YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | 36.00 | w | 44.66 | a | 55.13 | 54.71 | 39.71 | b | 36.48 | 21.80 | 18.52 | 38.72 | e | |||||
1958 | 15.90 | 23.93 | a | 26.45 | 30.63 | 38.77 | 48.27 | 52.32 | 53.55 | 49.86 | b | 36.93 | a | 23.31 | a | 14.45 | 34.53 | |||||||||
1959 | 14.79 | c | 19.52 | a | 18.97 | a | 32.69 | a | 34.29 | 47.00 | 53.54 | c | 55.33 | a | 39.54 | b | 33.32 | 23.30 | 21.90 | 32.85 | ||||||
1960 | 15.16 | 16.26 | b | 25.17 | a | 29.33 | 33.83 | a | 44.41 | a | 52.26 | d | 52.67 | a | 44.81 | c | 35.03 | 23.77 | 16.97 | b | 32.47 | |||||
1961 | 18.35 | 19.11 | 24.61 | 27.73 | 31.81 | 44.79 | b | 51.48 | 52.46 | c | 43.53 | 30.34 | b | 27.29 | b | 21.50 | a | 32.75 | ||||||||
1962 | 19.32 | 24.18 | 19.81 | 29.93 | 33.94 | 40.50 | 54.33 | a | 49.32 | c | 48.66 | a | 35.55 | 25.39 | b | 23.71 | 33.72 | |||||||||
1963 | 15.06 | 21.93 | a | 22.79 | b | 28.93 | 35.67 | a | 38.93 | a | 54.55 | b | 55.60 | a | 48.54 | b | 35.74 | 25.90 | a | 13.61 | 33.10 | |||||
1964 | 9.68 | 11.55 | 22.23 | 28.73 | 36.52 | 40.89 | c | 54.86 | c | 53.12 | f | 50.50 | b | 32.77 | e | 24.36 | b | 19.17 | b | 30.11 | a | |||||
1965 | 21.94 | 18.88 | b | 23.13 | 30.60 | 35.33 | a | 41.11 | c | 54.69 | e | 52.08 | e | 45.52 | e | 29.53 | a | 24.38 | d | 23.13 | a | 33.36 | ||||
1966 | 15.35 | 16.78 | a | 24.07 | b | 31.36 | e | 37.21 | c | 45.27 | 55.13 | 53.83 | a | 46.83 | 31.69 | b | 25.67 | 16.80 | a | 33.33 | ||||||
1967 | 11.40 | a | 20.30 | a | 26.57 | c | 30.79 | f | 34.43 | c | 43.83 | a | 56.03 | b | 52.19 | 48.07 | a | 32.76 | b | 25.90 | a | 19.84 | 33.76 | a | ||
1968 | 20.67 | a | 26.93 | a | 27.69 | b | 29.67 | 35.73 | i | 43.88 | f | 53.52 | d | 52.13 | a | 40.11 | c | 30.21 | c | 23.92 | d | 15.33 | a | 32.02 | b | |
1969 | 24.38 | b | 20.26 | a | 20.67 | a | 29.57 | 35.87 | a | 42.63 | 54.84 | f | 53.09 | h | 44.59 | a | 35.35 | e | 22.93 | a | 18.78 | h | 30.69 | c | ||
1970 | 13.74 | 22.56 | a | 24.68 | 26.91 | h | 35.50 | a | 43.73 | d | 55.43 | c | 53.81 | d | 45.27 | d | 31.03 | 20.29 | b | 16.67 | d | 32.97 | a | |||
1971 | 12.79 | b | 19.00 | b | 19.53 | a | 27.30 | 32.10 | 41.79 | b | 54.00 | b | 53.21 | c | 44.14 | b | 35.04 | c | 23.42 | f | 21.94 | 32.80 | a | |||
1972 | 16.07 | a | 16.86 | 26.23 | 27.81 | d | 34.47 | a | 46.37 | 53.27 | a | 52.35 | 46.10 | 41.90 | 22.34 | a | 19.07 | a | 33.57 | |||||||
