| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1938 | ----- | z | 41.25 | r | 41.24 | 49.55 | 55.87 | 64.02 | 69.61 | 64.39 | 61.98 | 49.08 | 37.70 | 38.47 | 53.19 | |||||||||||
| 1939 | 36.74 | 36.34 | 46.44 | 52.05 | 54.66 | 58.18 | 66.05 | 67.76 | 60.62 | 50.03 | 42.27 | 41.19 | 51.03 | |||||||||||||
| 1940 | 38.47 | 41.78 | 46.15 | 49.88 | 56.39 | 64.08 | 64.68 | 67.31 | 57.55 | 52.35 | 42.32 | 39.37 | 51.69 | |||||||||||||
| 1941 | 39.65 | 42.79 | 47.89 | 48.90 | 54.58 | 58.00 | 66.98 | 63.03 | 54.97 | 48.39 | 45.42 | 42.61 | l | 51.87 | ||||||||||||
| 1942 | 41.59 | o | 39.91 | 43.18 | 47.55 | 51.39 | 60.57 | 65.61 | 65.18 | 58.08 | 49.73 | 42.67 | 39.77 | 51.24 | ||||||||||||
| 1943 | 35.11 | 41.59 | a | 45.79 | 49.40 | 52.24 | 55.72 | 63.69 | 61.48 | 61.83 | 49.56 | 42.92 | 37.23 | 49.71 | ||||||||||||
| 1944 | 35.90 | 39.71 | 43.84 | 45.17 | 53.02 | 56.53 | 64.65 | 62.79 | 60.85 | 53.84 | 42.57 | 39.56 | 49.87 | |||||||||||||
| 1945 | 42.06 | 44.04 | 42.90 | 49.92 | 54.31 | j | 61.62 | j | 66.95 | 63.76 | 56.30 | 49.77 | 40.87 | 38.10 | 49.47 | |||||||||||
| 1946 | 35.03 | 36.16 | 43.89 | 49.78 | 55.98 | 57.02 | 64.92 | 65.66 | 56.52 | a | 46.32 | 41.90 | 40.73 | 49.49 | ||||||||||||
| 1947 | 35.02 | 43.52 | 47.13 | 51.68 | 57.84 | 57.91 | a | 61.23 | 60.55 | 57.90 | 52.50 | 42.53 | 38.53 | 50.53 | ||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.47 | 61.08 | 57.88 | 49.31 | 40.45 | 33.58 | 50.96 | |||||||
| 1949 | 27.53 | 35.91 | 43.32 | 51.18 | 54.87 | 60.63 | 63.85 | 61.45 | 59.22 | 47.18 | 45.82 | 36.15 | 48.93 | |||||||||||||
| 1950 | 32.29 | 38.61 | 41.60 | 47.55 | 52.77 | i | 60.42 | 66.79 | 66.77 | 59.48 | 51.31 | 45.88 | 43.37 | 50.37 | ||||||||||||
| 1951 | 37.53 | 41.00 | 40.53 | 51.43 | 53.73 | 63.25 | 65.66 | 64.84 | b | 61.60 | 48.82 | 43.53 | 36.21 | 50.68 | ||||||||||||
| 1952 | 33.77 | 37.29 | 39.82 | 48.85 | 54.55 | 56.93 | 66.94 | 61.95 | 61.45 | 54.61 | 38.22 | 38.61 | 49.42 | |||||||||||||
| 1953 | 43.69 | 40.95 | 41.08 | 47.58 | 49.52 | 54.67 | 64.52 | 62.71 | 61.68 | 48.68 | 45.72 | 38.47 | 49.94 | |||||||||||||
| 1954 | 38.92 | 43.09 | 42.69 | 50.85 | 56.97 | 56.28 | 62.02 | a | 61.05 | 56.72 | 49.82 | 44.85 | 35.96 | d | 49.94 | |||||||||||
| 1955 | 36.03 | 37.30 | 41.23 | 41.18 | 53.19 | 59.25 | 60.54 | d | 65.16 | b | 58.45 | 50.60 | 42.70 | 41.03 | 48.89 | |||||||||||
| 1956 | 38.19 | 34.69 | 42.26 | 50.00 | h | 54.92 | 59.13 | 69.23 | 64.35 | 58.90 | 50.02 | 41.10 | 36.65 | 49.95 | ||||||||||||
| 1957 | 33.63 | 41.64 | g | 45.77 | 49.66 | a | 55.66 | 62.83 | 64.40 | 61.95 | 62.22 | 49.39 | 41.50 | 40.60 | 51.60 | |||||||||||
| 1958 | 40.81 | 45.75 | 42.10 | 48.60 | 58.82 | 62.43 | 70.32 | 69.92 | 60.15 | 53.58 | 47.50 | 44.90 | 53.74 | |||||||||||||
| 1959 | 41.63 | 40.62 | 44.82 | 52.15 | 51.97 | 60.97 | 69.55 | 65.50 | 57.35 | 54.02 | 42.20 | 35.26 | 51.34 | |||||||||||||
