YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | 22.68 | 20.66 | 24.45 | 28.73 | 35.39 | 46.37 | 48.13 | 45.00 | 40.90 | 34.19 | 24.40 | 13.40 | a | 32.02 | ||||||||||||
1949 | 1.94 | 18.29 | 29.65 | 32.67 | 41.26 | 44.93 | 49.06 | 46.39 | 42.70 | 30.29 | 29.40 | 16.77 | 31.95 | |||||||||||||
1950 | 14.03 | a | 24.46 | 26.97 | 30.27 | 37.13 | 44.77 | 51.84 | 50.45 | 43.07 | 35.97 | 31.57 | 30.35 | 35.07 | ||||||||||||
1951 | 21.77 | 26.36 | 23.65 | 35.67 | 38.77 | 47.03 | 50.03 | 48.45 | 44.60 | 32.77 | 27.97 | 15.68 | 34.40 | |||||||||||||
1952 | 17.26 | 20.97 | 25.03 | 32.90 | 39.23 | 42.17 | 52.77 | 47.19 | 46.43 | 36.87 | 22.33 | 17.16 | 33.36 | |||||||||||||
1953 | 27.45 | 25.29 | 26.39 | 30.10 | 33.77 | 39.27 | 49.45 | 47.10 | 44.33 | 31.71 | 32.63 | 24.48 | 34.33 | |||||||||||||
1954 | 23.10 | 26.54 | 25.52 | 32.03 | 38.52 | 39.40 | 48.48 | 44.13 | 37.50 | 30.29 | 28.37 | 21.65 | 32.96 | |||||||||||||
1955 | 14.81 | 20.36 | 25.45 | 27.47 | 35.19 | 44.73 | 45.68 | 48.23 | 41.50 | 34.23 | 24.53 | 24.77 | 32.25 | |||||||||||||
1956 | 23.52 | 17.38 | 25.71 | 33.10 | 40.26 | 41.90 | 52.81 | 45.77 | 41.07 | 32.00 | 25.23 | 20.06 | 33.23 | |||||||||||||
1957 | 13.03 | 24.29 | 31.19 | 32.40 | 39.39 | 45.33 | 47.84 | 44.19 | 45.23 | 35.52 | 25.40 | 24.94 | 34.06 | |||||||||||||
1958 | 25.32 | 32.64 | 26.32 | 30.63 | 41.45 | 47.13 | 53.13 | 52.87 | 42.27 | 35.97 | 28.37 | 27.16 | 36.94 | |||||||||||||
1959 | 26.03 | 24.74 | a | 25.84 | 33.03 | 35.39 | 45.90 | 54.23 | 49.10 | 43.03 | 36.45 | 22.40 | 17.16 | 34.44 | ||||||||||||
1960 | 22.23 | 25.10 | 31.29 | 31.80 | 34.94 | 45.67 | 52.42 | 44.68 | 42.97 | 32.84 | 27.97 | 24.77 | 34.72 | |||||||||||||
1961 | 23.87 | 27.96 | 29.06 | 30.43 | 35.84 | 46.07 | 48.26 | 50.03 | 38.73 | 33.61 | 22.73 | 22.19 | 34.07 | |||||||||||||
1962 | 8.90 | 23.14 | 28.23 | 31.43 | 35.45 | 43.83 | 47.42 | 46.32 | 44.13 | 34.65 | 28.87 | 25.42 | 33.15 | |||||||||||||
1963 | 14.29 | 30.61 | 26.74 | 28.30 | 40.71 | 43.00 | 46.81 | 48.00 | 45.97 | 34.74 | 29.00 | 23.13 | 34.27 | |||||||||||||
1964 | 18.47 | a | 15.83 | 25.42 | 27.60 | 34.71 | 43.67 | 50.00 | 44.94 | 36.53 | 35.10 | 26.53 | 27.84 | 32.22 | ||||||||||||
1965 | 24.23 | 25.54 | 26.84 | 34.97 | 34.94 | 45.30 | 49.13 | 48.61 | 37.50 | 33.00 | 29.83 | 18.16 | 34.00 | |||||||||||||
1966 | 23.55 | 23.89 | 28.26 | 30.07 | 38.97 | 41.73 | 44.16 | 48.29 | 43.83 | 32.39 | 30.80 | 26.19 | 34.34 | |||||||||||||
1967 | 23.87 | 26.46 | 25.94 | 27.00 | 36.26 | 44.83 | 51.06 | 51.68 | 44.73 | 31.65 | 26.97 | 11.87 | 33.53 | |||||||||||||
1968 | 18.61 | 31.66 | 27.32 | 26.80 | 37.13 | 44.03 | 51.97 | 48.52 | 40.53 | 33.52 | 27.37 | 18.23 | 33.81 | |||||||||||||
1969 | 19.65 | 24.64 | 27.10 | 30.33 | 43.61 | 48.50 | 50.65 | 46.45 | 42.23 | 31.84 | 24.50 | 26.58 | 34.67 | |||||||||||||
1970 | 27.35 | 29.04 | 29.58 | 26.93 | 37.65 | 47.37 | 51.23 | ----- | z | ----- | z | ----- | z | 34.60 | 21.84 | 33.95 | c | |||||||||
