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 | 55.12 | v | 55.48 | 52.81 | d | 47.13 | 36.71 | 19.41 | a | 16.97 | b | 38.09 | f | |||
1957 | 22.28 | b | 28.77 | b | 26.90 | 30.59 | c | 39.57 | c | 49.93 | 56.60 | a | 55.35 | 42.87 | 39.94 | 24.25 | b | 19.74 | d | 36.40 | ||||||
1958 | 17.53 | a | 25.07 | 24.38 | b | 31.77 | 43.13 | a | 50.90 | 55.32 | 54.06 | 50.00 | a | 35.87 | 24.66 | a | 19.03 | 35.98 | ||||||||
1959 | 18.43 | a | 18.46 | 21.58 | 35.26 | c | 40.65 | 50.17 | 53.26 | 54.17 | b | 45.23 | 34.26 | 22.70 | 17.65 | 34.32 | ||||||||||
1960 | 12.74 | 18.85 | b | 26.63 | a | 31.87 | 37.29 | 51.53 | 54.19 | 52.81 | 45.63 | 35.52 | 26.57 | 13.30 | a | 33.91 | ||||||||||
1961 | 10.93 | a | 22.00 | a | 27.23 | a | 30.63 | 41.48 | 50.40 | 51.87 | 54.19 | 45.04 | b | 34.76 | b | 22.87 | 19.38 | b | 34.23 | |||||||
1962 | 17.55 | 24.18 | 21.87 | 35.07 | 40.45 | 46.27 | 54.81 | 51.81 | 50.00 | 39.06 | 27.83 | 21.27 | a | 35.85 | ||||||||||||
1963 | 11.80 | a | 22.07 | a | 24.23 | 34.23 | 42.48 | 48.47 | 54.90 | 54.58 | 48.07 | 38.06 | 26.13 | 12.19 | 34.77 | |||||||||||
1964 | 12.45 | 11.52 | 22.19 | 30.03 | 40.61 | 48.53 | 56.19 | 53.81 | 49.90 | 36.26 | 27.47 | 21.94 | 34.24 | |||||||||||||
1965 | 21.45 | 16.39 | 20.17 | a | 33.70 | 42.42 | 50.53 | 55.26 | 53.37 | a | 47.17 | 35.29 | 29.73 | 21.53 | a | 35.58 | ||||||||||
1966 | 15.32 | 17.07 | a | 25.42 | 32.37 | 41.06 | 51.50 | 58.58 | 53.42 | 47.33 | 33.68 | 28.55 | a | 18.16 | 35.21 | |||||||||||
1967 | 15.94 | 20.93 | 29.84 | 34.67 | 39.90 | 51.27 | 57.06 | 52.23 | 46.50 | r | 36.20 | f | 27.21 | b | 15.77 | 34.48 | b | |||||||||
1968 | 17.27 | a | 23.14 | 25.71 | 28.97 | 40.23 | 49.40 | 55.35 | 53.23 | 43.70 | 35.71 | 26.97 | 15.12 | g | 36.33 | a | ||||||||||
1969 | 25.16 | 20.93 | 21.48 | 35.07 | 41.37 | a | 48.80 | 57.55 | 55.84 | 48.90 | 35.84 | 24.03 | 22.16 | 36.43 | ||||||||||||
1970 | 15.74 | 21.18 | 21.19 | 27.32 | h | 39.68 | 48.28 | a | 57.00 | 54.77 | 46.17 | a | 32.42 | 23.77 | 20.90 | 34.65 | a | |||||||||
1971 | 16.58 | 17.52 | c | 24.58 | 28.60 | 38.68 | 48.97 | 55.84 | 52.71 | 44.73 | 34.23 | 27.13 | 19.31 | b | 34.07 | |||||||||||
1972 | 19.67 | a | 22.07 | 26.68 | 30.87 | 39.32 | 50.50 | 55.00 | 51.68 | 46.97 | 39.19 | 25.14 | b | 19.26 | 35.53 | |||||||||||
1973 | 18.83 | a | 23.75 | 26.19 | 26.87 | 39.58 | 46.83 | a | 54.10 | 52.52 | 43.50 | 34.39 | 27.03 | 17.48 | 34.26 | |||||||||||
