YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1928 | 35.90 | 43.90 | 58.50 | c | 61.43 | 80.29 | 78.63 | 92.68 | 84.77 | 75.43 | 64.06 | 50.40 | 40.45 | 63.87 | ||||||||||||
1929 | 29.68 | 32.89 | 57.29 | 61.63 | 73.81 | 77.48 | a | 89.13 | 90.45 | 72.83 | a | 66.44 | f | 46.97 | a | 44.52 | 61.52 | a | ||||||||
1930 | 22.13 | 49.89 | 56.77 | i | 66.03 | 69.61 | 77.76 | a | 86.44 | d | 87.45 | b | 79.03 | 59.65 | 47.17 | 37.48 | 62.06 | a | ||||||||
1931 | 43.45 | 45.37 | a | 55.87 | 65.80 | 79.65 | 79.93 | 91.42 | 89.52 | 77.97 | 65.94 | 45.87 | 41.90 | 65.22 | ||||||||||||
1932 | 40.39 | 45.31 | 54.23 | 66.77 | 72.19 | 85.10 | ----- | z | 85.16 | 79.47 | 65.16 | 55.10 | 40.55 | 62.67 | a | |||||||||||
1933 | 46.10 | 40.57 | 55.58 | 65.37 | 68.65 | 81.10 | 90.61 | 88.81 | 73.21 | a | 67.23 | 51.50 | 51.32 | 65.00 | ||||||||||||
1934 | 52.06 | 52.29 | 64.52 | 74.13 | 78.61 | 82.77 | 90.32 | 90.65 | 77.93 | 65.93 | a | 54.97 | 45.06 | 69.10 | ||||||||||||
1935 | 45.77 | a | 46.64 | 53.35 | 60.93 | 74.26 | 82.10 | 88.81 | 87.13 | 80.67 | 61.84 | 43.87 | 37.80 | a | 63.60 | |||||||||||
1936 | 44.00 | a | 28.21 | 55.77 | 68.87 | 79.45 | 82.87 | 90.97 | 89.68 | 78.50 | 72.58 | 47.79 | a | 49.52 | 65.68 | |||||||||||
1937 | 26.33 | a | 44.50 | 58.71 | 62.87 | 77.27 | a | 81.53 | 91.52 | 83.97 | 80.53 | 70.00 | 53.93 | 44.97 | 64.68 | |||||||||||
1938 | 43.71 | 43.07 | 56.95 | j | 65.90 | 74.93 | b | 84.53 | 96.48 | 84.68 | 81.50 | 65.84 | 46.17 | 44.71 | 66.50 | a | ||||||||||
1939 | 47.74 | 42.79 | 55.39 | 67.40 | 75.35 | 77.80 | 90.26 | 90.45 | 81.70 | 66.77 | 50.70 | 47.60 | a | 66.16 | ||||||||||||
1940 | 36.23 | 46.79 | 59.10 | 65.27 | 79.26 | 86.90 | 89.61 | 88.97 | 79.20 | 68.29 | 44.67 | 43.35 | 65.64 | |||||||||||||
1941 | 38.42 | 49.71 | 63.61 | 67.93 | 71.53 | a | 78.77 | 93.26 | 85.74 | 73.33 | 62.42 | 55.37 | 46.47 | a | 65.55 | |||||||||||
1942 | 28.26 | 46.32 | 59.00 | 68.73 | 70.29 | 77.57 | 90.39 | 90.03 | 81.30 | 69.20 | a | 48.73 | 46.13 | 64.66 | ||||||||||||
1943 | 34.45 | 44.96 | 54.71 | 68.57 | 69.03 | 76.10 | 90.55 | 85.84 | 82.69 | d | 65.39 | 47.30 | 38.45 | 63.17 | ||||||||||||
1944 | 41.45 | 45.97 | 56.86 | j | 65.27 | 74.71 | 79.97 | 90.19 | 86.45 | 82.23 | 70.55 | 48.47 | 37.13 | 65.67 | a | |||||||||||
