YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.88 | v | 71.55 | 68.50 | d | 65.98 | 54.06 | 36.81 | a | 33.53 | b | 55.07 | f | |||
1957 | 35.69 | b | 42.46 | b | 41.06 | 46.87 | c | 54.59 | c | 67.10 | 72.95 | a | 69.19 | 60.62 | 51.25 | a | 34.34 | b | 35.46 | d | 50.97 | |||||
1958 | 28.92 | a | 39.00 | 34.93 | b | 46.08 | 59.73 | a | 68.85 | 72.73 | 71.34 | 63.21 | a | 49.77 | 40.76 | a | 36.98 | 51.03 | ||||||||
1959 | 32.48 | a | 33.96 | 39.21 | 51.46 | d | 57.32 | 68.00 | 70.21 | 69.19 | b | 63.60 | 50.95 | 38.47 | 30.81 | 50.47 | ||||||||||
1960 | 23.32 | 30.02 | b | 43.41 | b | 50.58 | 56.11 | 68.10 | 68.68 | 70.10 | 63.87 | 51.10 | 41.77 | 23.62 | a | 49.22 | ||||||||||
1961 | 23.23 | a | 34.43 | a | 41.27 | a | 47.03 | 59.29 | 67.22 | a | 69.40 | 68.60 | 59.30 | b | 51.52 | b | 33.90 | a | 31.12 | b | 48.86 | |||||
1962 | 29.13 | 39.89 | 36.66 | 52.22 | 59.77 | 65.43 | 69.66 | 70.40 | 64.30 | 53.61 | 43.62 | 34.10 | b | 51.57 | ||||||||||||
1963 | 24.21 | b | 34.09 | a | 40.79 | 51.33 | 61.05 | c | 67.50 | 73.63 | 68.90 | 63.67 | 56.23 | 42.78 | 30.13 | 51.19 | ||||||||||
1964 | 27.24 | 23.83 | 37.00 | 47.22 | 58.63 | 66.28 | 73.18 | 70.05 | 63.30 | 54.48 | a | 40.90 | 34.34 | 49.70 | ||||||||||||
1965 | 34.92 | 32.09 | a | 35.22 | b | 50.05 | 58.02 | 66.38 | 71.03 | 68.53 | a | 61.05 | 52.61 | 45.35 | 32.78 | b | 50.67 | |||||||||
1966 | 27.85 | 30.22 | a | 42.42 | 49.60 | 58.82 | 65.83 | 73.37 | 67.44 | 63.32 | 51.82 | 44.47 | a | 32.84 | 50.67 | |||||||||||
1967 | 31.13 | 35.84 | 46.56 | 52.02 | 57.35 | 65.57 | 72.08 | 66.16 | 60.21 | r | 53.64 | f | 42.89 | b | 26.10 | 49.57 | b | |||||||||
1968 | 27.87 | a | 36.28 | 38.94 | 45.28 | 56.35 | 67.83 | 69.66 | 66.56 | 60.88 | 52.42 | 40.17 | 29.28 | h | 51.11 | a | ||||||||||
1969 | 37.84 | 34.20 | 35.92 | 51.17 | 57.47 | a | 64.95 | 72.15 | 71.50 | 63.02 | 49.76 | 38.48 | 35.37 | 50.98 | ||||||||||||
1970 | 29.00 | 35.58 | h | 35.58 | 45.16 | h | 57.87 | 65.10 | a | 70.77 | 70.82 | 62.36 | a | 47.58 | 40.57 | 36.26 | 51.59 | b | ||||||||
1971 | 30.85 | 33.28 | c | 41.53 | 46.83 | 56.52 | 67.92 | 71.03 | a | 66.26 | 61.59 | b | 49.82 | 40.23 | 28.43 | b | 49.53 | |||||||||
1972 | 32.62 | a | 38.02 | a | 46.76 | 50.50 | 57.19 | 66.72 | 70.39 | 66.26 | 60.68 | 53.23 | 35.81 | c | 31.13 | 50.78 | ||||||||||
1973 | 29.65 | a | 33.64 | 38.82 | 42.27 | 55.79 | 63.88 | a | 69.13 | 69.31 | 61.13 | 52.85 | 43.83 | 33.66 | 49.50 | |||||||||||
