YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 14.29 | 22.36 | 21.90 | 34.83 | 45.87 | 51.10 | 61.55 | 61.10 | 46.34 | a | ----- | z | 26.27 | 18.19 | 36.71 | a | ||||||||||
1971 | 17.48 | 21.07 | 25.97 | 38.13 | 43.45 | 57.90 | a | 61.39 | 56.90 | 47.47 | 38.61 | m | 29.23 | 22.55 | 38.32 | a | ||||||||||
1972 | 14.47 | a | 21.85 | b | ----- | z | 38.14 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.56 | e | ----- | z | 24.50 | h |
1973 | ----- | z | 24.04 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.90 | u | 30.14 | a | 20.85 | d | 25.01 | i | |
1974 | 20.70 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.07 | 18.52 | b | 22.43 | i | |
1975 | 17.76 | b | 21.80 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.62 | d | 31.69 | r | 24.36 | e | 25.24 | b | 27.56 | g |
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 | 33.04 | g | 24.83 | 23.11 | c | 23.97 | j | |
1981 | 18.48 | 16.86 | g | 26.87 | 41.23 | 41.90 | 52.60 | 53.97 | 51.29 | 42.87 | ----- | z | ----- | z | ----- | z | 41.15 | d | ||||||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 51.38 | d | 58.75 | g | 58.16 | f | 50.60 | 37.52 | j | 20.40 | 19.55 | 35.48 | h | |||
1983 | 21.52 | 23.54 | 29.16 | 32.07 | 41.26 | 50.50 | 61.35 | 60.52 | 49.27 | 41.13 | 25.10 | 6.83 | a | 36.85 | ||||||||||||
1984 | 11.63 | a | 18.48 | 22.03 | 33.20 | 46.00 | 52.03 | 57.32 | 56.32 | 52.07 | a | 40.29 | 32.37 | 26.57 | a | 37.36 | ||||||||||
1985 | 19.57 | a | ----- | z | 32.84 | 42.27 | 53.81 | 61.13 | 65.42 | 64.00 | 58.46 | f | 43.67 | j | 26.08 | f | 18.52 | 44.69 | d | |||||||
1986 | 28.19 | 29.43 | 39.29 | 43.34 | a | 51.10 | 62.67 | 65.03 | 64.65 | 56.10 | 43.00 | a | 30.03 | 24.55 | 44.78 | |||||||||||
1987 | 24.87 | a | 31.14 | 29.23 | 39.40 | 53.61 | 60.10 | 63.13 | 61.63 | a | 53.47 | 41.65 | 32.13 | 22.10 | 42.70 | |||||||||||
1988 | 18.73 | a | 25.34 | 30.59 | i | 39.50 | 49.90 | 61.13 | 64.58 | 64.55 | 52.28 | a | 42.35 | 34.07 | 25.30 | a | 43.43 | a | ||||||||
1989 | 25.33 | a | 19.48 | a | 33.28 | b | 42.48 | a | 51.32 | 55.59 | a | 60.97 | 61.26 | 49.89 | b | 36.65 | 23.62 | a | 11.77 | 39.30 | ||||||
1990 | 17.45 | 19.89 | 27.81 | 36.83 | 43.37 | a | 58.73 | 60.87 | 58.23 | 55.20 | 36.10 | 28.20 | 12.43 | a | 37.93 | |||||||||||
1991 | 15.87 | 21.00 | 28.00 | 36.40 | 48.65 | 57.93 | 59.87 | 60.62 | b | 51.20 | 36.16 | 23.55 | a | 20.45 | 38.31 | |||||||||||
1992 | 19.97 | 25.34 | 29.06 | 39.72 | a | 47.48 | 53.87 | 60.03 | 57.67 | a | 51.55 | a | 37.81 | 23.57 | 18.00 | 38.67 | ||||||||||
