| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.77 | 27.61 | 30.19 | |||
| 1938 | 25.75 | c | 29.79 | 31.87 | 40.57 | 43.81 | 54.07 | 58.10 | 53.84 | 55.57 | w | ----- | z | ----- | z | 24.48 | 40.25 | |||||||||
| 1939 | 25.84 | 24.19 | a | 31.87 | a | 39.07 | 46.97 | 50.93 | 61.42 | 57.29 | 45.10 | 37.45 | 23.60 | 28.28 | b | 39.33 | ||||||||||
| 1940 | 26.10 | 31.08 | c | 33.42 | 40.30 | 48.81 | 56.13 | 62.32 | 58.58 | 50.70 | 40.13 | 28.72 | a | 26.00 | 41.86 | |||||||||||
| 1941 | 26.06 | 28.71 | 31.90 | 37.60 | 48.10 | a | 53.37 | 61.23 | 59.10 | 44.93 | 37.58 | 29.50 | 29.10 | 40.60 | ||||||||||||
| 1942 | 14.32 | 24.18 | 28.32 | 39.43 | 43.87 | 50.47 | 58.35 | 55.84 | 47.30 | 37.55 | 30.20 | 29.16 | 38.25 | |||||||||||||
| 1943 | 22.74 | 24.11 | 29.65 | 42.40 | 43.58 | 50.83 | 57.58 | 56.06 | 47.07 | 39.97 | 28.90 | 24.61 | 38.96 | |||||||||||||
| 1944 | 12.26 | 27.83 | 27.81 | 36.83 | 46.84 | 51.53 | 58.32 | 54.23 | 45.13 | 36.94 | 31.00 | 24.00 | 37.73 | |||||||||||||
| 1945 | 26.23 | 29.75 | 30.48 | 37.83 | 47.32 | 50.87 | 59.03 | 55.32 | 43.63 | 34.42 | 31.70 | 22.90 | 39.12 | |||||||||||||
| 1946 | 21.97 | 24.79 | 33.45 | 37.97 | 45.00 | 52.33 | 60.29 | 57.00 | 43.73 | 34.10 | 30.63 | 28.61 | 39.16 | |||||||||||||
| 1947 | 13.87 | 27.89 | 31.52 | 39.13 | 50.61 | 51.77 | 58.35 | 54.68 | 45.73 | 41.03 | 30.40 | 25.61 | 39.22 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.15 | e | 54.11 | c | 46.28 | a | 34.94 | 29.57 | 16.06 | 39.85 | ||||
| 1949 | 0.03 | 21.82 | 33.74 | d | 39.96 | b | 49.93 | c | 53.97 | a | 58.66 | b | 56.88 | e | 47.76 | e | 33.00 | b | 29.60 | 24.67 | a | 37.50 | ||||
| 1950 | 17.03 | a | 21.54 | 30.61 | 36.75 | b | 42.32 | c | 51.66 | a | 60.41 | d | 55.08 | e | 48.00 | b | 40.03 | a | 30.83 | 31.61 | 38.82 | |||||
| 1951 | 22.90 | a | 25.68 | 26.07 | d | 37.16 | e | 45.84 | f | 50.12 | d | 58.55 | b | 55.58 | e | 44.71 | b | 36.60 | a | 25.48 | a | 22.52 | 36.85 | |||
| 1952 | 18.48 | 19.82 | a | 28.33 | a | 36.63 | c | 44.64 | f | 51.69 | d | 54.86 | b | 56.25 | c | 45.26 | c | 34.67 | a | 20.27 | 25.07 | a | 35.58 | |||
| 1953 | 31.33 | a | 26.07 | a | 29.21 | b | 34.96 | b | 40.78 | h | 48.04 | b | 58.47 | a | 56.75 | g | 47.42 | d | 34.76 | b | 33.38 | a | 26.23 | 36.99 | ||
| 1954 | 28.16 | 29.85 | a | 28.83 | a | 37.75 | b | 45.44 | d | 49.73 | d | 59.04 | f | 54.20 | f | 44.57 | g | 32.57 | a | 29.90 | a | 20.23 | a | 33.61 | ||
| 1955 | 17.94 | 17.15 | a | 25.83 | g | 34.74 | g | 43.85 | k | 54.36 | h | 57.04 | g | 55.40 | f | 45.43 | b | 36.04 | c | 25.20 | 25.81 | 27.93 | ||||
