YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | 18.26 | 20.03 | 23.58 | 28.73 | 38.29 | 42.17 | a | 42.10 | a | 41.29 | 34.20 | 27.77 | 20.03 | 23.94 | 30.03 | |||||||||||
1953 | 29.97 | 23.64 | 27.32 | 31.23 | 33.65 | 39.48 | c | 40.87 | 43.55 | 34.40 | 29.42 | 29.23 | 26.97 | a | 32.48 | |||||||||||
1954 | 20.42 | 24.89 | 21.71 | 29.90 | 35.55 | 40.33 | 44.84 | 43.45 | 38.59 | a | 29.00 | b | 30.59 | a | 19.61 | 31.57 | ||||||||||
1955 | 20.97 | 15.39 | 16.72 | b | 27.97 | 33.03 | 42.30 | 48.42 | 39.90 | 36.77 | 34.57 | a | 24.82 | b | 17.55 | 29.87 | ||||||||||
1956 | 20.32 | 16.00 | 20.90 | 30.30 | 39.40 | a | 41.83 | 47.15 | e | 39.74 | 37.93 | 33.19 | 30.38 | a | 30.00 | 32.26 | ||||||||||
1957 | 20.37 | d | ----- | z | 37.25 | o | 35.63 | 49.03 | 45.43 | b | 43.13 | 41.57 | c | 36.93 | a | 35.45 | b | 24.04 | d | 25.61 | 35.72 | b | ||||
1958 | 20.00 | 29.07 | a | 24.32 | 29.33 | 38.10 | a | 47.76 | a | 47.74 | 45.61 | 37.43 | 30.16 | 26.59 | a | 28.55 | 33.72 | |||||||||
1959 | 23.48 | 24.11 | 25.13 | 30.33 | 34.57 | a | 42.03 | 41.74 | 40.81 | 41.83 | 32.65 | 20.03 | 18.10 | 31.23 | ||||||||||||
1960 | 10.39 | 16.41 | 22.39 | 31.43 | 36.65 | 39.67 | 44.50 | a | 43.86 | b | 36.48 | a | 30.68 | 25.27 | 16.39 | 29.51 | ||||||||||
1961 | 16.58 | 28.82 | 26.10 | 30.73 | 37.03 | a | 43.40 | 44.68 | 45.65 | 33.50 | 29.81 | 18.17 | 19.13 | 31.13 | ||||||||||||
1962 | 8.81 | 18.46 | 19.33 | a | 28.90 | 36.77 | 40.43 | 41.06 | 42.65 | 38.10 | a | 33.68 | 28.90 | 23.23 | 30.03 | |||||||||||
1963 | 4.58 | 24.43 | 26.35 | 30.80 | 36.77 | 43.80 | 43.13 | 43.77 | 42.30 | 32.94 | 27.80 | 19.45 | 31.34 | |||||||||||||
1964 | 18.55 | 12.66 | 20.61 | 26.93 | 34.61 | 43.30 | 45.58 | 42.03 | 35.07 | 30.74 | 25.47 | 16.29 | 29.32 | |||||||||||||
1965 | 22.45 | 19.79 | 14.03 | 30.27 | 32.68 | 39.62 | a | 39.94 | 45.00 | 32.23 | 29.90 | a | 28.50 | 18.61 | 29.42 | |||||||||||
1966 | 19.61 | 15.61 | 18.97 | 26.93 | 32.94 | 39.93 | 41.55 | 41.23 | 39.17 | 28.10 | 27.10 | 25.65 | 29.73 | |||||||||||||
1967 | 24.71 | 19.18 | 22.61 | 27.63 | 33.50 | a | 43.07 | ----- | z | 41.13 | 37.40 | 31.06 | 23.47 | 17.39 | 29.20 | a | ||||||||||
1968 | 14.71 | 22.45 | 25.72 | b | 28.58 | d | 35.48 | 43.17 | 43.10 | 43.23 | 39.23 | 28.19 | 26.30 | 16.39 | 30.55 | |||||||||||
1969 | 10.52 | 18.11 | 20.00 | 29.90 | a | 36.52 | 44.43 | 41.03 | 39.26 | 38.33 | 28.58 | 23.00 | 20.61 | 29.19 | ||||||||||||
1970 | 19.19 | 22.75 | 21.94 | 27.53 | 35.13 | 45.21 | b | 46.45 | 40.39 | 33.10 | 27.55 | 26.53 | 14.42 | 30.02 | ||||||||||||
1971 | 19.06 | 17.00 | 18.29 | 27.07 | 36.30 | a | 40.67 | 44.00 | 44.74 | 32.00 | 26.32 | 24.60 | 15.68 | 28.81 | ||||||||||||
