YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1953 | ----- | z | ----- | z | ----- | z | 29.40 | 39.52 | 45.96 | e | 55.30 | d | 46.48 | h | 36.96 | b | 28.10 | 22.10 | 10.00 | a | 33.42 | d | ||||
1954 | 11.86 | b | 15.55 | f | 20.39 | 30.53 | 39.45 | 46.45 | a | 57.32 | 52.81 | 45.93 | 35.26 | 19.63 | 12.35 | 33.82 | a | |||||||||
1955 | 11.26 | 12.82 | 21.03 | 28.73 | 39.77 | 44.33 | 52.06 | 54.42 | 42.73 | 30.45 | 18.17 | 15.19 | 30.92 | |||||||||||||
1956 | 16.39 | 12.21 | 21.06 | 27.57 | 38.17 | g | ----- | z | 52.43 | x | ----- | z | 42.45 | j | 34.39 | 15.90 | 11.87 | 19.91 | e | |||||||
1957 | 21.42 | 27.43 | 28.35 | 31.47 | 40.03 | 48.07 | 56.52 | 54.68 | 42.07 | 36.90 | 23.73 | 20.13 | a | 35.90 | ||||||||||||
1958 | 13.61 | 23.25 | 25.00 | 31.97 | 41.97 | 47.71 | b | 52.55 | 56.00 | 48.37 | 35.06 | 23.47 | 15.68 | 34.55 | ||||||||||||
1959 | 13.19 | 19.61 | 21.60 | a | 34.40 | 41.55 | 51.60 | 53.65 | 53.81 | 38.23 | 30.29 | 18.57 | 16.97 | 32.79 | ||||||||||||
1960 | 10.10 | 17.55 | 22.87 | 30.97 | 36.10 | 46.57 | 52.58 | 52.87 | 47.20 | 34.10 | 24.47 | 16.23 | 32.63 | |||||||||||||
1961 | 13.32 | 20.50 | 27.81 | 31.67 | 41.61 | 50.77 | 54.32 | 54.45 | 42.37 | 29.26 | 23.47 | 10.63 | a | 33.35 | ||||||||||||
1962 | 10.77 | 22.32 | 17.94 | 33.67 | 36.58 | 46.57 | 54.87 | 49.94 | 47.07 | 34.84 | 24.50 | 18.94 | 33.17 | |||||||||||||
1963 | 5.32 | 20.11 | 24.71 | 30.31 | a | 41.16 | 45.73 | 56.90 | 55.55 | 48.07 | 36.16 | 25.47 | 12.97 | 33.54 | ||||||||||||
1964 | 8.97 | 13.75 | a | 21.55 | 30.40 | 42.94 | 47.53 | 57.45 | 52.90 | 48.00 | 30.97 | 22.70 | 17.84 | 32.92 | ||||||||||||
1965 | 20.77 | 18.61 | 23.74 | 34.20 | 40.84 | 47.90 | 57.16 | 52.48 | 45.47 | 31.68 | 27.67 | 21.26 | 35.15 | |||||||||||||
1966 | 15.16 | 19.46 | 24.39 | 34.17 | 41.32 | 49.17 | 57.39 | 54.10 | 45.13 | 32.03 | 24.67 | 18.39 | 34.61 | |||||||||||||
1967 | 13.26 | 20.50 | 27.32 | 34.30 | 40.94 | 49.73 | 59.32 | 54.23 | 46.50 | 32.13 | 23.40 | 14.94 | 34.71 | |||||||||||||
1968 | 17.35 | 25.03 | 26.52 | 29.83 | 38.55 | 47.63 | 54.26 | 52.81 | 41.70 | 32.68 | 22.60 | 11.16 | 33.34 | |||||||||||||
1969 | 19.42 | 19.75 | 21.32 | 35.50 | 41.29 | 47.48 | a | 57.97 | 56.87 | 47.73 | 36.16 | 22.47 | 19.32 | 35.44 | ||||||||||||
1970 | 13.00 | 20.50 | 23.32 | 29.53 | 39.84 | 47.17 | 55.23 | 56.87 | 43.82 | b | 30.42 | e | 20.72 | a | 15.06 | 32.96 | ||||||||||
1971 | 10.32 | 18.59 | a | 23.81 | 30.47 | 38.61 | ----- | z | 56.16 | 51.74 | 39.53 | 35.58 | 23.83 | 14.74 | 31.22 | a | ||||||||||
1972 | 16.10 | 19.59 | 25.19 | 31.33 | 38.42 | 46.17 | 52.87 | 52.97 | 45.23 | 38.23 | 23.33 | 19.19 | 34.05 | |||||||||||||
