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 | 43.38 | a | 36.45 | 39.92 | j | |
1938 | 34.33 | g | 39.94 | d | 42.61 | 54.82 | 60.15 | 69.20 | 75.23 | 72.66 | ----- | z | ----- | z | ----- | z | 32.15 | a | 55.84 | d | ||||||
1939 | 33.65 | 33.29 | b | 45.60 | b | 54.87 | 63.16 | 65.93 | a | 77.63 | 75.21 | 62.78 | 52.46 | c | 37.43 | b | 36.48 | c | 53.21 | |||||||
1940 | 33.45 | 40.04 | e | 46.77 | 52.67 | 64.27 | 72.92 | 78.17 | a | 75.90 | 64.17 | 53.03 | b | 39.05 | b | 34.50 | a | 54.58 | ||||||||
1941 | 33.90 | a | 38.73 | b | 46.48 | a | 51.58 | 61.60 | a | 67.05 | b | 77.56 | 72.70 | a | 59.90 | 51.10 | 41.08 | 35.84 | c | 53.13 | ||||||
1942 | 21.65 | a | 32.45 | 40.55 | 52.87 | 56.18 | 63.68 | 78.80 | a | 73.84 | 63.78 | 53.35 | 38.83 | 35.29 | 50.94 | |||||||||||
1943 | 29.67 | a | 34.44 | a | 41.44 | 55.50 | 56.44 | 63.32 | 73.82 | 72.12 | a | 66.17 | 54.82 | 40.53 | a | 36.39 | 52.05 | |||||||||
1944 | 24.10 | 35.69 | 41.02 | 50.37 | 60.53 | a | 64.34 | a | 74.10 | 71.39 | 62.57 | ----- | z | 39.47 | a | 29.75 | a | 50.30 | a | |||||||
1945 | 31.84 | 39.39 | 41.35 | 49.97 | 60.19 | 64.23 | 76.44 | 73.15 | 59.58 | 52.02 | 39.98 | 30.90 | a | 51.59 | ||||||||||||
1946 | 29.90 | a | 34.18 | 45.71 | 53.43 | 60.02 | a | 68.00 | 76.63 | 74.10 | 60.55 | a | 47.82 | 39.37 | d | 35.79 | c | 52.12 | ||||||||
1947 | 23.45 | a | 38.00 | a | 45.48 | 52.40 | 65.53 | a | 64.25 | 76.42 | 72.66 | 62.03 | 54.71 | 38.05 | b | 32.85 | 52.15 | |||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.12 | f | 70.80 | c | 62.57 | b | 52.35 | 39.03 | 24.55 | a | 49.86 | g | ||
1949 | 9.72 | a | 33.16 | 46.37 | d | 55.46 | b | 63.77 | c | 68.41 | b | 75.24 | b | 74.69 | e | 65.46 | e | 47.18 | c | 41.12 | a | 32.82 | a | 51.12 | ||
1950 | 25.18 | a | 30.82 | 40.84 | 49.50 | b | 56.36 | c | 65.91 | a | 76.33 | d | 72.62 | e | 63.88 | b | 54.10 | a | 40.70 | 37.50 | 51.14 | |||||
1951 | 30.30 | a | 34.84 | 37.46 | e | 52.52 | f | 59.66 | f | 65.23 | d | 75.83 | b | 71.81 | e | 62.70 | b | 49.02 | a | 36.10 | a | 29.42 | 49.27 | b | ||
1952 | 25.87 | 28.36 | a | 38.13 | a | 52.31 | c | 59.22 | h | 66.17 | d | 72.53 | b | 73.74 | d | 63.80 | c | 53.02 | a | 33.22 | 32.23 | a | 49.04 | a | ||
1953 | 39.62 | a | 36.35 | b | 43.36 | c | 48.59 | b | 55.02 | j | 61.07 | c | 75.36 | c | 72.88 | j | 64.92 | f | 51.36 | c | 43.31 | a | 32.98 | 48.00 | c | |
