YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 93.32 | 91.16 | f | 83.54 | b | ----- | z | ----- | z | ----- | z | 88.43 | j | |
1934 | ----- | z | 61.25 | b | 72.65 | 74.77 | 81.03 | 80.62 | 92.29 | 90.72 | a | 83.27 | 74.52 | 63.02 | 55.67 | a | 75.43 | a | ||||||||
1935 | 52.06 | 57.46 | 58.02 | 67.47 | 72.44 | 86.72 | 89.55 | 88.79 | 85.12 | a | 71.24 | 57.88 | 53.84 | 70.05 | ||||||||||||
1936 | 54.37 | 55.53 | 64.87 | 71.22 | 79.40 | 87.07 | 91.75 | a | 90.31 | 82.40 | 71.04 | e | 61.87 | 52.47 | 71.86 | |||||||||||
1937 | 40.56 | 53.84 | 59.53 | 67.98 | 77.13 | 84.50 | 92.37 | 92.74 | 87.42 | 75.06 | 62.85 | 58.34 | 71.03 | |||||||||||||
1938 | 56.44 | 54.44 | b | 57.20 | a | 67.77 | 75.42 | 83.16 | b | 89.48 | 88.61 | 84.47 | 69.77 | 56.60 | a | 56.35 | 69.98 | |||||||||
1939 | 52.52 | a | 50.59 | a | 62.06 | 71.59 | b | 77.26 | 84.08 | 91.06 | 91.95 | a | 81.30 | 72.60 | a | 64.05 | 56.77 | 71.32 | ||||||||
1940 | 54.84 | 56.29 | 64.87 | 70.70 | 79.77 | 87.05 | 88.16 | 89.85 | 80.96 | g | 71.44 | g | 58.32 | 54.52 | 70.44 | b | ||||||||||
1941 | 51.21 | 56.38 | 59.05 | 62.10 | 75.18 | 78.48 | 86.37 | 82.68 | 73.31 | a | 65.62 | w | 60.85 | f | 51.09 | h | 69.42 | c | ||||||||
1942 | 54.32 | a | 52.11 | 58.78 | b | 65.82 | 72.32 | 81.80 | 91.79 | 88.34 | 79.32 | 72.53 | 63.65 | 55.06 | 69.65 | |||||||||||
1943 | 52.79 | 57.64 | 63.42 | 69.50 | 77.85 | a | 79.70 | 89.73 | 87.56 | 84.52 | 70.65 | 58.73 | 51.92 | 70.33 | ||||||||||||
1944 | 49.39 | 49.71 | 58.11 | 64.10 | 72.98 | 76.10 | 86.50 | 88.19 | 82.57 | 71.34 | 55.85 | 52.44 | 67.27 | |||||||||||||
1945 | 52.77 | 56.11 | 53.92 | 64.90 | 72.90 | 80.18 | 90.55 | 87.26 | 82.62 | 72.27 | 60.70 | 49.92 | 68.68 | |||||||||||||
1946 | 53.24 | 51.80 | a | 58.52 | 68.98 | 72.82 | 83.62 | 87.03 | 88.24 | 81.87 | 65.21 | 54.75 | 54.77 | 68.40 | ||||||||||||
1947 | 50.48 | 57.88 | 61.45 | 68.24 | c | 78.10 | 81.76 | a | 89.66 | 85.37 | 85.38 | 71.33 | a | 56.65 | 51.52 | 69.82 | ||||||||||
1948 | ----- | z | ----- | z | 55.52 | 68.14 | a | 74.25 | a | 81.73 | 87.86 | b | 89.44 | 84.32 | 71.73 | 57.55 | 48.66 | 71.92 | b | |||||||
1949 | 42.52 | 49.09 | 56.85 | 70.67 | 73.35 | 85.10 | 89.13 | 87.11 | 86.32 | 68.89 | 65.58 | 50.31 | 68.74 | |||||||||||||
1950 | 46.08 | 57.66 | 61.85 | 72.27 | 73.40 | 82.27 | 89.66 | 88.31 | 80.57 | a | 75.47 | 63.90 | 59.19 | 70.89 | ||||||||||||
1951 | 51.42 | 52.88 | 59.60 | a | 66.40 | 74.42 | 80.82 | 90.27 | 87.84 | 84.30 | 72.13 | 57.77 | 49.97 | 68.98 | ||||||||||||
1952 | 47.16 | 53.88 | 54.10 | 66.50 | 78.82 | 79.07 | 88.90 | 91.52 | 85.05 | 76.90 | 56.55 | 50.77 | 69.10 | |||||||||||||
