YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | 26.74 | 31.41 | 34.56 | 46.05 | 54.31 | 57.36 | a | 62.82 | a | 62.13 | 56.55 | 50.10 | 33.23 | 30.74 | 45.50 | |||||||||||
1953 | 35.63 | 33.59 | 37.66 | 43.48 | a | 47.87 | a | 54.09 | c | 62.81 | 62.73 | 55.78 | 47.56 | 39.30 | 31.88 | b | 46.03 | |||||||||
1954 | 27.63 | 34.95 | 33.25 | a | 41.29 | a | 52.38 | a | 54.57 | 63.73 | 60.05 | 55.72 | a | 44.40 | b | 40.10 | a | 28.27 | 44.70 | |||||||
1955 | 27.87 | 25.84 | 27.48 | b | 38.23 | 47.00 | 58.57 | 63.95 | 62.39 | 54.90 | 47.14 | b | 30.93 | b | 25.89 | 42.52 | ||||||||||
1956 | 28.16 | 25.47 | 32.37 | a | 45.57 | 53.48 | b | 57.15 | 66.92 | e | 60.85 | 56.60 | 44.48 | 37.33 | d | 34.90 | a | 45.27 | ||||||||
1957 | 25.00 | d | ----- | z | 43.97 | p | 45.87 | 59.39 | 58.86 | b | 62.71 | 61.27 | c | 58.47 | a | 46.69 | b | 33.31 | d | 31.94 | 48.35 | b | ||||
1958 | 28.90 | 38.02 | a | 36.16 | 41.73 | 57.83 | b | 62.31 | a | 66.24 | 66.57 | a | 54.53 | a | 47.15 | 34.16 | a | 34.44 | 47.34 | |||||||
1959 | 31.38 | b | 31.23 | 34.19 | 41.97 | 46.12 | a | 59.02 | a | 63.27 | 59.90 | 53.73 | 44.21 | 30.92 | 27.62 | a | 43.63 | |||||||||
1960 | 20.97 | 26.45 | 34.15 | 42.43 | 48.77 | 56.33 | 66.07 | a | 59.60 | b | 56.23 | b | 45.28 | a | 33.68 | 26.08 | 43.00 | |||||||||
1961 | 27.26 | 34.27 | 35.39 | 40.73 | 49.97 | a | 62.00 | 64.56 | 68.29 | 49.72 | 41.58 | 29.57 | 26.29 | 44.14 | ||||||||||||
1962 | 20.32 | 28.91 | 30.57 | a | 44.22 | 48.02 | 56.12 | 61.15 | 60.95 | 57.04 | b | 46.00 | a | 36.73 | 30.67 | h | 44.55 | a | ||||||||
1963 | 16.18 | 34.95 | 37.06 | 41.33 | a | 51.77 | 56.30 | 61.87 | 64.60 | 61.47 | a | 48.21 | 35.82 | 27.61 | 44.76 | |||||||||||
1964 | 26.76 | 26.10 | 30.66 | 38.13 | 47.02 | 55.95 | 64.47 | 58.92 | 50.55 | 45.47 | 33.98 | 24.61 | 41.89 | |||||||||||||
1965 | 29.25 | a | 29.20 | 29.19 | 43.70 | 47.35 | 55.05 | a | 61.74 | 61.71 | 48.02 | 47.50 | a | 37.88 | 27.13 | 43.14 | ||||||||||
1966 | 27.29 | 27.50 | 32.42 | 41.27 | 51.13 | 53.60 | 61.00 | 61.50 | 58.15 | 42.47 | 35.82 | 31.52 | 43.64 | |||||||||||||
1967 | 30.55 | 30.21 | 32.77 | 39.23 | 47.92 | a | 58.48 | ----- | z | 64.98 | 59.18 | 43.37 | 34.22 | 25.45 | 42.40 | a | ||||||||||
1968 | 24.69 | 33.79 | 38.33 | b | 41.08 | e | 48.58 | 56.38 | 64.13 | 60.53 | 53.47 | 41.60 | 34.05 | 24.06 | 43.39 | |||||||||||
1969 | 19.97 | 28.05 | 33.92 | 43.12 | a | 52.16 | 59.05 | 61.24 | 62.15 | 54.47 | 40.97 | 34.58 | 28.53 | 43.18 | ||||||||||||
1970 | 26.35 | 33.55 | 33.26 | 37.35 | 49.58 | 60.05 | b | 64.16 | 62.13 | 48.20 | 41.42 | 35.35 | 23.58 | 42.92 | ||||||||||||
1971 | 26.42 | 28.68 | 29.82 | 39.75 | 51.07 | a | 53.48 | 62.44 | 65.81 | 47.87 | 40.58 | 31.62 | 23.61 | 41.76 | ||||||||||||
