| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.03 | ----- | z | 47.94 | ----- | z | 23.29 | ----- | z | 14.68 | 33.23 | |||||
| 1930 | -9.58 | 19.39 | 15.97 | 23.40 | 25.52 | d | 40.90 | i | 49.61 | 48.71 | 38.23 | 25.87 | 16.07 | 8.48 | 23.79 | |||||||||||
| 1931 | 14.74 | 21.93 | 26.52 | 28.03 | 35.10 | 44.70 | 50.29 | 45.29 | 35.43 | 28.26 | 14.80 | 10.26 | 29.61 | |||||||||||||
| 1932 | 10.84 | 3.52 | 27.39 | 30.80 | 36.77 | 42.70 | 45.84 | 41.23 | 33.93 | 26.74 | 22.00 | 5.06 | 27.24 | |||||||||||||
| 1933 | 9.19 | 2.71 | 23.03 | 26.10 | 32.55 | 43.80 | 47.71 | 43.71 | 33.40 | 27.03 | 18.33 | 26.65 | 27.85 | |||||||||||||
| 1934 | 24.65 | 24.54 | 28.84 | 29.90 | 36.84 | 39.23 | 45.10 | 42.97 | 31.60 | 29.19 | 27.50 | 15.48 | 31.32 | |||||||||||||
| 1935 | 11.71 | 12.32 | 20.58 | 29.77 | 33.26 | 38.87 | 43.97 | 40.87 | 33.93 | 27.10 | 18.87 | 18.81 | 27.50 | |||||||||||||
| 1936 | 16.26 | 19.00 | a | 24.52 | 34.33 | 37.55 | 46.13 | 49.33 | a | 47.65 | 32.93 | 24.84 | 9.97 | 16.74 | 29.94 | |||||||||||
| 1937 | -5.06 | 11.79 | 25.35 | 30.80 | 37.06 | 40.90 | 48.26 | 41.00 | 35.63 | 27.42 | 27.57 | 23.19 | 28.66 | |||||||||||||
| 1938 | 18.13 | 23.25 | 24.29 | 31.53 | 34.90 | 41.70 | 49.94 | 44.06 | 39.93 | 31.45 | 19.23 | 18.45 | 31.41 | |||||||||||||
| 1939 | 19.77 | a | 10.96 | 24.06 | 29.63 | 36.26 | 39.10 | 48.65 | ----- | z | 36.60 | 28.52 | 17.13 | 24.29 | 28.63 | |||||||||||
| 1940 | 21.13 | 25.79 | 26.45 | 30.67 | 36.03 | 42.97 | 47.45 | 44.19 | 40.20 | 31.58 | 18.07 | 24.10 | 32.39 | |||||||||||||
| 1941 | 18.29 | 26.61 | 25.87 | 30.07 | 40.35 | 44.00 | 50.13 | 47.42 | 34.10 | 30.65 | 26.67 | 23.94 | 33.17 | |||||||||||||
| 1942 | 7.71 | 16.96 | 23.61 | 31.73 | 35.52 | 39.73 | 48.68 | 43.71 | 35.53 | 29.13 | 25.43 | 24.10 | 30.15 | |||||||||||||
| 1943 | 17.32 | 23.36 | 26.23 | 34.40 | 34.23 | 40.53 | 46.00 | 44.16 | 38.07 | 33.97 | 22.50 | 17.94 | 31.56 | |||||||||||||
| 1944 | 9.81 | 22.03 | 22.52 | 29.80 | 34.45 | 41.90 | 44.97 | 41.87 | 36.17 | 29.42 | 20.80 | 19.13 | 29.41 | |||||||||||||
| 1945 | 17.43 | a | 26.57 | 24.26 | 27.77 | 37.65 | 40.70 | 47.32 | 45.23 | 34.70 | 32.32 | 24.57 | 20.19 | 31.56 | ||||||||||||
| 1946 | 14.77 | 19.11 | 28.06 | 30.93 | 34.35 | 40.30 | 47.42 | 44.19 | 31.17 | 24.35 | 20.53 | 20.32 | 29.63 | |||||||||||||
| 1947 | 4.74 | 21.79 | 24.39 | 29.07 | 38.74 | 44.31 | a | 45.42 | 43.35 | 35.90 | 34.48 | 23.20 | 16.29 | 30.14 | ||||||||||||
