YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 23.43 | g | 14.68 | 14.68 | k | |
1969 | 18.16 | 11.89 | ----- | z | 22.87 | 30.13 | 35.93 | 43.84 | 46.13 | 39.17 | a | 26.58 | 23.83 | 20.03 | 28.96 | a | ||||||||||
1970 | 20.87 | 20.14 | 19.84 | 19.47 | 31.19 | 37.53 | 44.68 | 41.61 | 33.77 | 29.23 | 25.57 | 12.32 | 28.02 | |||||||||||||
1971 | 13.94 | 14.79 | 19.13 | 22.37 | 29.94 | 37.57 | g | 45.58 | 45.55 | 35.57 | 24.71 | 18.73 | 7.19 | 25.23 | a | |||||||||||
1972 | 12.48 | 15.10 | 24.84 | 25.57 | 31.26 | 40.96 | f | ----- | z | 43.07 | q | 30.82 | h | 27.07 | b | 17.13 | 9.29 | 20.34 | d | |||||||
1973 | 9.33 | a | 16.86 | 15.45 | 23.57 | 32.00 | 39.53 | 43.81 | 43.52 | 36.57 | 29.45 | 20.90 | 19.16 | 27.51 | ||||||||||||
1974 | 13.87 | 13.00 | 22.00 | 22.63 | 31.87 | 40.13 | 44.65 | 41.77 | 40.43 | 29.97 | 23.30 | 14.58 | 28.18 | |||||||||||||
1975 | 15.06 | 15.21 | 16.26 | 16.57 | 28.29 | 37.50 | 43.52 | 39.87 | 40.33 | 28.00 | 22.30 | 17.35 | 26.69 | |||||||||||||
1976 | 16.77 | 17.28 | 16.77 | 22.17 | 34.19 | 37.13 | 44.45 | 38.23 | 39.53 | 30.26 | 26.47 | 18.94 | 28.52 | |||||||||||||
1977 | 14.97 | 20.00 | 15.35 | 27.47 | 27.74 | 41.80 | 43.00 | 45.26 | 36.07 | 31.45 | 25.07 | a | 24.52 | 29.39 | ||||||||||||
1978 | 18.73 | a | 17.43 | 20.68 | 24.47 | 29.03 | 36.07 | 39.77 | 41.94 | 36.20 | 32.61 | 18.40 | 11.06 | 27.20 | ||||||||||||
1979 | 11.42 | 14.11 | 19.17 | b | 23.10 | ----- | z | 36.66 | a | 42.83 | a | 38.17 | a | 34.80 | 27.71 | 22.03 | 20.81 | 26.44 | a | |||||||
1980 | 20.03 | a | 20.59 | 18.58 | 24.13 | 28.61 | 34.03 | 41.84 | 39.55 | b | 33.97 | 28.97 | 21.73 | 20.16 | 27.68 | |||||||||||
1981 | 19.10 | a | 17.18 | 20.55 | 27.23 | 32.06 | 42.70 | 43.00 | 44.23 | 38.97 | a | 26.03 | a | 24.70 | 21.19 | 29.75 | ||||||||||
1982 | 11.03 | 17.59 | a | 20.17 | a | 24.38 | a | 31.81 | 37.67 | 43.16 | 43.00 | a | 37.87 | 28.90 | 20.80 | 16.27 | a | 27.72 | ||||||||
1983 | 15.59 | b | 20.93 | a | 22.00 | c | 21.37 | 27.55 | 34.67 | 39.84 | 43.34 | b | 40.59 | a | 31.32 | 23.28 | a | 21.15 | e | 28.47 | ||||||
1984 | 17.93 | a | 16.92 | d | 24.68 | 23.87 | 35.87 | 37.68 | b | 47.87 | a | 46.19 | 42.27 | 26.73 | a | 19.27 | 9.74 | 29.08 | ||||||||
1985 | 12.90 | a | 14.67 | a | 17.43 | a | 27.17 | 32.29 | 42.17 | 47.81 | 41.81 | 35.30 | 29.31 | b | 21.12 | d | 16.81 | d | 28.23 | |||||||
1986 | 23.32 | 21.79 | d | 22.79 | b | 27.38 | a | 31.42 | 39.37 | 43.06 | 45.52 | 33.00 | c | 28.75 | c | 23.48 | a | 19.11 | c | 29.92 | ||||||
1987 | 12.80 | f | 14.71 | g | 20.71 | c | 29.75 | b | 34.90 | 40.07 | 40.90 | a | 43.67 | a | 38.59 | a | 34.29 | c | 23.65 | g | 12.46 | g | 35.36 | d | ||
1988 | 16.71 | j | 18.13 | f | 22.10 | b | 27.41 | a | 31.77 | 39.20 | 46.45 | 45.61 | 38.27 | 33.48 | 22.04 | d | 13.59 | d | 31.99 | b | ||||||
