YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.45 | 61.29 | 56.57 | 45.71 | 35.07 | 27.68 | 48.29 | f | ||||||
1963 | 15.42 | 27.89 | 32.48 | 43.77 | 53.10 | 59.73 | 65.16 | 62.94 | 56.60 | 47.65 | 32.00 | 19.00 | 42.98 | |||||||||||||
1964 | 19.23 | 18.31 | 26.03 | 38.87 | 50.84 | 58.20 | 65.06 | 62.42 | 55.80 | 42.32 | 32.80 | 24.35 | 41.19 | |||||||||||||
1965 | 26.06 | 21.79 | 24.06 | 42.70 | 51.81 | 59.27 | 63.71 | 60.16 | 52.50 | 41.10 | 36.20 | 27.77 | 42.26 | |||||||||||||
1966 | 15.45 | 20.89 | 32.13 | 39.77 | 49.55 | 59.70 | 65.90 | 60.87 | 55.43 | 40.19 | 33.63 | 20.74 | 41.19 | |||||||||||||
1967 | 23.26 | 23.14 | 36.74 | 45.30 | 46.42 | 59.63 | 63.19 | 60.00 | 53.43 | 41.81 | 31.30 | 23.00 | 42.27 | |||||||||||||
1968 | 26.13 | 25.34 | 32.94 | 39.17 | 47.97 | 58.87 | 62.81 | 62.32 | 52.53 | 43.77 | 32.83 | 21.74 | 42.20 | |||||||||||||
1969 | 24.74 | 27.54 | 26.84 | 43.30 | 51.87 | 57.00 | 65.74 | 64.13 | 57.30 | 41.19 | 30.40 | 25.81 | 42.99 | |||||||||||||
1970 | 19.90 | a | 27.79 | 28.65 | 38.33 | 50.58 | 57.27 | 64.06 | 62.16 | 54.03 | 38.13 | 30.70 | 26.06 | 41.47 | ||||||||||||
1971 | 21.58 | 23.25 | 28.74 | 39.87 | 47.29 | 60.40 | 62.68 | 59.19 | 52.80 | 43.58 | 33.87 | 27.06 | 41.69 | |||||||||||||
1972 | 20.71 | 24.45 | 34.48 | 42.87 | 50.39 | 59.60 | 61.87 | 60.13 | 56.23 | 44.19 | 27.47 | 21.03 | 41.95 | |||||||||||||
1973 | 22.13 | 25.64 | 33.48 | 35.70 | 47.58 | 57.60 | 62.13 | 60.48 | 53.73 | 45.19 | 33.30 | 23.10 | 41.67 | |||||||||||||
1974 | 22.13 | 24.25 | 36.71 | 40.47 | 54.32 | 58.20 | 63.39 | 60.13 | 50.50 | 46.13 | 32.87 | 23.19 | 42.69 | |||||||||||||
1975 | 23.94 | 23.57 | 28.84 | 37.83 | 47.45 | 57.47 | 61.61 | 60.94 | 51.37 | 42.68 | 29.47 | 25.06 | 40.85 | |||||||||||||
1976 | 19.77 | 31.52 | 32.26 | 44.53 | 47.06 | 57.80 | 61.55 | 60.10 | 55.03 | 36.81 | 27.10 | 21.29 | 41.24 | |||||||||||||
1977 | 18.06 | 27.71 | 30.81 | 43.73 | 54.61 | 60.97 | 64.13 | 64.13 | 56.27 | 45.29 | 32.13 | 26.03 | 43.66 | |||||||||||||
1978 | 19.26 | 22.75 | 32.71 | 43.20 | 50.52 | 61.83 | 64.87 | a | 60.65 | 55.13 | 43.39 | 36.30 | 21.16 | 42.65 | ||||||||||||
1979 | 16.45 | 24.61 | 32.06 | 41.87 | 49.26 | 57.31 | a | 63.58 | 59.42 | 55.03 | 43.35 | 28.23 | 24.77 | 41.33 | ||||||||||||
