YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | 23.75 | 37.35 | 48.28 | a | 51.26 | 60.37 | 64.84 | 61.32 | 55.50 | 41.45 | 33.83 | a | 27.55 | 45.95 | a | |||||||||
1940 | 22.32 | 29.72 | 35.58 | 40.03 | 50.26 | 58.20 | 62.00 | 59.42 | 55.40 | 42.52 | 29.43 | 28.97 | 42.82 | |||||||||||||
1941 | 28.19 | 32.93 | 33.52 | 38.37 | 53.84 | 57.23 | 64.42 | 62.29 | 59.70 | 48.65 | 35.57 | 28.84 | 45.29 | |||||||||||||
1942 | 27.48 | 28.00 | 32.10 | 43.07 | 48.06 | 58.50 | 63.97 | a | 64.52 | 54.45 | a | 45.52 | 35.47 | 29.58 | 44.23 | |||||||||||
1943 | 27.23 | 29.96 | 35.32 | 45.47 | 56.52 | 60.70 | 64.39 | 67.71 | 55.53 | 42.69 | b | 31.17 | 28.27 | a | 45.41 | |||||||||||
1944 | 21.71 | 32.21 | 33.68 | 40.47 | 52.00 | 57.57 | 63.68 | 61.71 | 53.10 | 44.23 | 31.53 | 21.53 | a | 42.78 | ||||||||||||
1945 | 23.55 | 26.50 | 32.10 | 40.31 | a | 48.63 | a | 53.27 | 63.10 | 61.35 | 53.27 | 45.29 | 29.83 | 26.37 | a | 41.96 | ||||||||||
1946 | 26.35 | 25.79 | 37.29 | 46.50 | 50.45 | 60.50 | 63.58 | 65.74 | 61.00 | ----- | z | 30.43 | b | 29.84 | 45.22 | a | ||||||||||
1947 | 24.94 | 29.04 | 36.87 | 39.57 | 51.68 | 59.57 | ----- | z | 64.52 | 54.83 | 47.21 | g | 30.53 | 21.70 | a | 41.32 | b | |||||||||
1948 | 22.28 | b | 28.89 | b | 32.13 | a | 44.50 | 51.90 | a | 62.27 | 64.10 | 62.03 | 56.50 | 45.74 | 24.97 | 31.00 | a | 43.86 | ||||||||
1949 | 24.60 | a | 29.21 | 35.97 | 43.17 | 51.35 | 61.53 | 66.29 | 62.48 | 60.10 | 45.87 | 34.10 | 26.23 | a | 45.08 | |||||||||||
1950 | 31.35 | 34.36 | 38.52 | 46.80 | 51.13 | 62.73 | 65.42 | 60.61 | 56.40 | 49.39 | 30.93 | a | 28.84 | 46.37 | ||||||||||||
1951 | 25.19 | 29.26 | a | 37.84 | 44.23 | 51.87 | 58.43 | 68.26 | 66.16 | 56.83 | 48.42 | 33.53 | 32.29 | 46.03 | ||||||||||||
1952 | 33.16 | 30.83 | 34.61 | 47.37 | 53.77 | 64.30 | 64.13 | 65.52 | 56.21 | a | 40.97 | 32.20 | 25.23 | 45.69 | ||||||||||||
1953 | 29.10 | 30.89 | 40.06 | 48.00 | 49.48 | 62.87 | 66.94 | 63.48 | 51.47 | 42.14 | b | 32.87 | 19.61 | 44.74 | ||||||||||||
1954 | 25.58 | 31.79 | 37.42 | 48.27 | 54.29 | 59.83 | 66.26 | 64.45 | 60.10 | 48.32 | 32.83 | 25.87 | 46.25 | |||||||||||||
1955 | 26.13 | a | 26.15 | b | 38.63 | d | 45.20 | 54.07 | d | 60.66 | a | 64.06 | 64.48 | 56.77 | 46.26 | 35.17 | 29.32 | 45.58 | ||||||||
1956 | 29.90 | 27.72 | 36.00 | 42.57 | 52.26 | 65.20 | 65.26 | 61.06 | 53.90 | 44.65 | 28.20 | 25.13 | 44.32 | |||||||||||||
1957 | 31.58 | 38.68 | 40.26 | 43.83 | 53.29 | 63.43 | 69.10 | 67.00 | 56.03 | 49.06 | 34.50 | 27.65 | 47.87 | |||||||||||||
1958 | 27.26 | 34.86 | 37.81 | 45.17 | 54.77 | 66.17 | 66.81 | 64.23 | 59.87 | 49.97 | 35.50 | 27.23 | 47.47 | |||||||||||||
