | i | 51.40 | k | 40.85 | j | 36.55 | j | 9999.00 | |
| 2006 | 36.05 | k | 39.42 | i | 38.26 | h | 48.92 | j | 59.55 | i | 66.07 | h | 74.88 | k | 67.72 | h | 62.67 | j | 50.45 | j | 42.70 | j | 36.30 | k | 9999.00 | |
| 2007 | 31.65 | k | 37.11 | i | 44.73 | i | 49.14 | i | 58.70 | i | 64.29 | i | 73.07 | k | 69.89 | h | 61.16 | k | 49.00 | i | 41.97 | j | 35.45 | l | 9999.00 | |
| 2008 | 29.32 | n | 35.42 | i | 42.17 | j | 44.17 | f | 55.64 | j | 61.43 | i | 70.93 | i | 70.21 | j | 63.67 | i | 52.93 | i | 42.47 | l | 32.98 | j | 9999.00 | |
| 2009 | 36.50 | k | 40.00 | t | 41.07 | i | 48.23 | h | 56.97 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | 34.04 | r | 34.79 | p | 40.68 | l | 42.97 | n | 49.14 | m | 58.38 | m | 66.97 | p | 68.94 | m | 63.24 | m | 47.75 | m | 38.62 | n | 31.47 | o | 9999.00 | |
| 2012 | 34.50 | p | 36.71 | q | 38.44 | m | 46.50 | m | 54.92 | m | 59.71 | m | 69.20 | p | 70.92 | m | 64.61 | p | 40.20 | i | 33.90 | d | 26.62 | c | 30.26 | |
| 2013 | 24.30 | d | 27.87 | i | 36.18 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | z | 24.30 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.55 | 38.48 | 42.94 | 48.60 | 55.11 | 62.46 | 69.60 | 67.76 | 61.03 | 51.37 | 41.02 | 34.53 | 50.70 | |||||||||||||
| S.D. | 5.28 | 3.56 | 2.15 | 2.92 | 2.74 | 2.79 | 1.91 | 2.29 | 2.62 | 2.25 | 2.82 | 3.51 | 0.97 | |||||||||||||
| SKEW | -1.36 | -0.33 | 0.38 | -0.39 | -0.23 | 0.03 | -0.06 | 0.32 | -0.22 | -0.23 | -0.23 | -1.17 | -0.25 | |||||||||||||
| MAX | 39.40 | 46.02 | 48.52 | 53.28 | 59.87 | 69.62 | 73.69 | 73.13 | 66.35 | 55.53 | 46.27 | 40.44 | 52.92 | |||||||||||||
| MIN | 15.30 | 30.38 | 38.61 | 41.15 | 48.80 | 56.00 | 66.03 | 63.71 | 54.80 | 46.34 | 33.90 | 22.29 | 48.03 | |||||||||||||
| NO YRS | 34 | 36 | 41 | 44 | 40 | 53 | 50 | 56 | 52 | 43 | 35 | 38 | 25 | |||||||||||||