YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.03 | 27.81 | d | 24.19 | 28.68 | i | ||
1981 | 18.26 | 17.64 | 26.97 | 39.47 | 42.71 | 55.23 | 60.19 | 56.29 | 49.77 | 37.16 | 28.37 | 16.19 | 37.35 | |||||||||||||
1982 | 12.74 | d | 14.63 | a | 24.13 | a | 31.93 | 43.00 | 49.90 | 58.03 | 58.90 | 50.23 | 34.97 | 21.90 | 17.77 | a | 34.85 | |||||||||
1983 | 19.97 | a | 22.13 | e | 25.68 | 29.60 | 39.72 | b | 51.07 | 58.48 | 60.83 | a | 50.00 | 38.58 | 26.13 | 8.13 | 35.86 | |||||||||
1984 | 11.55 | 22.88 | d | 24.32 | 31.20 | 44.60 | a | 52.80 | 59.06 | 59.45 | 46.07 | 40.83 | y | ----- | z | ----- | z | 39.10 | c | |||||||
1985 | ----- | z | ----- | z | ----- | z | 38.90 | i | 46.37 | a | 51.34 | a | 59.17 | b | 55.73 | a | 45.86 | a | 33.52 | 19.55 | a | 14.36 | i | 44.51 | e | |
1986 | 23.03 | 20.93 | 30.13 | 37.69 | d | 42.00 | a | 55.24 | a | 58.74 | 56.10 | k | 46.60 | j | 36.07 | b | 23.14 | a | 17.77 | 34.47 | b | |||||
1987 | 16.67 | a | 22.36 | 23.35 | 34.93 | 46.84 | 53.71 | b | 56.66 | b | 55.74 | 47.20 | 34.20 | a | 26.67 | 17.10 | 36.29 | |||||||||
1988 | 7.13 | 17.45 | 23.39 | 32.17 | 43.55 | 55.81 | c | 57.81 | d | 58.03 | 46.97 | 37.52 | 24.97 | 16.23 | 35.08 | |||||||||||
1989 | 16.65 | 10.61 | 25.23 | 33.97 | a | 45.03 | 50.47 | 57.65 | 56.67 | a | 46.43 | 34.42 | 23.67 | 12.16 | 34.41 | |||||||||||
1990 | 16.90 | a | 17.57 | 26.19 | 34.27 | 41.07 | a | 55.10 | 56.55 | 55.71 | 51.73 | 35.43 | a | 26.48 | a | 9.97 | 35.58 | |||||||||
1991 | 14.65 | e | 22.54 | b | 26.14 | c | 33.90 | 44.69 | b | 54.21 | a | 56.38 | o | 56.90 | 46.97 | a | 33.40 | a | 22.10 | 19.69 | b | 34.11 | a | |||
1992 | 19.53 | a | 25.18 | a | 29.10 | 35.87 | 45.23 | 49.44 | e | 55.29 | g | 54.48 | b | 46.20 | 35.76 | b | 21.57 | 12.68 | 34.09 | a | ||||||
1993 | 10.65 | 16.44 | a | 27.10 | 32.69 | a | 43.24 | b | 50.96 | b | 57.29 | 56.55 | 44.14 | a | 34.10 | 19.37 | 19.73 | a | 34.35 | |||||||
1994 | 16.80 | f | 18.83 | j | 27.84 | 32.24 | a | 46.13 | a | 56.41 | c | 54.44 | m | 59.08 | g | 49.40 | 37.35 | 24.70 | 20.27 | a | 36.79 | d | ||||
1995 | 17.57 | a | 19.79 | 25.71 | 29.23 | 40.48 | 51.07 | 56.50 | c | 57.90 | a | 47.57 | 32.13 | a | 24.83 | 16.71 | 34.96 | |||||||||
1996 | 10.23 | 15.90 | 20.35 | 33.62 | a | 45.97 | 53.71 | b | 58.13 | 55.30 | a | 46.57 | 33.73 | a | 21.28 | a | 15.53 | a | 34.19 | |||||||