1980 | 23.48 | 26.59 | 29.32 | 37.83 | a | 49.27 | a | 62.83 | 65.26 | 62.13 | 55.37 | 40.61 | 29.43 | 27.77 | 42.49 | |||||||||||
1981 | 24.97 | 25.00 | 34.26 | 44.40 | 49.53 | a | 60.07 | 64.29 | 61.58 | 55.20 | 44.42 | 35.20 | 24.90 | 43.65 | ||||||||||||
1982 | 21.68 | 23.04 | c | 32.60 | a | 37.57 | i | 48.56 | d | 56.33 | c | 62.26 | 61.30 | a | 55.76 | e | 40.45 | i | 30.62 | i | 24.20 | k | 45.19 | d | ||
1983 | 22.14 | j | 25.48 | g | 32.45 | k | 33.73 | h | 43.81 | j | 54.75 | j | 62.04 | e | 61.69 | e | 57.68 | h | 46.85 | k | 34.38 | n | 15.71 | 46.48 | i | |
1984 | 18.67 | d | 22.75 | a | 28.03 | a | 35.58 | d | 49.52 | d | 60.21 | f | 60.81 | 61.20 | a | 50.79 | a | 42.17 | b | 31.62 | a | 25.78 | d | 38.81 | a | |
1985 | 20.21 | b | 21.93 | 33.15 | d | 41.08 | e | 48.64 | c | 57.50 | d | 59.60 | a | 61.31 | b | 53.52 | a | 42.32 | 29.70 | c | 18.63 | a | 40.63 | |||
1986 | 24.03 | a | 25.68 | 33.23 | a | 40.97 | 48.21 | c | 57.67 | 62.03 | 59.61 | 54.67 | 42.39 | 27.93 | 24.35 | 41.73 | ||||||||||
1987 | 19.26 | 28.32 | 26.20 | a | 33.20 | 48.86 | b | 58.07 | 61.43 | a | 60.71 | 52.07 | b | 39.29 | 27.53 | 18.35 | 39.44 | |||||||||
1988 | 16.58 | 19.03 | 25.13 | 34.87 | 46.10 | 58.63 | 62.26 | 62.55 | 52.70 | 43.29 | 31.43 | 22.16 | 39.56 | |||||||||||||
1989 | 24.00 | 22.57 | 32.71 | 41.73 | 51.19 | 55.93 | 57.06 | 61.00 | 51.83 | 40.68 | 29.40 | 17.13 | 40.44 | |||||||||||||
1990 | 21.90 | 24.89 | 32.55 | 40.30 | 47.32 | 62.79 | b | 61.42 | 59.84 | 57.47 | 40.79 | b | 32.53 | 17.74 | 41.63 | |||||||||||
1991 | 20.55 | 26.54 | 32.32 | 39.63 | 51.55 | 59.30 | 62.39 | 61.71 | 52.87 | 40.94 | 28.45 | a | 26.61 | 41.90 | ||||||||||||
1992 | 24.35 | 28.52 | 33.61 | 42.73 | 49.71 | 55.66 | a | 61.52 | b | 59.06 | 53.80 | 41.58 | 27.28 | a | 22.23 | 41.67 | ||||||||||
1993 | 22.65 | 23.18 | 30.19 | 38.07 | 49.94 | 58.00 | 64.71 | 62.07 | a | 51.80 | 40.39 | 26.33 | 23.77 | 40.92 | ||||||||||||
1994 | 20.28 | b | 21.79 | 33.03 | 38.90 | 51.52 | 61.57 | 62.77 | 61.93 | a | 53.62 | a | 42.52 | 31.77 | 26.67 | a | 42.20 | |||||||||
1995 | 25.42 | 28.32 | 32.00 | 37.79 | a | 47.58 | 57.04 | b | 62.11 | c | 63.50 | a | 54.00 | b | 40.07 | b | 32.13 | 25.71 | 42.14 | |||||||