1953 | 57.82 | 54.64 | 59.47 | 66.02 | 68.12 | f | 80.25 | 92.90 | 88.60 | 83.36 | a | 73.27 | 62.62 | b | 54.12 | a | 70.28 | a | ||||||||
1954 | 51.38 | b | 62.62 | 57.32 | 72.45 | 77.71 | b | 82.48 | 91.42 | 86.00 | 83.35 | 73.89 | 65.22 | 53.06 | 71.41 | |||||||||||
1955 | 48.29 | 51.79 | 59.85 | 64.25 | 72.81 | 81.28 | 87.60 | 88.44 | 83.25 | 74.77 | 60.70 | 54.53 | 68.96 | |||||||||||||
1956 | 55.20 | a | 50.52 | 60.95 | a | 65.13 | 74.87 | 84.23 | 88.27 | 85.68 | 86.48 | a | 69.42 | 60.72 | 55.76 | 69.77 | ||||||||||
1957 | 50.13 | a | 59.79 | 61.37 | a | 66.77 | 69.81 | 86.75 | 91.23 | 87.66 | 82.48 | 67.84 | 56.28 | 54.08 | a | 69.52 | ||||||||||
1958 | 54.36 | b | 58.04 | 55.03 | a | 67.28 | a | 79.35 | 83.47 | 88.76 | 91.10 | 85.10 | 75.77 | 60.75 | 57.11 | 71.34 | ||||||||||
1959 | 54.10 | a | 53.09 | 64.29 | 71.15 | 72.76 | 85.65 | 93.19 | 87.79 | 80.25 | 73.73 | 61.85 | 53.82 | 70.97 | ||||||||||||
1960 | 46.86 | b | 53.26 | 64.89 | h | 69.25 | 74.08 | 86.33 | a | 91.35 | 89.29 | c | 84.87 | d | 71.35 | 60.85 | 52.83 | a | 70.94 | a | ||||||
1961 | 56.72 | b | 58.73 | 61.31 | 69.13 | 73.47 | 86.40 | 90.97 | 89.48 | 79.90 | 70.71 | 58.82 | 53.12 | a | 70.73 | |||||||||||
1962 | 55.11 | 55.57 | 55.08 | 73.12 | 71.78 | b | 81.41 | c | 89.60 | 90.81 | b | 84.16 | a | 71.72 | b | 63.67 | 55.84 | 70.65 | ||||||||
1963 | 48.90 | 62.62 | 59.81 | 63.15 | 76.32 | 79.63 | 89.18 | 88.84 | 84.65 | 74.13 | 61.33 | 53.98 | 70.21 | |||||||||||||
1964 | 50.19 | 53.74 | 57.50 | b | 65.60 | 72.32 | 80.83 | 89.74 | 88.77 | 81.40 | 77.42 | a | 56.95 | 53.53 | 69.00 | |||||||||||
1965 | 53.85 | a | 56.29 | 56.34 | 65.08 | 72.90 | 77.60 | a | 89.08 | 88.81 | 77.72 | 74.67 | a | 61.45 | 52.30 | a | 68.84 | |||||||||
1966 | 49.19 | 51.20 | 61.66 | 71.17 | 76.63 | 83.47 | 89.32 | 90.00 | 82.10 | 70.66 | 60.40 | 54.24 | 70.00 | |||||||||||||
1967 | 52.52 | 58.22 | a | 61.15 | a | 57.82 | 72.89 | 78.15 | 91.11 | 91.16 | 81.03 | 73.31 | 62.93 | 51.52 | a | 69.32 | ||||||||||
1968 | 52.69 | 61.64 | 62.71 | 65.42 | 74.85 | 82.60 | 87.71 | 84.19 | 82.03 | 70.39 | 61.53 | 47.77 | 69.46 | |||||||||||||
1969 | 55.45 | 51.57 | 59.81 | 67.42 | 74.74 | 78.90 | a | 88.88 | a | 93.00 | 84.38 | 69.85 | 61.98 | 53.47 | 69.95 | |||||||||||
1970 | 51.82 | 58.39 | a | 60.37 | a | 62.32 | 75.87 | 83.77 | 91.80 | a | 90.85 | 80.25 | 68.15 | 59.82 | 50.81 | 69.52 | ||||||||||
1971 | 53.60 | b | 57.32 | 61.15 | a | 64.71 | a | 69.39 | 80.97 | 90.92 | 88.31 | 82.25 | 65.35 | 56.67 | a | 48.19 | d | 68.24 | ||||||||
1972 | 49.82 | a | 58.10 | 68.30 | d | 67.83 | d | 74.75 | a | 83.21 | b | 92.17 | b | 86.95 | c | 80.47 | a | 67.26 | b | 56.60 | 50.58 | a | 69.67 | |||