1974 | 18.83 | a | 14.96 | b | 27.94 | 29.00 | 43.16 | 53.67 | o | 54.06 | 52.84 | 46.00 | 40.35 | 25.93 | 15.68 | 33.52 | a | |||||||||
1975 | 18.74 | 20.39 | 25.90 | 29.62 | a | 34.55 | 47.80 | 52.39 | 52.42 | 45.76 | a | 33.45 | 24.10 | 19.35 | 33.71 | |||||||||||
1976 | 14.65 | 25.41 | 24.58 | 32.80 | 39.87 | 47.97 | 52.94 | 51.55 | 45.73 | 30.97 | 20.55 | a | 15.45 | b | 33.54 | |||||||||||
1977 | 13.30 | a | 20.61 | 23.58 | 35.07 | 40.71 | 50.77 | 55.07 | a | 56.47 | a | 49.33 | 37.03 | 28.42 | d | 25.48 | h | 37.30 | a | |||||||
1978 | 19.94 | 20.32 | 25.10 | 32.66 | a | 38.24 | f | 52.00 | 56.35 | 52.16 | 46.90 | 37.94 | 31.40 | 17.52 | 35.66 | a | ||||||||||
1979 | 13.94 | 21.71 | 25.97 | 32.00 | 40.77 | 49.27 | 54.42 | 51.55 | 46.90 | 36.19 | 19.97 | 18.10 | 34.23 | |||||||||||||
1980 | 22.03 | b | 22.21 | 24.10 | 29.77 | 38.61 | 51.17 | 55.77 | 52.58 | 49.40 | 32.52 | 22.13 | 23.90 | 35.35 | ||||||||||||
1981 | 17.71 | 21.00 | 25.90 | 35.21 | a | 42.81 | 52.60 | 56.52 | 54.87 | 49.40 | 39.13 | 28.03 | 22.20 | a | 37.11 | |||||||||||
1982 | 20.90 | b | 19.57 | 27.03 | b | 32.53 | 39.13 | 46.72 | e | 56.55 | 56.61 | 49.10 | 33.03 | 25.17 | a | 16.07 | b | 35.20 | ||||||||
1983 | 18.60 | a | 21.74 | a | 28.58 | 28.77 | 35.48 | 46.57 | 54.58 | 54.74 | 50.10 | a | 39.52 | 27.90 | 17.00 | 35.30 | ||||||||||
1984 | 15.94 | 17.38 | 24.26 | 28.00 | 44.10 | a | 50.97 | 55.06 | 55.32 | 46.41 | a | 35.57 | a | 26.53 | 22.17 | a | 35.14 | |||||||||
1985 | 16.39 | 20.44 | a | 28.60 | a | 32.78 | c | 42.10 | 50.83 | a | 53.81 | 53.61 | 46.07 | 37.42 | 28.90 | 18.00 | 35.74 | |||||||||
1986 | 21.71 | 23.15 | a | 28.48 | 34.07 | 41.48 | 50.07 | 53.10 | 53.77 | 45.33 | 35.97 | 24.83 | 18.58 | 35.88 | ||||||||||||
1987 | 15.26 | 21.82 | 22.55 | 29.50 | 39.23 | 48.67 | 52.00 | 53.13 | 44.87 | 37.32 | 23.47 | 16.45 | b | 33.69 | ||||||||||||
1988 | 17.00 | 20.97 | 22.45 | 31.03 | 38.55 | 50.13 | 54.06 | 55.42 | 44.40 | 36.32 | 25.77 | 14.90 | a | 34.25 | ||||||||||||
1989 | 17.94 | 19.39 | 27.87 | 33.63 | 41.97 | 49.30 | 54.84 | 53.13 | 46.00 | 35.42 | 24.73 | 13.26 | 34.79 | |||||||||||||
1990 | 16.03 | 19.71 | 26.77 | 34.40 | 39.68 | 53.33 | 53.61 | 51.65 | 49.33 | 35.19 | 27.27 | 15.84 | 35.24 | |||||||||||||
1991 | 18.26 | 22.04 | a | 25.42 | 31.10 | 40.45 | 47.73 | 54.81 | 54.48 | 46.60 | 34.52 | 24.93 | 18.84 | 34.93 | ||||||||||||
1992 | 12.29 | 24.34 | 26.90 | 34.90 | 41.71 | 47.67 | 52.61 | 52.37 | a | 47.63 | 37.68 | 19.20 | 16.00 | a | 34.44 | |||||||||||