1945 | 43.94 | 49.79 | 54.19 | 62.53 | 74.10 | 80.60 | 92.58 | 89.58 | 74.77 | 69.03 | 51.00 | 41.42 | 65.29 | |||||||||||||
1946 | 46.84 | 52.04 | 56.45 | 67.43 | 75.19 | 78.37 | 89.23 | 88.84 | 75.83 | 61.39 | 49.30 | 46.84 | 65.65 | |||||||||||||
1947 | 41.03 | 51.46 | 61.52 | 68.27 | 81.06 | 78.17 | 87.52 | 84.94 | 79.37 | 65.40 | a | 50.20 | 44.74 | 66.14 | ||||||||||||
1948 | 41.23 | 45.55 | 53.81 | 61.17 | 67.52 | 82.47 | 85.16 | 83.48 | 77.07 | 63.35 | 51.97 | a | 38.40 | a | 62.60 | |||||||||||
1949 | 25.90 | 43.36 | 55.32 | 72.36 | b | 77.84 | 81.67 | 87.61 | 86.61 | 79.63 | 62.97 | 55.67 | 46.16 | 64.59 | ||||||||||||
1950 | 26.26 | 43.96 | 54.35 | 63.83 | 73.39 | 77.67 | 89.16 | 88.23 | 80.07 | 63.10 | 50.83 | 47.39 | 63.19 | |||||||||||||
1951 | 43.55 | b | 48.00 | 52.65 | 70.10 | 75.97 | 80.80 | 90.10 | 86.23 | 80.07 | 62.13 | 50.76 | m | ----- | z | 68.96 | b | |||||||||
1952 | ----- | z | ----- | z | 61.57 | x | 72.03 | 75.26 | 78.93 | 90.16 | 87.71 | 81.60 | 72.23 | 44.03 | 49.08 | r | 75.24 | d | ||||||||
1953 | ----- | z | ----- | z | ----- | z | 64.20 | y | 70.55 | 74.43 | 90.16 | 86.23 | a | 82.60 | 68.35 | 56.00 | a | 50.77 | 72.39 | d | ||||||
1954 | 41.73 | a | 46.71 | 55.32 | 64.30 | 75.90 | 75.93 | b | 90.62 | w | 83.37 | a | 77.00 | c | 63.45 | b | 56.31 | d | 43.71 | 62.16 | a | |||||
1955 | 40.97 | b | 46.88 | k | 52.06 | 59.17 | a | 70.03 | a | 83.60 | 85.17 | a | 89.06 | 78.67 | c | 67.61 | m | 42.52 | c | 42.75 | c | 64.40 | b | |||
1956 | 43.73 | e | 36.62 | c | 55.39 | c | 67.08 | e | 75.80 | a | 78.68 | b | 92.55 | i | 87.63 | a | 80.43 | b | ----- | z | 45.44 | c | 45.80 | a | 61.66 | b |
1957 | 28.48 | b | 47.29 | 55.17 | a | 65.61 | b | 74.71 | 81.90 | a | 86.53 | a | 84.03 | a | 82.04 | c | 59.89 | d | 52.31 | a | 51.10 | u | 65.27 | a | ||
1958 | ----- | z | ----- | z | 56.32 | 62.57 | 81.35 | 85.47 | 93.81 | 93.00 | 78.63 | 69.73 | a | 52.48 | a | 46.55 | 71.99 | b | ||||||||
1959 | 44.87 | 47.25 | 58.32 | 66.70 | 70.42 | 81.53 | 92.55 | 84.55 | 74.47 | 66.87 | 50.10 | 40.48 | 64.84 | |||||||||||||
1960 | 34.13 | 49.21 | 56.87 | 65.62 | a | 70.10 | 83.90 | a | 95.94 | 83.84 | 80.63 | 67.42 | 52.55 | a | 36.10 | 64.69 | ||||||||||