| 1948 | 17.77 | 18.10 | 21.23 | 27.30 | 34.77 | 42.77 | 43.84 | 41.13 | 34.07 | 25.13 | 21.03 | 10.23 | 28.11 | |||||||||||||
| 1949 | -10.52 | 14.56 | a | 25.19 | 27.97 | 39.06 | 45.33 | 45.70 | a | 43.84 | 37.63 | 25.35 | 21.80 | 11.10 | 27.25 | |||||||||||
| 1950 | 9.07 | a | 24.96 | 22.55 | 25.93 | 31.03 | 41.34 | a | 47.19 | 44.32 | 40.37 | 33.10 | 27.40 | 25.55 | 31.07 | |||||||||||
| 1951 | 13.13 | 24.07 | 19.81 | 28.20 | 37.10 | 36.23 | 48.16 | 45.07 | a | 35.30 | 29.00 | 21.60 | 14.71 | 29.36 | ||||||||||||
| 1952 | 14.35 | 12.69 | 20.07 | b | 31.17 | 35.74 | 41.53 | 47.10 | 43.42 | 36.77 | 26.00 | 12.03 | a | 22.45 | 28.61 | |||||||||||
| 1953 | 29.42 | 22.86 | 23.71 | 26.67 | 35.61 | c | 40.83 | a | 44.26 | 46.61 | 36.50 | 28.10 | 27.97 | 20.03 | 31.88 | |||||||||||
| 1954 | 23.39 | 25.11 | 21.03 | 30.97 | 37.74 | 40.63 | 46.90 | 40.32 | 31.37 | 24.43 | a | 21.80 | 10.33 | a | 29.50 | |||||||||||
| 1955 | 4.52 | 8.96 | 19.48 | 26.73 | 33.97 | 42.07 | 46.74 | 43.39 | 33.70 | 28.16 | 22.20 | 25.10 | 27.92 | |||||||||||||
| 1956 | 22.16 | 15.45 | 25.13 | 30.89 | b | 41.38 | b | 42.43 | 48.71 | 41.90 | 31.24 | a | 28.87 | 13.50 | p | 15.00 | a | 31.20 | ||||||||
| 1957 | 6.90 | a | 19.77 | b | 28.79 | b | 30.79 | a | 39.13 | 43.93 | a | 45.19 | 42.65 | 36.75 | b | 31.40 | f | 20.20 | 20.84 | 30.45 | ||||||
| 1958 | 16.81 | 30.33 | a | 23.14 | b | 30.33 | 39.66 | b | 46.77 | 48.16 | 49.70 | a | 36.54 | b | 28.58 | 21.87 | 23.29 | 32.93 | ||||||||
| 1959 | 21.90 | 21.00 | 23.35 | 28.90 | 33.35 | 45.03 | 48.87 | 44.10 | k | 39.23 | 31.77 | 16.53 | 10.10 | 29.10 | ||||||||||||
| 1960 | 9.55 | 19.45 | 26.71 | 29.57 | 35.71 | 43.47 | 51.26 | 42.55 | 38.27 | 27.90 | 25.63 | 15.97 | 30.50 | |||||||||||||
| 1961 | 17.65 | 28.57 | 27.81 | 26.47 | 36.00 | 48.63 | 49.26 | 53.52 | 35.47 | 29.68 | 18.97 | 17.39 | 32.45 | |||||||||||||
| 1962 | 6.64 | c | 18.50 | 22.77 | 31.63 | 36.93 | a | 42.72 | e | 45.77 | 45.27 | a | 39.41 | a | 29.90 | 24.46 | d | 23.03 | 30.59 | |||||||
| 1963 | 11.96 | e | 28.04 | d | 25.07 | a | 27.13 | 39.32 | 43.12 | d | 43.90 | 45.16 | 43.52 | i | 35.86 | i | 28.22 | c | 19.31 | b | 31.12 | |||||
| 1964 | 14.42 | 14.03 | 22.43 | h | 23.97 | 31.71 | 42.97 | 46.87 | 44.78 | d | 32.00 | 26.00 | c | 21.53 | 19.31 | e | 28.87 | |||||||||