1973 | 17.52 | 21.96 | 27.06 | 28.00 | 40.26 | 47.13 | 54.48 | 52.77 | 43.53 | 33.13 | 24.77 | 17.06 | 33.97 | |||||||||||||
1974 | 15.19 | 14.14 | 32.00 | 30.30 | 39.61 | 50.27 | 55.29 | 50.03 | 43.70 | 38.52 | 24.63 | 12.29 | 33.83 | |||||||||||||
1975 | 8.29 | 22.22 | a | 27.57 | a | 27.67 | 36.00 | 45.37 | 55.23 | 52.29 | 44.10 | 29.77 | 21.27 | 18.77 | 32.38 | |||||||||||
1976 | 10.68 | 22.03 | 26.13 | 32.62 | a | 40.45 | 46.03 | 53.77 | 51.94 | 46.20 | 29.90 | 16.87 | 6.39 | 31.92 | ||||||||||||
1977 | 12.26 | 19.30 | a | 20.29 | 36.27 | 40.61 | 50.70 | 56.35 | 56.00 | 46.93 | 32.94 | 25.97 | 18.58 | 34.68 | ||||||||||||
1978 | 19.48 | 19.75 | 28.00 | 33.33 | 39.00 | 49.70 | 55.13 | 50.45 | 45.00 | 35.42 | 30.80 | 18.00 | 35.34 | |||||||||||||
1979 | 17.48 | 19.54 | 28.29 | 33.21 | b | 41.87 | 47.73 | 52.58 | 52.71 | 44.93 | 33.77 | 20.73 | 16.35 | 34.10 | ||||||||||||
1980 | 24.33 | a | 24.10 | 24.81 | 29.20 | 40.61 | 48.43 | 57.20 | a | ----- | z | 44.67 | 31.47 | a | 20.33 | c | 21.19 | 33.30 | a | |||||||
1981 | 15.48 | 16.50 | 27.35 | 37.73 | 41.68 | 50.33 | f | 57.50 | i | 54.65 | h | 49.41 | h | 36.44 | f | 22.81 | d | 19.67 | d | 25.89 | e | |||||
1982 | 20.55 | 20.50 | 30.14 | c | 34.03 | a | 39.63 | d | 48.21 | b | 57.50 | e | 59.36 | c | 49.43 | g | 31.54 | g | 25.29 | i | 21.91 | t | 38.74 | d | ||
1983 | 20.45 | k | 25.95 | h | 28.86 | j | 30.10 | i | 35.87 | h | 47.15 | j | 56.28 | m | 58.48 | 48.89 | k | 36.17 | h | 24.64 | b | 20.42 | g | 41.56 | j | |
1984 | 15.24 | b | 19.79 | 24.03 | b | 30.83 | a | 44.86 | b | 49.56 | l | 56.17 | b | 55.13 | 47.97 | 34.42 | 23.23 | 17.10 | 33.53 | a | ||||||
1985 | 19.43 | a | 19.79 | 29.68 | 35.13 | 43.58 | 50.07 | 59.67 | a | 55.23 | 45.13 | 36.84 | 27.73 | 17.35 | 36.64 | |||||||||||
1986 | 20.87 | 28.00 | a | 31.84 | 37.80 | 41.32 | 50.40 | 53.74 | 55.53 | a | 41.83 | 32.68 | 25.47 | 24.73 | e | 37.02 | ||||||||||
1987 | 13.53 | a | 24.86 | 25.72 | b | 33.00 | 42.06 | 49.23 | 51.94 | 53.13 | 43.26 | g | 34.90 | 25.53 | 18.39 | c | 33.85 | a | ||||||||
1988 | 13.67 | d | 23.86 | 23.81 | 34.70 | 41.27 | a | 51.70 | 55.55 | 57.06 | 44.73 | 35.13 | 23.17 | a | 14.87 | 34.96 | ||||||||||
1989 | 12.94 | 21.29 | 29.03 | 36.83 | 43.42 | 52.10 | 57.16 | 54.52 | 47.90 | 34.77 | a | 21.73 | 14.68 | 35.53 | ||||||||||||
1990 | 14.52 | 19.41 | a | 30.58 | 36.67 | 41.32 | 48.60 | 54.65 | 51.45 | 49.00 | 34.29 | 25.93 | 13.33 | a | 34.98 | |||||||||||
1991 | 18.03 | 20.71 | 26.94 | 30.60 | 40.52 | 50.57 | 55.30 | a | 55.23 | 47.13 | 32.00 | 26.00 | c | 18.28 | b | 35.11 | ||||||||||
1992 | 15.81 | e | 23.93 | 28.94 | 34.40 | 44.13 | 48.53 | 53.07 | a | 47.27 | a | 42.85 | c | 32.61 | c | 22.62 | d | 8.70 | k | 35.83 | a | |||||