1954 | 36.13 | 38.72 | a | 40.52 | b | 51.63 | d | 60.02 | g | 63.02 | e | 75.96 | h | 70.22 | h | 60.30 | j | 48.17 | a | 40.95 | b | 28.93 | a | 43.51 | d | |
1955 | 23.70 | a | 25.62 | c | 37.40 | g | 45.82 | h | 57.11 | l | 69.00 | h | 73.15 | g | 74.28 | f | 62.52 | b | 51.04 | d | 34.22 | 34.03 | a | 38.52 | f | |
1956 | 32.03 | 26.63 | b | 42.83 | b | 51.76 | a | 61.47 | a | 65.95 | 76.11 | 71.48 | 62.85 | 49.23 | 34.77 | 30.31 | 50.45 | |||||||||
1957 | 18.27 | 29.13 | a | 43.14 | c | 50.27 | 59.84 | 67.97 | 73.85 | 72.11 | 64.02 | 49.76 | 36.08 | 34.47 | 49.91 | |||||||||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.78 | a | ----- | z | 35.78 | k |
1962 | 19.52 | 30.73 | 40.24 | 53.59 | a | 57.37 | 67.50 | 73.45 | 70.63 | 63.05 | a | 50.73 | 41.12 | 33.47 | a | 50.12 | ||||||||||
1963 | 23.76 | 40.98 | 44.42 | a | 47.67 | a | 62.37 | 65.73 | 72.84 | 73.34 | 66.65 | 55.79 | 40.95 | 26.90 | b | 51.78 | ||||||||||
1964 | 25.75 | a | 26.07 | 39.50 | c | 48.68 | b | 57.53 | 64.77 | 75.74 | 70.26 | 60.14 | a | 51.08 | a | 38.02 | 33.53 | 49.26 | ||||||||
1965 | 31.10 | 36.80 | 38.95 | 53.30 | 57.92 | 66.97 | 73.77 | 70.87 | 57.72 | 53.68 | 43.32 | 29.35 | 51.15 | |||||||||||||
1966 | 34.08 | 35.25 | 43.58 | 51.07 | 62.89 | 66.25 | 74.42 | a | 73.42 | 67.27 | 48.65 | 42.67 | 32.08 | 52.63 | ||||||||||||
1967 | 34.58 | 38.07 | a | 42.61 | 45.52 | b | 58.48 | 66.98 | 78.79 | 76.81 | 67.80 | 49.13 | 41.05 | 28.31 | 52.34 | |||||||||||
1968 | 28.95 | 39.57 | a | 46.06 | 48.76 | c | 58.14 | b | 67.57 | 76.45 | 68.68 | 61.50 | 49.16 | 39.28 | 33.37 | 51.46 | ||||||||||
1969 | 30.42 | 33.07 | 40.65 | 51.82 | 63.35 | a | 68.10 | 73.63 | 73.02 | b | 63.59 | b | 47.27 | 38.18 | 33.42 | 51.38 | ||||||||||
1970 | 34.65 | 39.31 | a | 42.11 | 45.12 | 58.08 | a | 69.65 | 75.08 | 73.66 | 57.83 | 47.27 | 40.55 | 30.27 | 51.13 | |||||||||||
1971 | 32.89 | 37.18 | 39.65 | 50.16 | a | 61.61 | 64.66 | a | 74.77 | 77.44 | 57.83 | 48.61 | 38.02 | 29.76 | 51.05 | |||||||||||
1972 | 28.24 | 31.91 | 44.76 | 49.47 | a | 60.40 | 68.82 | 72.47 | 74.60 | a | 58.32 | 52.55 | 39.93 | 21.32 | 50.23 | |||||||||||
1973 | 28.97 | 37.41 | 44.30 | a | 50.47 | a | 61.31 | 67.55 | 76.36 | b | 72.92 | 61.83 | 50.12 | a | 40.30 | 36.00 | 52.29 | |||||||||