1974 | 30.97 | a | 31.33 | b | 46.10 | 48.18 | 62.31 | 73.39 | p | 69.85 | 67.03 | 59.15 | 52.47 | 40.30 | 28.79 | 48.77 | a | |||||||||
1975 | 29.02 | 32.29 | 39.56 | 45.43 | a | 53.08 | 66.17 | 67.74 | 69.82 | 61.29 | b | 52.50 | 40.25 | 33.10 | 49.19 | |||||||||||
1976 | 30.69 | 41.03 | 40.77 | 49.25 | 55.98 | 66.58 | 68.68 | 67.94 | 61.22 | a | 47.13 | 36.33 | c | 29.55 | b | 49.60 | ||||||||||
1977 | 24.08 | a | 33.41 | 38.03 | 50.25 | 57.31 | 69.03 | 70.27 | a | 71.05 | a | 64.50 | 54.18 | 44.21 | f | 37.83 | h | 53.21 | b | |||||||
1978 | 32.17 | a | 33.20 | 43.20 | a | 50.66 | a | 56.25 | g | 68.17 | 72.90 | 67.32 | 61.85 | 53.84 | 41.60 | 29.17 | a | 50.37 | a | |||||||
1979 | 24.11 | 34.11 | 40.97 | 48.23 | 55.55 | 64.07 | 70.85 | 67.58 | 63.35 | 53.37 | 34.63 | 33.39 | 49.18 | |||||||||||||
1980 | 33.72 | b | 36.53 | 40.52 | a | 47.33 | 55.00 | 70.77 | 74.92 | 70.03 | 64.08 | 50.34 | 36.55 | 38.82 | 51.55 | |||||||||||
1981 | 33.98 | 37.82 | 39.71 | 53.31 | a | 58.52 | 70.22 | 72.03 | 69.23 | 62.98 | 52.23 | 44.37 | 36.93 | a | 52.61 | |||||||||||
1982 | 33.77 | c | 33.82 | 41.86 | b | 48.98 | 56.27 | 65.48 | e | 72.24 | 70.60 | 63.10 | 49.66 | 38.60 | a | 26.81 | b | 50.10 | ||||||||
1983 | 30.08 | a | 34.07 | a | 42.08 | 44.64 | a | 53.97 | 65.14 | a | 71.56 | 70.89 | 66.76 | a | 53.69 | 41.00 | 30.31 | 50.35 | ||||||||
1984 | 28.79 | 35.34 | 40.47 | 46.40 | 62.17 | b | 67.70 | 72.06 | 68.55 | 61.47 | a | 48.43 | c | 41.80 | h | 32.39 | m | 53.14 | b | |||||||
1985 | 26.69 | 32.46 | a | 41.87 | a | 50.78 | c | 58.23 | 66.02 | b | 70.16 | 69.85 | 61.88 | a | 52.50 | 42.42 | 31.69 | 50.38 | ||||||||
1986 | 36.26 | 36.76 | a | 44.53 | 49.29 | b | 52.12 | a | 65.65 | 69.65 | 70.45 | 61.52 | 49.10 | 36.88 | 30.82 | 50.25 | ||||||||||
1987 | 26.31 | 33.02 | 38.42 | 46.88 | 54.74 | 66.17 | 70.16 | 67.68 | 60.48 | a | 55.16 | 39.82 | 29.12 | b | 49.00 | |||||||||||
1988 | 29.00 | 36.76 | 40.37 | 47.53 | 56.77 | 66.20 | 69.63 | 67.35 | 60.12 | 54.02 | 40.78 | 28.12 | a | 49.72 | ||||||||||||
1989 | 31.15 | 34.14 | 46.87 | a | 52.93 | 60.56 | 67.07 | a | 70.76 | 68.39 | 63.83 | a | 52.10 | 41.82 | 29.75 | a | 51.61 | |||||||||
1990 | 29.79 | 32.91 | 40.89 | 49.57 | 55.63 | 73.18 | 70.48 | 66.80 | a | 63.40 | 52.39 | 42.07 | 28.73 | 50.49 | ||||||||||||
1991 | 30.21 | 38.35 | a | 40.90 | 49.23 | 58.79 | 65.67 | 68.32 | 68.24 | 60.30 | 52.26 | 36.62 | 28.89 | 49.82 | ||||||||||||
1992 | 22.84 | 35.88 | 43.29 | 52.17 | 56.47 | 64.90 | 69.84 | 69.10 | a | 64.13 | 55.00 | 33.45 | 25.93 | a | 49.42 | |||||||||||