1989 | 8.07 | c | 11.76 | c | 24.30 | a | 30.17 | 32.77 | 39.67 | 43.94 | 40.47 | a | 36.43 | 29.03 | a | 22.93 | b | 18.60 | a | 28.18 | ||||||
1990 | 12.72 | b | 11.50 | d | 21.33 | d | 30.00 | a | 31.06 | 37.97 | 45.77 | a | 41.67 | a | 37.53 | 30.87 | a | 22.67 | 10.59 | b | 27.81 | |||||
1991 | 15.65 | 22.00 | c | 15.71 | c | 23.10 | 28.68 | 36.70 | 46.13 | 43.55 | 41.77 | 34.06 | 25.17 | 19.19 | 29.31 | |||||||||||
1992 | 13.39 | 20.72 | 23.19 | 29.53 | 38.26 | 39.10 | 43.29 | 46.21 | b | ----- | z | 34.06 | 24.10 | 9.71 | 29.23 | a | ||||||||||
1993 | 14.81 | 15.74 | a | 23.52 | 24.79 | a | 30.68 | 37.17 | 41.48 | 41.34 | b | 35.76 | a | 30.77 | a | 21.03 | a | 14.32 | 27.62 | |||||||
1994 | 15.84 | 12.37 | a | 23.72 | b | 27.00 | a | 32.55 | 39.45 | a | 45.93 | a | 44.93 | a | 37.00 | b | 28.67 | a | 15.27 | 13.13 | 27.99 | |||||
1995 | 19.59 | b | 22.04 | a | 21.61 | c | 22.52 | a | 29.77 | 35.70 | 43.94 | 43.06 | 39.10 | 32.00 | 27.27 | 19.35 | 29.66 | |||||||||
1996 | 18.48 | b | 20.68 | a | 22.23 | 26.83 | 33.20 | a | 41.30 | 48.13 | a | 45.52 | 37.30 | 30.45 | b | 22.33 | 21.39 | 30.65 | ||||||||
1997 | 18.93 | a | 17.04 | 24.45 | 25.72 | a | 37.03 | a | 40.13 | 43.03 | 43.23 | 40.17 | 29.00 | 22.66 | a | 12.43 | a | 29.49 | ||||||||
1998 | 17.17 | a | 15.17 | d | 21.55 | 21.48 | a | 26.39 | 34.50 | 43.52 | 44.47 | a | 39.36 | b | 27.89 | c | 23.21 | b | 15.10 | b | 27.48 | |||||
1999 | 19.73 | a | 18.85 | a | 21.00 | b | 20.59 | a | 32.55 | 38.37 | 44.19 | 41.68 | 40.11 | c | 32.27 | a | 26.33 | c | 18.84 | 29.54 | ||||||
2000 | 21.00 | 18.69 | 21.59 | b | 27.67 | 35.65 | 42.92 | d | 41.61 | 43.77 | a | 36.07 | 30.17 | b | 18.03 | 21.52 | 29.89 | |||||||||
2001 | 12.48 | 14.32 | 22.35 | 21.17 | 37.80 | a | 40.63 | c | 44.50 | a | 45.56 | d | 40.97 | 34.17 | a | 24.75 | b | 13.90 | b | 29.38 | ||||||
2002 | 15.13 | a | 18.27 | b | 19.68 | 27.67 | 31.83 | b | 41.38 | a | 47.45 | b | 41.40 | f | 38.38 | a | 28.94 | 24.93 | 16.58 | 28.20 | a | |||||
2003 | 19.81 | 19.32 | 22.35 | 23.10 | 33.19 | 41.10 | a | 48.11 | c | 44.72 | b | 41.93 | 34.90 | 19.79 | a | 18.39 | c | 30.56 | ||||||||
2004 | 14.77 | 14.58 | c | 25.37 | a | 28.30 | 32.57 | a | 41.14 | a | 45.50 | a | 44.58 | 36.54 | b | 29.40 | a | 22.11 | b | 17.43 | a | 29.36 | ||||
2005 | 17.72 | b | 20.89 | a | 23.06 | 24.66 | a | 32.62 | b | 36.44 | c | 49.71 | g | 46.08 | g | 34.41 | a | 30.23 | 26.47 | 23.15 | e | 26.97 | b | |||
2006 | 17.50 | c | 17.25 | 14.48 | 26.30 | 33.20 | a | 42.19 | d | 49.21 | b | 42.27 | a | 37.89 | c | 28.07 | c | 23.72 | a | 16.29 | 29.03 | |||||
2007 | 10.73 | a | 18.54 | 22.90 | a | 27.10 | a | 34.80 | a | 40.29 | i | 46.57 | c | 46.41 | b | 37.68 | b | 29.57 | a | 26.13 | 13.17 | b | 28.51 | a | ||
2008 | 15.37 | d | 17.75 | a | 21.10 | b | 25.38 | d | 32.92 | e | 39.74 | c | 47.35 | 46.17 | b | 39.96 | c | 31.19 | 27.24 | a | 16.38 | g | 31.29 | a | ||
