YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1961 | 13.68 | l | 20.96 | 27.35 | 28.27 | 41.00 | 52.10 | 56.00 | 55.65 | 45.27 | 33.94 | 25.69 | a | 12.19 | 36.22 | a | ||||||||||
1962 | 13.74 | 26.71 | 21.77 | a | 34.37 | 38.71 | 48.17 | 56.81 | 54.55 | 49.80 | 38.13 | 27.55 | a | 19.32 | 35.80 | |||||||||||
1963 | 6.80 | a | 22.33 | a | 25.87 | 30.87 | 43.06 | 47.93 | a | 58.84 | 55.39 | 51.03 | 41.10 | 27.90 | 14.10 | 35.43 | ||||||||||
1964 | 9.55 | 8.69 | 21.03 | a | 29.39 | b | 41.33 | a | 48.89 | b | 58.74 | 54.10 | a | 49.50 | 36.68 | 25.47 | 17.97 | 33.45 | ||||||||
1965 | 21.94 | 17.43 | 22.48 | b | 31.20 | 38.61 | 46.10 | 55.81 | 52.58 | 45.33 | 34.26 | 28.90 | 22.07 | a | 34.73 | |||||||||||
1966 | 12.94 | 15.25 | 25.71 | 31.73 | 43.00 | 50.47 | 58.65 | 54.34 | b | 47.83 | 34.93 | a | 27.13 | 16.17 | a | 34.85 | ||||||||||
1967 | 9.87 | 20.82 | 26.19 | 29.60 | 37.03 | 49.78 | c | 58.94 | 53.71 | 48.07 | 35.45 | 24.14 | a | 11.38 | b | 33.75 | ||||||||||
1968 | 12.50 | a | 24.21 | 26.48 | 27.33 | 38.11 | c | 47.50 | 54.57 | a | 52.20 | a | 42.87 | 33.48 | b | 22.80 | 11.32 | 32.78 | ||||||||
1969 | 22.87 | a | 20.19 | a | 20.61 | 32.73 | 42.37 | a | 47.10 | a | 58.40 | a | 57.77 | 48.63 | 34.73 | a | 22.70 | 20.90 | 35.75 | |||||||
1970 | 15.74 | 21.19 | a | 22.06 | 25.62 | a | 39.40 | a | 48.03 | 57.61 | 58.13 | 46.03 | a | 29.61 | 23.60 | 15.97 | 33.58 | |||||||||
1971 | 10.87 | 14.44 | a | 22.94 | 28.55 | a | 37.29 | 48.08 | f | 56.15 | d | 52.97 | 43.57 | 34.48 | 24.28 | a | 15.89 | c | 31.04 | a | ||||||
1972 | 13.06 | 17.97 | 26.00 | 28.57 | 37.03 | 48.66 | a | 57.26 | 53.55 | 48.13 | 40.93 | b | 24.63 | 15.67 | a | 34.29 | ||||||||||
1973 | ----- | z | 22.18 | 25.26 | 26.52 | a | 39.71 | 47.40 | 54.35 | 52.42 | 44.17 | 33.65 | 25.20 | 15.10 | 35.09 | a | ||||||||||
1974 | 14.81 | 15.75 | 28.55 | 28.13 | 40.55 | 51.40 | 52.45 | 48.84 | 44.21 | a | 38.77 | 25.13 | 11.65 | 33.35 | ||||||||||||
1975 | 11.13 | a | 18.46 | 25.47 | a | 27.53 | 36.10 | 44.73 | 54.74 | 52.77 | 45.93 | 33.71 | 20.63 | 15.81 | 32.25 | |||||||||||
1976 | 11.13 | 23.62 | 21.77 | 31.86 | a | 41.52 | 49.00 | 55.26 | 53.42 | 46.97 | 30.90 | a | 18.07 | 9.35 | 32.74 | |||||||||||
1977 | 8.87 | a | 18.39 | 21.10 | a | 34.24 | a | 40.74 | 51.43 | 56.90 | 57.03 | 50.20 | 37.23 | a | 26.20 | 21.68 | 35.34 | |||||||||