1997 | 12.33 | a | 17.74 | a | 23.89 | c | 27.00 | b | 40.24 | b | 51.83 | f | 55.59 | d | 56.35 | e | 49.04 | e | 35.38 | e | 22.59 | a | 16.97 | b | 32.47 | a |
1998 | 19.13 | 23.71 | d | 23.07 | d | 31.93 | c | 44.62 | b | 48.35 | j | 61.00 | j | 56.72 | f | 51.41 | a | 36.20 | a | 28.03 | 14.69 | b | 30.31 | c | ||
1999 | 19.76 | b | 21.20 | c | 26.55 | b | 32.27 | d | 39.93 | c | 49.95 | h | 59.40 | k | 57.41 | b | 44.31 | d | 33.79 | b | 28.43 | b | 19.39 | 32.30 | b | |
2000 | 16.67 | d | 21.88 | e | 27.39 | 31.04 | d | 42.60 | f | 50.92 | f | 59.16 | f | 58.81 | e | 47.52 | a | 37.07 | a | 18.72 | a | 13.26 | 30.26 | c | ||
2001 | 16.63 | a | 18.48 | e | 27.03 | 37.00 | f | 45.77 | i | 56.05 | k | 55.95 | l | ----- | z | ----- | z | ----- | z | ----- | z | 19.03 | b | 20.29 | h | |
2002 | 15.70 | a | 16.64 | c | 17.81 | 32.97 | 32.23 | 46.68 | h | 54.00 | x | ----- | z | ----- | z | 27.67 | s | 25.61 | b | 19.03 | 22.85 | e | ||||
2003 | 20.94 | 15.79 | 27.68 | 36.00 | 43.07 | c | 51.22 | g | 60.45 | 57.65 | h | 44.21 | b | 38.47 | a | 22.32 | e | 15.74 | h | 34.32 | c | |||||
2004 | 15.70 | d | 16.62 | 30.10 | b | 34.12 | d | 45.17 | b | 51.13 | 56.27 | i | 53.00 | 46.57 | b | 36.87 | 25.96 | b | 18.65 | 33.99 | a | |||||
2005 | 19.89 | c | 21.82 | 24.85 | e | 33.04 | c | 40.00 | i | 52.42 | d | 57.47 | a | 56.55 | b | 49.43 | 37.44 | d | 27.61 | g | 15.55 | 36.85 | b | |||
2006 | 18.87 | 14.14 | 22.84 | 32.46 | f | 44.35 | 54.77 | 60.17 | a | 57.62 | b | 42.80 | 35.42 | 24.67 | f | 18.16 | 36.91 | b | ||||||||
2007 | 10.39 | 17.25 | 30.06 | 30.71 | b | 43.84 | 52.00 | f | 58.13 | p | 59.79 | b | 48.17 | 35.58 | 24.57 | 13.29 | 31.37 | b | ||||||||
2008 | 11.94 | 16.48 | b | 24.10 | a | 28.83 | 40.34 | b | 50.63 | 58.90 | 56.52 | d | ----- | z | 35.19 | e | 27.87 | 14.45 | 33.21 | a | ||||||
2009 | 17.16 | 20.75 | 24.55 | 31.77 | 44.48 | 52.63 | 56.35 | 54.43 | a | 46.37 | 28.83 | a | 27.60 | 11.13 | 34.67 | |||||||||||
2010 | 16.77 | 16.43 | 26.62 | b | 33.55 | a | 39.00 | c | 54.90 | 59.06 | 56.97 | a | 48.45 | a | 36.90 | 22.21 | b | 18.71 | 35.80 | |||||||
2011 | 13.32 | 10.68 | c | 24.97 | a | 32.10 | 39.19 | 53.52 | a | 60.97 | b | 60.30 | a | 48.13 | 33.87 | a | 22.90 | 13.94 | 34.49 | |||||||
2012 | 19.06 | 17.04 | b | 29.48 | b | 36.77 | 42.50 | a | 56.71 | i | 62.03 | 55.80 | a | 49.27 | 32.48 | 22.32 | e | 16.50 | a | 34.84 | a | |||||
