YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 41.42 | a | 49.58 | 58.31 | 54.16 | 49.92 | e | 42.47 | 29.78 | 15.31 | e | 42.62 | d | |||||
1968 | 17.19 | b | 20.52 | 22.56 | 29.19 | a | 40.20 | a | 50.97 | 56.15 | 53.69 | 45.55 | 38.71 | 25.33 | 18.64 | f | 36.37 | a | ||||||||
1969 | 21.77 | 15.30 | 14.20 | k | 35.37 | 45.19 | 48.32 | 57.79 | 58.15 | 49.50 | 32.66 | 28.15 | 20.45 | 37.51 | a | |||||||||||
1970 | 10.31 | o | 20.97 | l | 19.24 | 25.20 | 41.42 | 49.77 | 57.24 | 57.21 | 46.52 | 35.56 | 29.57 | a | 19.90 | 38.16 | b | |||||||||
1971 | 21.26 | 18.32 | 22.31 | 33.37 | 39.61 | 49.20 | 54.65 | 55.45 | 45.45 | 37.89 | l | 26.75 | 15.95 | 34.76 | a | |||||||||||
1972 | 18.95 | 15.22 | k | 29.58 | a | 34.36 | a | 40.82 | 49.37 | 54.35 | 53.19 | 47.77 | f | 38.50 | c | 20.57 | 14.95 | a | 35.47 | b | ||||||
1973 | 14.72 | a | 16.07 | 20.20 | a | 25.47 | 38.67 | a | 47.47 | 53.08 | 52.20 | a | 43.42 | 38.72 | a | 30.17 | 22.50 | h | 34.56 | a | ||||||
1974 | 12.97 | 15.45 | 25.30 | c | 29.25 | 41.48 | 48.30 | 55.06 | 51.35 | 45.93 | 39.16 | 25.88 | 15.07 | a | 33.77 | |||||||||||
1975 | 14.44 | f | 12.53 | j | 19.10 | g | 23.70 | 35.74 | b | 51.26 | m | 55.69 | 52.32 | 46.10 | 35.08 | a | 23.38 | 23.00 | 36.88 | d | ||||||
1976 | 16.98 | 19.41 | ----- | z | 29.73 | 38.55 | a | 46.40 | 55.39 | 51.89 | 47.59 | a | 34.00 | 26.40 | 18.58 | 34.99 | a | |||||||||
1977 | 14.50 | 17.91 | 21.65 | 34.00 | 42.25 | a | 53.12 | 56.32 | 53.47 | 47.70 | 37.61 | 28.32 | 19.87 | a | 35.56 | |||||||||||
1978 | 15.22 | b | 15.68 | 26.80 | h | 34.95 | j | 41.25 | i | 53.07 | i | 58.48 | k | 55.28 | h | 49.28 | 40.74 | n | 27.82 | k | 15.35 | k | 26.73 | i | ||
1979 | 8.27 | i | 17.97 | i | 25.45 | l | 31.10 | i | 41.08 | f | 49.73 | 56.83 | d | 54.74 | h | 51.59 | m | 42.43 | i | 18.56 | l | 21.89 | l | 53.28 | j | |
1980 | 18.00 | k | 19.67 | k | 19.76 | l | 28.71 | i | 41.31 | j | 54.33 | i | 60.44 | m | 57.67 | j | 50.76 | i | 38.98 | k | 29.52 | h | 29.88 | k | ----- | z |
1981 | 21.77 | k | 21.85 | k | 23.50 | j | 38.08 | f | 43.80 | h | 55.56 | d | 58.70 | i | 55.32 | f | 50.98 | 41.00 | j | 32.79 | k | 20.79 | j | 53.27 | j | |
1982 | 17.35 | k | 15.26 | i | 26.57 | i | 30.41 | h | 41.62 | a | 50.13 | 56.42 | 57.00 | 48.87 | 35.67 | k | 26.45 | k | 20.73 | k | 50.81 | g | ||||