1978 | 21.30 | a | 23.64 | 29.10 | 34.38 | a | 39.74 | 51.13 | 56.42 | 52.74 | 47.20 | 38.65 | 31.41 | a | 14.65 | 36.70 | ||||||||||
1979 | 10.28 | b | 15.73 | b | 27.74 | 32.83 | a | 41.26 | 48.37 | 54.81 | 53.71 | 48.93 | 36.81 | 21.90 | a | 18.32 | 34.22 | |||||||||
1980 | 24.67 | a | 24.55 | 24.13 | 29.76 | a | 40.00 | 49.47 | 56.10 | 55.52 | 45.10 | 32.19 | 21.76 | a | 21.13 | a | 35.36 | |||||||||
1981 | 17.52 | 17.82 | 23.94 | 32.80 | 35.23 | 49.69 | d | 56.77 | 54.48 | 48.66 | a | 36.40 | a | 23.90 | 18.14 | b | 34.61 | |||||||||
1982 | 15.20 | f | 18.00 | e | 26.73 | a | 29.50 | 36.57 | a | 46.96 | c | 54.87 | 56.06 | 48.96 | d | 31.93 | b | 25.40 | 20.24 | b | 35.93 | a | ||||
1983 | 18.23 | 22.04 | 26.80 | p | 27.00 | 36.55 | 43.24 | a | 54.48 | 56.48 | 49.83 | 38.80 | a | 24.87 | 19.19 | 35.52 | a | |||||||||
1984 | 13.57 | a | 19.31 | 22.39 | 30.17 | a | 43.35 | 49.10 | 57.76 | b | 55.97 | 48.30 | 34.39 | 25.43 | 22.04 | c | 35.15 | |||||||||
1985 | 17.00 | a | 17.61 | 29.45 | b | 33.73 | d | 41.78 | d | 50.00 | 55.45 | 53.77 | 43.80 | 36.93 | c | 28.23 | 16.74 | 35.37 | ||||||||
1986 | 19.65 | 24.32 | 28.35 | 35.13 | 41.10 | 51.10 | 54.65 | 55.10 | 45.07 | b | 33.58 | 26.10 | 20.19 | 36.19 | ||||||||||||
1987 | 12.70 | a | 23.25 | 23.03 | 31.66 | a | 39.90 | 47.80 | 53.17 | a | 52.29 | 44.43 | 36.68 | 24.97 | 15.74 | 33.80 | ||||||||||
1988 | 9.00 | 21.72 | 22.25 | c | 32.40 | 41.26 | 51.23 | 56.16 | 57.00 | 45.27 | 36.90 | 24.23 | 15.00 | a | 34.37 | |||||||||||
1989 | 10.84 | 21.46 | 28.71 | 34.63 | 41.65 | 49.41 | a | 56.41 | b | 54.00 | 48.23 | 34.90 | 21.47 | 12.45 | 34.51 | |||||||||||
1990 | 11.61 | 17.50 | b | 28.70 | a | 35.82 | b | 40.38 | b | 52.12 | d | 55.81 | 53.74 | 50.37 | 33.68 | 25.47 | 8.42 | 34.47 | ||||||||
1991 | 12.68 | 21.96 | 25.07 | a | 31.13 | 39.26 | 47.57 | 55.48 | b | 55.13 | 46.83 | 34.52 | 24.10 | a | 21.23 | 34.58 | ||||||||||
1992 | 13.26 | 26.34 | 28.31 | b | 34.86 | a | 43.74 | 49.20 | 54.29 | 53.42 | 46.37 | 36.32 | 20.03 | 11.14 | b | 34.77 | ||||||||||
1993 | 24.52 | 24.96 | 25.61 | 30.77 | 39.42 | 47.00 | 54.58 | 52.16 | 41.53 | 30.23 | 10.87 | 8.35 | 32.50 | |||||||||||||
1994 | 11.06 | 13.00 | 26.32 | 30.90 | 43.38 | g | 51.54 | d | 57.80 | a | 56.68 | 48.52 | a | 34.90 | a | 24.27 | 19.83 | a | 34.07 | a | ||||||
1995 | 20.35 | 25.46 | 27.32 | 29.90 | a | 38.32 | 45.24 | a | 52.77 | a | 57.42 | 48.03 | a | 32.03 | a | 25.14 | b | 17.18 | i | 36.55 | a | |||||