1959 | 27.13 | 32.46 | 33.06 | 46.10 | 51.19 | 62.73 | 64.00 | 63.45 | 55.07 | 44.74 | 32.93 | 29.55 | 45.20 | |||||||||||||
1960 | 25.23 | 27.59 | 38.26 | 44.70 | 51.10 | 63.37 | 66.23 | 65.19 | 58.10 | 44.84 | 33.23 | 25.39 | 45.27 | |||||||||||||
1961 | 25.87 | 28.36 | 37.26 | 42.73 | 51.90 | 60.00 | 65.87 | 64.10 | 58.63 | 43.61 | 32.77 | 29.81 | 45.08 | |||||||||||||
1962 | 24.63 | a | 34.21 | 33.39 | 50.13 | 53.65 | 60.47 | 67.29 | 65.29 | 61.53 | 48.32 | 37.73 | 30.77 | 47.29 | ||||||||||||
1963 | 23.00 | 31.79 | 37.84 | 47.30 | 55.26 | 61.43 | 69.74 | 66.10 | 61.07 | 48.39 | 36.63 | 24.71 | 46.94 | |||||||||||||
1964 | 21.55 | 23.34 | 35.35 | 44.50 | 54.48 | 61.13 | 68.13 | 65.97 | 59.03 | 44.71 | 33.43 | 29.29 | 45.08 | |||||||||||||
1965 | 32.52 | 30.39 | 35.39 | 45.57 | 52.58 | 59.30 | 67.32 | 65.29 | 58.83 | 42.87 | 39.63 | 31.19 | 46.74 | |||||||||||||
1966 | 24.19 | 26.46 | 37.61 | 47.13 | 56.19 | 61.63 | 68.10 | 63.29 | 57.10 | 41.68 | 34.37 | 22.19 | 45.00 | |||||||||||||
1967 | 19.29 | 28.67 | a | 37.06 | 42.21 | b | 47.90 | 61.37 | 67.06 | 64.47 | a | 58.30 | 43.45 | 37.80 | 28.00 | 44.63 | ||||||||||
1968 | 29.10 | 36.52 | 38.65 | 44.76 | a | 53.97 | 62.00 | 64.29 | 64.23 | 54.83 | a | 46.17 | a | 36.50 | d | 24.41 | d | 46.28 | ||||||||
1969 | 31.81 | 31.29 | 33.20 | a | 46.72 | a | 53.37 | a | 62.00 | 68.00 | a | 67.74 | 58.03 | 46.93 | b | 34.07 | c | 31.41 | b | 47.05 | ||||||
1970 | 26.33 | a | 32.86 | 37.26 | 43.73 | 51.77 | a | 61.96 | b | 67.06 | 65.35 | 60.17 | a | 41.64 | c | 33.00 | c | 30.72 | b | 45.99 | ||||||
1971 | 26.47 | a | 29.59 | a | 37.48 | b | 43.47 | 51.32 | 62.63 | 67.65 | 63.80 | a | 58.38 | a | 46.44 | d | 36.21 | b | ----- | z | 47.59 | a | ||||
1972 | 27.33 | a | 29.75 | a | 43.50 | e | 44.80 | e | 52.07 | c | 63.18 | b | 66.79 | b | 64.25 | c | 59.92 | d | 50.04 | d | 30.52 | g | 26.94 | 48.05 | a | |
1973 | 25.52 | b | 31.12 | c | 37.77 | 40.89 | b | 53.19 | 60.41 | a | 66.57 | a | 62.32 | 58.03 | a | 43.67 | d | 33.88 | f | 26.15 | e | 45.97 | a | |||
1974 | 27.54 | c | 25.42 | d | 40.72 | b | 47.76 | a | 57.03 | b | 64.60 | 67.06 | 64.74 | 57.10 | 51.00 | 36.37 | 27.23 | a | 47.21 | |||||||
1975 | 28.65 | 32.18 | 36.23 | 39.87 | 49.58 | 60.33 | 65.23 | 65.03 | 56.80 | 45.00 | c | 32.84 | e | 26.89 | c | 44.89 | ||||||||||
1976 | 27.13 | 35.36 | a | 39.32 | 45.30 | 53.03 | 62.86 | a | 65.71 | 64.87 | 58.63 | 41.80 | k | 31.52 | i | 25.10 | 47.73 | b | ||||||||
1977 | 27.22 | d | 31.04 | a | 36.42 | 47.36 | b | 54.39 | 65.37 | 67.27 | a | 68.74 | 61.41 | c | 49.77 | 36.07 | 31.81 | 48.07 | ||||||||
1978 | 29.97 | 32.54 | 41.58 | 46.63 | 54.68 | 65.17 | 68.87 | 65.68 | 59.20 | 47.39 | 41.70 | 27.48 | 48.41 | |||||||||||||