1983 | 22.38 | j | 20.84 | i | 23.20 | h | 24.67 | a | 39.56 | g | 49.00 | 57.58 | 58.37 | 51.80 | 40.33 | j | 28.66 | k | 14.32 | n | 48.28 | g | ||||
1984 | 14.14 | j | 18.26 | j | 22.00 | i | 27.52 | h | 42.24 | d | 49.28 | 57.32 | 55.33 | d | 49.47 | k | 31.55 | i | 25.66 | k | 18.34 | l | 51.04 | h | ||
1985 | 13.59 | i | 13.71 | 25.71 | j | 35.39 | h | 45.19 | 53.77 | 57.63 | h | 58.09 | i | 47.79 | k | 40.55 | i | 26.69 | l | 22.61 | l | 37.56 | i | |||
1986 | 24.07 | j | 23.68 | i | 30.12 | j | 36.95 | h | 43.35 | a | 54.05 | 56.60 | 57.76 | j | 47.62 | i | 40.07 | i | 31.19 | l | 21.26 | j | 51.33 | i | ||
1987 | 15.07 | d | 19.69 | j | 21.93 | i | 34.50 | a | 44.70 | d | 53.53 | a | 57.98 | i | 56.29 | j | 49.76 | i | 43.31 | j | 29.89 | k | 20.62 | j | 36.95 | h |
1988 | 15.29 | l | 21.07 | i | 23.55 | j | 35.74 | i | 44.14 | c | 54.55 | 58.07 | h | 57.91 | h | 47.48 | i | 43.40 | k | 29.61 | k | 17.95 | j | 49.35 | j | |
1989 | 16.07 | k | 14.61 | j | 31.07 | h | 37.00 | j | 45.19 | b | 50.77 | 59.12 | k | 55.85 | h | 50.08 | j | 39.64 | j | 29.23 | j | 19.18 | l | 47.98 | j | |
1990 | 16.48 | k | 21.82 | i | 28.16 | i | 37.19 | i | 41.56 | f | 55.03 | 58.17 | j | 56.54 | h | 51.76 | k | 40.32 | i | 30.25 | j | 20.05 | l | 55.03 | k | |
1991 | 15.36 | j | 23.45 | i | 22.48 | j | 31.57 | i | 42.78 | d | 51.07 | 55.57 | i | 55.32 | i | 48.80 | j | 40.48 | i | 26.92 | k | 19.98 | j | 46.92 | j | |
1992 | 17.31 | j | 19.95 | j | 25.17 | j | 37.95 | j | 45.33 | b | 49.27 | 53.74 | d | 53.62 | k | 49.15 | f | 42.62 | c | 23.52 | a | 18.44 | e | 38.82 | f | |
1993 | 19.29 | c | 17.02 | b | 29.23 | e | 31.91 | b | 43.67 | b | 51.00 | a | 56.02 | c | 56.08 | 48.12 | e | 39.28 | b | 24.47 | a | 19.60 | b | 36.31 | ||
1994 | 19.84 | c | 17.92 | c | 28.88 | b | 33.70 | b | 46.07 | a | 56.43 | a | 58.59 | b | 57.71 | c | 50.13 | c | 39.40 | b | 25.57 | c | 22.94 | d | 38.10 | |
1995 | 18.46 | e | 25.74 | c | 25.11 | d | 29.05 | i | 38.60 | a | 49.71 | b | 54.69 | 58.82 | c | 49.68 | p | 38.77 | r | 32.55 | s | 21.50 | g | 38.73 | e | |
1996 | 18.26 | l | 22.44 | l | 25.59 | n | 34.71 | k | 47.65 | e | 53.27 | 59.94 | f | 57.21 | j | 46.28 | a | 39.57 | d | 30.30 | b | 21.72 | b | 39.80 | f | |