1974 | 27.48 | 37.45 | 43.40 | 50.35 | 57.26 | 71.68 | 74.35 | 72.89 | 64.40 | 51.44 | 40.48 | 30.24 | 51.79 | |||||||||||||
1975 | 24.48 | 34.66 | 40.92 | a | 44.92 | 56.32 | 65.25 | 78.66 | 69.16 | 63.91 | a | 50.77 | 36.83 | a | 29.37 | 49.60 | ||||||||||
1976 | 26.10 | a | 31.16 | 37.76 | 49.20 | 61.03 | 63.89 | b | 74.35 | 68.08 | 64.08 | 50.37 | 38.95 | 27.53 | 49.38 | |||||||||||
1977 | 18.90 | 30.89 | 41.84 | 55.15 | 55.06 | 73.58 | 73.58 | 74.52 | 62.08 | 52.16 | 38.83 | 37.27 | 51.16 | |||||||||||||
1978 | 35.06 | 38.61 | 47.95 | 50.63 | 57.62 | a | 67.07 | 74.77 | 71.25 | a | 61.43 | a | 52.40 | 34.72 | 25.35 | 51.41 | ||||||||||
1979 | 14.39 | 32.25 | 44.74 | 50.20 | 60.87 | 68.31 | a | 75.56 | 73.24 | 66.63 | 54.71 | 35.03 | 32.34 | 50.69 | ||||||||||||
1980 | 30.06 | 38.98 | 43.10 | 54.57 | 59.63 | 64.42 | 74.40 | a | 70.56 | 62.02 | a | 51.15 | a | 37.78 | 31.79 | 51.54 | ||||||||||
1981 | 34.00 | 36.07 | a | 45.15 | 52.33 | a | 58.69 | 65.30 | 73.66 | 76.73 | 63.87 | 47.87 | 42.98 | 32.73 | 52.45 | |||||||||||
1982 | 22.83 | a | 27.94 | c | 43.06 | 47.30 | 57.50 | a | 68.02 | a | 72.47 | 74.03 | 62.33 | a | 51.53 | b | 35.30 | 30.92 | 49.44 | |||||||
1983 | 30.58 | 39.98 | 46.42 | 48.85 | 59.89 | 65.92 | 70.73 | a | 74.39 | 61.40 | 52.21 | 43.12 | a | 25.53 | 51.58 | |||||||||||
1984 | 23.03 | 28.86 | a | 43.60 | 50.29 | b | 56.43 | a | 64.70 | b | 75.63 | 75.82 | 60.93 | 48.40 | 40.50 | 22.19 | 49.20 | |||||||||
1985 | 17.43 | a | 26.45 | 39.03 | 54.70 | 60.82 | 69.20 | 79.66 | 69.90 | a | 56.74 | a | 48.00 | 28.97 | 13.39 | 47.02 | ||||||||||
1986 | 22.60 | b | 38.52 | 49.17 | a | 51.77 | 60.95 | a | 74.72 | 72.20 | a | 77.48 | 59.12 | 51.77 | 40.57 | 27.50 | 52.20 | |||||||||
1987 | 25.13 | 37.80 | 45.52 | 57.80 | 65.08 | a | 70.43 | a | 73.18 | a | 72.00 | 65.50 | a | 53.32 | 39.73 | b | 32.81 | 53.19 | ||||||||
1988 | 23.93 | a | 35.05 | 44.92 | a | 53.74 | a | 59.64 | c | 71.33 | 77.03 | a | 73.10 | 61.95 | a | 58.76 | 41.15 | 26.44 | 52.25 | |||||||
1989 | 20.11 | c | 17.13 | b | 42.66 | b | 54.18 | 58.15 | d | 70.08 | 76.82 | a | 71.03 | 63.48 | b | 51.37 | 37.90 | 29.44 | 49.36 | |||||||
1990 | 34.28 | b | 34.98 | g | 45.36 | b | 56.67 | a | 58.74 | 67.81 | a | 76.76 | 73.94 | 70.22 | 49.97 | 39.52 | 19.80 | c | 53.91 | a | ||||||
1991 | 22.92 | 38.88 | 43.61 | c | 50.72 | c | 57.36 | b | 64.45 | b | 77.06 | 76.03 | b | 65.45 | a | 52.79 | 37.91 | a | 30.76 | 51.50 | ||||||