1993 | 24.13 | 24.89 | 25.06 | 31.00 | a | 39.29 | 49.67 | 57.19 | 54.55 | 44.73 | 32.50 | a | 21.53 | 17.40 | a | 35.16 | ||||||||||
1994 | 17.10 | 20.32 | 27.03 | 32.57 | 42.81 | 52.17 | 54.35 | 54.45 | 46.13 | 35.10 | 26.93 | 23.42 | 36.03 | |||||||||||||
1995 | 22.19 | 25.86 | 26.48 | 29.70 | 39.90 | 45.00 | 50.16 | 54.42 | 46.83 | 34.90 | 26.97 | 18.45 | 35.07 | |||||||||||||
1996 | 18.16 | 22.45 | 22.10 | 30.55 | a | 44.87 | 53.20 | 57.13 | 53.81 | 45.43 | 35.97 | 26.50 | 22.13 | 36.02 | ||||||||||||
1997 | 15.65 | 22.00 | 25.32 | 30.77 | 42.29 | 49.67 | 54.61 | 55.39 | 52.29 | f | 37.59 | b | 23.90 | 15.65 | 33.89 | a | ||||||||||
1998 | 22.23 | 22.89 | 25.39 | 29.10 | 40.42 | 47.63 | 56.10 | 53.74 | 49.77 | 38.84 | 29.90 | a | 19.30 | a | 36.27 | |||||||||||
1999 | 22.35 | 23.36 | 27.06 | 30.31 | a | 40.16 | 48.70 | 55.55 | 54.10 | 47.43 | 35.06 | 25.80 | 16.58 | 35.54 | ||||||||||||
2000 | 20.06 | 24.34 | 27.12 | w | ----- | z | 43.97 | a | 53.47 | 56.06 | 54.26 | 46.62 | a | 38.45 | b | 22.40 | 16.58 | 37.62 | b | |||||||
2001 | 11.13 | 24.04 | 28.52 | 33.40 | 43.10 | 51.07 | a | 58.32 | 54.06 | 45.93 | b | 34.58 | 29.77 | 18.00 | 35.99 | |||||||||||
2002 | 20.10 | 17.37 | a | 21.74 | 35.90 | a | 40.16 | 52.07 | b | 56.29 | 53.90 | 48.28 | a | 34.50 | a | 24.33 | 18.55 | 35.27 | ||||||||
2003 | 21.72 | b | 22.64 | 27.00 | 32.43 | b | 43.03 | 50.73 | 57.68 | 56.23 | 46.76 | a | 39.71 | 26.63 | 19.97 | 37.04 | ||||||||||
2004 | 19.27 | a | 17.52 | 32.19 | 34.79 | b | 42.61 | 49.10 | 54.55 | 52.13 | 44.30 | 37.06 | 26.64 | h | 17.97 | a | 36.50 | a | ||||||||
2005 | 24.77 | 26.39 | 24.90 | b | 31.97 | 40.87 | 48.57 | 54.61 | 53.84 | 47.73 | 36.77 | 26.50 | 17.06 | 36.17 | ||||||||||||
2006 | 17.42 | 16.54 | 26.45 | 32.59 | a | 43.77 | 53.13 | 58.10 | 56.65 | 43.40 | 35.74 | 24.33 | 18.55 | 35.56 | ||||||||||||
2007 | 9.97 | 21.86 | 26.65 | 30.67 | 41.23 | 48.17 | 53.68 | 56.03 | 48.27 | 32.97 | 23.87 | 19.03 | 34.36 | |||||||||||||
2008 | 14.97 | 20.76 | d | 21.45 | 28.70 | 39.81 | 51.66 | a | 56.52 | 54.55 | b | 44.63 | 34.84 | 26.20 | 19.65 | e | 34.48 | |||||||||
2009 | 18.81 | 19.29 | 26.93 | a | 29.60 | 44.29 | 51.55 | a | 56.45 | 53.10 | 45.57 | 35.13 | 24.27 | 16.74 | 35.14 | |||||||||||
2010 | 16.13 | 20.25 | 24.61 | 35.27 | 39.65 | 53.73 | 56.97 | 54.39 | 49.87 | 38.39 | 23.97 | 22.13 | 36.28 | |||||||||||||
