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 | 27.15 | r | 28.90 | 21.14 | b | 25.02 | j | |
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 | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.81 | d | 34.04 | e | 31.84 | f | 28.31 | d | 23.67 | d | 31.71 | h |
1987 | 20.05 | i | 23.88 | c | 26.30 | d | 30.52 | e | 33.45 | i | 39.83 | f | 40.90 | b | 39.93 | b | 39.25 | f | 31.75 | c | 28.58 | d | 20.19 | d | 30.25 | d |
1988 | 17.22 | h | 24.52 | f | 25.59 | i | 31.33 | f | 33.72 | f | 37.88 | f | 42.88 | f | 39.79 | g | 34.47 | k | 36.22 | d | 28.32 | e | 22.58 | g | 32.27 | j |
1989 | 20.53 | l | 14.17 | j | 24.44 | o | 30.68 | k | 33.80 | f | 41.67 | f | 43.12 | g | 40.88 | e | 38.54 | f | 32.04 | d | 28.39 | g | 22.07 | d | 31.67 | i |
1990 | 24.96 | g | 16.90 | g | 24.71 | g | 29.33 | 32.04 | f | 37.75 | b | 43.40 | a | 43.77 | a | 39.81 | c | 30.59 | d | 29.69 | d | 9.77 | e | 33.01 | d | |
1991 | 18.92 | e | 29.70 | a | 23.92 | e | 29.60 | e | 33.28 | f | 36.81 | c | 46.63 | a | 45.96 | c | 36.41 | a | 29.08 | e | 28.05 | h | 27.21 | c | 32.43 | b |
1992 | 25.29 | c | 29.57 | a | 28.83 | b | 32.82 | b | 37.04 | c | 39.33 | c | 41.21 | b | 40.03 | a | 35.43 | 32.85 | d | 28.96 | c | 21.04 | c | 32.70 | ||
1993 | 17.04 | h | 17.04 | b | 28.11 | c | 30.25 | b | 37.39 | c | 37.11 | b | 37.63 | d | 40.93 | c | 37.55 | a | 32.31 | b | 20.50 | d | 24.38 | e | 31.20 | a |
1994 | 24.48 | d | 22.44 | c | 26.22 | d | 32.09 | g | 36.67 | a | 35.57 | 41.19 | 37.61 | 38.50 | b | 30.31 | e | 20.12 | f | 20.61 | c | 31.36 | b | |||
1995 | 28.26 | d | 25.14 | f | 26.09 | h | 28.46 | d | 35.00 | e | 40.81 | c | 46.50 | c | 40.15 | e | 41.96 | d | 33.54 | e | 33.91 | g | 27.77 | a | 35.83 | c |
1996 | 23.39 | c | 23.80 | d | 26.08 | e | 30.66 | a | 33.15 | d | 37.56 | c | 43.85 | d | 44.48 | f | 36.54 | d | 32.73 | i | 28.04 | e | 25.59 | d | 30.87 | b |
1997 | 21.78 | d | 23.48 | e | 26.25 | c | 27.83 | f | 34.05 | l | 38.53 | o | 40.62 | o | 44.40 | p | 46.08 | q | 31.06 | o | 31.72 | a | 22.11 | c | 25.07 | g |
1998 | 26.84 | 26.75 | h | 23.16 | 31.00 | l | 37.78 | v | 40.17 | l | 47.50 | m | 40.32 | l | 36.50 | n | 32.46 | r | 29.67 | o | 19.55 | i | 25.00 | j | ||
1999 | 22.48 | j | 23.00 | d | 23.61 | m | 26.05 | i | 28.00 | t | 36.94 | l | 41.09 | t | 44.53 | p | 37.10 | t | 35.00 | y | 32.41 | m | 28.27 | p | 23.00 | k |
2000 | 21.36 | i | 24.65 | l | 24.80 | p | 28.57 | p | 34.00 | m | 39.37 | k | 37.67 | s | 37.63 | l | 39.40 | o | 32.00 | n | 23.58 | r | 27.33 | m | ----- | z |
2001 | 21.59 | n | 20.18 | k | 26.74 | l | 26.89 | l | 33.28 | m | 36.41 | m | 40.12 | o | 40.31 | o | 36.94 | n | 28.10 | u | 28.36 | s | 24.17 | g | ----- | z |
2002 | 20.16 | l | 21.90 | h | 21.32 | i | 26.67 | o | 30.12 | o | 39.58 | k | 42.21 | q | 37.76 | n | 34.87 | o | 29.20 | u | 27.62 | n | 25.11 | m | ----- | z |
2003 | 24.47 | n | 21.06 | j | 25.67 | m | 27.63 | k | ----- | z | 37.93 | o | 40.28 | m | 41.67 | m | 35.73 | s | 34.53 | l | 22.00 | v | 27.18 | n | ----- | z |
2004 | 23.80 | k | 26.05 | j | 27.38 | o | 28.53 | k | 34.62 | o | 39.67 | o | 40.94 | n | 43.85 | r | 37.36 | p | 33.27 | p | 24.28 | l | 24.44 | o | ----- | z |
2005 | 22.21 | l | 25.00 | n | 27.00 | k | 30.18 | m | 33.71 | q | 35.71 | m | 41.67 | p | 38.74 | l | 31.44 | n | 35.27 | t | 21.85 | q | 22.00 | l | ----- | z |