1996 | 19.45 | 26.97 | 27.87 | 38.34 | a | 54.16 | 60.60 | 64.74 | 62.06 | 53.03 | a | 42.55 | b | 30.70 | 23.23 | 41.98 | ||||||||||
1997 | 21.86 | b | 24.27 | b | 31.93 | a | 35.79 | b | 49.30 | a | 59.66 | a | 63.72 | b | 61.94 | 57.40 | 42.50 | a | 30.10 | 22.06 | 41.71 | |||||
1998 | 26.38 | b | 28.11 | a | 29.33 | a | 38.24 | a | 51.77 | 59.34 | a | 65.29 | 61.00 | a | 57.48 | a | 47.47 | a | 36.50 | 25.23 | a | 43.85 | ||||
1999 | 26.10 | 29.82 | 33.13 | 38.67 | 49.03 | 59.59 | a | 64.27 | a | 62.55 | 53.19 | c | 41.19 | 32.66 | a | 24.74 | 42.91 | |||||||||
2000 | 24.29 | 29.41 | 32.68 | 40.73 | 52.32 | 60.76 | a | 64.62 | b | 64.03 | a | 54.73 | 46.23 | 27.33 | 21.10 | a | 43.19 | |||||||||
2001 | 24.06 | 29.07 | 34.10 | b | 43.70 | 52.50 | a | 60.45 | a | 67.13 | 62.55 | 54.00 | 41.35 | 37.07 | 26.23 | 44.35 | ||||||||||
2002 | 25.81 | 23.15 | a | 27.16 | 43.20 | 48.65 | 62.67 | 64.23 | 64.42 | 56.47 | 43.65 | 31.80 | 25.00 | 43.02 | ||||||||||||
2003 | 25.39 | 24.68 | 34.16 | 40.77 | 50.97 | 59.23 | 65.94 | 64.42 | 53.17 | 45.23 | 33.23 | 23.97 | 43.43 | |||||||||||||
2004 | 24.32 | 22.59 | 40.32 | 43.63 | 52.35 | 59.00 | 62.45 | 60.00 | 54.83 | 44.58 | 33.17 | 25.35 | 43.55 | |||||||||||||
2005 | 29.52 | 32.89 | 33.32 | 40.57 | 50.97 | 60.31 | a | 61.90 | 61.84 | 57.57 | 44.45 | 31.10 | 21.48 | 43.83 | ||||||||||||
2006 | 24.65 | 22.11 | 33.81 | 42.73 | 53.06 | 61.43 | 65.19 | 63.58 | 52.27 | 43.81 | 32.03 | 22.33 | a | 43.08 | ||||||||||||
2007 | 18.42 | 23.33 | a | 35.65 | 36.34 | a | 49.23 | 56.50 | 61.23 | 64.26 | 57.43 | 43.68 | 30.07 | 24.19 | 41.69 | |||||||||||
2008 | 19.74 | 23.83 | 30.23 | 36.83 | 48.32 | 59.20 | 63.00 | 61.58 | 53.10 | 41.84 | 30.90 | 22.74 | 40.94 | |||||||||||||
2009 | 19.97 | 27.46 | 32.52 | 36.80 | 49.71 | 60.33 | 62.87 | 62.19 | 52.17 | a | 40.52 | 32.00 | 18.65 | 41.27 | ||||||||||||
2010 | 20.71 | 23.00 | 30.94 | 40.47 | 48.84 | 62.73 | 64.06 | 63.23 | 58.27 | 44.77 | a | 29.10 | 26.00 | 42.68 | ||||||||||||
2011 | 17.61 | 17.50 | 33.32 | 40.90 | 47.45 | 62.73 | 67.84 | 68.32 | 54.63 | 42.07 | a | 31.17 | 23.55 | 42.26 | ||||||||||||
2012 | 24.39 | 25.59 | 35.55 | 44.73 | 51.94 | 62.17 | 65.10 | 63.48 | 54.17 | 42.00 | 32.80 | 23.58 | 43.79 | |||||||||||||