1972 | 21.43 | a | 28.19 | 37.27 | 37.77 | 50.80 | c | 57.80 | 61.52 | 64.74 | 50.15 | 44.50 | 35.22 | a | 21.92 | 42.61 | ||||||||||
1973 | 24.13 | 31.12 | b | 36.76 | 42.53 | a | 51.50 | 56.07 | 63.00 | 62.97 | 54.23 | 43.87 | 32.35 | 31.35 | 44.16 | |||||||||||
1974 | 22.61 | 32.34 | 33.61 | 42.17 | 47.85 | 61.00 | 62.44 | 60.98 | 55.72 | 44.90 | 37.27 | 28.66 | 44.13 | |||||||||||||
1975 | 27.45 | a | 27.84 | 32.92 | a | 37.33 | 46.77 | a | 56.23 | 68.82 | a | 59.02 | a | 55.03 | 44.35 | 32.63 | 29.71 | c | 43.18 | |||||||
1976 | 28.82 | a | 28.78 | 32.75 | a | 42.60 | 52.37 | 53.98 | 62.18 | 60.84 | 58.02 | 45.12 | a | 36.28 | 26.52 | e | 44.02 | |||||||||
1977 | 22.93 | a | 33.50 | 34.50 | 47.17 | 47.63 | 61.22 | 61.74 | 65.33 | a | 52.37 | 43.71 | 32.63 | 32.17 | g | 45.70 | a | |||||||||
1978 | 32.17 | b | 33.88 | 39.87 | 44.08 | 48.45 | 58.55 | 63.34 | 60.44 | 53.73 | 44.84 | 29.18 | 19.85 | a | 44.03 | |||||||||||
1979 | 14.18 | a | 30.22 | a | 37.37 | 41.47 | a | 50.76 | 57.43 | 64.24 | 64.76 | 57.09 | a | 47.19 | 31.33 | 31.65 | 43.97 | |||||||||
1980 | 20.17 | a | 33.14 | 35.23 | 48.11 | b | 51.91 | b | 55.58 | 63.42 | 58.05 | 54.52 | a | 45.63 | 36.25 | 31.52 | a | 44.46 | ||||||||
1981 | 32.76 | 32.28 | a | 40.03 | 43.93 | a | 50.05 | 53.90 | 61.66 | 65.79 | 55.62 | 42.63 | 38.45 | 29.11 | 45.52 | |||||||||||
1982 | 29.32 | l | 24.70 | c | 36.50 | b | 39.12 | a | 47.88 | c | 59.72 | 62.40 | 63.90 | 53.76 | a | 43.47 | a | 30.91 | a | 26.59 | b | 44.45 | a | |||
1983 | 30.23 | 33.88 | 39.87 | a | 44.00 | l | 51.36 | b | 57.29 | a | 60.97 | 66.18 | a | 50.68 | 44.18 | 36.82 | 19.39 | 44.62 | a | |||||||
1984 | 26.79 | 31.64 | a | 36.52 | 41.45 | b | 46.98 | a | 55.00 | 63.14 | c | 64.31 | 52.98 | 41.60 | 33.45 | b | 20.38 | b | 42.85 | |||||||
1985 | 23.05 | 23.38 | 32.35 | a | 45.00 | 52.48 | 56.09 | a | 67.26 | 59.29 | 49.10 | a | 40.70 | a | 23.31 | d | 18.88 | a | 40.91 | |||||||
1986 | 24.33 | a | 26.02 | 36.00 | a | 42.72 | 51.10 | b | 63.03 | a | 58.13 | a | 66.83 | b | 50.93 | a | 46.20 | d | 32.70 | 24.63 | d | 43.55 | ||||
1987 | 24.80 | a | 31.14 | 36.95 | 48.98 | c | 54.09 | b | 59.63 | c | 63.03 | 59.58 | 56.97 | a | 45.82 | a | 35.88 | 28.96 | e | 45.49 | ||||||
1988 | 24.58 | a | 31.84 | a | 36.71 | 45.50 | 50.75 | a | 60.74 | a | 61.55 | a | 61.78 | d | 54.26 | a | 48.72 | d | 36.79 | d | 26.73 | c | 45.00 | |||
1989 | 26.39 | 21.89 | a | 34.19 | 43.38 | b | 47.41 | c | 58.48 | a | 63.24 | d | 60.03 | a | 54.69 | c | 43.68 | c | 36.73 | d | 28.90 | a | 43.25 | |||
1990 | 31.45 | 28.17 | b | 36.56 | 45.61 | h | 48.74 | 56.73 | 64.38 | e | 64.27 | 60.18 | e | 41.87 | 34.73 | f | 19.60 | f | 48.04 | c | ||||||