1972 | 11.03 | 17.97 | 27.58 | 26.70 | 36.54 | c | 44.50 | 45.23 | 46.29 | 35.70 | 30.13 | 27.38 | a | 14.16 | 30.27 | |||||||||||
1973 | 14.45 | 18.23 | b | 26.42 | 30.27 | 36.97 | 41.97 | 43.00 | 43.00 | 38.57 | 31.10 | 27.40 | 25.68 | 31.42 | ||||||||||||
1974 | 13.90 | 24.46 | 22.48 | 31.23 | 36.48 | 44.97 | 46.39 | 41.77 | 35.47 | 26.00 | 29.50 | 21.19 | 31.15 | |||||||||||||
1975 | 20.23 | a | 16.36 | 22.23 | a | 27.33 | 34.43 | a | 44.00 | 53.23 | a | 42.10 | a | 35.27 | 33.84 | 22.80 | 21.55 | b | 31.12 | |||||||
1976 | 19.26 | 18.55 | 21.57 | a | 31.40 | 37.35 | 37.77 | 43.55 | 43.97 | 38.87 | 27.67 | a | 25.03 | 15.84 | 30.07 | |||||||||||
1977 | 12.83 | a | 21.39 | 25.74 | 34.17 | 36.90 | 45.00 | 46.00 | 46.68 | 38.80 | 30.19 | 25.33 | 23.65 | 32.22 | ||||||||||||
1978 | 24.74 | 27.00 | 28.42 | 35.83 | 37.13 | 43.47 | 47.35 | 44.68 | 40.07 | 26.94 | 20.40 | 9.83 | a | 32.15 | ||||||||||||
1979 | 2.60 | a | 22.93 | a | 24.71 | 33.48 | a | 36.52 | 40.97 | 45.87 | 46.00 | 37.31 | a | 32.90 | 20.57 | 25.45 | 30.78 | |||||||||
1980 | 9.17 | a | 24.59 | 27.61 | 36.34 | a | 39.50 | a | 43.03 | 47.42 | 40.19 | 39.21 | a | 29.29 | 27.37 | 24.97 | a | 32.39 | ||||||||
1981 | 25.35 | 23.11 | a | 26.97 | 32.45 | a | 38.45 | 41.83 | 44.61 | 46.00 | 37.60 | 31.45 | 28.90 | 22.35 | 33.26 | |||||||||||
1982 | 19.19 | d | 14.88 | c | 26.97 | b | 28.28 | a | 34.50 | c | 45.57 | 47.06 | 46.58 | 38.28 | a | 31.80 | a | 22.79 | a | 19.34 | b | 31.27 | ||||
1983 | 21.71 | 24.93 | 30.53 | a | 30.55 | a | 36.76 | b | 44.00 | 47.06 | 49.93 | a | 35.23 | 30.45 | 30.47 | 10.77 | 32.70 | |||||||||
1984 | 17.87 | 22.07 | a | 28.06 | 30.71 | b | 35.67 | a | 39.43 | 43.04 | c | 44.77 | 35.10 | 28.55 | 27.18 | b | 11.17 | b | 30.30 | |||||||
1985 | 14.94 | 13.32 | 19.17 | a | 33.57 | 38.45 | 40.79 | a | 46.81 | 43.42 | 35.72 | a | 28.87 | 15.77 | d | 7.23 | a | 28.17 | ||||||||
1986 | 15.27 | a | 18.93 | 26.37 | a | 30.17 | 37.83 | b | 47.28 | a | 42.57 | a | 46.41 | b | 39.59 | a | 31.00 | d | 26.40 | 15.11 | d | 31.41 | ||||
1987 | 15.37 | a | 22.32 | 27.65 | 33.59 | c | 39.93 | b | 43.96 | c | 49.19 | 41.81 | 36.69 | a | 24.77 | a | 25.87 | 22.38 | e | 31.96 | ||||||
1988 | 15.33 | a | 20.25 | a | 28.39 | 33.03 | 39.07 | a | 49.66 | a | 44.94 | 42.19 | d | 36.83 | a | 33.33 | d | 31.42 | d | 18.86 | c | 32.77 | ||||
1989 | 19.06 | 10.26 | a | 25.45 | 30.43 | b | 34.82 | c | 43.66 | a | 45.37 | d | 44.83 | a | 37.15 | c | 31.39 | c | 28.92 | d | 22.20 | a | 31.13 | |||
1990 | 25.39 | 17.56 | a | 23.16 | 33.09 | h | 36.77 | 43.77 | 47.38 | e | 48.71 | 41.10 | a | 29.97 | 28.83 | f | 8.44 | d | 32.23 | b | ||||||
