YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | 21.59 | n | 27.63 | a | 28.50 | e | 37.78 | g | 45.07 | c | 47.32 | e | 58.73 | e | 57.93 | d | 48.33 | f | 37.21 | g | 30.06 | l | 22.93 | q | 44.20 | f |
1952 | 21.10 | j | 22.05 | g | 24.19 | j | 40.43 | w | 45.15 | e | 49.81 | i | 56.40 | f | 53.36 | t | 46.28 | l | 41.88 | o | 22.58 | r | 23.47 | n | 45.15 | k |
1953 | 32.58 | l | 28.74 | i | 31.76 | f | 34.46 | f | 39.35 | e | 45.24 | e | 56.15 | d | 55.11 | d | 51.41 | c | 41.73 | e | 36.05 | h | 24.53 | l | 48.16 | f |
1954 | 28.00 | k | 30.45 | h | 27.78 | h | 35.17 | l | 43.33 | j | 47.32 | h | 54.95 | l | 51.23 | i | 46.71 | p | 36.41 | n | 30.36 | s | 22.19 | j | ----- | z |
1955 | 17.14 | j | 21.20 | h | 27.55 | i | 34.86 | i | 42.14 | i | ----- | 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 | 54.50 | 58.97 | 57.29 | 52.40 | 40.48 | 28.33 | 27.87 | 45.69 | e | |||||||
1958 | 23.48 | 33.82 | 31.68 | 37.53 | 51.74 | 54.66 | a | 60.00 | 61.06 | 47.90 | 41.19 | 30.97 | 28.77 | 41.90 | ||||||||||||
1959 | 27.00 | 27.75 | 28.58 | 35.67 | 38.32 | 50.17 | 56.26 | 51.06 | 48.67 | 41.65 | 28.93 | 24.60 | a | 38.22 | ||||||||||||
1960 | 20.23 | 25.83 | 33.65 | 38.07 | 43.03 | 52.17 | 62.87 | 52.42 | 50.60 | 41.97 | 34.17 | 25.06 | 40.00 | |||||||||||||
1961 | 26.29 | 33.54 | 35.16 | 37.13 | 45.35 | 58.27 | 62.03 | 64.33 | a | 47.20 | 39.58 | 29.80 | 24.13 | 41.90 | ||||||||||||
1962 | 14.00 | 25.89 | 29.90 | 40.60 | 44.20 | a | 52.03 | 57.74 | 55.77 | 51.77 | 41.74 | 33.27 | 28.35 | 39.61 | ||||||||||||
1963 | 16.52 | 33.43 | 32.32 | 36.50 | 47.97 | 50.03 | 54.90 | 57.16 | 57.77 | 47.97 | 36.50 | b | 23.94 | 41.25 | ||||||||||||
1964 | 21.12 | g | 18.11 | j | 26.41 | i | 34.69 | a | 41.77 | a | 52.03 | 60.10 | a | 55.42 | 46.57 | 42.22 | d | 29.74 | k | 27.43 | h | 47.54 | e | |||
1965 | 26.10 | k | 26.54 | 26.19 | 39.17 | a | 42.00 | a | 52.10 | 60.30 | a | 59.13 | 45.47 | 44.10 | b | 37.75 | j | 25.76 | j | 43.89 | c | |||||
1966 | 26.86 | j | 23.47 | i | 31.09 | h | 37.32 | b | 48.10 | 52.83 | 58.94 | 59.00 | a | 54.93 | 39.07 | d | 36.10 | j | 26.14 | j | 50.03 | e | ||||
1967 | 27.67 | j | 28.21 | i | 31.70 | k | 34.13 | g | 42.74 | 52.43 | 62.58 | 63.32 | 56.70 | 40.76 | f | 32.35 | j | 19.65 | k | 55.56 | g | |||||
1968 | 22.68 | i | 31.40 | i | 33.81 | j | 32.97 | a | 42.97 | 51.00 | 60.55 | 56.61 | 49.10 | 39.67 | d | 32.00 | k | 25.71 | j | 47.55 | e | |||||
1969 | 23.09 | i | 26.33 | j | 27.76 | j | 36.89 | b | 46.45 | 53.17 | 57.81 | 56.87 | 51.73 | 35.37 | d | 32.61 | l | 26.57 | j | 48.33 | e | |||||
1970 | 28.24 | j | 30.37 | i | 30.73 | a | 30.87 | 43.84 | 55.23 | 59.94 | 59.74 | 44.23 | 37.57 | a | 34.63 | 24.65 | 42.14 | b | ||||||||
1971 | 25.87 | 27.57 | 27.77 | 36.30 | 45.39 | 50.87 | 58.97 | 63.16 | 44.90 | 36.45 | 30.37 | 22.97 | 39.22 | |||||||||||||