| 1965 | 18.93 | b | 24.18 | 17.68 | 32.04 | c | 31.00 | b | 41.07 | 46.11 | c | 45.29 | 31.79 | b | 26.77 | 23.26 | c | 14.11 | c | 29.35 | ||||||
| 1966 | 14.65 | 16.33 | a | 23.13 | a | 26.63 | c | 35.18 | i | 40.04 | g | 44.32 | 44.39 | 40.64 | h | 23.65 | e | 25.68 | e | 20.93 | d | 26.63 | ||||
| 1967 | 22.17 | b | 25.70 | a | 23.61 | h | 27.42 | d | 33.46 | g | 45.41 | a | 52.68 | 51.03 | 42.77 | 26.18 | n | 24.79 | f | 12.73 | e | 34.99 | ||||
| 1968 | 15.52 | d | 27.57 | a | 24.54 | e | 25.07 | c | 34.25 | o | 42.96 | c | 50.47 | l | 46.21 | c | 37.57 | b | 28.70 | a | 29.95 | i | 16.41 | n | 31.02 | |
| 1969 | 21.74 | 23.77 | f | 22.13 | h | 28.21 | p | 35.53 | n | 46.19 | d | 48.83 | a | 45.54 | e | ----- | z | 25.11 | c | 17.26 | k | 20.37 | l | 37.48 | ||
| 1970 | 23.08 | g | 24.62 | d | 22.81 | o | 23.96 | g | 32.68 | l | 44.93 | c | 49.17 | b | 46.14 | q | 33.72 | l | 25.11 | m | 26.33 | l | 15.91 | i | 39.57 | |
| 1971 | 18.83 | g | 19.50 | n | ----- | z | 28.87 | o | 36.60 | p | 42.25 | f | 49.23 | i | 50.26 | h | 32.14 | i | 26.06 | n | 21.95 | k | 13.05 | j | 9999.00 | |
| 1972 | 13.38 | g | ----- | z | 26.83 | h | 27.54 | f | 38.23 | a | 43.83 | a | 44.65 | e | 45.11 | d | 33.85 | d | 26.86 | b | 24.96 | c | 9.67 | a | 33.40 | |
| 1973 | 12.19 | e | 21.31 | b | 23.88 | f | 24.93 | c | 35.50 | e | 43.03 | a | 46.70 | a | 43.50 | c | 37.38 | a | 27.73 | i | 24.50 | h | 23.41 | n | 33.07 | |
| 1974 | 12.67 | g | 21.24 | k | 23.26 | h | 27.83 | g | 33.17 | b | 45.28 | a | 48.28 | b | 45.77 | e | 34.93 | b | 26.93 | d | 22.90 | i | 15.96 | h | 39.06 | |
| 1975 | 6.25 | o | 22.72 | j | 26.08 | r | 24.91 | g | 33.21 | l | 42.80 | j | 53.87 | a | 45.43 | j | 37.70 | c | 34.95 | l | 22.23 | h | 21.52 | j | 45.79 | |
| 1976 | 17.18 | n | 22.43 | o | 17.25 | k | 28.72 | e | 36.25 | g | 41.29 | b | 49.31 | b | 45.50 | c | 40.89 | k | 21.54 | r | 17.89 | l | 9.43 | h | 41.20 | |
| 1977 | 6.96 | d | 18.16 | i | 20.61 | m | 29.19 | i | 34.12 | g | 49.00 | a | 51.28 | f | 50.75 | g | 39.59 | c | 29.33 | d | 24.35 | g | 26.42 | g | 31.22 | |
| 1978 | 24.36 | c | 24.14 | f | 29.77 | i | 30.65 | d | 35.31 | e | 39.52 | c | 50.10 | 47.20 | f | 38.07 | a | 26.04 | c | 17.22 | l | 12.80 | a | 32.10 | ||
| 1979 | 2.52 | f | 24.35 | h | 26.25 | g | 30.56 | c | 37.04 | e | 43.54 | b | 50.19 | d | 49.69 | b | 38.75 | b | 32.93 | d | 17.23 | 20.14 | i | 37.49 | ||