1961 | 45.73 | a | 55.89 | 57.97 | 64.03 | 71.61 | 88.53 | 92.87 | 93.16 | 76.52 | a | 65.03 | 47.43 | 44.77 | 66.96 | |||||||||||
1962 | 41.39 | 48.29 | 53.84 | 69.13 | 66.10 | 80.93 | 89.68 | 84.48 | 79.83 | 64.39 | 55.07 | 47.48 | 65.05 | |||||||||||||
1963 | 38.23 | 48.93 | 58.77 | 60.50 | 73.52 | 80.70 | 84.65 | 88.58 | 83.63 | 69.65 | 53.87 | 38.19 | 64.93 | |||||||||||||
1964 | 49.71 | 53.59 | 55.35 | 62.90 | 71.19 | 78.40 | 87.13 | 82.77 | 76.27 | 64.94 | 48.13 | 41.06 | 64.29 | |||||||||||||
1965 | 43.42 | 52.50 | 56.45 | 67.47 | 71.94 | 80.63 | 88.87 | 85.94 | 75.10 | 70.74 | 53.23 | 44.10 | 65.87 | |||||||||||||
1966 | 45.55 | 50.61 | 58.94 | 68.26 | c | 78.06 | 80.33 | 85.18 | t | 88.45 | b | 88.88 | v | 68.10 | b | 53.60 | 49.35 | 64.13 | b | |||||||
1967 | 52.48 | 54.93 | 56.68 | 58.70 | 73.26 | 85.23 | 92.63 | a | 96.68 | 85.77 | 69.06 | 51.43 | 45.68 | 68.54 | ||||||||||||
1968 | 48.61 | 51.41 | 61.06 | 63.90 | 73.77 | 81.40 | 93.68 | 83.58 | 78.63 | 63.35 | 51.47 | 41.61 | 66.04 | |||||||||||||
1969 | 31.39 | 42.21 | 57.10 | 63.43 | 77.13 | 85.77 | 89.16 | 86.90 | 79.63 | 61.55 | 53.53 | 41.84 | 64.14 | |||||||||||||
1970 | 40.74 | 48.89 | 55.42 | 59.80 | 74.94 | 83.93 | c | 91.26 | 90.35 | 73.13 | 62.48 | 51.23 | 45.39 | 64.80 | ||||||||||||
1971 | 48.90 | 50.96 | 53.74 | 63.87 | 74.35 | 74.97 | 92.29 | 93.48 | 74.17 | 62.73 | a | 54.07 | 44.61 | 65.68 | ||||||||||||
1972 | 42.58 | 46.21 | 59.62 | b | 61.73 | 76.52 | 82.70 | 89.06 | 90.90 | 74.73 | 64.10 | 51.07 | 37.03 | 64.69 | ||||||||||||
1973 | 41.39 | 47.68 | 58.16 | 66.27 | 77.00 | 81.57 | 91.23 | 87.61 | 77.20 | 64.94 | 48.17 | 48.35 | 65.80 | |||||||||||||
1974 | 38.29 | 53.14 | 57.90 | 61.33 | 67.90 | a | 84.13 | 86.06 | 88.00 | 81.60 | 66.03 | 52.00 | 47.61 | 65.33 | ||||||||||||
1975 | 43.29 | 43.43 | 51.42 | 57.00 | 70.23 | 77.39 | b | 90.23 | 83.06 | 79.90 | 63.68 | 52.77 | 47.29 | 63.31 | ||||||||||||
1976 | 45.74 | 47.69 | 52.97 | 60.30 | 73.77 | 75.77 | 86.77 | 80.58 | 81.20 | 65.58 | 50.50 | 44.06 | 63.75 | |||||||||||||
1977 | 31.87 | 49.57 | 53.35 | 68.77 | 66.39 | 84.33 | 85.29 | 90.94 | 72.20 | 63.71 | 50.67 | 43.55 | 63.39 | |||||||||||||
1978 | 38.77 | 46.82 | 58.42 | 60.63 | 68.94 | 81.50 | 87.35 | 83.58 | 73.53 | 66.68 | 44.97 | 40.70 | a | 62.66 | ||||||||||||