2013 | 12.87 | 15.50 | 23.92 | s | 28.28 | a | 42.90 | 54.85 | c | 57.43 | x | 58.03 | a | 51.97 | 33.48 | 19.65 | d | 13.50 | c | 33.10 | b | |||||
2014 | ----- | z | ----- | z | ----- | z | ----- | z | 43.79 | g | 52.43 | 57.97 | b | 54.94 | 47.53 | 38.29 | 18.41 | c | 16.00 | 40.80 | e | |||||
2015 | 17.65 | 18.46 | 26.94 | 33.70 | 41.20 | a | 55.40 | 57.43 | a | 55.73 | a | 49.38 | a | 39.42 | 22.79 | b | 17.00 | 36.26 | ||||||||
2016 | 15.70 | a | 21.10 | 24.87 | a | 31.87 | 39.65 | 54.48 | a | 57.90 | 54.45 | 48.03 | 37.35 | 27.18 | b | 9.61 | 35.18 | |||||||||
2017 | 15.35 | 22.54 | 27.29 | 33.47 | 40.77 | 52.37 | 58.66 | b | 54.29 | 47.60 | 33.77 | 26.90 | 14.68 | c | 35.64 | |||||||||||
2018 | 14.97 | 12.79 | 24.00 | 28.70 | 47.48 | 55.31 | a | 58.43 | a | 54.56 | d | 48.83 | 34.48 | 23.52 | e | 16.42 | 34.96 | |||||||||
2019 | 15.90 | 11.07 | 22.48 | 32.90 | 38.81 | 50.57 | 59.84 | 58.71 | 53.20 | 28.65 | 22.07 | 20.52 | 34.56 | |||||||||||||
2020 | 17.10 | 15.59 | 27.77 | 30.24 | a | 44.13 | 55.13 | 60.48 | 58.87 | 46.67 | 31.23 | 27.87 | 18.84 | 36.16 | ||||||||||||
2021 | 18.40 | a | 12.11 | 26.26 | 30.63 | 43.84 | 54.93 | a | 58.87 | 57.22 | d | 51.10 | a | 36.55 | 27.64 | b | 20.68 | c | 36.52 | |||||||
2022 | 15.06 | 12.00 | a | 22.71 | 31.37 | 42.39 | 54.00 | 61.45 | 58.03 | a | 49.73 | 37.45 | 21.17 | 11.97 | 34.78 | |||||||||||
2023 | 16.90 | 16.11 | 20.26 | 30.33 | 45.57 | a | 52.03 | a | 58.58 | 58.19 | 49.67 | 36.26 | 25.33 | 21.03 | 35.86 | |||||||||||
2024 | 13.26 | 22.76 | 25.06 | 32.59 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.36 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.93 | 17.87 | 25.47 | 32.47 | 42.73 | 53.18 | 58.59 | 56.89 | 48.06 | 35.19 | 24.10 | 16.27 | 35.35 | |||||||||||||
S.D. | 3.33 | 3.86 | 2.70 | 2.60 | 2.94 | 1.97 | 1.54 | 1.85 | 2.30 | 2.40 | 2.95 | 3.47 | 0.83 | |||||||||||||
SKEW | -0.43 | -0.12 | -0.46 | 0.38 | -1.10 | -0.24 | 0.28 | 0.12 | -0.03 | -0.76 | -0.18 | -0.29 | 0.56 | |||||||||||||
MAX | 23.03 | 25.18 | 30.13 | 39.47 | 47.48 | 56.41 | 62.03 | 60.83 | 53.20 | 39.42 | 28.43 | 24.19 | 37.35 | |||||||||||||
MIN | 7.13 | 10.61 | 17.81 | 27.00 | 32.23 | 49.44 | 55.59 | 53.00 | 42.80 | 28.65 | 18.41 | 8.13 | 34.19 | |||||||||||||
YRS | 41 | 41 | 41 | 39 | 39 | 34 | 32 | 37 | 39 | 41 | 40 | 41 | 22 |