1997 | 19.83 | b | 18.22 | c | 29.64 | b | 30.87 | 44.60 | b | 53.15 | 57.85 | a | 57.44 | f | 52.93 | a | 38.76 | b | 27.83 | d | 20.74 | b | 35.86 | a | ||
1998 | 22.43 | c | 21.02 | a | 25.81 | e | 30.04 | g | 45.02 | a | 49.90 | a | 60.03 | b | 57.60 | b | 54.50 | c | 40.78 | b | 33.52 | a | 25.14 | b | 39.61 | a |
1999 | 22.76 | j | 18.90 | g | 31.53 | a | 32.18 | b | 41.46 | d | 51.05 | b | 59.24 | f | 56.76 | f | 48.54 | c | 41.24 | b | 35.16 | a | 22.22 | a | 37.92 | d |
2000 | 23.25 | a | 26.15 | c | 26.72 | a | 36.45 | h | 46.95 | b | 54.40 | d | 59.84 | 59.52 | e | 51.74 | e | 41.50 | a | 23.16 | b | 21.08 | e | 39.48 | a | |
2001 | 17.87 | e | 19.42 | b | 26.67 | a | 35.10 | 44.60 | a | 54.62 | a | 57.85 | a | 56.48 | a | 49.64 | a | 40.02 | c | 30.81 | a | 20.15 | a | 37.77 | ||
2002 | 19.80 | d | 18.71 | b | 23.44 | e | 38.15 | d | 44.24 | 56.28 | 63.05 | 59.45 | c | 51.85 | c | 39.09 | c | 28.83 | a | 21.74 | d | 38.72 | ||||
2003 | 27.89 | c | 19.83 | b | 31.48 | g | 35.43 | b | 45.81 | 51.43 | 61.61 | 58.47 | 48.48 | b | 44.50 | b | 28.81 | c | 23.84 | 40.55 | a | |||||
2004 | 19.24 | 17.60 | d | 32.62 | b | 33.62 | a | 45.17 | b | 52.02 | a | 56.63 | p | 53.03 | b | 46.64 | i | 38.26 | b | 26.73 | b | 21.91 | c | 34.02 | b | |
2005 | 22.03 | b | 20.71 | b | 24.27 | 34.17 | a | 44.19 | b | 51.88 | 62.23 | 56.72 | b | 52.62 | b | 41.57 | c | 31.77 | 20.60 | b | 38.57 | |||||
2006 | 20.55 | b | 21.40 | c | 26.03 | b | 38.06 | c | 46.02 | a | 54.93 | a | 59.72 | b | 55.67 | b | ----- | z | 38.93 | d | 33.86 | e | 23.98 | h | 39.52 | b |
2007 | 16.93 | c | 22.42 | c | 30.04 | c | 35.21 | b | 44.08 | 53.18 | 60.61 | 58.75 | a | 49.75 | b | 40.13 | e | 32.71 | b | 16.55 | c | 38.36 | ||||
2008 | 11.85 | g | 18.11 | a | 20.98 | 27.69 | c | 40.63 | a | 52.87 | c | 59.35 | 57.52 | 50.34 | a | 41.53 | a | 33.82 | 21.44 | 38.57 | a | |||||
2009 | 23.79 | 23.23 | 29.79 | 34.50 | 46.52 | 50.40 | 57.94 | 54.53 | 48.33 | 35.40 | 32.17 | 14.13 | 37.56 | |||||||||||||
2010 | 19.10 | 12.95 | 22.47 | 32.95 | 41.35 | 54.65 | 59.11 | 56.42 | 50.93 | 39.68 | i | 28.36 | a | 27.03 | 36.85 | a | ||||||||||
2011 | 19.27 | 17.29 | 29.27 | 35.07 | 40.97 | 53.53 | 60.58 | 58.31 | 50.05 | 39.47 | 28.77 | 19.05 | 37.64 | |||||||||||||
2012 | 22.18 | 15.83 | 29.94 | 38.52 | 45.89 | 57.12 | 59.03 | 55.42 | 48.95 | a | 38.87 | 31.82 | 19.27 | 38.57 | ||||||||||||