1972 | 22.42 | 26.04 | a | 33.81 | 34.37 | 45.35 | 53.30 | 55.87 | 59.93 | a | 46.47 | 41.61 | 33.73 | 19.06 | 39.33 | |||||||||||
1973 | 23.94 | 30.50 | 31.48 | 35.87 | 45.20 | a | 50.73 | 59.42 | 57.77 | 49.10 | 39.71 | 34.07 | b | 29.87 | 40.64 | |||||||||||
1974 | 20.03 | 28.50 | d | 32.97 | 35.60 | 41.26 | 53.43 | 56.94 | 55.42 | 49.07 | 39.74 | 34.63 | 24.77 | 39.36 | ||||||||||||
1975 | 18.65 | 26.93 | 27.97 | a | 31.60 | 39.63 | a | 48.73 | 62.55 | 55.80 | a | 51.47 | 40.84 | 29.00 | 24.58 | 38.15 | ||||||||||
1976 | 23.87 | a | 25.41 | 26.52 | 35.13 | 42.68 | 44.67 | 57.17 | a | 53.74 | 50.11 | b | 37.23 | 29.43 | b | 20.10 | 37.17 | |||||||||
1977 | 12.20 | a | 22.46 | 25.80 | a | 35.21 | a | 39.52 | 54.00 | 53.61 | 59.10 | 48.50 | 41.16 | 29.73 | 30.35 | 37.64 | ||||||||||
1978 | 29.65 | 30.00 | 34.84 | 40.00 | 41.61 | 49.79 | a | 56.65 | 53.45 | 47.60 | 39.26 | 26.37 | 19.35 | 39.05 | ||||||||||||
1979 | 8.97 | 27.29 | 31.58 | 36.33 | 42.65 | 48.40 | 56.90 | 58.16 | 50.63 | 42.68 | 27.18 | h | 28.07 | p | 40.36 | b | ||||||||||
1980 | 22.80 | k | 33.78 | f | 30.32 | 39.10 | 46.03 | 48.70 | 57.90 | 53.52 | 49.83 | 39.21 | c | 32.87 | 27.54 | c | 42.50 | b | ||||||||
1981 | 29.35 | 28.79 | 34.71 | 37.79 | b | 43.19 | 49.50 | 55.07 | a | 59.87 | 50.83 | a | 36.92 | f | 37.03 | 29.90 | 41.46 | a | ||||||||
1982 | 18.32 | 21.71 | 32.15 | e | 33.14 | i | 40.86 | c | 52.08 | d | 57.56 | f | 58.72 | b | 49.46 | b | 40.10 | j | 29.66 | a | 26.19 | 36.57 | c | |||
1983 | 29.21 | b | 32.52 | a | 36.77 | a | 36.96 | g | 44.86 | b | 49.63 | c | 54.41 | b | 62.40 | a | 46.15 | c | 41.76 | n | 35.30 | c | 21.38 | g | 43.47 | c |
1984 | 20.10 | b | 25.53 | j | 33.63 | d | 37.80 | e | 44.22 | h | 48.27 | h | 60.48 | d | 61.97 | a | 48.13 | 38.17 | g | 32.62 | a | 16.74 | 38.93 | d | ||
1985 | 14.06 | 18.25 | 27.97 | b | 39.83 | a | 46.87 | a | 53.14 | a | ----- | z | 53.00 | c | 45.31 | a | 36.93 | b | 19.93 | 6.45 | 32.89 | a | ||||
1986 | 21.57 | h | 35.24 | c | 39.47 | a | 38.40 | 45.43 | a | 56.11 | b | 55.87 | 61.50 | c | 47.68 | e | 40.10 | a | 33.57 | b | 22.23 | 43.24 | a | |||
1987 | 21.11 | c | 32.54 | b | 34.32 | 41.63 | 47.87 | 54.30 | 55.80 | a | 54.17 | a | 49.43 | 41.61 | 34.07 | 25.48 | 41.03 | |||||||||
1988 | 18.67 | a | 28.48 | 29.29 | 40.30 | 44.26 | 53.41 | a | 56.10 | 53.61 | 44.90 | 43.00 | a | 31.67 | 16.81 | d | 38.38 | |||||||||
1989 | 14.14 | c | 10.64 | 30.58 | 38.86 | h | 42.90 | b | 52.33 | 56.45 | 55.39 | 47.59 | a | 40.32 | c | 26.31 | n | 20.94 | o | 38.93 | c | |||||
1990 | 23.13 | p | 19.40 | m | 28.88 | n | 38.13 | o | 41.19 | e | 49.13 | 55.90 | 56.26 | 52.72 | a | 38.06 | o | 24.93 | o | 11.69 | r | 51.04 | g | |||
1991 | 12.06 | o | 25.93 | m | 26.24 | n | 31.59 | m | 38.43 | j | 43.59 | c | 53.74 | 57.94 | 50.63 | c | 37.82 | n | 29.71 | p | 24.53 | p | 51.47 | h | ||