1993 | 22.68 | f | 24.35 | h | 25.45 | b | 33.21 | b | ----- | z | 47.48 | e | 53.59 | b | 55.22 | h | 41.68 | e | 30.84 | f | 21.00 | c | 15.48 | d | 33.98 | e |
1994 | 11.83 | g | 16.64 | f | 25.96 | e | 33.81 | d | 43.22 | m | 49.70 | c | 53.64 | i | 56.30 | d | 45.35 | d | 31.12 | e | 25.71 | w | ----- | z | 40.37 | f |
1995 | 24.71 | x | 25.06 | j | 26.92 | g | 30.43 | i | 39.36 | c | 45.84 | k | 50.69 | o | 56.53 | n | 47.79 | p | 26.33 | j | 23.69 | n | 18.08 | s | 39.36 | k |
1996 | 11.89 | m | 22.84 | j | 22.64 | f | 33.96 | c | 41.53 | a | 50.59 | a | 55.58 | g | 53.54 | g | 42.12 | e | 32.38 | g | 24.28 | e | 14.27 | p | 38.50 | g |
1997 | 16.10 | j | 22.92 | b | 23.86 | b | 29.61 | b | 42.20 | a | 46.57 | b | 52.19 | e | 54.32 | f | 48.42 | f | 31.22 | h | 20.38 | f | 18.05 | l | 36.23 | f |
1998 | 12.59 | i | 20.75 | h | 24.03 | b | 29.37 | c | 37.45 | b | 44.57 | 56.90 | 53.90 | b | 46.55 | h | 35.72 | f | 25.52 | a | 17.56 | m | 38.82 | e | ||
1999 | 16.29 | g | 19.46 | b | 26.37 | d | 29.67 | l | 37.96 | f | 45.69 | a | 55.50 | c | 51.50 | c | 41.84 | e | 28.81 | d | 18.50 | d | 10.80 | p | 35.96 | d |
2000 | 13.19 | j | 22.35 | l | 26.95 | j | 32.94 | m | 41.19 | j | 51.86 | h | 55.00 | l | 55.09 | h | 42.84 | k | 35.41 | i | 16.32 | k | 14.77 | r | ----- | z |
2001 | 11.84 | l | 18.65 | h | 27.32 | c | 32.20 | e | 42.69 | b | 49.00 | c | 57.86 | b | 54.44 | d | 43.22 | c | 30.79 | c | 27.04 | e | 13.52 | h | 40.51 | c |
2002 | 14.89 | c | 15.32 | c | 20.30 | d | 34.30 | c | 39.52 | b | 47.79 | k | 56.00 | 50.46 | c | 46.79 | f | 33.82 | c | 21.96 | g | 17.44 | d | 31.34 | c | |
2003 | 17.31 | e | 20.68 | f | 25.39 | c | 31.40 | 39.80 | a | 46.90 | 56.93 | b | 54.74 | d | 43.74 | c | 34.12 | g | 23.00 | d | 14.82 | c | 35.40 | b | ||
2004 | 17.03 | a | 17.25 | e | 28.90 | b | 35.03 | a | 38.43 | a | 47.25 | b | 51.83 | b | 51.93 | a | 42.72 | a | 34.07 | b | 25.70 | 14.97 | a | 33.76 | ||
2005 | 22.96 | d | 25.69 | b | 26.17 | b | 32.10 | a | 40.43 | c | 47.31 | a | 54.48 | 53.87 | a | 43.96 | c | 35.20 | a | 20.50 | 8.09 | i | 36.61 | a | ||
2006 | 13.14 | b | 14.18 | 25.60 | a | 33.48 | a | 41.77 | 49.93 | 56.70 | a | 55.70 | d | 41.00 | 33.39 | 20.93 | a | 14.42 | 33.35 | |||||||
2007 | 13.57 | a | 19.32 | 25.84 | 31.74 | c | 41.50 | a | 47.60 | 56.39 | 55.79 | c | 46.00 | e | 29.72 | b | 21.04 | b | 18.42 | 33.91 | ||||||
2008 | 13.28 | b | 21.21 | 20.41 | d | 28.58 | d | 40.40 | f | 45.66 | a | 55.97 | 54.86 | b | 43.48 | a | 32.96 | c | 21.47 | 19.03 | 32.45 | a | ||||
2009 | 18.40 | a | 18.29 | 25.33 | a | 30.73 | 43.21 | c | 48.85 | d | 55.52 | b | 50.19 | 44.10 | a | 31.67 | a | 22.17 | 11.93 | a | 33.37 | |||||