1979 | 23.16 | 45.50 | 57.19 | 61.67 | 73.26 | 81.93 | 89.68 | 86.42 | 81.67 | 68.68 | 42.57 | 48.77 | 63.37 | |||||||||||||
1980 | 34.84 | 42.97 | 52.42 | 67.13 | 70.32 | 74.73 | 87.68 | 81.50 | g | 77.69 | a | 63.19 | 51.00 | 47.90 | b | 60.90 | a | |||||||||
1981 | 41.97 | 47.00 | 56.84 | 62.27 | 68.29 | 74.17 | 85.06 | 91.10 | 78.43 | 63.23 | 53.87 | 45.58 | 63.98 | |||||||||||||
1982 | 43.10 | b | 47.79 | 54.59 | b | 60.57 | 70.57 | a | 81.63 | 86.26 | 86.48 | 74.33 | 62.80 | a | 45.67 | 43.19 | 63.08 | |||||||||
1983 | 49.43 | a | 51.46 | 57.32 | 63.20 | 74.65 | 77.03 | 83.16 | 87.74 | 73.13 | 63.58 | 54.87 | 32.70 | a | 64.02 | |||||||||||
1984 | 43.97 | 47.72 | 56.83 | a | 60.60 | 66.55 | 74.80 | 89.23 | 87.52 | 73.80 | 62.00 | 50.17 | 36.50 | a | 62.47 | |||||||||||
1985 | 30.13 | 43.93 | a | 55.13 | 67.03 | 73.68 | 81.59 | a | 94.83 | b | 83.43 | a | 70.37 | 62.00 | 33.97 | a | 26.39 | 60.21 | ||||||||
1986 | 43.26 | 46.19 | a | 58.80 | a | 61.93 | 71.06 | 86.17 | a | 82.48 | 92.90 | 71.63 | 66.55 | 51.41 | a | 37.07 | a | 64.12 | ||||||||
1987 | 38.06 | 47.79 | 57.84 | 69.07 | 75.61 | 82.73 | 83.94 | 86.10 | 81.63 | 68.23 | 53.33 | 42.40 | a | 65.56 | ||||||||||||
1988 | 40.52 | 52.41 | 57.23 | 64.83 | 70.87 | 77.60 | 88.32 | 86.71 | 77.83 | 72.40 | a | 55.21 | a | 41.00 | a | 65.41 | ||||||||||
1989 | 47.58 | 34.44 | a | 54.97 | a | 66.73 | 69.94 | 82.47 | 86.94 | 83.32 | 79.77 | 65.20 | a | 54.83 | 40.84 | 63.92 | ||||||||||
1990 | 47.45 | 47.75 | 58.00 | 69.13 | 69.29 | 79.40 | 92.16 | 88.13 | 85.23 | 64.42 | 57.80 | 36.29 | 66.25 | |||||||||||||
1991 | 40.74 | 55.64 | 54.35 | 64.10 | 67.81 | 75.07 | 88.42 | 91.32 | 82.23 | 66.58 | 49.03 | 44.52 | 64.98 | |||||||||||||
1992 | 47.00 | 51.34 | 60.42 | 66.20 | 77.42 | 85.60 | 85.23 | 88.26 | 74.50 | 66.29 | 47.93 | 41.42 | 65.97 | |||||||||||||
1993 | 33.42 | 37.64 | 51.77 | 62.77 | 77.27 | a | 77.40 | 79.77 | 83.97 | 79.50 | 67.39 | 46.52 | a | 43.00 | b | 61.70 | ||||||||||
1994 | 49.61 | 44.81 | a | 60.77 | 67.23 | 73.90 | a | 79.93 | 92.26 | 87.90 | 81.90 | 64.23 | 48.60 | 45.00 | a | 66.35 | ||||||||||
1995 | 40.07 | a | 53.50 | 57.35 | 62.13 | 72.77 | 76.21 | a | 87.58 | 83.52 | 81.28 | a | 62.03 | 55.60 | 41.97 | a | 64.50 | |||||||||