| 1956 | 25.58 | 17.19 | b | 30.28 | b | 38.20 | 48.45 | 51.57 | 58.94 | 55.26 | 44.73 | 36.58 | 25.53 | 23.65 | 38.00 | |||||||||||
| 1957 | 10.00 | 19.46 | 32.57 | a | 39.10 | 47.58 | 52.93 | 55.35 | 54.29 | 45.77 | 37.74 | 24.57 | 28.58 | 37.33 | ||||||||||||
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.48 | a | ----- | z | 24.48 | |
| 1962 | 11.71 | 24.61 | 28.90 | 38.97 | 45.39 | 52.47 | 56.65 | 54.16 | 45.13 | 37.58 | 31.00 | 27.74 | 37.86 | |||||||||||||
| 1963 | 14.90 | 29.96 | 31.74 | 36.63 | 49.06 | 53.53 | 57.23 | 57.10 | 51.67 | 41.16 | 32.30 | 22.19 | 39.79 | |||||||||||||
| 1964 | 18.77 | 16.31 | 29.84 | 36.67 | 43.94 | 52.67 | 59.16 | 54.29 | 44.63 | 34.97 | 29.30 | 25.65 | 37.18 | |||||||||||||
| 1965 | 24.74 | 26.00 | 24.48 | 41.73 | 44.87 | 53.50 | 58.16 | 56.10 | 42.63 | 36.61 | 32.67 | 21.06 | 38.55 | |||||||||||||
| 1966 | 25.52 | 24.96 | 30.32 | 36.83 | 47.35 | 52.77 | 58.03 | 57.23 | 51.63 | 33.26 | 33.53 | 25.71 | 39.76 | |||||||||||||
| 1967 | 27.65 | 26.96 | 30.68 | 34.67 | 44.16 | 53.67 | 61.90 | 58.48 | 50.93 | 35.19 | 31.33 | 20.03 | 39.64 | |||||||||||||
| 1968 | 21.23 | 30.00 | 32.77 | 34.93 | b | 44.86 | b | 53.47 | 59.81 | 55.23 | 45.83 | 34.06 | 31.03 | 26.23 | 39.12 | |||||||||||
| 1969 | 23.90 | 26.29 | 27.77 | 38.20 | 49.00 | 54.53 | 56.68 | 54.29 | 47.30 | 34.35 | 26.20 | 26.32 | 38.74 | |||||||||||||
| 1970 | 27.90 | 27.46 | 30.16 | 32.80 | 43.87 | 55.17 | 58.65 | 54.61 | 42.30 | 33.39 | 31.30 | 23.06 | 38.39 | |||||||||||||
| 1971 | 26.48 | 26.54 | 27.71 | 36.83 | 47.26 | 51.60 | 57.97 | 59.39 | 40.67 | 34.65 | 29.30 | 22.84 | 38.44 | |||||||||||||
| 1972 | 20.32 | 23.03 | 32.65 | 36.93 | 45.29 | 54.60 | 55.00 | 57.74 | 43.07 | 38.74 | 31.37 | 14.23 | 37.75 | |||||||||||||
| 1973 | 23.42 | 28.50 | 32.84 | 38.57 | 46.39 | 52.83 | 59.86 | b | 56.19 | 46.53 | 35.87 | 33.00 | 29.19 | 40.27 | ||||||||||||
| 1974 | 20.10 | 28.32 | 32.10 | 37.80 | 43.74 | 55.73 | 59.00 | 56.10 | 45.63 | 37.16 | 30.63 | 23.48 | 39.15 | |||||||||||||
| 1975 | 17.23 | 26.86 | 30.97 | 34.63 | 43.65 | 52.37 | 63.39 | 54.29 | 45.90 | 38.16 | 27.03 | 23.45 | 38.16 | |||||||||||||
| 1976 | 18.71 | 22.17 | 26.35 | 36.53 | 45.39 | 50.27 | 58.48 | 54.00 | 48.80 | 34.45 | 27.10 | 17.68 | 36.66 | |||||||||||||
| 1977 | 12.87 | 22.00 | 30.10 | 39.33 | 43.58 | 59.67 | 57.84 | 58.87 | 47.57 | 37.52 | 28.97 | 30.45 | 39.06 | |||||||||||||
| 1978 | 28.26 | 31.36 | 34.94 | 39.77 | 45.29 | 52.83 | 59.32 | 55.39 | 47.30 | 35.32 | 23.87 | 17.58 | 39.27 | |||||||||||||
| 1979 | 5.77 | 24.50 | 32.52 | 37.87 | 47.87 | 53.37 | 59.61 | 59.10 | 49.50 | 41.03 | 24.77 | 25.19 | 38.42 | |||||||||||||