1993 | 35.57 | a | 38.32 | 43.11 | 50.57 | a | 57.83 | a | 67.72 | 73.26 | 68.74 | 61.92 | 49.40 | a | 37.15 | 32.97 | a | 51.38 | ||||||||
1994 | 33.00 | 34.75 | 42.24 | 48.98 | 58.39 | 72.07 | 74.05 | 72.61 | 63.53 | 50.47 | 40.62 | 36.77 | 52.29 | |||||||||||||
1995 | 32.92 | 41.75 | 41.65 | 46.25 | 55.92 | 63.96 | b | 68.21 | 72.69 | 63.48 | 54.60 | 44.92 | 35.02 | 51.78 | ||||||||||||
1996 | 33.13 | 38.22 | 40.55 | 48.60 | a | 64.76 | 70.45 | 71.76 | 68.32 | 60.15 | 50.31 | 41.97 | 35.50 | 51.98 | ||||||||||||
1997 | 26.05 | 34.55 | 43.97 | 45.00 | 58.60 | 65.57 | 71.15 | 69.92 | 67.54 | f | 53.75 | c | 38.92 | 26.27 | 48.52 | a | ||||||||||
1998 | 33.00 | 34.73 | 40.31 | 46.07 | 59.48 | 67.30 | 72.21 | 69.48 | 66.95 | 52.47 | 44.07 | a | 34.00 | a | 51.67 | |||||||||||
1999 | 37.16 | 40.07 | 42.87 | 46.83 | a | 56.74 | 66.15 | 70.39 | 68.42 | 63.12 | 52.97 | 45.25 | 31.63 | 51.80 | ||||||||||||
2000 | 36.40 | 40.98 | 43.62 | w | ----- | z | 63.43 | a | 69.55 | 73.65 | a | 71.69 | 66.00 | a | 51.93 | b | 34.78 | 31.19 | 53.96 | b | ||||||
2001 | 22.77 | 36.93 | 41.84 | 51.95 | a | 60.65 | 69.24 | a | 74.05 | 69.24 | 64.50 | c | 53.39 | 43.28 | 32.78 | a | 51.72 | |||||||||
2002 | 34.98 | 33.31 | a | 41.00 | 54.84 | b | 59.82 | 71.77 | b | 71.26 | 70.53 | 63.74 | a | 50.34 | b | 39.97 | 28.90 | 51.71 | ||||||||
2003 | 38.60 | b | 36.46 | 43.03 | 50.78 | c | 61.11 | 67.70 | 75.48 | 71.90 | 63.50 | b | 56.61 | 42.21 | a | 35.25 | a | 53.55 | ||||||||
2004 | 34.02 | b | 30.64 | 46.72 | a | 48.71 | b | 60.68 | 68.24 | a | 69.92 | 67.34 | 61.70 | b | 51.56 | 40.18 | h | 32.18 | a | 51.97 | a | |||||
2005 | 38.76 | 38.05 | 39.64 | b | 49.50 | 58.29 | 67.23 | 72.48 | 68.11 | 64.38 | 51.82 | 43.45 | 34.29 | 52.17 | ||||||||||||
2006 | 35.02 | 36.09 | 43.27 | 52.34 | a | 62.50 | 71.13 | 72.95 | 68.52 | 58.38 | 51.26 | 42.95 | 30.98 | 52.12 | ||||||||||||
2007 | 21.29 | 35.29 | 44.53 | 47.53 | 56.44 | 66.73 | 71.32 | 73.11 | 65.15 | 52.85 | 41.70 | 32.55 | 50.71 | |||||||||||||
2008 | 29.90 | 36.46 | d | 40.60 | 47.83 | a | 57.50 | a | 71.17 | a | 70.08 | 68.90 | b | 61.12 | 51.89 | 42.75 | 33.71 | e | 50.99 | |||||||
2009 | 35.35 | a | 38.45 | 44.00 | a | 47.72 | 61.23 | 67.84 | a | 73.18 | 70.37 | 61.13 | 50.26 | 42.40 | 28.52 | a | 51.70 | |||||||||
2010 | 30.10 | 31.98 | 39.58 | 51.02 | 56.98 | 71.43 | 71.11 | 70.90 | 67.22 | 54.34 | 40.52 | 37.87 | 51.92 | |||||||||||||