1992 | 31.65 | a | 40.97 | 49.71 | 55.48 | 65.23 | 71.74 | a | 71.98 | a | 75.45 | 62.16 | a | 54.11 | 36.78 | a | 27.61 | 53.57 | ||||||||
1993 | 24.14 | b | 26.45 | 40.42 | 49.95 | b | 63.84 | 63.23 | 66.83 | a | 68.90 | a | 62.81 | a | 53.17 | a | 31.03 | a | 33.95 | 48.73 | ||||||
1994 | 32.92 | 33.36 | 46.95 | 54.27 | 61.89 | 67.57 | 77.58 | a | 76.63 | a | 66.62 | 50.40 | 32.00 | 27.66 | b | 52.32 | ||||||||||
1995 | 33.42 | 41.61 | 44.65 | a | 50.73 | 59.86 | b | 65.62 | b | 73.95 | a | 70.22 | a | 65.63 | 48.97 | a | 42.09 | c | 32.90 | a | 52.47 | |||||
1996 | 33.17 | a | 34.64 | a | 46.16 | 51.42 | 57.56 | 67.85 | 77.70 | a | 72.45 | a | 61.91 | b | 51.52 | a | 41.25 | 34.39 | 52.50 | |||||||
1997 | 32.50 | 37.41 | a | 45.55 | 49.48 | b | 62.73 | 67.55 | 73.95 | 74.63 | 66.72 | 50.90 | a | 40.38 | a | 31.00 | c | 52.73 | ||||||||
1998 | 35.27 | a | 39.87 | a | 45.32 | a | 51.88 | a | 58.10 | b | 65.21 | a | 79.97 | 76.63 | 69.36 | a | 51.68 | a | 43.45 | b | 29.34 | 53.84 | ||||
1999 | 35.23 | c | 35.50 | a | 43.54 | c | 48.54 | e | 57.95 | b | 66.75 | 73.80 | a | 74.24 | d | 62.58 | 51.72 | a | 43.12 | a | 31.83 | a | 52.07 | |||
2000 | 32.71 | 40.02 | b | 43.50 | b | 55.17 | 60.93 | a | 68.80 | 76.52 | 75.55 | a | 60.59 | a | 50.52 | a | 33.07 | a | 30.02 | 52.28 | ||||||
2001 | 26.60 | 31.14 | 45.48 | a | 48.45 | 61.60 | 66.84 | a | 74.83 | a | 74.90 | 64.75 | b | 49.39 | 40.18 | 29.55 | a | 51.14 | ||||||||
2002 | 30.63 | d | 33.13 | b | 41.32 | 52.80 | 59.09 | c | 69.94 | d | 78.40 | b | 70.07 | a | 62.84 | b | 48.28 | b | 35.48 | 34.66 | 51.39 | |||||
2003 | 33.76 | b | 35.36 | c | 45.50 | 49.13 | d | 58.47 | 69.80 | b | 78.76 | 73.62 | a | 61.12 | b | 53.60 | 36.14 | a | 37.53 | 52.73 | ||||||
2004 | 27.42 | 34.17 | 49.32 | a | 54.88 | a | 59.66 | 68.74 | c | 78.14 | c | 74.39 | c | 63.19 | a | 53.82 | 38.25 | 34.16 | 53.01 | |||||||
2005 | 31.68 | 35.02 | d | 45.53 | b | 50.34 | b | 57.98 | k | 64.77 | h | 77.18 | l | 75.65 | h | 61.75 | j | 51.50 | l | 36.53 | k | 23.97 | l | 40.64 | h | |
2006 | 34.64 | j | 35.21 | i | 42.93 | j | 50.85 | j | 62.31 | j | 71.29 | i | 81.18 | l | 72.55 | i | 62.50 | l | 49.48 | i | 39.45 | j | 28.25 | o | ----- | z |
2007 | 26.82 | i | 37.47 | i | 46.05 | i | 49.52 | i | 62.40 | j | 68.25 | j | 80.10 | k | 71.41 | i | 60.61 | k | 51.02 | i | 39.25 | j | 36.50 | o | ----- | z |