2011 | 15.71 | 11.68 | 28.06 | 34.27 | 39.29 | 52.37 | 58.74 | 59.29 | 46.70 | 34.42 | 25.73 | 12.74 | 34.92 | |||||||||||||
2012 | 22.23 | 20.79 | 25.48 | 35.00 | a | 44.17 | a | 53.97 | 56.94 | 55.26 | 47.00 | 33.81 | 24.43 | 18.45 | 36.46 | |||||||||||
2013 | 13.74 | 16.82 | 24.90 | 30.73 | 39.34 | b | 53.60 | 56.48 | 54.39 | 49.30 | 31.69 | b | 25.37 | 18.06 | 34.54 | |||||||||||
2014 | 15.39 | 22.71 | 24.90 | 30.93 | 39.97 | 51.97 | 58.06 | 54.32 | 51.17 | 38.39 | 21.93 | a | 20.10 | 35.82 | ||||||||||||
2015 | 19.45 | 22.64 | 26.81 | 32.40 | 41.23 | 53.20 | 56.52 | 55.40 | a | 51.27 | 40.52 | 25.20 | 20.68 | 37.11 | ||||||||||||
2016 | 17.10 | 22.34 | 26.29 | 33.20 | 39.10 | a | 52.00 | 56.87 | 54.74 | 48.73 | 37.52 | 29.40 | 21.87 | 36.60 | ||||||||||||
2017 | 23.23 | a | 25.93 | 27.87 | 32.27 | 38.45 | 50.80 | 57.10 | 54.23 | 47.77 | 35.81 | 30.13 | 18.65 | 36.85 | ||||||||||||
2018 | 13.87 | 20.64 | 25.16 | 31.17 | 45.10 | 54.33 | 57.10 | 54.68 | 47.87 | 38.13 | 23.47 | 17.90 | 35.78 | |||||||||||||
2019 | 19.29 | 21.18 | 25.48 | 35.17 | 38.26 | 48.40 | 56.26 | 55.73 | a | 49.47 | 31.16 | 23.63 | 20.61 | 35.39 | ||||||||||||
2020 | 20.35 | 19.14 | 30.35 | 31.17 | 43.13 | 51.34 | a | 58.13 | 55.32 | 43.60 | 32.00 | 27.27 | 14.65 | 35.54 | ||||||||||||
2021 | 17.00 | 17.96 | 24.19 | 30.79 | a | 42.26 | 54.60 | 56.97 | 54.84 | 49.30 | 33.55 | 25.97 | 22.16 | 35.80 | ||||||||||||
2022 | 16.23 | 12.57 | 21.74 | 30.97 | 41.81 | 54.40 | 59.06 | 55.77 | a | 48.00 | 37.61 | 20.97 | a | 20.81 | 34.99 | |||||||||||
2023 | 20.26 | 20.18 | 24.06 | 26.83 | 42.90 | 48.93 | 60.10 | 57.23 | 48.90 | 35.26 | 26.00 | 22.48 | 36.09 | |||||||||||||
2024 | 18.77 | 23.34 | 27.90 | 29.43 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.34 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 17.76 | 20.91 | 25.53 | 31.87 | 40.90 | 50.38 | 55.64 | 54.16 | 47.10 | 35.89 | 25.43 | 18.51 | 35.34 | |||||||||||||
S.D. | 3.45 | 3.30 | 2.39 | 2.28 | 2.08 | 2.22 | 1.89 | 1.50 | 2.05 | 2.31 | 2.63 | 2.65 | 0.91 | |||||||||||||
SKEW | -0.06 | -0.65 | -0.05 | -0.09 | -0.32 | -0.06 | -0.29 | 0.49 | -0.01 | -0.01 | -0.21 | -0.17 | -0.01 | |||||||||||||
MAX | 25.16 | 28.77 | 32.19 | 35.90 | 45.10 | 54.60 | 60.10 | 59.29 | 51.27 | 40.52 | 31.40 | 23.90 | 37.11 | |||||||||||||
MIN | 9.97 | 11.52 | 20.17 | 26.83 | 34.55 | 45.00 | 50.16 | 51.55 | 42.87 | 30.97 | 19.20 | 12.19 | 33.54 | |||||||||||||
YRS | 68 | 68 | 67 | 65 | 66 | 66 | 68 | 68 | 66 | 67 | 67 | 66 | 58 |