1973 | 48.71 | 54.75 | 55.84 | 65.52 | 76.89 | 87.09 | a | 90.47 | 87.77 | 80.63 | 71.80 | a | 58.88 | b | 54.58 | 69.41 | ||||||||||
1974 | 49.84 | 55.50 | a | 61.13 | a | 67.95 | 74.69 | 86.87 | 89.44 | 87.33 | b | 84.68 | 72.11 | 60.05 | b | 50.67 | d | 70.02 | ||||||||
1975 | 51.22 | d | 51.08 | h | 55.33 | g | 59.12 | 72.90 | a | 82.09 | a | 89.45 | 87.11 | 83.50 | 69.39 | 59.28 | 55.45 | a | 70.95 | b | ||||||
1976 | 55.06 | 56.63 | b | 59.06 | 62.72 | 76.12 | a | 83.08 | 88.74 | 84.26 | 78.33 | a | 71.40 | 62.38 | a | 49.40 | u | 70.71 | a | |||||||
1977 | 52.35 | 60.34 | 55.45 | 67.66 | a | 68.05 | a | 84.55 | 90.33 | b | 88.89 | 81.88 | 73.76 | 62.78 | a | 56.76 | 70.23 | |||||||||
1978 | 52.78 | b | 55.50 | 61.85 | a | 63.67 | 73.39 | 85.28 | a | 90.02 | 87.32 | 81.50 | 76.50 | 58.34 | b | 49.42 | a | 69.63 | ||||||||
1979 | 47.18 | 52.50 | 57.75 | a | 66.22 | 74.15 | 83.98 | 88.15 | 84.13 | 84.65 | 72.00 | c | 57.67 | 54.45 | b | 68.57 | ||||||||||
1980 | 55.43 | a | 58.14 | 57.39 | 65.23 | b | 68.89 | 80.75 | 91.32 | 87.23 | 82.55 | 72.81 | 62.18 | 58.44 | 70.03 | |||||||||||
1981 | 56.42 | 58.11 | 59.03 | 69.72 | 74.82 | 88.53 | 91.42 | 91.39 | 84.65 | 69.05 | b | 62.08 | 56.10 | 71.78 | ||||||||||||
1982 | 51.34 | 57.34 | 59.53 | 66.86 | b | 73.66 | 79.08 | 87.05 | a | 88.23 | 80.38 | a | 69.21 | 57.52 | 50.66 | 68.40 | ||||||||||
1983 | 55.21 | 56.37 | a | 59.66 | 61.00 | 74.17 | a | 80.20 | 88.18 | 85.40 | 84.42 | 71.34 | 59.86 | b | 54.26 | 69.17 | ||||||||||
1984 | 55.16 | 56.75 | a | 62.87 | 64.82 | 80.19 | 82.35 | 88.34 | 86.85 | 83.50 | 66.79 | 57.02 | 49.90 | 69.55 | ||||||||||||
1985 | 50.19 | 53.14 | 57.53 | 69.47 | 74.98 | 84.83 | 90.77 | 87.79 | 75.62 | 69.44 | 57.10 | a | 54.79 | 68.81 | ||||||||||||
1986 | 56.90 | 58.39 | 63.82 | 66.95 | 75.00 | 85.57 | 85.47 | 90.31 | 76.12 | 68.77 | 62.63 | 52.94 | 70.24 | |||||||||||||
1987 | 49.95 | a | 56.16 | 58.77 | 72.23 | 74.81 | 85.17 | a | 86.03 | 88.39 | 82.65 | 74.53 | 59.13 | 47.94 | 69.65 | |||||||||||
1988 | 51.67 | b | 58.03 | 62.92 | 66.30 | 75.42 | 82.55 | 90.73 | 87.48 | 80.98 | 76.18 | a | 60.28 | 52.58 | 70.43 | |||||||||||
1989 | 51.08 | a | 54.46 | 64.95 | 74.68 | 76.11 | 83.92 | 92.00 | 86.50 | 81.41 | b | 71.31 | 64.43 | a | 55.95 | a | 71.40 | |||||||||
1990 | 51.25 | a | 53.77 | 62.29 | 69.87 | 73.40 | a | 85.67 | 90.42 | 86.74 | 82.78 | 72.17 | a | 61.77 | 48.95 | a | 69.92 | |||||||||
1991 | 51.63 | 60.59 | a | 55.31 | 66.32 | 72.61 | 79.55 | 87.50 | 86.84 | 83.17 | 75.37 | 60.78 | 52.27 | a | 69.33 | |||||||||||