2013 | 21.19 | 22.39 | 29.39 | 33.77 | 48.68 | 61.77 | 63.16 | 63.06 | 58.57 | 40.16 | 30.03 | 22.06 | 41.19 | |||||||||||||
2014 | 18.29 | 23.18 | 27.74 | 37.47 | 48.26 | 60.20 | 63.29 | 61.90 | 57.90 | 45.19 | 26.17 | 24.94 | 41.21 | |||||||||||||
2015 | 22.23 | 24.89 | 31.06 | 39.17 | 48.23 | 61.23 | 65.13 | 62.84 | 60.77 | 48.39 | 31.50 | 27.35 | 43.57 | |||||||||||||
2016 | 23.35 | 26.83 | 33.71 | 38.77 | 46.68 | 60.47 | 65.16 | 61.29 | 56.60 | 46.35 | 34.83 | 22.39 | 43.04 | |||||||||||||
2017 | 24.13 | 29.93 | 35.32 | 41.80 | 46.39 | 59.63 | 64.23 | 61.03 | 55.37 | 43.68 | 36.07 | 22.42 | 43.33 | |||||||||||||
2018 | 18.32 | 23.61 | 33.13 | 35.53 | 54.42 | 61.83 | 64.19 | 62.23 | 55.90 | 44.45 | 28.00 | 23.26 | 42.07 | |||||||||||||
2019 | 22.97 | 24.25 | 29.45 | 39.53 | 47.23 | 57.33 | 63.42 | 65.61 | 61.77 | 38.00 | 27.97 | 26.65 | 42.01 | |||||||||||||
2020 | 24.84 | 22.69 | 36.84 | 37.13 | 48.94 | 60.33 | 65.35 | 63.55 | 49.83 | 38.16 | 34.77 | 22.39 | 42.07 | |||||||||||||
2021 | 22.74 | 18.29 | 31.48 | 37.73 | 51.23 | 61.73 | 63.68 | 63.39 | 57.97 | 45.03 | 33.50 | 29.81 | 43.05 | |||||||||||||
2022 | 18.23 | 17.18 | 27.45 | 39.47 | 51.13 | 62.27 | 67.58 | 64.39 | 57.83 | 45.71 | 31.10 | 24.26 | 42.22 | |||||||||||||
2023 | 25.55 | 26.04 | 31.19 | 37.20 | 51.71 | 59.53 | 66.03 | 65.61 | 59.27 | 45.84 | 34.50 | 28.13 | 44.22 | |||||||||||||
2024 | 20.77 | 31.17 | 33.61 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.52 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.93 | 24.80 | 31.72 | 39.80 | 49.86 | 59.58 | 63.58 | 62.08 | 54.94 | 42.88 | 31.44 | 23.60 | 42.21 | |||||||||||||
S.D. | 3.07 | 3.38 | 3.13 | 2.94 | 2.18 | 1.91 | 1.89 | 1.76 | 2.50 | 2.50 | 2.74 | 2.93 | 1.09 | |||||||||||||
SKEW | -0.12 | 0.01 | -0.20 | -0.09 | 0.36 | -0.07 | -0.41 | 0.79 | 0.34 | -0.12 | 0.03 | -0.49 | -0.20 | |||||||||||||
MAX | 29.52 | 32.89 | 40.32 | 45.30 | 54.61 | 62.83 | 67.84 | 68.32 | 61.77 | 48.39 | 37.07 | 29.81 | 44.35 | |||||||||||||
MIN | 15.42 | 17.18 | 24.06 | 33.20 | 46.10 | 55.66 | 57.06 | 59.06 | 49.83 | 36.81 | 26.17 | 15.71 | 39.44 | |||||||||||||
YRS | 61 | 61 | 61 | 59 | 60 | 59 | 62 | 62 | 61 | 60 | 60 | 61 | 58 |