2008 | 24.95 | i | 35.52 | i | 42.14 | j | 46.02 | i | 59.85 | k | 66.26 | i | 76.02 | j | 73.50 | l | 61.00 | j | 49.17 | h | 41.83 | l | 29.03 | l | ----- | z |
2009 | 29.82 | k | 35.63 | i | 41.20 | i | 51.76 | i | 58.92 | m | 64.14 | h | 71.08 | k | 75.30 | k | 67.65 | j | 46.92 | k | 37.82 | k | 24.83 | j | ----- | z |
2010 | 35.72 | o | 36.60 | m | 44.28 | h | 49.73 | d | 54.93 | b | 65.53 | a | 75.39 | 72.50 | b | 64.27 | 54.98 | 38.88 | 29.11 | d | 56.15 | c | ||||
2011 | 27.15 | 34.93 | 43.47 | 47.34 | a | 55.83 | a | 64.41 | a | 74.98 | 76.85 | 68.45 | b | 52.78 | a | 37.72 | 28.94 | 51.07 | ||||||||
2012 | 33.44 | 36.21 | a | 45.03 | 55.09 | b | 59.67 | b | 66.19 | f | 79.95 | a | 76.60 | b | 65.57 | a | 49.32 | 41.53 | a | 34.23 | a | 52.42 | a | |||
2013 | 15.59 | c | 35.39 | a | 43.84 | b | 51.06 | f | 61.63 | a | 68.73 | 81.72 | a | 78.48 | 66.83 | 49.98 | a | 37.76 | a | 20.82 | a | 50.98 | a | |||
2014 | 28.17 | b | 36.57 | 47.02 | a | 51.07 | 61.15 | h | 69.02 | a | 80.35 | 73.50 | b | 65.96 | e | 53.00 | c | 32.67 | c | 36.02 | 52.12 | a | ||||
2015 | 31.64 | b | 42.76 | a | 46.97 | 49.52 | g | 62.36 | b | 76.42 | 76.78 | a | 75.64 | c | 63.71 | d | 58.23 | 38.38 | b | 31.44 | 54.94 | a | ||||
2016 | 29.71 | 40.02 | 46.28 | b | 53.43 | b | 60.19 | e | 72.21 | a | 75.21 | c | 75.43 | a | 64.56 | e | 53.50 | c | 43.62 | b | 20.29 | 52.87 | ||||
2017 | 16.00 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | 63.62 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2020 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.35 | 30.40 | j | 38.35 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 28.17 | 34.87 | 43.68 | 51.46 | 59.87 | 67.36 | 75.60 | 73.39 | 63.25 | 51.43 | 38.73 | 30.74 | 51.49 | |||||||||||||
S.D. | 5.95 | 4.76 | 2.80 | 2.81 | 2.58 | 2.94 | 2.52 | 2.36 | 2.80 | 2.48 | 3.16 | 4.65 | 1.41 | |||||||||||||
SKEW | -0.75 | -1.03 | -0.19 | -0.09 | 0.22 | 0.70 | -0.27 | -0.12 | 0.01 | 0.47 | -0.74 | -1.19 | -0.63 | |||||||||||||
MAX | 39.62 | 42.76 | 49.71 | 57.80 | 65.53 | 76.42 | 81.72 | 78.48 | 70.22 | 58.76 | 43.62 | 37.53 | 54.58 | |||||||||||||
MIN | 9.72 | 17.13 | 37.46 | 44.92 | 54.93 | 61.07 | 66.83 | 68.08 | 56.74 | 47.18 | 28.97 | 13.39 | 47.02 | |||||||||||||
YRS | 68 | 68 | 68 | 66 | 63 | 67 | 67 | 67 | 67 | 68 | 72 | 71 | 56 |