| 1960 | 38.84 | 42.02 | 46.87 | 48.35 | 52.00 | 64.40 | 69.23 | 64.98 | 61.55 | 52.44 | 44.28 | 38.50 | 51.95 | |||||||||||||
| 1961 | 40.73 | 44.46 | 43.34 | 49.60 | 51.98 | 65.38 | 67.39 | 68.58 | 56.93 | 50.92 | 42.77 | 39.29 | 51.78 | |||||||||||||
| 1962 | 35.35 | 39.82 | 43.48 | 51.48 | 52.08 | 60.95 | 67.08 | 63.76 | 62.13 | 51.94 | 46.05 | 40.31 | 51.20 | |||||||||||||
| 1963 | 34.52 | 48.84 | 43.50 | 45.17 | 55.81 | 60.73 | 62.74 | 64.16 | 63.35 | 53.00 | 44.37 | 39.97 | 51.35 | |||||||||||||
| 1964 | 37.97 | 40.84 | 42.58 | 47.82 | 52.68 | 59.12 | 66.52 | 65.39 | 59.63 | 55.53 | 41.83 | 41.53 | 50.95 | |||||||||||||
| 1965 | 38.15 | 42.11 | 46.00 | 50.02 | 54.08 | 60.93 | 67.19 | 65.05 | 59.48 | 55.18 | 45.35 | 37.15 | 51.72 | |||||||||||||
| 1966 | 39.82 | 40.11 | 44.55 | 52.27 | 57.95 | 59.78 | 64.03 | 67.53 | 61.90 | 53.24 | 45.05 | 40.29 | 52.21 | |||||||||||||
| 1967 | 39.50 | 42.18 | 42.61 | 42.40 | 56.69 | 63.85 | 68.37 | 70.89 | 64.15 | 52.79 | 45.40 | 36.56 | 52.12 | |||||||||||||
| 1968 | 37.61 | 46.93 | 47.03 | a | 49.30 | 54.11 | 63.27 | 68.50 | 64.19 | 61.45 | 51.82 | 44.25 | 39.10 | 52.30 | ||||||||||||
| 1969 | 36.52 | 38.23 | 44.79 | 48.27 | 59.95 | 63.22 | 67.05 | 65.37 | ----- | z | ----- | z | ----- | z | ----- | z | 52.92 | |||||||||
| 1970 | ----- | z | ----- | z | ----- | z | 42.56 | v | 55.20 | a | 64.34 | a | 68.15 | a | 63.23 | 57.62 | 50.25 | a | 44.72 | 38.03 | a | 55.19 | ||||
| 1971 | 37.48 | 40.98 | 41.97 | a | 45.78 | a | 54.50 | 57.95 | a | 66.28 | b | 66.19 | 57.20 | b | 47.92 | 41.72 | 35.90 | 49.49 | ||||||||
| 1972 | 36.85 | 41.80 | b | 50.04 | f | 44.12 | q | 55.77 | 62.52 | 68.33 | b | 66.02 | b | 56.65 | 49.63 | 43.43 | 34.68 | a | 51.57 | |||||||
| 1973 | 37.03 | 42.92 | d | 41.68 | a | 49.12 | 57.29 | 62.27 | b | 66.68 | a | 63.52 | c | 59.78 | 48.61 | 42.22 | 42.68 | 51.15 | ||||||||
| 1974 | 36.29 | 38.39 | 43.67 | b | 47.55 | i | 52.82 | 62.08 | 65.16 | 66.58 | 63.66 | a | 51.56 | 43.32 | 39.31 | 51.17 | ||||||||||
| 1975 | 37.77 | 38.46 | 40.37 | a | 40.90 | 53.25 | a | 59.61 | l | 63.19 | 60.76 | 60.10 | a | 48.32 | 39.90 | 38.82 | a | 47.44 | ||||||||
| 1976 | ----- | z | ----- | z | ----- | z | 42.39 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.25 | 40.86 | 43.60 | 48.59 | 54.64 | 60.56 | 65.99 | 64.60 | 59.66 | 50.87 | 43.12 | 38.77 | 50.86 | |||||||||||||
| S.D. | 3.07 | 3.17 | 2.15 | 2.93 | 2.30 | 2.86 | 2.41 | 2.50 | 2.34 | 2.30 | 2.18 | 2.45 | 1.22 | |||||||||||||
| SKEW | -0.63 | 0.27 | 0.26 | -1.19 | 0.16 | -0.25 | -0.28 | 0.41 | 0.01 | 0.24 | -0.37 | 0.19 | 0.18 | |||||||||||||
| MAX | 43.69 | 48.84 | 47.89 | 52.27 | 59.95 | 65.38 | 70.32 | 70.89 | 64.15 | 55.53 | 47.50 | 44.90 | 53.74 | |||||||||||||
| MIN | 27.53 | 34.69 | 39.82 | 40.90 | 49.52 | 54.67 | 60.54 | 60.55 | 54.97 | 46.32 | 37.70 | 33.58 | 48.89 | |||||||||||||
| NO YRS | 34 | 34 | 35 | 33 | 35 | 35 | 38 | 38 | 37 | 37 | 37 | 36 | 25 | |||||||||||||