2009 | 17.80 | f | 16.25 | 19.32 | 25.15 | d | 37.73 | a | 38.97 | a | 45.74 | 43.13 | 41.93 | c | 29.43 | c | 24.25 | b | 15.87 | 30.71 | a | |||||
2010 | 18.34 | b | 19.56 | a | 20.00 | a | 20.79 | b | 27.52 | b | 37.38 | d | 45.41 | b | 41.15 | e | 37.44 | c | 35.59 | b | 21.30 | c | 21.20 | a | 28.81 | |
2011 | 17.97 | 14.43 | 22.29 | 24.90 | a | 28.05 | i | 35.96 | d | 42.70 | a | 42.03 | b | 40.42 | f | 33.25 | g | 21.59 | c | 17.15 | d | 26.56 | c | |||
2012 | 20.07 | b | 17.78 | b | 22.92 | e | 27.37 | 33.85 | d | 37.31 | a | 43.31 | b | 48.48 | d | 42.91 | h | 33.04 | g | 26.05 | i | 17.48 | 29.84 | c | ||
2013 | 12.81 | 14.26 | a | 24.55 | b | 29.14 | a | 34.87 | 41.00 | 48.94 | 43.63 | a | 40.34 | a | 27.61 | c | 25.64 | b | 15.63 | a | 29.87 | |||||
2014 | 22.23 | a | 21.39 | 24.79 | b | 27.88 | e | 33.47 | a | 38.62 | a | 47.74 | d | 41.81 | 41.39 | b | 32.97 | 24.72 | a | 20.07 | b | 31.42 | ||||
2015 | 20.83 | a | 25.33 | a | 26.13 | 25.95 | i | 33.12 | f | 41.75 | b | 45.94 | o | 45.60 | u | 40.62 | d | 34.87 | a | 17.97 | a | 13.65 | e | 27.64 | d | |
2016 | 17.20 | f | 19.50 | a | 23.84 | 29.04 | b | 33.60 | a | 41.96 | d | 45.00 | f | 44.14 | c | 37.68 | b | 30.77 | i | 24.90 | a | 17.00 | d | 30.18 | c | |
2017 | 16.86 | c | 23.12 | c | 22.30 | a | 26.33 | 32.00 | a | 38.59 | a | 47.87 | 46.13 | a | 38.67 | 28.58 | 25.77 | 20.84 | 30.59 | |||||||
2018 | 23.48 | 17.46 | 19.90 | a | 28.27 | 35.67 | a | 40.14 | a | 51.68 | 46.06 | 38.86 | b | 31.00 | 25.35 | d | 18.00 | j | 32.53 | a | ||||||
2019 | 19.38 | b | 14.46 | 21.42 | 28.76 | a | 29.81 | 39.07 | a | 44.52 | 44.61 | 37.21 | f | 27.44 | d | 24.07 | a | 18.32 | 28.35 | a | ||||||
2020 | 16.58 | 20.19 | b | 19.70 | a | 27.90 | 33.33 | a | 40.72 | a | 44.86 | c | 48.41 | b | 43.14 | a | 34.26 | 21.87 | 17.53 | a | 30.71 | |||||
2021 | 17.42 | 17.61 | 18.81 | 27.57 | 33.71 | 44.20 | 51.81 | j | 48.50 | w | ----- | z | ----- | z | ----- | z | ----- | z | 26.55 | f | ||||||
2022 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.37 | a | 28.80 | 27.84 | 30.67 | i | ||
2024 | 23.71 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 16.54 | 17.53 | 21.15 | 25.37 | 32.30 | 39.02 | 44.84 | 43.63 | 38.29 | 30.35 | 22.99 | 16.93 | 28.93 | |||||||||||||
S.D. | 3.56 | 3.17 | 2.77 | 3.04 | 2.76 | 2.38 | 2.52 | 2.36 | 2.46 | 2.67 | 2.86 | 4.16 | 1.17 | |||||||||||||
SKEW | -0.23 | 0.06 | -0.58 | -0.55 | 0.05 | -0.08 | 0.29 | -0.27 | -0.15 | 0.30 | -0.51 | -0.10 | 0.13 | |||||||||||||
MAX | 23.48 | 25.33 | 26.13 | 30.17 | 38.26 | 44.20 | 51.68 | 48.48 | 43.14 | 35.59 | 28.80 | 27.84 | 31.42 | |||||||||||||
MIN | 8.07 | 11.50 | 14.48 | 16.57 | 26.39 | 34.03 | 39.77 | 38.17 | 33.00 | 24.71 | 15.27 | 7.19 | 26.69 | |||||||||||||
YRS | 49 | 51 | 52 | 52 | 50 | 50 | 48 | 48 | 47 | 50 | 51 | 51 | 34 |