| 1980 | 23.13 | 31.86 | 31.87 | 40.97 | 47.13 | 50.90 | 58.19 | 54.58 | 47.03 | 35.42 | 27.73 | 25.42 | 39.52 | |||||||||||||
| 1981 | 29.58 | 26.07 | 32.16 | 40.03 | 46.10 | 51.37 | 56.90 | 58.84 | 48.20 | 35.45 | 34.30 | 26.35 | 40.45 | |||||||||||||
| 1982 | 14.80 | a | 19.89 | 32.45 | 34.70 | 43.68 | 54.50 | 58.26 | 57.84 | 47.90 | 38.13 | 25.70 | 23.87 | 37.64 | ||||||||||||
| 1983 | 24.26 | 32.21 | 37.00 | 36.67 | 46.65 | 52.77 | 56.13 | 59.61 | 44.57 | 38.55 | 36.10 | 19.39 | 40.32 | |||||||||||||
| 1984 | 17.68 | 22.45 | 33.26 | 38.67 | 44.29 | 51.63 | 60.26 | 59.65 | 44.83 | 35.19 | 32.30 | 14.68 | 37.91 | |||||||||||||
| 1985 | 9.77 | 17.82 | 28.68 | 40.20 | 47.13 | 53.93 | 63.29 | 53.29 | 43.13 | 34.39 | 20.60 | 7.42 | 34.97 | |||||||||||||
| 1986 | 16.23 | 30.36 | 37.10 | 39.00 | 46.23 | 58.67 | 57.26 | 59.87 | 46.73 | 37.10 | 30.33 | 20.94 | 39.98 | |||||||||||||
| 1987 | 18.13 | 28.54 | 34.03 | 41.53 | 50.94 | 55.43 | 57.35 | 55.42 | 47.83 | 35.39 | 31.27 | 25.32 | 40.10 | |||||||||||||
| 1988 | 16.94 | 25.34 | 32.32 | 39.67 | 45.19 | 57.77 | 61.06 | 55.97 | 46.00 | 42.45 | 33.37 | 20.55 | 39.72 | |||||||||||||
| 1989 | 11.10 | 8.43 | 33.26 | 40.43 | 44.81 | 55.87 | 60.84 | 56.65 | 47.83 | 38.48 | 27.13 | 20.45 | 37.11 | |||||||||||||
| 1990 | 26.74 | 23.54 | 32.61 | 43.20 | 46.48 | 54.30 | 61.65 | 59.35 | 53.97 | 36.68 | 29.03 | 10.23 | 39.81 | |||||||||||||
| 1991 | 16.13 | 29.75 | 32.90 | 39.30 | 45.84 | 51.67 | 61.58 | 60.23 | 49.50 | 37.77 | 30.70 | 23.68 | 39.92 | |||||||||||||
| 1992 | 24.71 | 30.83 | 35.13 | 41.17 | 49.03 | 57.87 | 57.55 | 58.55 | 46.20 | 39.84 | 29.70 | 20.35 | 40.91 | |||||||||||||
| 1993 | 18.06 | 19.11 | 32.65 | 38.60 | 50.13 | 50.87 | 54.00 | 53.52 | 46.33 | 39.32 | 19.33 | 26.87 | 37.40 | |||||||||||||
| 1994 | 28.23 | 23.82 | 32.39 | 40.57 | 48.77 | 53.53 | 62.58 | 60.52 | 49.97 | 37.23 | 24.03 | 21.42 | 40.25 | |||||||||||||
| 1995 | 27.19 | 31.25 | 34.39 | 38.47 | 47.68 | 52.17 | 60.03 | 53.74 | 48.90 | 34.71 | 33.43 | 26.68 | 40.72 | |||||||||||||
| 1996 | 26.26 | 26.00 | 35.13 | 37.87 | 46.10 | 53.23 | 61.45 | 55.77 | 46.10 | 38.23 | 31.50 | 26.74 | 40.36 | |||||||||||||
| 1997 | 24.68 | 28.29 | 32.61 | 38.03 | 49.00 | 54.97 | 59.29 | 58.13 | 51.27 | 36.52 | 30.33 | 23.87 | 40.58 | |||||||||||||
| 1998 | 28.13 | 30.93 | 34.06 | 39.57 | 47.23 | 51.93 | 64.55 | 59.71 | 53.97 | 37.84 | 34.63 | 22.32 | 42.07 | |||||||||||||
| 1999 | 28.32 | 28.21 | 31.68 | 35.50 | 45.03 | 52.60 | 57.13 | 58.31 | b | 45.07 | 35.16 | 31.50 | 25.48 | 39.50 | ||||||||||||
| 2000 | 26.03 | 29.66 | 31.71 | 40.23 | 46.80 | a | 53.23 | 60.03 | 56.42 | 43.73 | 36.26 | 23.23 | 23.10 | 39.20 | ||||||||||||