1996 | 16.94 | 23.31 | 21.81 | 30.17 | a | 42.70 | a | 51.47 | 56.71 | 54.94 | 44.37 | 34.00 | 25.00 | 18.13 | 34.96 | |||||||||||
1997 | 14.68 | 22.18 | 24.87 | 29.50 | 41.84 | 49.23 | 54.26 | 55.03 | 49.80 | 32.39 | 23.60 | 14.26 | 34.30 | |||||||||||||
1998 | 19.90 | 21.68 | 25.19 | 28.45 | a | 38.71 | 45.53 | 57.26 | 55.58 | 50.43 | 36.61 | 26.13 | 17.26 | 35.23 | ||||||||||||
1999 | 18.45 | 20.32 | 27.77 | 31.17 | 41.19 | 47.55 | a | 56.13 | 54.26 | 45.10 | 32.35 | 23.47 | 13.10 | 34.24 | ||||||||||||
2000 | 18.77 | 24.79 | 25.32 | 34.39 | b | 41.97 | 51.53 | 56.19 | 55.35 | 47.83 | 37.23 | 20.60 | 17.55 | 35.96 | ||||||||||||
2001 | 14.48 | 21.57 | 26.19 | 34.00 | 42.55 | 51.10 | 57.97 | 55.19 | 47.17 | 36.48 | 28.00 | 14.55 | 35.77 | |||||||||||||
2002 | 16.67 | a | 15.86 | 21.32 | 35.07 | a | 41.84 | 50.43 | 57.06 | 53.80 | a | 49.30 | 35.93 | a | 23.93 | 19.19 | 35.03 | |||||||||
2003 | 19.77 | a | 21.43 | 24.61 | 30.57 | 39.19 | 48.60 | 58.97 | 55.32 | 47.03 | a | 39.42 | 26.90 | 18.16 | 35.83 | |||||||||||
2004 | 17.94 | 16.76 | 30.10 | a | 33.93 | a | 40.32 | c | 45.41 | c | 52.87 | 52.90 | 45.80 | 34.67 | a | 24.82 | b | 15.62 | b | 34.26 | ||||||
2005 | 23.83 | a | 27.43 | 25.37 | a | 32.73 | 42.13 | 46.00 | a | 55.93 | b | 54.52 | b | 49.55 | a | 37.59 | d | 24.21 | b | 14.13 | 36.12 | |||||
2006 | 14.72 | b | 15.14 | 26.70 | a | 35.20 | 42.93 | c | 51.89 | b | 58.48 | b | 56.52 | d | 43.13 | 36.34 | b | 23.75 | f | 13.77 | a | 35.89 | a | |||
2007 | 11.52 | b | 21.71 | 27.97 | 33.66 | a | 42.77 | e | 51.12 | d | 58.07 | a | 56.96 | d | 49.48 | c | 34.70 | a | 25.07 | b | 17.71 | c | 35.89 | |||
2008 | 12.60 | a | 18.96 | e | 23.81 | e | 28.76 | e | 36.70 | h | 47.40 | j | 56.72 | b | 55.26 | h | 47.14 | i | 33.79 | g | 25.63 | 18.87 | 26.48 | e | ||
2009 | 18.53 | a | 20.23 | b | 27.29 | 31.61 | b | 46.03 | a | 49.57 | 57.29 | 54.65 | 47.18 | b | 34.29 | 25.20 | 12.13 | 35.33 | ||||||||
2010 | 14.90 | a | 21.57 | 25.58 | 33.33 | 39.06 | 50.41 | a | 59.48 | 55.19 | 50.07 | 38.55 | 21.70 | 23.97 | 36.15 | |||||||||||
2011 | 11.94 | 16.29 | 26.39 | 32.83 | 35.58 | e | 49.70 | 57.53 | a | 57.90 | 48.90 | a | 35.40 | a | 26.13 | 13.97 | 34.38 | |||||||||
2012 | 20.55 | 21.14 | 25.40 | a | 35.73 | 42.42 | 52.17 | 58.13 | 56.87 | 48.37 | 35.00 | a | 23.24 | a | 15.29 | 36.19 | ||||||||||
2013 | 8.40 | a | 16.79 | 25.74 | 32.43 | 41.93 | a | 52.90 | 58.19 | 57.29 | 50.77 | 33.10 | 26.36 | b | 16.65 | 35.05 | ||||||||||