1992 | 23.23 | r | 32.15 | p | 34.00 | q | 40.24 | m | 48.55 | i | 53.93 | a | ----- | z | 54.32 | 44.19 | d | 39.25 | o | 23.83 | r | 21.83 | m | 50.82 | i | |
1993 | 14.00 | q | 15.88 | l | 29.61 | m | 33.00 | k | 49.12 | f | 44.92 | d | 47.00 | 52.86 | c | 48.23 | d | 40.44 | o | 24.69 | q | 24.06 | n | 48.25 | h | |
1994 | 27.80 | p | 24.69 | o | 32.11 | m | 40.25 | r | 47.32 | f | 48.59 | a | 57.74 | 56.48 | b | 49.46 | d | 38.23 | r | 20.77 | q | 22.53 | n | 53.07 | h | |
1995 | 29.12 | o | 29.60 | m | 31.61 | m | 36.38 | q | 44.55 | k | 49.48 | a | 56.19 | 51.26 | 49.00 | h | 34.13 | p | 32.15 | q | 25.00 | q | 52.31 | i | ||
1996 | 25.56 | o | 25.93 | n | 33.24 | n | 40.56 | l | 43.06 | n | 50.44 | c | 58.13 | a | 54.10 | b | 43.86 | h | 41.35 | n | 30.86 | p | 25.67 | s | 54.23 | i |
1997 | 20.64 | q | 24.27 | m | 31.47 | p | 36.73 | o | 48.15 | k | 51.00 | c | 56.45 | b | 57.17 | b | 53.95 | i | 38.82 | n | 34.67 | r | 21.19 | o | 54.87 | i |
1998 | 28.07 | p | 30.67 | m | 30.67 | p | 38.22 | l | 43.12 | g | 47.41 | a | 61.13 | 57.28 | b | 54.73 | h | 36.71 | n | 31.00 | s | 18.89 | l | 55.27 | i | |
1999 | 22.80 | p | 23.31 | l | 28.89 | m | 30.60 | j | 37.50 | k | 48.47 | 51.24 | b | 54.65 | 43.04 | g | 33.65 | k | 31.32 | k | 21.00 | j | 51.45 | i | ||
2000 | 20.84 | l | 25.90 | i | 30.35 | h | 42.90 | i | 45.86 | i | 52.96 | e | 57.56 | d | 57.18 | c | 46.83 | 40.48 | j | 25.50 | l | 24.31 | o | 53.63 | h | |
2001 | 20.88 | o | 22.67 | m | 34.14 | q | 37.18 | m | 44.78 | d | 48.89 | c | 57.86 | b | 60.11 | d | 52.24 | i | 38.65 | n | 31.78 | l | 22.44 | m | 52.91 | h |
2002 | 21.75 | k | 20.58 | i | 27.28 | m | 34.42 | k | 41.87 | h | 52.96 | b | 61.35 | h | 53.86 | b | 52.17 | f | 35.00 | n | 31.55 | j | 30.62 | j | 53.41 | j |
2003 | 28.50 | k | 22.44 | l | 29.85 | k | 33.90 | j | 37.05 | i | 47.71 | f | 60.11 | c | 61.13 | a | 51.65 | d | 52.26 | l | 25.00 | l | 28.90 | k | 57.63 | i |
2004 | 21.74 | l | 26.83 | k | 34.41 | i | 38.38 | i | 44.19 | e | 52.48 | g | 59.21 | g | 58.74 | d | 47.26 | g | 43.57 | q | 29.37 | k | 28.52 | j | 51.47 | j |
2005 | 23.79 | l | 24.71 | k | 32.73 | i | 36.24 | i | 43.20 | k | 47.96 | e | 57.21 | g | 57.79 | c | 45.86 | b | 40.76 | j | 28.58 | k | 18.00 | n | 50.53 | i |
2006 | 26.00 | n | 23.06 | k | 32.15 | k | 37.18 | m | 45.28 | f | 53.33 | c | 62.35 | e | 53.89 | c | 49.65 | d | 37.82 | n | 30.53 | m | 20.62 | r | 54.81 | h |
2007 | 17.06 | o | 27.00 | k | 31.75 | o | 33.47 | k | 44.25 | k | 53.78 | l | 63.33 | g | 56.12 | n | 49.00 | j | 38.89 | m | 30.40 | t | 23.41 | n | ----- | z |
2008 | 16.27 | p | 21.62 | u | 25.38 | o | 29.71 | p | 45.67 | s | 52.31 | q | 59.35 | k | 56.83 | g | 47.40 | y | 37.70 | u | 34.60 | 21.30 | d | 27.95 | j | |