1979 | 27.06 | 31.46 | 36.19 | 45.30 | 52.57 | a | 60.07 | 65.06 | 60.23 | 54.80 | 43.03 | 29.97 | 24.39 | 44.18 | ||||||||||||
1980 | 28.32 | 32.21 | 35.16 | 41.83 | a | 52.24 | b | 66.80 | 70.29 | 66.29 | 60.13 | 44.17 | a | 32.90 | a | 28.77 | 46.59 | |||||||||
1981 | 32.27 | a | 32.86 | 38.23 | 49.77 | 56.29 | 65.70 | 69.29 | 64.23 | 59.10 | 49.68 | 36.07 | 30.68 | c | 48.68 | |||||||||||
1982 | 27.94 | 33.64 | c | 40.87 | 49.00 | a | 53.58 | 63.67 | 67.68 | 68.39 | 60.63 | 46.03 | a | 34.57 | b | 29.43 | c | 47.95 | ||||||||
1983 | 27.82 | c | 35.21 | 40.13 | 41.30 | 52.43 | a | 59.50 | 68.00 | a | 65.83 | a | 62.62 | a | 50.60 | a | 38.07 | 27.65 | e | 47.43 | ||||||
1984 | 26.79 | c | 28.93 | a | 38.87 | a | 47.52 | a | 61.93 | d | 67.17 | 68.32 | 67.23 | 59.23 | 49.37 | d | 37.07 | 35.84 | 49.02 | |||||||
1985 | 29.74 | 32.36 | 41.94 | 49.03 | a | 57.00 | b | 63.93 | a | 67.97 | 67.23 | a | 59.47 | 49.58 | 38.50 | d | 28.42 | 48.76 | ||||||||
1986 | 29.72 | b | 37.96 | 42.93 | a | 52.41 | a | 56.20 | a | 65.67 | 66.97 | 68.00 | b | 59.93 | 48.28 | b | 36.32 | b | 31.68 | l | 51.31 | a | ||||
1987 | 26.25 | c | 33.00 | a | 37.34 | b | 46.57 | 56.06 | 63.55 | a | 67.35 | 66.35 | 58.41 | a | 52.94 | 34.50 | 28.12 | n | 49.30 | a | ||||||
1988 | 27.66 | b | 33.63 | b | 39.06 | 47.33 | c | 55.87 | 58.90 | a | 67.29 | 67.26 | 57.60 | 51.53 | a | 38.20 | 34.25 | w | 49.48 | a | ||||||
1989 | 28.50 | g | 36.75 | 42.86 | b | 51.69 | a | 56.81 | 65.13 | 69.65 | 67.07 | b | 59.28 | a | 47.60 | a | 37.33 | 24.86 | q | 53.42 | b | |||||
1990 | 26.57 | h | 32.21 | i | 41.03 | a | 50.87 | 57.65 | 71.79 | b | 68.84 | 64.84 | 61.41 | a | 47.56 | f | 38.10 | j | 32.14 | q | 59.49 | e | ||||
1991 | 30.00 | u | 36.40 | h | 39.94 | 46.40 | 56.55 | 63.47 | 67.84 | 67.16 | 59.00 | 48.61 | 35.73 | 34.39 | 51.91 | b | ||||||||||
1992 | 31.17 | b | 35.83 | 41.10 | 49.00 | 57.19 | 63.23 | 68.61 | 66.23 | 61.30 | 49.69 | b | 32.43 | b | 33.40 | f | 50.53 | a | ||||||||
1993 | 36.89 | d | 35.30 | e | 39.88 | e | 49.48 | g | 58.07 | a | 65.93 | a | 70.97 | 68.45 | 60.57 | 47.50 | c | 36.75 | b | 32.26 | d | 50.23 | a | |||
1994 | 28.87 | a | 34.80 | c | 43.81 | 49.00 | c | 59.26 | 71.45 | a | 71.53 | a | 71.71 | 61.90 | a | 49.85 | d | 41.22 | c | 36.52 | f | 53.04 | a | |||
1995 | 33.48 | 40.75 | d | 43.21 | c | 47.43 | 57.23 | 66.27 | 69.42 | 71.10 | 62.07 | 48.65 | 40.33 | 38.38 | r | 52.72 | a | |||||||||
1996 | 29.52 | b | 40.23 | c | 40.39 | 49.79 | a | 62.23 | 69.33 | 71.52 | 67.87 | 59.97 | 50.14 | b | 37.59 | a | ----- | z | 52.60 | a | ||||||
1997 | 28.87 | h | 33.73 | b | 43.27 | a | 46.59 | a | 59.74 | d | 65.57 | 69.40 | a | 68.48 | 65.70 | 48.10 | 38.27 | 24.17 | y | 53.88 | b | |||||