1993 | 15.84 | 19.54 | 28.23 | 36.07 | 47.87 | 56.40 | 62.13 | 60.35 | 46.77 | d | 37.17 | b | 22.07 | a | 20.71 | 37.76 | ||||||||||
1994 | 18.26 | 16.14 | 30.77 | 36.27 | 50.39 | 59.90 | 59.74 | 61.90 | 51.31 | a | 37.23 | 27.20 | 23.30 | a | 39.37 | |||||||||||
1995 | 20.40 | a | 25.64 | 29.80 | a | 33.80 | 44.27 | a | 53.67 | c | 59.44 | d | 61.50 | c | 51.11 | b | 34.83 | a | 27.36 | b | 21.33 | a | 38.60 | |||
1996 | 12.87 | a | 18.64 | a | 21.65 | 36.63 | c | 50.29 | 58.90 | a | 61.07 | a | 58.48 | b | 49.35 | d | 35.68 | c | 24.50 | b | 16.16 | 37.02 | ||||
1997 | 15.97 | b | 21.46 | 26.87 | 31.37 | 44.42 | 54.25 | b | 60.97 | a | 57.50 | a | 52.57 | 37.73 | a | 24.63 | 20.03 | 37.31 | ||||||||
1998 | 20.23 | 26.04 | a | 25.32 | 33.83 | 47.90 | 53.93 | a | 63.16 | 59.00 | 54.57 | 41.59 | d | 30.77 | 18.13 | 39.54 | ||||||||||
1999 | 21.45 | b | 23.32 | 26.90 | 35.80 | 44.90 | 54.60 | 62.58 | 60.19 | 50.17 | 35.63 | a | 28.80 | 21.19 | 38.80 | |||||||||||
2000 | 18.10 | 25.68 | a | 30.10 | 35.27 | 48.65 | 57.03 | 62.04 | c | 62.19 | 49.87 | 40.65 | 22.53 | 15.42 | 38.96 | |||||||||||
2001 | 15.87 | 22.00 | a | 28.45 | 36.52 | a | 48.13 | 55.48 | a | 64.06 | 60.43 | a | 50.53 | 35.16 | 29.43 | b | 18.57 | a | 38.72 | |||||||
2002 | 17.19 | 19.27 | b | 20.30 | a | 37.53 | 45.10 | 61.67 | 63.16 | 61.68 | 52.63 | 37.10 | 26.50 | f | 18.68 | 39.48 | a | |||||||||
2003 | 21.00 | 18.93 | a | 28.61 | 37.24 | a | 47.00 | 54.55 | a | 64.03 | b | 61.33 | a | 49.13 | 40.45 | 26.18 | b | 18.60 | a | 38.92 | ||||||
2004 | 18.65 | 15.55 | 31.87 | 37.37 | 47.55 | 55.40 | 59.52 | 56.45 | 51.60 | 40.00 | 29.32 | b | 21.57 | a | 38.74 | |||||||||||
2005 | 21.77 | 24.59 | a | 26.81 | 35.86 | a | 46.83 | a | 54.07 | a | 60.16 | 59.55 | 53.72 | a | 38.93 | a | 25.97 | 16.77 | 38.75 | |||||||
2006 | 21.45 | 15.44 | a | 26.29 | 37.87 | 48.63 | a | 58.41 | a | 63.77 | 61.90 | 44.79 | b | 37.00 | 27.96 | b | 19.83 | b | 38.61 | |||||||
2007 | 11.77 | 18.86 | 31.60 | a | 33.72 | a | 46.65 | 54.60 | 61.03 | 64.13 | 53.43 | 39.10 | a | 25.03 | 16.00 | 37.99 | ||||||||||
2008 | 16.52 | 18.69 | 27.10 | 32.20 | 44.61 | 57.03 | a | 64.81 | 62.57 | a | 52.50 | 41.14 | b | 32.63 | 23.26 | 39.42 | ||||||||||
2009 | 23.39 | 26.71 | 30.48 | 37.66 | a | 49.42 | 57.47 | 63.43 | c | 60.10 | a | 50.30 | 37.55 | b | 33.53 | 19.48 | b | 40.79 | ||||||||
2010 | 19.71 | c | 23.00 | 30.32 | 41.38 | a | 45.63 | a | 61.26 | g | 64.72 | b | 61.30 | a | 54.10 | 42.27 | a | 28.13 | 23.26 | 39.44 | a | |||||