1973 | 18.23 | 25.14 | 25.68 | 28.04 | b | 37.81 | 43.67 | 52.60 | a | 49.93 | a | 40.83 | 28.37 | a | 20.57 | 13.29 | 32.01 | |||||||||
1974 | 20.67 | a | 12.48 | a | 27.58 | 27.77 | 36.23 | 45.25 | b | 53.29 | 50.61 | 44.80 | 40.17 | a | 22.57 | 15.90 | a | 33.11 | ||||||||
1975 | 16.19 | 20.64 | 25.26 | 26.97 | 33.37 | a | 40.31 | a | 53.94 | 51.14 | c | 46.77 | 31.27 | a | 19.20 | 18.58 | 31.97 | |||||||||
1976 | 14.26 | 23.76 | 23.26 | 29.50 | 36.60 | a | 41.64 | b | 53.20 | a | 51.17 | a | 44.80 | 32.29 | 22.21 | a | 14.07 | b | 32.23 | |||||||
1977 | 19.57 | a | 19.75 | 20.57 | a | 30.00 | b | 34.00 | e | 45.07 | b | 56.03 | a | 54.47 | a | 47.90 | a | 35.14 | b | 22.32 | b | 20.03 | 33.74 | |||
1978 | 22.69 | b | 23.21 | 28.39 | 30.10 | a | 36.37 | a | 43.32 | e | 53.10 | 50.62 | b | 44.83 | a | 34.97 | a | 30.87 | 20.40 | a | 34.90 | |||||
1979 | 21.50 | a | 21.21 | 24.97 | a | 29.34 | a | 39.83 | a | 44.86 | a | 53.34 | b | 49.48 | 45.37 | ----- | z | 19.53 | 17.30 | a | 33.34 | a | ||||
1980 | 23.74 | 25.04 | c | 25.53 | a | 30.30 | 36.16 | 43.47 | 54.39 | 52.71 | 45.66 | a | 29.53 | a | 19.70 | 17.47 | a | 33.64 | ||||||||
1981 | 23.26 | 18.22 | a | 26.32 | 33.30 | 39.53 | a | 46.63 | 56.23 | 53.10 | 45.59 | c | 37.23 | 22.04 | b | 18.87 | 35.03 | |||||||||
1982 | 21.03 | 24.25 | 26.65 | 30.53 | 36.13 | a | 37.97 | 52.42 | 54.20 | a | 47.10 | 27.35 | 27.36 | b | 21.03 | 33.84 | ||||||||||
1983 | 20.39 | 23.86 | 27.48 | b | 28.69 | a | 35.29 | 41.93 | a | 53.26 | 56.20 | a | 52.30 | 40.07 | a | 28.31 | a | 23.73 | a | 35.96 | ||||||
1984 | 20.52 | 15.90 | 24.50 | a | 29.33 | 39.55 | 48.60 | 54.19 | 55.61 | 46.47 | 37.77 | 23.77 | 25.97 | 35.18 | ||||||||||||
1985 | 24.13 | 21.86 | 29.23 | a | 33.43 | 40.37 | a | 46.50 | 53.52 | 52.65 | 44.70 | 37.55 | 27.63 | 17.47 | a | 35.75 | ||||||||||
1986 | 18.42 | 25.00 | 28.13 | 32.60 | 37.40 | a | 48.93 | 54.23 | 55.37 | a | 42.90 | 34.26 | 27.97 | 21.40 | a | 35.55 | ||||||||||
1987 | 15.63 | a | 22.48 | a | 23.77 | 32.07 | 37.97 | 46.70 | 49.68 | 53.13 | 43.40 | 36.26 | 22.10 | a | 17.16 | 33.36 | ||||||||||
1988 | 18.16 | 23.03 | 21.58 | 30.24 | a | 36.55 | 45.76 | a | 54.52 | 57.39 | 43.17 | a | 39.42 | 24.00 | 20.16 | 34.50 | ||||||||||
1989 | 18.48 | 24.96 | 26.55 | 31.93 | 37.94 | 42.40 | 53.35 | 52.45 | 44.07 | 32.90 | a | 21.57 | 13.68 | 33.36 | ||||||||||||
1990 | 15.32 | 19.07 | 27.71 | 33.97 | 36.90 | 46.30 | 55.42 | 50.77 | 50.43 | 32.06 | 26.37 | 17.71 | 34.34 | |||||||||||||