1998 | 31.37 | d | 32.46 | b | 38.11 | c | 44.41 | a | 56.55 | b | 65.20 | 71.23 | 68.68 | 66.60 | 51.82 | c | 42.37 | 33.70 | u | 51.71 | a | |||||
1999 | 33.38 | e | 37.71 | 44.50 | a | 48.45 | a | 58.54 | c | 66.47 | 70.90 | 71.00 | a | 64.00 | 49.46 | c | 43.12 | e | ----- | z | 53.41 | a | ||||
2000 | 33.71 | g | 43.18 | l | 42.58 | 54.00 | b | 63.45 | 69.14 | a | 72.00 | a | 69.19 | 64.38 | d | 50.34 | b | 35.47 | m | ----- | z | 60.64 | d | |||
2001 | 29.71 | c | 36.32 | c | 42.43 | a | 49.81 | d | 61.74 | 69.47 | 72.27 | a | 68.74 | 62.52 | c | 50.74 | 42.64 | e | 29.75 | s | 53.31 | a | ||||
2002 | 30.94 | o | 29.44 | j | 39.29 | c | 54.07 | c | 58.45 | b | 69.88 | d | 69.50 | a | 70.53 | a | 63.36 | b | 50.92 | f | 39.06 | n | 34.14 | q | 60.73 | e |
2003 | 34.70 | k | 38.00 | j | 41.86 | j | 50.92 | e | 60.24 | f | 67.21 | a | 71.46 | c | 72.43 | c | 64.89 | c | 54.73 | i | 42.94 | m | 33.00 | w | 65.38 | g |
2004 | 34.32 | i | 31.82 | l | 46.42 | g | 50.09 | h | 60.07 | b | 66.67 | 70.42 | 67.68 | 61.90 | 54.03 | a | 39.14 | b | 33.46 | r | 59.99 | e | ||||
2005 | 34.84 | l | ----- | z | 41.05 | j | 50.91 | g | 60.46 | g | 68.56 | e | 73.00 | e | 69.27 | a | 65.04 | d | 52.44 | f | 41.11 | k | 29.20 | u | 68.97 | h |
2006 | ----- | z | 28.60 | m | 45.69 | o | 53.00 | e | 61.85 | d | 69.45 | a | ----- | z | 69.61 | 60.41 | a | 52.65 | e | 39.61 | l | 32.50 | q | 61.16 | f | |
2007 | 32.00 | o | 37.11 | i | 32.39 | c | 48.86 | a | 60.36 | c | 67.27 | 71.13 | 71.33 | a | 65.03 | 52.35 | e | 43.32 | h | 37.56 | o | 58.59 | d | |||
2008 | 32.95 | l | 38.16 | j | 42.72 | b | 48.93 | b | 60.33 | d | 71.27 | 69.41 | b | 68.39 | 60.67 | 50.68 | f | 38.69 | n | 39.90 | u | 60.25 | e | |||
2009 | 32.22 | m | 36.63 | i | 42.77 | e | 49.72 | e | 62.83 | b | 68.83 | 73.68 | c | 70.65 | h | 62.00 | f | ----- | z | ----- | z | ----- | z | 59.57 | g | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 27.66 | 31.78 | 38.23 | 46.26 | 54.82 | 63.55 | 67.62 | 65.87 | 59.13 | 47.23 | 35.10 | 27.96 | 45.94 | |||||||||||||
S.D. | 3.40 | 3.84 | 3.26 | 3.56 | 3.78 | 3.80 | 2.64 | 2.91 | 3.23 | 3.27 | 3.69 | 3.26 | 1.70 | |||||||||||||
SKEW | 0.10 | 0.08 | -0.05 | -0.05 | 0.44 | 0.13 | 0.14 | 0.06 | 0.06 | -0.12 | 0.00 | -0.21 | -0.16 | |||||||||||||
MAX | 36.89 | 40.75 | 44.50 | 54.07 | 63.45 | 71.79 | 73.68 | 72.43 | 66.60 | 54.03 | 43.12 | 35.84 | 49.02 | |||||||||||||
MIN | 19.29 | 23.34 | 32.10 | 38.37 | 47.90 | 53.27 | 62.00 | 59.42 | 51.47 | 40.97 | 24.97 | 19.61 | 41.96 | |||||||||||||
YRS | 57 | 60 | 67 | 68 | 69 | 71 | 69 | 70 | 70 | 62 | 59 | 48 | 40 |