| 1980 | 18.81 | e | 29.00 | k | 23.18 | i | 28.10 | i | 36.59 | d | 38.32 | e | 48.53 | a | 43.55 | b | 39.74 | c | 26.43 | a | 23.00 | b | 15.46 | c | 32.27 | |
| 1981 | 21.04 | h | 18.83 | e | 19.64 | q | ----- | z | ----- | z | 39.29 | m | 45.35 | 45.14 | c | 35.70 | j | 24.64 | f | 24.74 | c | 22.38 | g | 33.52 | ||
| 1982 | 11.10 | a | 16.12 | b | 22.23 | 25.47 | 33.16 | 44.77 | 48.97 | 45.76 | b | 38.43 | 29.20 | k | 15.19 | i | 19.06 | 30.51 | ||||||||
| 1983 | 24.16 | 29.93 | 31.65 | 28.00 | b | 36.94 | 42.70 | 47.58 | 50.94 | 37.33 | 30.25 | k | 27.55 | j | 13.00 | n | 36.58 | |||||||||
| 1984 | 0.30 | k | 11.89 | t | 23.00 | z | 32.80 | o | 38.76 | j | 43.67 | 53.94 | 50.24 | n | 37.00 | 27.87 | p | 29.25 | n | 11.48 | 36.52 | |||||
| 1985 | 7.61 | 17.40 | m | 22.00 | j | 31.20 | 37.81 | 42.03 | 53.13 | 43.26 | l | 32.62 | f | 26.45 | 13.20 | 2.27 | p | 30.20 | ||||||||
| 1986 | 21.53 | p | 26.00 | t | 30.35 | k | 29.30 | 36.30 | k | 45.87 | 45.50 | a | 50.32 | 38.23 | 26.45 | i | 25.58 | r | 15.39 | 37.43 | ||||||
| 1987 | 11.77 | 24.29 | 29.13 | 30.80 | 39.84 | 44.57 | 44.35 | 41.77 | 34.40 | 25.97 | 23.13 | 16.37 | a | 30.53 | ||||||||||||
| 1988 | 11.62 | b | 20.59 | 25.29 | 28.70 | 35.13 | 45.69 | a | 47.29 | 40.32 | 33.60 | o | 29.09 | t | 22.47 | o | ----- | z | 31.83 | |||||||
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | 17.87 | ----- | z | 47.97 | 44.52 | 37.40 | 26.23 | 15.15 | d | 9.81 | 28.42 | |||||||
| 1990 | 5.61 | ----- | z | 18.10 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.40 | 4.10 | 12.05 | |||||
| 1991 | ----- | z | 21.61 | ----- | z | 27.60 | 35.00 | 40.29 | p | ----- | z | ----- | z | ----- | z | ----- | z | 24.57 | ----- | z | 27.19 | |||||
| 1992 | ----- | z | ----- | z | 22.50 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.84 | 20.84 | ||
| 1994 | 21.58 | 17.50 | 23.45 | 31.37 | 41.19 | 43.57 | 49.06 | 45.10 | 38.07 | 29.26 | 19.73 | 16.94 | 31.40 | |||||||||||||
| 1995 | 27.97 | 26.04 | 29.71 | 32.23 | 40.42 | 42.07 | 47.58 | 42.65 | 40.07 | 27.87 | 29.27 | 23.97 | 34.15 | |||||||||||||
| 1996 | 22.61 | 19.34 | 27.10 | 31.83 | 38.68 | 44.23 | 49.90 | 47.61 | 36.20 | 31.16 | 25.73 | 25.53 | a | 33.33 | ||||||||||||
| 1997 | 21.26 | 22.32 | 26.26 | 30.13 | 40.35 | 44.90 | 48.65 | 47.32 | 41.70 | 27.55 | 26.00 | 16.81 | 32.77 | |||||||||||||