2011 | 31.11 | 28.00 | 46.81 | 52.60 | 56.76 | 71.23 | 75.26 | 74.29 | 63.17 | 51.95 | 41.13 | 22.97 | 51.27 | |||||||||||||
2012 | 34.79 | 34.79 | 44.16 | 53.53 | a | 60.52 | a | 72.70 | 72.68 | 71.66 | 63.72 | 53.15 | a | 43.60 | 33.23 | 53.21 | ||||||||||
2013 | 29.19 | 32.66 | 43.02 | 49.35 | 57.74 | b | 72.05 | 70.73 | 70.50 | 63.77 | 49.66 | b | 39.43 | 31.76 | 50.82 | |||||||||||
2014 | 33.06 | 39.52 | 42.97 | a | 49.17 | 57.05 | 69.67 | 72.69 | 67.95 | 64.10 | 55.15 | 39.57 | c | 34.85 | 52.15 | |||||||||||
2015 | 31.18 | 37.75 | 45.02 | 49.68 | 55.89 | 69.55 | 71.82 | 71.28 | a | 67.70 | 54.42 | 40.73 | 33.81 | 52.40 | ||||||||||||
2016 | 29.37 | 39.91 | 45.42 | a | 49.45 | 55.97 | b | 69.78 | 75.16 | 69.11 | 63.80 | 56.45 | a | 44.34 | a | 35.50 | 52.86 | |||||||||
2017 | 34.80 | a | 42.04 | 48.10 | 49.95 | 56.56 | 69.12 | 73.05 | 68.97 | 64.33 | 53.31 | 47.78 | 36.35 | 53.70 | ||||||||||||
2018 | 33.03 | 38.56 | a | 43.05 | 51.35 | 63.45 | 72.72 | 73.08 | 70.56 | 64.72 | 51.74 | 38.32 | 32.06 | 52.72 | ||||||||||||
2019 | 30.97 | 35.77 | 42.27 | a | 50.82 | 54.85 | 65.93 | 73.47 | 72.87 | a | 66.08 | 49.47 | 39.65 | 34.03 | 51.35 | |||||||||||
2020 | 34.82 | 33.43 | 45.24 | 49.70 | 62.39 | 70.52 | a | 74.95 | 73.52 | 61.33 | 51.69 | 44.27 | 31.35 | 52.77 | ||||||||||||
2021 | 31.98 | 33.77 | 41.31 | 48.29 | a | 59.71 | 70.20 | 71.06 | 70.23 | 66.45 | 51.90 | 44.77 | 38.79 | 52.37 | ||||||||||||
2022 | 33.03 | a | 29.59 | 40.06 | 50.82 | 61.42 | 69.25 | 74.58 | 68.74 | b | 65.47 | 51.24 | 35.91 | a | 35.40 | a | 51.29 | |||||||||
2023 | 34.00 | 35.18 | 40.60 | 46.48 | 59.69 | 66.43 | 77.18 | 72.97 | 66.10 | 54.03 | 41.73 | 35.83 | a | 52.52 | ||||||||||||
2024 | 32.89 | 38.29 | 42.34 | 46.53 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.84 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.06 | 35.38 | 41.73 | 49.19 | 58.15 | 67.96 | 71.70 | 69.57 | 63.09 | 52.21 | 40.63 | 32.20 | 51.15 | |||||||||||||
S.D. | 4.09 | 3.48 | 2.93 | 2.45 | 2.62 | 2.39 | 1.97 | 1.88 | 2.08 | 2.03 | 3.19 | 3.50 | 1.22 | |||||||||||||
SKEW | -0.44 | -0.34 | -0.15 | -0.22 | 0.31 | 0.40 | 0.31 | 0.34 | 0.07 | -0.14 | -0.39 | -0.42 | -0.05 | |||||||||||||
MAX | 38.76 | 42.46 | 48.10 | 54.84 | 64.76 | 73.18 | 77.18 | 74.29 | 67.70 | 56.61 | 47.78 | 38.82 | 53.70 | |||||||||||||
MIN | 21.29 | 23.83 | 34.93 | 42.27 | 52.12 | 63.88 | 67.74 | 66.16 | 58.38 | 47.13 | 33.45 | 22.97 | 48.86 | |||||||||||||
YRS | 68 | 67 | 67 | 65 | 66 | 66 | 68 | 68 | 66 | 67 | 65 | 65 | 57 |