1996 | 43.74 | 42.72 | 54.48 | 65.40 | 67.30 | a | 79.17 | 92.23 | 88.48 | 75.80 | 65.97 | a | 48.87 | 44.41 | b | 64.05 | ||||||||||
1997 | 43.26 | 47.64 | 57.53 | a | 61.97 | 75.13 | 78.30 | 86.55 | 89.65 | 78.57 | 65.65 | 51.50 | 43.07 | a | 64.90 | |||||||||||
1998 | 46.61 | 52.56 | a | 57.45 | 63.52 | a | 69.29 | 79.27 | 94.16 | 90.81 | 83.10 | 64.45 | 54.00 | 45.81 | 66.75 | |||||||||||
1999 | 50.71 | 51.67 | a | 56.77 | 62.83 | 69.77 | 78.47 | 87.39 | 88.71 | 78.67 | 65.52 | 56.90 | 46.52 | 66.16 | ||||||||||||
2000 | 43.61 | 48.41 | 55.80 | a | 68.24 | a | 72.58 | 80.57 | 88.65 | 88.97 | 75.03 | 62.52 | 43.80 | 37.94 | 63.84 | |||||||||||
2001 | 39.48 | 45.04 | 57.81 | 61.00 | 75.77 | 77.21 | a | 88.29 | 92.23 | 85.67 | 67.03 | 53.59 | a | 46.87 | 65.83 | |||||||||||
2002 | 46.90 | 52.50 | 52.97 | 65.30 | 70.37 | a | 81.60 | 92.03 | 85.32 | 78.07 | 62.58 | 50.00 | 46.13 | 65.31 | ||||||||||||
2003 | 47.20 | a | 48.82 | 59.61 | 61.63 | 69.84 | 82.87 | 92.55 | 89.81 | 81.90 | 70.79 | b | 47.31 | a | 44.84 | 66.43 | ||||||||||
2004 | 35.33 | a | 47.66 | 61.71 | 66.17 | 70.55 | 80.57 | 90.97 | 88.84 | 75.33 | 66.30 | a | 52.77 | 46.35 | 65.21 | |||||||||||
2005 | 42.55 | b | 50.57 | 59.74 | 64.60 | 73.13 | 78.55 | a | 90.10 | 90.26 | 76.30 | 65.55 | 48.37 | 36.65 | 64.70 | |||||||||||
2006 | 51.94 | 47.21 | 55.45 | 63.13 | 74.90 | 80.47 | 93.45 | 86.97 | 77.97 | 66.35 | 51.38 | a | 38.61 | 65.65 | ||||||||||||
2007 | 38.26 | 46.26 | a | 58.61 | 64.07 | 74.77 | 80.11 | b | 90.87 | 85.58 | 77.03 | 62.03 | a | 50.63 | 43.61 | 64.32 | ||||||||||
2008 | 43.17 | a | 49.75 | a | 54.61 | 59.53 | 71.58 | 78.43 | 89.26 | 86.65 | 77.27 | 65.73 | a | 52.33 | 39.70 | a | 64.00 | |||||||||
2009 | 41.57 | a | 45.32 | 51.87 | a | 64.23 | 74.29 | 81.57 | 91.58 | 87.16 | 81.97 | 59.52 | 53.90 | a | 34.31 | b | 63.94 | |||||||||
2010 | 45.52 | b | 50.04 | a | 58.34 | b | 62.34 | a | 67.14 | c | 75.83 | 88.80 | a | 85.84 | 75.90 | 63.71 | 48.17 | 40.77 | 63.53 | |||||||
2011 | 44.97 | 46.07 | 55.71 | 56.90 | 65.87 | 76.27 | 85.03 | 89.74 | 82.70 | 64.35 | 52.73 | 40.58 | 63.41 | |||||||||||||
2012 | 46.71 | 45.14 | 55.29 | 64.47 | 71.39 | 75.03 | 88.35 | 89.87 | 80.10 | 64.94 | 51.10 | 46.52 | 64.91 | |||||||||||||