1992 | 52.93 | a | 59.05 | 58.92 | 69.45 | 76.82 | 81.58 | 87.15 | 89.05 | 83.20 | 72.10 | 58.62 | 49.34 | 69.85 | ||||||||||||
1993 | 51.56 | 54.46 | 63.92 | 70.02 | 76.92 | 82.18 | 84.06 | 86.45 | 80.58 | 71.19 | 56.55 | 50.81 | 69.06 | |||||||||||||
1994 | 54.07 | a | 51.64 | 63.31 | 69.05 | 73.94 | 87.58 | 90.50 | 92.03 | 84.55 | 69.31 | 53.58 | 52.47 | 70.17 | ||||||||||||
1995 | 52.77 | 62.00 | 61.05 | 65.83 | 70.89 | 80.36 | a | 89.31 | 91.50 | 85.85 | 72.19 | 63.82 | 54.93 | a | 70.88 | |||||||||||
1996 | 55.08 | 59.34 | a | 62.45 | 70.15 | 77.74 | 83.60 | 92.26 | 90.35 | 81.50 | 70.90 | a | 61.63 | 53.07 | a | 71.51 | ||||||||||
1997 | 53.47 | 56.18 | 65.37 | 67.65 | 82.79 | 82.05 | 87.03 | 91.77 | a | 84.58 | 70.10 | 61.33 | 50.82 | 71.10 | ||||||||||||
1998 | 52.97 | 52.38 | 59.00 | 62.45 | 69.74 | 78.47 | 92.21 | 91.84 | 81.77 | 70.05 | 60.18 | h | 52.79 | c | 69.42 | a | ||||||||||
1999 | 56.24 | 56.14 | 60.50 | 63.00 | a | 74.50 | a | 82.07 | 88.05 | a | 88.92 | a | 84.83 | 76.58 | 63.37 | 56.50 | 70.89 | |||||||||
2000 | 55.92 | 56.66 | 62.62 | a | 71.50 | 80.08 | a | 86.25 | 89.27 | 89.90 | 82.10 | a | 68.66 | 53.52 | 53.30 | a | 70.82 | |||||||||
2001 | 49.58 | 51.43 | a | 61.87 | 64.95 | b | 81.63 | a | 86.12 | a | 87.37 | 89.83 | a | 84.66 | a | 73.73 | 63.02 | 48.26 | 70.20 | |||||||
2002 | 50.89 | 54.89 | 58.74 | 68.83 | 74.52 | 85.42 | 92.40 | 87.19 | 83.45 | 68.58 | a | 61.52 | 51.00 | 69.79 | ||||||||||||
2003 | 58.95 | b | 54.44 | b | 61.75 | a | 63.88 | 76.24 | 83.67 | a | 92.47 | 89.79 | 84.96 | g | 77.19 | m | 54.89 | b | 52.02 | e | 68.81 | b | ||||
2004 | 51.45 | j | 53.29 | e | 68.68 | f | 68.96 | g | 77.02 | d | 84.06 | d | 89.71 | c | 89.16 | c | 82.50 | c | 68.31 | e | 56.20 | b | 52.22 | d | 72.50 | c |
2005 | 53.23 | g | 54.56 | c | 60.11 | d | ----- | z | 77.56 | e | 81.56 | d | 91.10 | g | 88.66 | c | 80.25 | t | 71.69 | g | 62.11 | c | 52.85 | 68.20 | e | |
2006 | 52.18 | a | 56.42 | b | 54.60 | a | 63.09 | b | 77.81 | 88.19 | c | 94.48 | 88.29 | 82.56 | c | 69.42 | 61.86 | a | 50.75 | a | 69.97 | |||||
2007 | 48.65 | a | 55.71 | 64.07 | c | 67.78 | 77.66 | 83.90 | 91.52 | 91.38 | a | 82.12 | a | 70.58 | a | 63.42 | 48.98 | b | 70.48 | |||||||
2008 | 48.21 | c | 53.84 | 60.92 | a | 66.48 | a | 71.93 | a | 86.11 | b | ----- | z | 89.85 | 84.02 | 72.13 | 64.89 | g | 51.42 | 68.49 | b | |||||
2009 | 55.37 | 53.79 | 59.73 | 65.08 | 80.65 | a | 80.20 | 92.84 | 88.71 | 85.85 | 68.44 | 61.30 | 50.47 | 70.20 | ||||||||||||
2010 | 53.77 | 56.55 | 57.60 | a | 63.02 | 70.55 | c | 82.88 | 90.35 | g | 89.24 | 82.55 | 68.34 | o | 57.59 | g | 55.47 | 67.96 | c | |||||||