2014 | 15.64 | c | 22.43 | 25.26 | 29.52 | a | 39.40 | a | 49.47 | 58.57 | a | 53.83 | a | 51.17 | 37.41 | d | 22.34 | a | 23.13 | a | 35.68 | |||||
2015 | 19.55 | 23.44 | a | 29.73 | a | 33.04 | c | 41.03 | 53.10 | 56.55 | 55.03 | 50.23 | d | 40.17 | b | 25.59 | c | 16.62 | b | 37.01 | ||||||
2016 | 16.17 | a | 21.66 | 26.74 | 33.97 | 39.07 | a | 55.10 | 57.47 | a | 53.71 | 47.50 | 39.83 | b | 30.96 | b | 20.77 | 36.91 | ||||||||
2017 | 23.87 | 27.93 | 28.57 | a | 32.80 | 39.87 | a | 51.70 | 57.13 | 54.55 | 48.50 | 37.45 | 30.57 | b | 17.52 | b | 37.54 | |||||||||
2018 | 16.63 | a | 21.89 | a | 25.47 | a | 35.63 | 42.32 | 52.80 | 57.74 | d | 56.23 | a | 49.87 | 39.17 | a | 20.68 | b | 18.57 | c | 36.42 | |||||
2019 | 18.94 | 21.37 | a | 30.68 | 34.77 | 37.77 | 47.83 | a | 56.73 | e | 55.26 | d | 50.28 | a | 30.11 | d | 23.86 | b | 21.32 | c | 35.74 | |||||
2020 | 18.87 | a | 22.17 | 29.25 | c | 32.22 | c | 42.88 | e | 51.19 | c | 56.04 | c | 56.15 | k | 45.90 | i | 32.63 | d | 24.94 | m | 11.97 | a | 33.02 | c | |
2021 | 17.55 | i | 17.13 | e | 25.16 | f | 34.08 | r | 54.11 | v | 56.79 | k | 59.06 | 56.31 | e | 49.35 | d | 34.50 | g | 25.91 | g | 21.42 | e | 40.65 | g | |
2022 | 15.90 | b | 13.64 | f | 24.46 | e | 33.96 | d | 41.39 | c | 54.93 | c | 59.72 | b | 56.82 | c | 51.65 | d | 37.38 | e | 20.70 | j | 20.08 | f | 41.80 | c |
2023 | 20.52 | h | 18.96 | c | 25.61 | m | 29.83 | f | 42.45 | k | 49.46 | q | 58.55 | i | 57.25 | g | 48.89 | k | ----- | z | ----- | z | 22.07 | b | 20.51 | j |
2024 | 17.33 | a | 24.11 | b | 26.52 | d | 35.48 | e | 36.50 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.86 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 15.62 | 20.56 | 25.67 | 31.76 | 40.37 | 49.48 | 56.54 | 54.82 | 47.60 | 35.50 | 24.54 | 16.67 | 34.97 | |||||||||||||
S.D. | 4.44 | 3.70 | 2.53 | 2.63 | 2.25 | 2.47 | 1.74 | 1.76 | 2.41 | 2.69 | 3.16 | 3.78 | 1.19 | |||||||||||||
SKEW | 0.20 | -0.51 | -0.19 | -0.33 | -0.30 | -0.14 | -0.36 | -0.44 | -0.49 | -0.04 | -1.18 | -0.21 | -0.26 | |||||||||||||
MAX | 24.67 | 27.93 | 30.68 | 35.82 | 46.03 | 55.10 | 59.72 | 58.13 | 51.65 | 41.10 | 31.41 | 23.97 | 37.54 | |||||||||||||
MIN | 6.80 | 8.69 | 20.61 | 25.62 | 35.23 | 43.24 | 52.45 | 48.84 | 41.53 | 29.61 | 10.87 | 8.35 | 32.25 | |||||||||||||
YRS | 59 | 63 | 61 | 62 | 59 | 59 | 62 | 60 | 60 | 60 | 58 | 61 | 50 |