2011 | 18.48 | 18.19 | a | 29.77 | a | 38.40 | 45.19 | 59.63 | 67.29 | c | 67.31 | b | 52.24 | a | 39.35 | 30.56 | c | 19.69 | b | 40.51 | ||||||
2012 | 25.33 | a | 26.00 | c | 34.83 | b | ----- | z | 48.29 | 58.70 | 61.00 | a | ----- | z | 46.57 | ----- | z | 29.90 | 21.52 | 39.13 | c | |||||
2013 | 18.29 | 20.64 | 27.84 | 32.00 | 45.60 | a | 56.50 | b | 63.45 | 61.10 | 56.03 | 36.45 | 27.87 | 20.00 | 38.81 | |||||||||||
2014 | 18.93 | a | 22.04 | 28.45 | 39.79 | b | 46.55 | 59.55 | a | 62.94 | 59.89 | v | 53.27 | d | 41.81 | 23.90 | 22.74 | 38.18 | a | |||||||
2015 | 22.45 | 23.29 | 32.65 | 38.03 | 45.53 | a | 58.40 | 60.65 | 58.80 | a | 53.40 | 43.23 | 26.07 | 21.84 | 40.36 | |||||||||||
2016 | 20.84 | 25.66 | 26.45 | 37.20 | 44.19 | 57.00 | 61.68 | 59.23 | 51.57 | 40.26 | 33.67 | 20.19 | 39.83 | |||||||||||||
2017 | 23.90 | 28.71 | 32.61 | 40.13 | 44.16 | 55.55 | a | 61.65 | 57.32 | 51.60 | 39.06 | 31.43 | 19.19 | 40.44 | ||||||||||||
2018 | 17.87 | 19.93 | 27.77 | 33.40 | 50.87 | 58.93 | 61.90 | 58.55 | 52.87 | 39.19 | 26.27 | 20.71 | 39.02 | |||||||||||||
2019 | 21.42 | 17.18 | 25.94 | 36.30 | 42.65 | 53.37 | 61.61 | 60.68 | 56.13 | 32.74 | 22.80 | 20.32 | 37.59 | |||||||||||||
2020 | 18.61 | 17.72 | 30.61 | 34.40 | 47.08 | g | 61.33 | 64.06 | 59.42 | 47.87 | 35.13 | 31.67 | 21.52 | 38.40 | a | |||||||||||
2021 | 20.10 | 12.14 | 28.55 | 34.43 | 48.45 | 57.73 | 61.84 | 59.77 | a | 53.17 | 39.06 | 28.97 | 22.74 | 38.91 | ||||||||||||
2022 | 14.65 | 13.89 | 25.10 | 34.47 | 46.84 | 58.83 | 61.42 | 59.85 | k | 51.62 | v | 42.06 | 24.80 | 14.45 | 33.65 | b | ||||||||||
2023 | 18.29 | 16.93 | 26.19 | 34.80 | 52.65 | 59.57 | 65.74 | 62.42 | 56.20 | 45.03 | 34.17 | 27.15 | d | 41.59 | ||||||||||||
2024 | 15.03 | 25.69 | 28.55 | 36.96 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.09 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.98 | 21.57 | 28.46 | 36.76 | 47.14 | 56.80 | 62.06 | 60.34 | 51.28 | 38.92 | 27.61 | 19.98 | 39.16 | |||||||||||||
S.D. | 3.52 | 4.15 | 3.54 | 2.96 | 3.02 | 3.07 | 2.34 | 2.77 | 3.04 | 2.80 | 3.56 | 3.77 | 1.63 | |||||||||||||
SKEW | 0.18 | 0.05 | 0.23 | 0.27 | 0.30 | -0.18 | -0.67 | -0.43 | -0.58 | 0.01 | 0.13 | -0.97 | 1.49 | |||||||||||||
MAX | 28.19 | 31.14 | 39.29 | 43.34 | 53.81 | 62.67 | 67.29 | 67.31 | 56.20 | 45.03 | 34.17 | 27.15 | 44.78 | |||||||||||||
MIN | 11.63 | 12.14 | 20.30 | 31.37 | 41.26 | 50.50 | 53.97 | 51.29 | 42.87 | 32.74 | 20.40 | 6.83 | 36.85 | |||||||||||||
YRS | 48 | 46 | 44 | 44 | 43 | 44 | 44 | 41 | 44 | 39 | 47 | 48 | 33 |