2009 | 23.40 | u | 27.23 | b | 30.12 | e | 36.27 | 45.84 | 54.45 | a | 60.19 | 58.84 | 53.83 | a | 36.97 | a | 31.36 | b | 18.67 | d | 41.25 | a | ||||
2010 | 29.45 | 31.36 | 30.90 | 36.17 | 39.48 | 51.87 | 55.71 | 56.26 | 50.97 | 44.71 | 30.33 | 27.77 | 40.42 | |||||||||||||
2011 | 21.52 | 24.41 | a | 32.90 | j | 33.20 | o | 40.71 | g | 46.92 | q | 57.06 | 60.03 | 55.07 | 42.42 | 29.73 | 20.42 | 38.83 | d | |||||||
2012 | 25.06 | 27.72 | ----- | z | 39.43 | 43.73 | t | 49.03 | 60.42 | 60.32 | 52.60 | 40.55 | 35.43 | 27.97 | a | 41.85 | b | |||||||||
2013 | 12.42 | 24.93 | 31.10 | 34.10 | 44.90 | 52.90 | 63.71 | 62.52 | ----- | z | 38.26 | 32.21 | a | 17.81 | 37.71 | a | ||||||||||
2014 | 25.29 | 31.68 | ----- | z | 38.95 | j | 46.10 | 50.73 | 64.55 | 62.68 | 54.57 | 47.00 | 28.30 | 35.32 | c | 44.62 | b | |||||||||
2015 | 28.87 | 32.48 | a | 35.84 | 37.03 | 49.84 | 59.83 | 61.97 | 62.65 | 53.60 | 48.77 | 29.83 | 26.77 | 43.96 | ||||||||||||
2016 | 27.58 | 31.03 | 37.03 | 41.07 | a | 45.87 | 53.90 | 56.07 | a | 57.42 | 48.97 | 44.19 | 36.41 | a | 15.45 | 41.25 | ||||||||||
2017 | 15.23 | 29.71 | 37.65 | 38.00 | 45.97 | 53.77 | 65.06 | 62.42 | 52.77 | 36.71 | 35.63 | 22.61 | 41.29 | |||||||||||||
2018 | 30.48 | 23.00 | 32.13 | 38.83 | 50.29 | 52.67 | 62.26 | 59.87 | 50.03 | 40.68 | 29.00 | 23.74 | 41.08 | |||||||||||||
2019 | 25.81 | 25.50 | 29.42 | g | 41.79 | a | 46.42 | 52.10 | 59.58 | 60.00 | 51.50 | 32.48 | 30.00 | 30.26 | 41.40 | a | ||||||||||
2020 | 29.65 | 24.83 | 32.26 | 37.13 | 45.71 | 52.67 | 58.39 | 60.52 | f | 53.03 | 38.65 | 31.13 | 24.35 | 38.89 | a | |||||||||||
2021 | 28.58 | 25.07 | 31.71 | 38.00 | 45.45 | 58.90 | 67.65 | 57.94 | 49.93 | 42.65 | 36.10 | 26.61 | 42.38 | |||||||||||||
2022 | 21.42 | 21.93 | 31.10 | 33.40 | 42.55 | 51.40 | 62.97 | 64.84 | 54.47 | 43.84 | 25.07 | 22.65 | 39.63 | |||||||||||||
2023 | 23.94 | 23.11 | 28.29 | 34.73 | 50.71 | 53.40 | 62.03 | 61.23 | 52.07 | 42.55 | 32.73 | 29.03 | 41.15 | |||||||||||||
2024 | 25.23 | 31.24 | 31.84 | 35.80 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.03 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 22.33 | 27.38 | 31.72 | 37.01 | 44.46 | 51.54 | 58.54 | 57.80 | 49.93 | 40.79 | 31.67 | 24.01 | 40.17 | |||||||||||||
S.D. | 5.82 | 4.68 | 3.22 | 2.54 | 2.99 | 3.17 | 3.48 | 3.36 | 3.15 | 3.19 | 3.46 | 5.23 | 1.65 | |||||||||||||
SKEW | -0.48 | -1.05 | 0.27 | -0.21 | 0.19 | -0.07 | -0.22 | 0.06 | 0.21 | 0.15 | -0.90 | -0.84 | 0.14 | |||||||||||||
MAX | 30.48 | 35.24 | 39.47 | 41.79 | 51.74 | 59.83 | 67.65 | 64.84 | 57.77 | 48.77 | 37.03 | 35.32 | 43.96 | |||||||||||||
MIN | 8.97 | 10.64 | 25.80 | 30.87 | 38.32 | 43.59 | 47.00 | 51.06 | 44.19 | 32.48 | 19.93 | 6.45 | 37.17 | |||||||||||||
YRS | 38 | 41 | 40 | 42 | 50 | 63 | 61 | 66 | 57 | 44 | 41 | 40 | 24 |