1991 | 14.12 | e | 25.11 | 24.61 | h | 29.64 | h | 36.93 | b | 41.20 | 46.59 | b | 46.90 | a | 36.04 | f | 26.90 | b | 24.84 | k | 20.48 | f | 33.96 | e | ||
1992 | 22.30 | a | 23.92 | c | 28.76 | f | 34.00 | l | 36.62 | j | 45.74 | c | 46.50 | c | 42.67 | d | 34.63 | c | 32.04 | c | 26.88 | f | 14.97 | a | 32.85 | d |
1993 | 13.61 | 14.00 | c | 24.30 | a | 31.07 | 39.67 | j | 44.04 | b | 44.55 | b | 44.75 | c | 35.25 | f | 32.14 | c | 20.59 | c | 22.63 | a | 29.17 | b | ||
1994 | 25.35 | 18.07 | 22.79 | b | 31.10 | i | 38.67 | g | 41.53 | 47.06 | 45.60 | a | 38.00 | h | 31.00 | a | 23.96 | e | 19.26 | 30.52 | c | |||||
1995 | 17.13 | 23.33 | a | 24.67 | a | 28.71 | b | 37.12 | f | 43.24 | a | 47.14 | b | 43.62 | e | 41.10 | i | 30.00 | c | 28.87 | 21.04 | c | 30.77 | b | ||
1996 | 22.35 | 14.93 | a | 23.93 | b | 30.93 | b | 35.88 | o | 39.37 | k | 46.23 | e | 43.28 | f | 37.80 | o | 29.50 | k | 26.67 | f | 21.14 | i | 27.67 | g | |
1997 | 17.23 | 20.31 | b | 26.55 | b | 27.59 | h | 35.92 | r | 44.44 | c | 46.67 | a | 48.19 | e | 38.32 | k | 32.45 | k | 27.12 | f | 20.34 | b | 31.96 | e | |
1998 | 21.90 | a | 24.68 | c | 25.97 | 30.50 | j | 39.50 | e | 43.93 | 52.17 | b | 46.73 | e | 44.20 | o | 31.06 | m | 30.83 | g | 19.54 | c | 34.30 | d | ||
1999 | 24.39 | 22.40 | c | 22.54 | e | 22.88 | m | 31.80 | u | 41.41 | a | 43.38 | e | 49.14 | c | 34.38 | q | 27.94 | o | 28.33 | o | 22.70 | d | 32.28 | e | |
2000 | 20.19 | e | 23.74 | b | 27.39 | 28.50 | n | 37.24 | n | 40.25 | f | 44.56 | d | 43.00 | e | 34.37 | k | 28.00 | p | 20.08 | q | 15.37 | l | 31.78 | g | |
2001 | 17.74 | 17.67 | a | 23.40 | f | 30.12 | d | 36.75 | k | 41.26 | k | 47.86 | b | 45.33 | d | 38.86 | i | 29.65 | h | 26.86 | p | 18.60 | u | 31.74 | g | |
2002 | 20.69 | o | 11.75 | t | 15.29 | x | 23.69 | q | 30.18 | t | 42.36 | p | 48.68 | f | 41.25 | g | 36.42 | d | 24.87 | a | 24.33 | c | 25.23 | e | 27.71 | h |
2003 | 24.33 | a | 22.00 | c | 28.75 | g | 31.00 | b | 34.00 | f | 43.11 | k | 46.29 | n | 46.74 | l | 37.96 | e | 33.47 | a | 21.10 | a | 24.23 | 27.73 | e | |
2004 | 21.00 | e | 21.19 | c | 25.47 | a | 30.83 | f | 37.32 | c | 45.52 | g | 47.79 | b | 48.55 | b | 40.04 | b | 33.50 | c | 26.50 | 23.13 | 32.45 | b | ||
2005 | 20.84 | 18.39 | 26.39 | 30.70 | 38.32 | 41.32 | b | 47.95 | i | 43.77 | 35.76 | e | ----- | z | ----- | z | 15.80 | a | 30.14 | c | ||||||
2006 | 27.83 | a | 10.54 | o | 27.59 | n | 30.87 | 36.10 | 44.83 | a | 48.23 | 43.93 | b | 38.23 | 30.33 | a | 27.76 | a | 18.52 | 34.66 | b | |||||
2007 | 11.55 | b | 24.14 | 26.87 | 31.37 | 36.68 | 43.80 | 51.35 | 44.16 | 37.73 | 32.35 | 24.15 | d | 21.25 | c | 32.12 | ||||||||||