1991 | 20.90 | 21.93 | 24.65 | 27.45 | a | 34.06 | 42.10 | 53.77 | 55.29 | 47.17 | 31.90 | 24.50 | 24.74 | 34.04 | ||||||||||||
1992 | 19.00 | 25.38 | 27.87 | 32.40 | 43.29 | 43.07 | 50.94 | 51.81 | 42.30 | 33.13 | 18.60 | 22.74 | 34.21 | |||||||||||||
1993 | 28.58 | 25.19 | a | 26.32 | 29.31 | a | 38.87 | 43.21 | b | 52.42 | 56.10 | 42.70 | 34.06 | 22.97 | 16.68 | 34.70 | ||||||||||
1994 | 14.90 | 20.68 | 28.16 | 31.13 | 37.16 | 47.31 | a | 51.61 | 55.03 | 46.30 | 31.80 | a | 27.27 | 24.39 | 34.65 | |||||||||||
1995 | 22.06 | 27.21 | 29.00 | b | 28.70 | 36.45 | 42.47 | 48.87 | 53.19 | 45.23 | 29.74 | 25.70 | 19.68 | 34.03 | ||||||||||||
1996 | 15.81 | 27.62 | 23.58 | 30.10 | 36.29 | 47.77 | 55.71 | 53.62 | b | 45.80 | 35.35 | 24.57 | 17.23 | 34.45 | ||||||||||||
1997 | 20.58 | 20.61 | 24.65 | 30.67 | 39.48 | 42.07 | 51.84 | 53.84 | 51.27 | 33.65 | 25.07 | 18.73 | a | 34.37 | ||||||||||||
1998 | 19.55 | 22.79 | 25.65 | 26.97 | a | 34.73 | a | 41.17 | 55.71 | 53.48 | 46.43 | 36.32 | 26.17 | 20.94 | 34.16 | |||||||||||
1999 | 16.93 | a | 17.82 | 23.77 | 29.40 | 35.48 | 43.33 | 56.81 | 53.42 | 48.47 | 30.30 | a | 20.90 | 14.29 | 32.58 | |||||||||||
2000 | 16.58 | 20.86 | 25.03 | 30.80 | 38.16 | 49.43 | 54.74 | 51.61 | 42.80 | 38.94 | 22.21 | a | 17.58 | 34.06 | ||||||||||||
2001 | 18.32 | 21.18 | 25.23 | 32.27 | 38.52 | 44.90 | a | 55.23 | 53.32 | 43.60 | 33.16 | 27.53 | 13.84 | 33.92 | ||||||||||||
2002 | 16.58 | 18.18 | 20.58 | 32.30 | 33.77 | 44.73 | 54.19 | 49.87 | 46.93 | 33.87 | 23.33 | 20.42 | 32.90 | |||||||||||||
2003 | 19.77 | 22.81 | a | 24.87 | 28.40 | 38.68 | 43.30 | 52.87 | 54.19 | 45.20 | 36.84 | 24.93 | 14.55 | 33.87 | ||||||||||||
2004 | 19.81 | 17.10 | 29.43 | a | 32.03 | 35.94 | 41.03 | 50.52 | 49.71 | 41.77 | 34.55 | 26.37 | 17.94 | 33.02 | ||||||||||||
2005 | 24.32 | 29.96 | a | 26.52 | 29.53 | 38.06 | 42.10 | 49.47 | a | 53.19 | 46.87 | 37.23 | a | 21.20 | 15.45 | 34.49 | ||||||||||
2006 | 14.39 | 19.54 | 25.61 | 30.73 | 37.10 | 46.57 | 55.20 | a | 55.71 | 45.07 | 35.16 | 21.97 | 15.77 | 33.57 | ||||||||||||
2007 | 20.30 | a | 21.11 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 20.70 | j | |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | 31.68 | b | 34.39 | 44.48 | a | 55.39 | m | 54.39 | 46.50 | h | 33.53 | a | 17.57 | b | 18.61 | 33.52 | e | |||
2011 | 11.97 | 15.86 | 23.50 | a | 32.80 | 32.97 | b | 42.93 | 55.80 | a | 57.06 | 46.70 | 32.13 | a | 24.20 | 17.42 | 32.78 | |||||||||