2013 | 14.69 | 14.61 | 22.87 | 30.52 | 40.82 | 54.18 | 57.72 | a | 55.00 | 48.37 | 35.85 | 27.80 | h | 18.23 | 35.71 | a | ||||||||||
2014 | 18.21 | 20.95 | 24.38 | a | 30.77 | 41.11 | 51.68 | 57.73 | a | 52.58 | 50.78 | 42.03 | 29.08 | 22.87 | 36.85 | |||||||||||
2015 | 23.50 | 24.12 | 30.75 | a | 35.00 | 42.55 | 56.70 | 56.90 | 56.92 | 52.50 | 44.02 | 27.20 | 19.55 | 39.14 | ||||||||||||
2016 | 16.94 | 24.41 | 29.92 | a | 35.08 | 42.24 | 58.18 | 59.90 | 54.85 | 50.40 | 43.18 | 33.67 | 20.82 | 39.13 | ||||||||||||
2017 | 17.39 | 27.11 | 33.53 | 35.13 | 43.48 | 56.57 | 59.28 | a | 55.06 | 50.68 | 40.32 | 34.77 | 26.06 | 39.95 | ||||||||||||
2018 | 24.39 | 24.16 | 28.48 | 37.42 | 46.27 | 55.95 | 59.27 | 56.47 | 51.62 | 38.98 | 25.87 | 18.63 | 38.96 | |||||||||||||
2019 | 18.56 | 17.12 | 25.53 | 36.08 | 38.97 | 50.95 | 57.53 | 56.77 | 52.72 | 36.40 | 31.27 | 18.85 | 36.73 | |||||||||||||
2020 | 18.34 | 17.78 | 28.55 | 36.57 | 47.95 | 55.80 | 59.84 | 61.85 | 51.43 | 43.81 | 32.35 | 21.19 | 39.62 | |||||||||||||
2021 | 19.97 | 20.61 | 26.44 | 35.88 | 45.84 | 57.62 | 61.94 | 58.26 | 55.82 | 41.60 | 36.31 | a | 27.45 | 40.64 | ||||||||||||
2022 | 22.66 | 18.75 | 27.73 | 35.27 | 45.69 | 56.22 | 60.35 | 58.95 | 55.28 | 42.10 | 28.10 | 20.34 | 39.29 | |||||||||||||
2023 | 18.66 | 18.19 | a | 20.55 | 32.37 | 46.43 | a | 50.88 | 62.21 | 59.87 | 52.45 | 42.60 | 31.80 | 24.45 | 38.37 | |||||||||||
2024 | 18.95 | 20.64 | 25.47 | 36.50 | 36.39 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.39 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.30 | 19.34 | 26.42 | 33.06 | 43.23 | 52.50 | 58.07 | 56.21 | 49.85 | 39.61 | 29.19 | 20.49 | 38.08 | |||||||||||||
S.D. | 3.13 | 3.45 | 3.71 | 3.78 | 2.73 | 2.91 | 2.39 | 2.48 | 2.72 | 2.78 | 3.67 | 3.19 | 1.58 | |||||||||||||
SKEW | 0.32 | 0.43 | -0.13 | -0.94 | -0.46 | 0.06 | 0.03 | -0.12 | -0.06 | -0.46 | -0.15 | 0.10 | -0.95 | |||||||||||||
MAX | 27.89 | 27.11 | 33.53 | 38.52 | 47.95 | 58.18 | 63.05 | 61.85 | 55.82 | 44.50 | 36.31 | 27.45 | 40.64 | |||||||||||||
MIN | 12.97 | 12.95 | 19.24 | 23.70 | 35.74 | 46.40 | 53.08 | 51.35 | 43.42 | 32.66 | 20.57 | 14.13 | 33.77 | |||||||||||||
YRS | 39 | 39 | 37 | 40 | 51 | 54 | 45 | 42 | 42 | 40 | 41 | 39 | 21 |