1991 | 24.54 | f | 34.79 | 34.26 | h | 42.75 | h | 48.66 | b | 54.00 | 63.19 | b | 65.12 | a | 55.73 | f | 43.38 | b | 33.39 | k | 28.92 | f | 51.52 | f | ||
1992 | 29.48 | a | 35.48 | c | 43.30 | f | 46.89 | l | 52.98 | j | 61.72 | c | 60.93 | c | 61.11 | d | 52.76 | c | 47.20 | d | 34.11 | g | 23.62 | a | 46.54 | d |
1993 | 22.53 | a | 25.16 | c | 36.02 | a | 41.43 | 53.90 | j | 56.34 | b | 56.34 | b | 60.73 | c | 53.33 | f | 46.05 | c | 29.61 | c | 28.55 | a | 40.28 | b | |
1994 | 31.38 | a | 27.45 | 36.29 | b | 43.52 | j | 54.23 | g | 56.38 | 66.03 | 65.57 | a | 57.27 | h | 43.70 | a | 29.42 | e | 26.03 | a | 42.47 | c | |||
1995 | 25.55 | 32.37 | a | 35.25 | a | 40.93 | b | 50.92 | f | 55.43 | a | 62.72 | b | 59.38 | e | 58.33 | j | 40.32 | c | 35.65 | 27.91 | c | 41.55 | b | ||
1996 | 27.60 | 25.68 | a | 34.55 | b | 41.88 | b | 46.66 | o | 56.21 | k | 65.04 | e | 62.12 | f | 53.80 | o | 41.23 | k | 33.06 | f | 26.67 | j | 38.95 | g | |
1997 | 25.18 | 30.04 | b | 34.24 | b | 38.33 | j | 47.50 | r | 57.06 | c | 62.10 | a | 66.12 | e | 53.87 | k | 43.52 | k | 36.88 | f | 27.03 | b | 43.11 | e | |
1998 | 28.20 | a | 33.68 | c | 36.37 | 41.92 | j | 52.54 | f | 56.27 | 68.88 | c | 65.48 | e | 59.87 | o | 43.44 | m | 36.11 | g | 25.38 | c | 44.89 | e | ||
1999 | 29.40 | 29.34 | c | 34.96 | e | 36.24 | m | 45.40 | u | 55.07 | b | 60.25 | e | 66.48 | c | 54.31 | q | 44.00 | o | 37.37 | o | 27.91 | d | 43.35 | e | |
2000 | 27.19 | e | 31.22 | b | 36.35 | 42.88 | n | 51.06 | n | 55.50 | f | 62.09 | d | 63.27 | e | 50.00 | k | 42.25 | q | 28.23 | q | 24.24 | l | 44.03 | g | |
2001 | 25.66 | 27.52 | a | 34.42 | f | 39.00 | d | 52.17 | k | 55.45 | k | 64.12 | b | 64.57 | d | 57.71 | i | 42.72 | h | 36.07 | p | 26.55 | u | 44.17 | g | |
2002 | 27.44 | o | 26.31 | t | 29.86 | x | 37.69 | q | 47.77 | t | 59.54 | p | 66.36 | f | 59.38 | g | 55.06 | d | 40.38 | b | 33.28 | c | 30.27 | e | 39.75 | h |
2003 | 30.48 | a | 29.48 | c | 37.17 | g | 42.48 | b | 47.02 | f | 59.89 | k | 66.47 | n | 65.34 | l | 55.52 | e | 47.17 | a | 28.31 | a | 29.23 | 37.52 | e | |
2004 | 26.10 | e | 30.25 | c | 37.42 | a | 45.00 | f | 50.32 | c | 61.87 | g | 65.69 | b | 64.47 | b | 52.80 | b | 45.04 | c | 33.65 | 29.15 | 43.49 | b | ||
2005 | 27.87 | 30.98 | 38.40 | 42.91 | a | 51.34 | 54.50 | b | 66.05 | i | 63.27 | 52.42 | e | ----- | z | ----- | z | 22.83 | a | 42.73 | c | |||||
2006 | 31.93 | a | 22.81 | o | 36.88 | n | 42.52 | 51.50 | 59.21 | a | 67.55 | 63.24 | b | 55.42 | 43.68 | a | 34.33 | a | 25.45 | 47.48 | b | |||||
2007 | 20.50 | b | 30.52 | 36.94 | 42.88 | 50.71 | 57.43 | 70.16 | 62.98 | 54.90 | 42.95 | 33.15 | d | 26.22 | d | 44.11 | ||||||||||