2012 | 19.00 | 20.64 | a | 21.77 | 30.43 | 36.63 | a | 44.40 | 56.13 | 53.71 | 44.73 | 29.16 | 21.93 | 17.23 | 32.98 | |||||||||||
2013 | 12.65 | 15.46 | 25.13 | 31.27 | 35.94 | 45.93 | 57.06 | 55.00 | 48.70 | 29.35 | 25.87 | 19.45 | 33.48 | |||||||||||||
2014 | 14.52 | 23.07 | 26.10 | 31.03 | 37.00 | 44.60 | 56.23 | 54.13 | 52.93 | 36.26 | 22.00 | a | 22.33 | a | 35.02 | |||||||||||
2015 | 22.35 | 24.43 | 29.06 | 30.47 | 36.48 | 49.80 | 56.26 | 54.00 | 49.10 | 39.94 | 24.53 | 17.45 | 36.16 | |||||||||||||
2016 | 18.62 | e | 17.48 | 25.06 | 31.17 | 35.58 | 47.93 | 53.03 | 52.45 | 46.60 | 34.90 | 27.80 | 23.06 | 34.47 | ||||||||||||
2017 | 23.00 | a | 24.29 | 27.03 | 30.13 | 35.23 | 46.30 | 54.77 | 53.13 | 43.87 | 32.65 | 27.77 | 17.35 | 34.63 | ||||||||||||
2018 | 15.42 | 24.04 | 26.77 | 32.50 | 36.13 | 46.53 | 54.90 | 53.14 | b | 45.77 | 38.19 | 19.97 | 20.00 | 34.45 | ||||||||||||
2019 | 20.00 | 21.67 | a | 29.03 | 31.60 | 34.84 | 43.10 | 54.13 | 54.19 | 47.17 | 30.35 | 26.40 | 20.81 | 34.44 | ||||||||||||
2020 | 19.00 | 22.52 | 29.87 | 30.60 | 37.10 | 45.27 | 54.68 | 52.94 | 41.77 | 28.63 | a | 24.67 | 13.29 | 33.36 | ||||||||||||
2021 | 16.13 | 19.00 | 23.19 | 31.83 | 35.29 | 47.90 | 56.03 | 54.35 | 47.53 | 32.58 | 22.93 | a | 22.81 | 34.13 | ||||||||||||
2022 | 16.07 | a | 14.57 | 22.10 | 29.67 | 35.77 | 50.00 | 56.16 | 56.81 | 47.83 | 37.10 | 19.17 | 20.87 | 33.84 | ||||||||||||
2023 | 18.32 | 19.21 | 26.97 | 27.60 | 36.29 | 40.17 | 53.17 | a | 53.90 | 46.60 | 33.45 | 25.37 | 17.81 | 33.24 | ||||||||||||
2024 | 19.71 | 23.68 | a | 27.70 | a | 28.50 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.70 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 18.31 | 21.15 | 25.24 | 30.28 | 36.35 | 44.40 | 53.96 | 53.34 | 45.78 | 34.04 | 23.84 | 18.73 | 33.89 | |||||||||||||
S.D. | 3.63 | 3.65 | 2.62 | 1.72 | 2.08 | 2.72 | 1.82 | 1.88 | 2.84 | 3.29 | 2.77 | 3.14 | 0.96 | |||||||||||||
SKEW | 0.11 | -0.28 | -0.45 | -0.04 | 0.49 | 0.02 | -0.72 | -0.16 | 0.11 | 0.16 | -0.02 | 0.16 | 0.18 | |||||||||||||
MAX | 28.58 | 29.96 | 29.87 | 33.97 | 43.29 | 50.00 | 57.06 | 57.39 | 52.93 | 41.90 | 30.87 | 25.97 | 36.16 | |||||||||||||
MIN | 9.68 | 11.55 | 18.97 | 26.97 | 31.81 | 37.97 | 48.87 | 49.32 | 39.54 | 27.35 | 17.57 | 13.29 | 31.97 | |||||||||||||
YRS | 64 | 64 | 63 | 61 | 62 | 63 | 62 | 62 | 63 | 63 | 63 | 63 | 55 |