2008 | 13.13 | 21.71 | a | 23.39 | 25.73 | 34.97 | 40.50 | 45.65 | 46.19 | 37.03 | a | 30.65 | 29.07 | 16.58 | e | 30.38 | ||||||||||
2009 | 15.90 | 17.82 | 21.35 | 27.87 | 36.16 | 44.63 | 47.39 | 48.71 | 40.93 | 28.82 | n | ----- | z | 14.32 | 31.51 | b | ||||||||||
2010 | 25.07 | d | 25.25 | 26.10 | 32.47 | 35.45 | 44.57 | 45.81 | ----- | z | 43.47 | 35.19 | 29.57 | g | 21.32 | 33.47 | b | |||||||||
2011 | 21.48 | 21.00 | b | 27.45 | 28.97 | 35.35 | 42.60 | 46.48 | 47.19 | 41.00 | 36.58 | 25.27 | 19.61 | 32.75 | ||||||||||||
2012 | 23.89 | v | 21.55 | 25.35 | 31.27 | 36.71 | 45.67 | 50.90 | 46.10 | b | 38.93 | 33.39 | 38.57 | w | 25.06 | 35.49 | b | |||||||||
2013 | 16.87 | a | 23.50 | x | 24.42 | s | 29.50 | h | 36.67 | a | 43.64 | b | 48.20 | a | 49.00 | l | 44.75 | n | 28.97 | b | 23.70 | t | 9.80 | u | 34.87 | g |
2014 | 22.64 | q | ----- | z | 26.00 | x | 29.42 | r | 36.79 | q | 42.67 | o | 50.16 | l | 49.75 | s | 40.81 | d | 35.27 | p | 23.08 | q | 22.10 | u | 40.81 | k |
2015 | 21.43 | x | 25.78 | s | 25.55 | t | 29.57 | w | 39.29 | q | 45.22 | u | ----- | z | ----- | z | ----- | z | 32.33 | v | ----- | z | 24.50 | w | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.33 | y | 44.60 | u | ----- | z | 34.67 | v | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.53 | k | 48.09 | i | 49.61 | h | 38.57 | i | 33.48 | h | 33.50 | t | 26.86 | x | ----- | z |
2019 | 19.30 | u | 17.25 | x | 17.92 | r | 31.67 | u | 46.00 | y | 46.47 | k | 49.29 | g | 51.19 | j | 44.80 | e | 28.82 | i | ----- | z | ----- | z | 44.80 | k |
2020 | ----- | z | 20.75 | y | ----- | z | ----- | z | ----- | z | 45.83 | r | 47.88 | o | 52.40 | u | 41.75 | j | 33.25 | k | 29.80 | y | ----- | z | ----- | z |
2021 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.90 | t | 53.96 | h | 51.14 | j | 42.50 | n | 36.12 | n | 27.50 | v | ----- | z | ----- | z |
2022 | ----- | z | ----- | z | ----- | z | ----- | z | 43.33 | y | 46.40 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.25 | 20.50 | 24.19 | 30.41 | 36.67 | 43.05 | 45.72 | 44.26 | 37.65 | 30.57 | 25.54 | 19.64 | 31.03 | |||||||||||||
S.D. | 5.47 | 4.06 | 3.31 | 2.39 | 2.48 | 2.27 | 2.78 | 2.59 | 2.69 | 2.66 | 3.50 | 4.93 | 1.31 | |||||||||||||
SKEW | -0.51 | -0.22 | -0.77 | 0.42 | 2.32 | 0.19 | 0.26 | 0.11 | 0.23 | -0.06 | -0.63 | -0.38 | -0.03 | |||||||||||||
MAX | 29.97 | 29.07 | 30.53 | 36.34 | 49.03 | 49.66 | 53.23 | 49.93 | 44.80 | 36.58 | 31.42 | 30.00 | 33.72 | |||||||||||||
MIN | 2.60 | 10.26 | 14.03 | 25.73 | 32.68 | 37.77 | 39.94 | 39.26 | 32.00 | 24.77 | 15.77 | 7.23 | 28.17 | |||||||||||||
YRS | 60 | 58 | 54 | 51 | 51 | 56 | 58 | 57 | 53 | 54 | 48 | 57 | 39 |