2008 | 21.24 | 30.05 | a | 32.03 | 36.32 | 48.34 | 54.52 | 63.52 | 63.21 | 53.90 | a | 43.29 | 36.08 | 22.21 | e | 42.06 | ||||||||||
2009 | 23.74 | 28.45 | 30.21 | 39.82 | 50.40 | 58.52 | 64.90 | 64.76 | 59.42 | 41.15 | n | ----- | z | 21.08 | 44.13 | b | ||||||||||
2010 | 30.72 | d | 33.14 | 38.25 | a | 42.70 | 46.90 | 56.07 | 62.85 | ----- | z | 55.82 | 46.05 | 36.07 | g | 26.84 | 43.93 | b | ||||||||
2011 | 26.60 | 26.81 | b | 34.95 | 36.90 | 47.26 | 54.67 | 62.60 | 66.26 | 59.48 | 46.31 | 31.98 | 26.68 | 43.37 | ||||||||||||
2012 | 31.28 | v | 29.69 | 33.65 | 43.60 | 49.52 | 58.05 | 67.71 | 65.57 | b | 57.70 | 44.32 | 45.71 | w | 29.66 | 47.95 | b | |||||||||
2013 | 23.60 | a | 31.25 | x | 37.29 | s | 39.91 | h | 50.85 | a | 57.00 | b | 67.22 | a | 67.47 | l | 61.50 | n | 42.14 | b | 34.05 | t | 19.90 | u | 48.16 | g |
2014 | 30.32 | q | ----- | z | 37.86 | x | 42.67 | r | 54.14 | q | 56.87 | o | 69.89 | l | 67.67 | s | 58.81 | d | 51.77 | p | 35.36 | s | 29.95 | u | 58.81 | k |
2015 | 31.07 | x | 37.17 | s | 36.68 | t | 46.50 | w | 54.86 | q | 65.67 | u | ----- | z | ----- | z | ----- | z | 51.44 | v | ----- | z | 30.69 | w | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.25 | y | 66.50 | u | ----- | z | 46.06 | v | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.45 | k | 64.91 | i | 65.37 | h | 53.05 | i | 44.35 | h | 37.65 | t | 30.71 | x | ----- | z |
2019 | 26.55 | u | 21.38 | x | 30.65 | r | 40.83 | u | 56.75 | y | 59.03 | k | 63.60 | g | 66.57 | j | 56.06 | e | 38.16 | i | ----- | z | ----- | z | 56.06 | k |
2020 | ----- | z | 24.00 | y | ----- | z | ----- | z | ----- | z | 54.62 | r | 65.06 | o | 67.50 | u | 55.88 | j | 43.10 | k | 38.00 | y | ----- | z | ----- | z |
2021 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.90 | t | 71.74 | h | 65.48 | j | 56.72 | n | 46.12 | n | 33.12 | v | ----- | z | ----- | z |
2022 | ----- | z | ----- | z | ----- | z | ----- | z | 55.08 | y | 57.00 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 26.22 | 30.14 | 34.91 | 42.06 | 50.13 | 57.24 | 63.55 | 62.94 | 54.73 | 44.47 | 33.88 | 26.94 | 43.81 | |||||||||||||
S.D. | 4.11 | 3.36 | 2.75 | 2.84 | 2.72 | 2.41 | 2.53 | 2.51 | 3.17 | 2.31 | 3.16 | 3.65 | 1.32 | |||||||||||||
SKEW | -0.46 | -0.14 | -0.44 | 0.10 | 1.13 | 0.52 | 0.26 | -0.01 | -0.31 | 0.09 | -0.69 | -0.21 | 0.30 | |||||||||||||
MAX | 35.63 | 38.02 | 40.03 | 48.98 | 59.39 | 63.03 | 70.16 | 68.29 | 61.47 | 50.10 | 40.10 | 34.90 | 47.34 | |||||||||||||
MIN | 14.18 | 21.89 | 27.48 | 36.32 | 46.12 | 53.48 | 56.34 | 58.05 | 47.87 | 40.32 | 23.31 | 18.88 | 40.91 | |||||||||||||
YRS | 58 | 58 | 54 | 50 | 50 | 56 | 58 | 57 | 53 | 54 | 48 | 54 | 35 |