| 2001 | 19.52 | 21.39 | 31.67 | a | 34.80 | 44.71 | 51.28 | a | 58.42 | 56.19 | 45.86 | a | 32.74 | 27.77 | 21.10 | 37.12 | ||||||||||
| 2002 | 23.45 | 22.43 | 29.84 | 39.87 | 45.14 | b | 55.93 | a | 62.63 | a | 52.50 | a | 44.93 | 31.00 | 21.53 | 25.42 | 37.89 | |||||||||
| 2003 | 26.26 | 23.29 | 31.97 | 35.60 | 42.55 | 51.93 | 59.77 | 55.13 | 41.13 | 34.45 | 24.30 | 30.16 | 38.05 | |||||||||||||
| 2004 | 21.74 | 26.38 | 35.06 | 40.60 | 46.52 | 54.87 | 61.71 | 58.48 | 47.63 | 40.26 | 30.03 | 26.81 | 40.84 | |||||||||||||
| 2005 | 25.35 | 21.79 | 31.23 | 36.27 | 46.15 | k | 50.55 | h | 59.11 | l | 58.91 | h | 43.40 | j | 36.33 | j | 26.58 | k | 16.05 | l | 28.66 | |||||
| 2006 | 26.57 | j | 23.95 | i | 31.76 | j | 37.60 | j | 46.05 | j | 56.29 | i | 63.16 | l | 54.00 | h | 44.32 | k | 32.81 | j | 26.25 | j | 17.06 | o | 9999.00 | |
| 2007 | 15.09 | i | 25.21 | i | 30.23 | i | 33.90 | i | 44.90 | j | 50.95 | j | 61.80 | k | 51.00 | i | 40.79 | k | 36.74 | h | 26.70 | j | 29.94 | n | 9999.00 | |
| 2008 | 16.27 | i | 25.70 | i | 28.90 | j | 30.23 | h | 44.50 | k | 50.67 | i | 57.81 | j | 54.00 | l | 39.90 | j | 31.09 | h | 32.50 | l | 19.37 | l | 9999.00 | |
| 2009 | 23.00 | k | 25.21 | i | 28.73 | i | 37.00 | i | 43.28 | m | 45.59 | h | 48.55 | k | 57.81 | j | 49.20 | j | 34.05 | k | 23.68 | k | 15.95 | j | 9999.00 | |
| 2010 | 27.69 | o | 27.27 | m | 30.22 | h | 35.93 | 43.13 | 52.40 | 59.84 | 57.23 | 48.13 | 42.42 | 29.53 | 22.48 | 43.46 | ||||||||||
| 2011 | 21.39 | 25.82 | 34.55 | 35.52 | a | 43.71 | 51.45 | a | 59.94 | 60.55 | 51.89 | b | 40.67 | a | 28.07 | 17.84 | 39.28 | |||||||||
| 2012 | 24.23 | 25.96 | a | 34.10 | 41.86 | b | 46.24 | b | 51.33 | f | 64.33 | a | 59.45 | b | 48.66 | a | 35.74 | 33.03 | a | 26.73 | a | 40.03 | ||||
| 2013 | 8.18 | c | 27.44 | a | 31.10 | b | 34.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.24 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 20.94 | 25.39 | 31.59 | 38.25 | 46.16 | 53.08 | 59.24 | 56.63 | 46.77 | 36.72 | 28.98 | 23.62 | 39.01 | |||||||||||||
| S.D. | 6.48 | 4.50 | 2.49 | 2.19 | 2.09 | 2.18 | 2.24 | 2.13 | 2.80 | 2.52 | 3.71 | 4.52 | 1.34 | |||||||||||||
| SKEW | -0.88 | -1.00 | -0.40 | -0.09 | 0.32 | 0.77 | 0.18 | 0.17 | 0.44 | 0.30 | -0.66 | -1.19 | -0.22 | |||||||||||||
| MAX | 31.33 | 32.21 | 37.10 | 43.20 | 50.94 | 59.67 | 64.55 | 60.55 | 53.97 | 42.45 | 36.10 | 31.61 | 42.07 | |||||||||||||
| MIN | 0.03 | 8.43 | 24.48 | 32.80 | 42.32 | 48.04 | 54.00 | 52.50 | 40.67 | 31.00 | 19.33 | 7.42 | 34.97 | |||||||||||||
| NO YRS | 66 | 66 | 65 | 65 | 61 | 63 | 64 | 63 | 64 | 65 | 67 | 67 | 57 | |||||||||||||