2013 | 37.84 | 49.82 | 58.61 | 62.76 | a | 73.68 | 78.62 | a | 92.47 | a | 88.65 | 77.87 | 61.35 | 47.80 | 39.97 | 64.12 | ||||||||||
2014 | 41.71 | 40.61 | 57.65 | 63.70 | 75.55 | 79.43 | 93.10 | 88.97 | 79.43 | 70.81 | 49.73 | 44.42 | 65.43 | |||||||||||||
2015 | 42.55 | 54.00 | 62.94 | 64.17 | 75.84 | 88.63 | 91.94 | 88.32 | 75.83 | 68.77 | 47.47 | 44.29 | 67.06 | |||||||||||||
2016 | 43.19 | 54.10 | 58.94 | 70.83 | 73.90 | 82.13 | 85.97 | 89.65 | 76.07 | 63.48 | 59.77 | 38.81 | 66.40 | |||||||||||||
2017 | 31.10 | 43.82 | 57.23 | 62.83 | 75.71 | 81.93 | 92.65 | 91.39 | 79.07 | 65.03 | 54.47 | 38.77 | a | 64.50 | ||||||||||||
2018 | 48.84 | 49.18 | 56.23 | 64.67 | 78.63 | a | 80.77 | 92.84 | 89.23 | 77.30 | 63.68 | 49.73 | 46.48 | 66.46 | ||||||||||||
2019 | 44.35 | 34.96 | 46.97 | 64.73 | 74.19 | 81.47 | 86.29 | 88.48 | 76.70 | 61.27 | a | 49.00 | 43.42 | 62.65 | ||||||||||||
2020 | 51.10 | 52.79 | 55.35 | 66.93 | 73.35 | 79.93 | 90.19 | 89.61 | 79.83 | 67.84 | 55.53 | 46.23 | 67.39 | |||||||||||||
2021 | 49.06 | 45.18 | 60.68 | 68.57 | 75.61 | 89.63 | 94.71 | 89.03 | 79.73 | 65.87 | 57.80 | 43.26 | 68.26 | |||||||||||||
2022 | 41.19 | 48.11 | 57.74 | 55.77 | 63.84 | 76.30 | 91.68 | 93.52 | 80.83 | 69.35 | 42.07 | 34.52 | 62.91 | |||||||||||||
2023 | 44.94 | 44.71 | 51.35 | 59.50 | 75.97 | 82.27 | 92.48 | 88.29 | 76.50 | 63.65 | 45.53 | 43.52 | 64.06 | |||||||||||||
2024 | 36.81 | 48.66 | 57.58 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.68 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 41.33 | 47.14 | 56.60 | 64.49 | 73.10 | 80.39 | 89.61 | 87.80 | 78.41 | 65.44 | 50.54 | 42.82 | 64.85 | |||||||||||||
S.D. | 6.71 | 4.90 | 2.88 | 3.48 | 3.72 | 3.34 | 3.14 | 2.90 | 3.27 | 2.96 | 4.15 | 4.31 | 1.49 | |||||||||||||
SKEW | -0.88 | -1.11 | -0.05 | 0.11 | -0.08 | 0.36 | -0.41 | 0.14 | -0.13 | 0.39 | -0.71 | -0.80 | 0.08 | |||||||||||||
MAX | 52.48 | 55.89 | 64.52 | 74.13 | 81.35 | 89.63 | 96.48 | 96.68 | 85.77 | 72.58 | 59.77 | 51.32 | 69.10 | |||||||||||||
MIN | 22.13 | 28.21 | 46.97 | 55.77 | 63.84 | 74.17 | 79.77 | 80.58 | 70.37 | 59.52 | 33.97 | 26.39 | 60.21 | |||||||||||||
YRS | 94 | 93 | 92 | 95 | 96 | 96 | 92 | 95 | 95 | 93 | 95 | 93 | 81 |