2011 | 54.48 | 52.43 | 60.59 | b | 66.80 | 70.74 | 81.37 | 88.50 | a | 91.69 | 84.25 | 72.53 | 56.40 | 49.03 | 69.07 | |||||||||||
2012 | 54.39 | 55.91 | 59.57 | a | 69.23 | 78.34 | 85.37 | 88.97 | 90.72 | a | 84.63 | 73.05 | b | 62.02 | 53.24 | 71.29 | ||||||||||
2013 | 51.06 | 53.70 | 66.10 | 69.93 | 76.87 | 86.37 | 92.06 | 88.32 | 81.62 | 67.50 | 60.08 | 53.84 | 70.62 | |||||||||||||
2014 | 58.47 | 59.10 | c | 64.47 | 69.33 | 76.12 | a | 84.77 | 91.77 | 87.65 | 84.53 | 74.52 | 61.02 | 52.78 | h | 73.79 | a | |||||||||
2015 | 51.92 | a | 61.75 | 66.52 | 69.65 | 70.11 | d | 87.82 | 88.31 | 93.03 | a | 86.23 | 75.25 | a | 58.70 | b | 49.44 | g | 73.57 | a | ||||||
2016 | 52.18 | 59.75 | a | 64.26 | 65.91 | a | 73.06 | 87.27 | 91.66 | 91.27 | 80.32 | b | 74.47 | a | 62.12 | 53.60 | b | 71.32 | ||||||||
2017 | 51.71 | 58.45 | 66.32 | c | 70.17 | 75.32 | 87.41 | a | 94.06 | 91.21 | 83.25 | b | 74.85 | 65.68 | 57.97 | m | 74.40 | a | ||||||||
2018 | 56.00 | 56.48 | a | 60.33 | a | 70.62 | 74.41 | h | 85.21 | k | 93.53 | 93.86 | i | 86.48 | 70.92 | 60.82 | 52.92 | a | 67.57 | c | ||||||
2019 | 52.25 | a | 48.25 | b | 60.24 | 69.70 | 69.93 | a | 84.45 | 90.00 | 91.47 | 82.97 | 68.93 | a | 61.13 | 51.89 | l | 70.85 | a | |||||||
2020 | 53.85 | a | 56.38 | 57.87 | a | 67.82 | 80.58 | 85.10 | 90.98 | 95.02 | 86.75 | 75.73 | 61.47 | a | 53.68 | a | 72.10 | |||||||||
2021 | 54.14 | c | 56.62 | c | 57.03 | 70.30 | 77.18 | a | 90.28 | 94.92 | a | 90.98 | c | 86.02 | 68.62 | a | 67.34 | h | 52.84 | 72.63 | a | |||||
2022 | 53.42 | 56.32 | 62.50 | 70.58 | 77.27 | 88.47 | 93.02 | f | 92.53 | 86.10 | 74.44 | 58.24 | k | 52.50 | 71.41 | b | ||||||||||
2023 | 52.24 | d | 50.70 | 57.10 | 68.43 | 75.61 | 80.03 | 95.19 | 90.89 | 82.72 | 73.97 | 61.00 | c | 55.39 | 70.27 | |||||||||||
2024 | 52.94 | 56.88 | 59.66 | 66.41 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.49 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 52.36 | 55.77 | 60.43 | 67.40 | 75.07 | 83.34 | 90.08 | 88.98 | 82.88 | 71.73 | 60.22 | 52.90 | 70.00 | |||||||||||||
S.D. | 3.16 | 3.16 | 3.36 | 3.26 | 3.09 | 2.93 | 2.20 | 2.25 | 2.48 | 2.73 | 2.82 | 2.57 | 0.98 | |||||||||||||
SKEW | -0.86 | -0.01 | 0.55 | -0.29 | 0.11 | -0.06 | -0.06 | -0.13 | -1.10 | -0.06 | -0.35 | 0.06 | -0.08 | |||||||||||||
MAX | 58.95 | 62.62 | 72.65 | 74.77 | 82.79 | 90.28 | 95.19 | 95.02 | 87.42 | 77.42 | 65.68 | 59.19 | 72.10 | |||||||||||||
MIN | 40.56 | 48.25 | 53.92 | 57.82 | 68.05 | 76.10 | 84.06 | 82.68 | 73.31 | 65.21 | 53.52 | 47.77 | 67.27 | |||||||||||||
YRS | 87 | 89 | 88 | 88 | 88 | 89 | 87 | 89 | 88 | 85 | 84 | 84 | 69 |