2006 | 25.53 | l | 19.12 | k | 22.29 | j | 27.65 | g | ----- | z | 42.67 | l | 41.27 | t | 38.18 | n | 36.14 | h | 31.42 | 29.30 | c | 22.81 | e | 27.84 | i | |
2007 | 16.68 | c | 26.00 | a | 27.17 | a | 29.45 | a | 34.28 | b | 38.03 | a | 46.76 | b | 39.40 | a | 36.41 | c | 31.86 | b | 25.83 | a | 23.07 | a | 31.24 | |
2008 | 18.65 | e | 24.34 | 22.67 | a | 24.03 | a | 32.42 | 33.71 | b | 41.23 | a | 44.62 | e | 41.48 | a | 34.70 | a | 30.31 | a | 20.84 | 30.75 | ||||
2009 | 20.07 | b | 22.24 | c | 24.03 | a | 25.62 | a | 33.17 | b | 41.63 | 42.68 | 41.29 | 39.43 | b | 31.42 | 26.63 | 17.13 | a | 30.45 | ||||||
2010 | 28.97 | 27.39 | 26.03 | b | 27.47 | 32.84 | 38.28 | a | 42.24 | b | 42.03 | a | 38.63 | 35.48 | 26.63 | 25.94 | 32.66 | |||||||||
2011 | 23.84 | 19.82 | 26.97 | 25.20 | 30.81 | 36.83 | 38.74 | 40.19 | 41.10 | 34.03 | 26.46 | b | 19.19 | 30.27 | ||||||||||||
2012 | 22.74 | 23.48 | 22.58 | 28.85 | d | 32.42 | 37.17 | 42.68 | 40.32 | 37.20 | 33.00 | 29.33 | 22.94 | 31.06 | ||||||||||||
2013 | 18.40 | a | 22.32 | 25.28 | b | 27.50 | 35.23 | 38.96 | b | 38.29 | j | 43.35 | 41.85 | c | 29.89 | c | 28.00 | a | 16.58 | 29.76 | a | |||||
2014 | 24.77 | 23.18 | 26.65 | 29.33 | 36.39 | 36.87 | 45.16 | 43.45 | 40.77 | 35.52 | 27.97 | 27.84 | 33.16 | |||||||||||||
2015 | 27.68 | 28.93 | 28.80 | a | 26.93 | 35.00 | 41.80 | 43.03 | 41.87 | a | 35.47 | 36.84 | 26.73 | 24.84 | f | 33.92 | a | |||||||||
2016 | 28.25 | k | 27.36 | a | 27.97 | a | 32.62 | a | 37.81 | e | 34.80 | j | 39.10 | 38.97 | a | 35.10 | 35.65 | 32.23 | 15.71 | 32.25 | b | |||||
2017 | 15.73 | a | 25.21 | 28.06 | 27.93 | 32.84 | 42.10 | 40.94 | 42.57 | a | 40.03 | 30.65 | 27.82 | b | 22.90 | a | 31.40 | |||||||||
2018 | 27.77 | 18.00 | e | 24.73 | a | 29.18 | b | 34.22 | h | 38.74 | c | 41.39 | c | 40.90 | 33.56 | l | 32.19 | d | 29.23 | 24.13 | 30.63 | b | ||||
2019 | 25.00 | 16.46 | 20.48 | 30.40 | 34.00 | 37.37 | 42.06 | 41.48 | 39.76 | a | 28.38 | b | 26.67 | 23.58 | 30.47 | |||||||||||
2020 | 26.74 | 20.03 | 21.52 | 29.57 | 36.94 | 41.00 | g | 41.29 | 40.16 | 40.53 | 31.35 | 23.00 | 24.90 | 30.55 | a | |||||||||||
2021 | 23.29 | 23.71 | 20.68 | 24.17 | 32.61 | 43.60 | 41.90 | 42.48 | 35.80 | 31.48 | 30.10 | 25.23 | 31.25 | |||||||||||||
2022 | 21.35 | 21.25 | 26.90 | 24.63 | 31.61 | 39.60 | 44.13 | 45.10 | 40.33 | 37.77 | 22.40 | 20.35 | 31.29 | |||||||||||||
2023 | 20.74 | 15.89 | 19.45 | 26.20 | 33.65 | 37.03 | 40.74 | 45.03 | 38.63 | 34.53 | a | 29.67 | 33.33 | y | 31.05 | a | ||||||||||
2024 | 24.39 | 25.34 | 16.57 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.87 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.16 | 23.23 | 25.15 | 28.36 | 34.34 | 38.49 | 42.31 | 41.67 | 38.45 | 32.77 | 27.83 | 22.10 | 31.39 | |||||||||||||
S.D. | 3.74 | 3.80 | 2.72 | 2.46 | 2.06 | 2.35 | 2.37 | 2.08 | 2.38 | 2.42 | 2.63 | 3.95 | 0.95 | |||||||||||||
SKEW | -0.31 | -0.20 | -0.57 | -0.19 | 0.20 | 0.40 | 0.27 | 0.38 | -0.18 | 0.29 | -1.04 | -1.09 | 0.70 | |||||||||||||
MAX | 28.97 | 29.70 | 28.83 | 32.82 | 37.81 | 43.60 | 46.76 | 45.96 | 41.96 | 37.77 | 32.23 | 27.84 | 33.16 | |||||||||||||
MIN | 15.73 | 15.89 | 19.45 | 24.03 | 30.81 | 33.71 | 37.63 | 37.61 | 34.04 | 28.38 | 20.50 | 9.77 | 30.27 | |||||||||||||
YRS | 24 | 26 | 25 | 24 | 21 | 22 | 24 | 26 | 24 | 27 | 27 | 28 | 12 |