2010 | 15.74 | 21.39 | 23.57 | a | 32.07 | 38.00 | 47.86 | b | 56.32 | f | 53.52 | 45.19 | d | 34.29 | 18.83 | 18.42 | 31.72 | a | ||||||||
2011 | 9.60 | a | 12.46 | 23.93 | b | 33.50 | 37.85 | d | 47.89 | b | 56.96 | c | 55.94 | 46.21 | b | 33.89 | d | 22.36 | e | 12.37 | a | 32.75 | ||||
2012 | 16.90 | 18.04 | a | 22.90 | a | 35.11 | b | 39.87 | a | 50.03 | 56.10 | a | 55.87 | 45.86 | a | 30.84 | 18.37 | 12.53 | a | 33.53 | ||||||
2013 | 9.23 | 17.64 | 23.84 | 31.13 | 39.19 | 49.37 | 57.16 | 54.61 | 48.83 | a | 29.58 | 23.27 | 16.19 | 33.34 | ||||||||||||
2014 | 11.35 | 18.29 | 23.81 | 29.67 | 38.35 | 48.73 | 57.50 | a | 52.32 | 49.07 | 33.16 | 21.21 | b | 19.52 | 33.58 | |||||||||||
2015 | 17.65 | 19.43 | 26.61 | 31.10 | 39.94 | 50.90 | 56.68 | 53.13 | 46.07 | 37.97 | a | 22.63 | 17.03 | 34.93 | ||||||||||||
2016 | 15.87 | a | 19.21 | 23.14 | b | 32.20 | 38.48 | 51.07 | 55.23 | 53.35 | 44.03 | 30.87 | 24.97 | 17.13 | 33.80 | |||||||||||
2017 | 22.32 | 23.79 | 25.71 | 32.30 | 39.65 | 49.17 | 57.58 | 53.58 | 44.50 | 31.13 | 23.57 | 11.74 | 34.59 | |||||||||||||
2018 | 10.65 | 18.32 | 22.39 | 33.40 | 40.29 | 49.17 | 56.77 | 53.68 | 45.03 | 36.10 | 19.77 | 15.71 | 33.44 | |||||||||||||
2019 | 16.35 | 17.75 | 28.35 | 32.63 | 36.90 | 47.13 | 55.81 | 52.58 | 45.33 | 26.48 | 17.77 | 19.45 | 33.05 | |||||||||||||
2020 | 15.52 | 19.62 | 27.94 | 31.03 | a | 41.53 | a | 48.27 | 55.53 | a | 52.61 | 40.77 | 27.65 | 23.80 | ----- | z | 34.93 | a | ||||||||
2021 | 14.79 | b | 17.89 | a | 21.77 | 30.14 | a | 40.52 | b | 51.77 | h | 61.37 | d | 56.92 | s | 45.54 | q | 30.40 | a | 21.37 | 15.61 | 28.21 | c | |||
2022 | 14.35 | 14.11 | 22.61 | 32.00 | c | 41.19 | 52.10 | 58.42 | 56.10 | a | 45.07 | 34.19 | 18.62 | a | 16.36 | c | 33.76 | |||||||||
2023 | 17.68 | 18.07 | 25.00 | 29.80 | 42.23 | 46.00 | 55.52 | b | 54.83 | b | 44.40 | 31.93 | a | 20.90 | 18.61 | 33.75 | ||||||||||
2024 | 17.29 | 22.17 | 25.93 | b | 29.00 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.80 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.13 | 19.76 | 25.20 | 32.21 | 40.38 | 48.32 | 55.70 | 53.83 | 44.62 | 32.91 | 22.67 | 16.16 | 33.99 | |||||||||||||
S.D. | 3.87 | 3.43 | 2.96 | 2.42 | 1.87 | 1.90 | 1.98 | 2.18 | 2.58 | 2.67 | 2.83 | 3.25 | 1.20 | |||||||||||||
SKEW | 0.06 | -0.06 | 0.04 | 0.25 | -0.17 | 0.08 | 0.02 | -0.22 | -0.54 | -0.07 | -0.01 | -0.36 | 0.22 | |||||||||||||
MAX | 24.33 | 28.00 | 32.00 | 37.80 | 44.86 | 52.10 | 61.37 | 59.36 | 49.07 | 38.52 | 30.80 | 24.73 | 37.02 | |||||||||||||
MIN | 5.32 | 12.21 | 17.94 | 27.57 | 36.00 | 44.33 | 51.83 | 47.27 | 36.96 | 26.48 | 15.90 | 6.39 | 30.92 | |||||||||||||
YRS | 61 | 61 | 67 | 67 | 64 | 62 | 63 | 61 | 60 | 61 | 65 | 58 | 44 |