| 1998 | 27.94 | 26.57 | 28.23 | 30.90 | 38.65 | 42.43 | ----- | z | 47.77 | 43.77 | 26.81 | 27.70 | 14.61 | 32.31 | ||||||||||||
| 1999 | 19.65 | 22.61 | 24.42 | 27.53 | 33.32 | 43.20 | 43.45 | 47.45 | 34.00 | 26.32 | 25.80 | 16.43 | a | 30.35 | ||||||||||||
| 2000 | 22.00 | a | 28.64 | a | 24.70 | a | 33.76 | a | 39.87 | 43.48 | g | ----- | z | 45.55 | 36.83 | 30.53 | a | 19.37 | 17.93 | a | 29.92 | |||||
| 2001 | 8.03 | 17.67 | a | 29.31 | e | 28.87 | 38.17 | b | 43.73 | 50.86 | j | 47.39 | h | 37.30 | 28.79 | c | 22.80 | 19.77 | 27.44 | |||||||
| 2002 | 19.52 | ----- | z | 23.87 | 30.37 | 36.10 | 45.60 | 51.35 | 41.41 | i | ----- | z | 20.32 | 18.90 | 20.58 | 29.62 | ||||||||||
| 2003 | 26.65 | 19.89 | 27.74 | 28.77 | ----- | z | ----- | z | ----- | z | 45.77 | ----- | z | ----- | z | 19.10 | 22.87 | 27.26 | ||||||||
| 2004 | 16.71 | 16.76 | 25.23 | 29.37 | 36.39 | ----- | z | ----- | z | ----- | z | ----- | z | 30.00 | t | 20.07 | 18.48 | 23.29 | ||||||||
| 2005 | 16.87 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.87 | ||
| 2006 | ----- | z | 20.18 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.18 | ||
| 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 | 27.13 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.37 | 21.48 | 22.99 | ||||
| 2011 | 15.87 | 20.37 | a | 29.06 | 28.29 | b | 33.65 | 40.93 | 48.03 | 50.10 | a | 41.77 | 30.70 | a | 21.07 | a | 11.58 | 30.95 | ||||||||
| 2012 | 17.86 | b | 21.62 | 27.89 | c | 31.53 | 34.40 | a | 39.72 | a | 52.87 | a | 48.55 | b | 37.11 | b | 27.07 | b | 25.30 | g | 21.74 | 32.76 | ||||
| 2013 | 9.40 | f | 21.81 | a | 23.48 | b | 28.00 | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.65 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 15.04 | 20.50 | 24.69 | 29.29 | 35.89 | 42.96 | 47.87 | 45.22 | 36.62 | 28.02 | 21.68 | 17.51 | 30.40 | |||||||||||||
| S.D. | 8.09 | 5.79 | 3.21 | 2.38 | 3.69 | 2.46 | 2.51 | 2.86 | 2.89 | 2.76 | 4.24 | 5.27 | 1.83 | |||||||||||||
| SKEW | -0.95 | -0.88 | -0.40 | -0.29 | -2.15 | -0.06 | 0.39 | 0.58 | 0.09 | 0.12 | -0.46 | -0.42 | 0.03 | |||||||||||||
| MAX | 29.42 | 30.33 | 31.65 | 34.40 | 41.38 | 49.00 | 53.94 | 53.52 | 43.77 | 34.48 | 29.27 | 26.65 | 34.15 | |||||||||||||
| MIN | -10.52 | 2.71 | 15.97 | 23.40 | 17.87 | 36.23 | 43.45 | 40.32 | 31.17 | 20.32 | 9.97 | 4.10 | 27.24 | |||||||||||||
| NO YRS | 64 | 61 | 57 | 63 | 61 | 65 | 65 | 62 | 61 | 58 | 58 | 63 | 36 | |||||||||||||