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | 32.13 | 32.43 | 34.65 | 43.63 | 49.58 | 47.39 | 36.73 | 32.19 | 20.13 | 13.52 | 34.24 | b | ||||||||||
1979 | 17.00 | 25.82 | 29.29 | 29.77 | 39.03 | 42.60 | 48.16 | 46.94 | 41.87 | 38.00 | 23.00 | 24.16 | 33.80 | |||||||||||||
1980 | 22.84 | 30.52 | 25.65 | 32.13 | 36.16 | 40.77 | 49.52 | 44.65 | 40.33 | 32.45 | 26.37 | 22.45 | 33.65 | |||||||||||||
1981 | 27.81 | 25.54 | 27.39 | 31.90 | 37.10 | 44.07 | 48.19 | 48.58 | 40.37 | 31.13 | 30.27 | 28.77 | 35.09 | |||||||||||||
1982 | 12.90 | 23.00 | 26.45 | 26.77 | 35.94 | 45.03 | 47.81 | 46.39 | 38.57 | 31.35 | 23.73 | 21.00 | 31.58 | |||||||||||||
1983 | 24.84 | 30.00 | 32.23 | 30.03 | 38.58 | 42.03 | 44.68 | 48.35 | 39.93 | 32.35 | 28.77 | 21.55 | 34.45 | |||||||||||||
1984 | 20.42 | 25.31 | 29.00 | 30.17 | 36.94 | 42.87 | 52.52 | 48.00 | 40.03 | ----- | z | 27.03 | 13.87 | 33.29 | a | |||||||||||
1985 | 15.13 | 19.50 | 23.29 | 32.97 | 35.87 | 47.03 | 52.77 | 45.65 | 38.73 | 29.42 | 15.97 | 19.35 | 31.31 | |||||||||||||
1986 | 29.71 | 31.11 | 31.74 | 30.70 | 37.13 | 49.63 | 46.39 | 51.10 | 37.90 | 32.32 | 26.17 | 22.68 | 35.55 | |||||||||||||
1987 | 20.26 | 25.57 | 26.97 | 31.33 | 38.87 | a | 47.20 | 46.03 | a | 48.58 | 40.20 | 33.65 | 25.00 | a | 20.19 | 33.65 | ||||||||||
1988 | 13.62 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 13.62 | k |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.32 | 26.80 | 27.10 | 28.07 | i | |||
1997 | 23.03 | 24.79 | 25.97 | 28.30 | 39.29 | 42.37 | 47.10 | 47.71 | 40.77 | 29.65 | 31.28 | e | 20.48 | 33.39 | ||||||||||||
1998 | 28.48 | 28.36 | 27.61 | 29.57 | 35.58 | 41.07 | 51.00 | 48.61 | 43.23 | 30.23 | 28.30 | 14.87 | 33.91 | |||||||||||||
1999 | 20.58 | 20.71 | 26.03 | 28.63 | 33.71 | 39.37 | 44.77 | 47.23 | 40.20 | 31.19 | 31.43 | 20.42 | 32.02 | |||||||||||||
2000 | 24.67 | a | 28.76 | 24.94 | 31.60 | 36.81 | 44.30 | 47.06 | 46.45 | 39.07 | 31.19 | 21.23 | 21.87 | 33.16 | ||||||||||||
2001 | 19.74 | 22.79 | 26.65 | 26.70 | 35.81 | 37.07 | 43.65 | 46.13 | 37.77 | 29.52 | 24.97 | 22.58 | 31.11 | |||||||||||||
2002 | 19.74 | 24.82 | 22.55 | 30.37 | 35.13 | 42.53 | 48.61 | 43.52 | 39.20 | 27.45 | 24.70 | 25.71 | 32.03 | |||||||||||||
2003 | 29.90 | 22.68 | 27.00 | 29.20 | 36.16 | 43.70 | 51.16 | 48.13 | 41.63 | 33.84 | 25.40 | 25.84 | 34.55 | |||||||||||||
2004 | 22.68 | 26.72 | 27.81 | 30.33 | 36.45 | 43.37 | 49.74 | 48.71 | 37.70 | 32.52 | 23.00 | 23.42 | 33.54 | |||||||||||||
2005 | 19.35 | 24.43 | 26.07 | a | 28.67 | 39.45 | 39.53 | 50.06 | 47.87 | 37.17 | 30.26 | 25.70 | 23.42 | 32.67 | ||||||||||||
2006 | 23.23 | 23.54 | 24.81 | 31.97 | 38.45 | 46.57 | 52.16 | 45.65 | 38.90 | 30.00 | 27.70 | 22.55 | 33.79 | |||||||||||||
2007 | 16.65 | 23.57 | 27.77 | 28.87 | 36.23 | 41.60 | 51.35 | 46.52 | 38.17 | 31.23 | 25.17 | 17.13 | 32.02 | |||||||||||||
2008 | 16.13 | 16.48 | 23.45 | 25.37 | 36.90 | 40.17 | 49.42 | 48.23 | 40.40 | 31.71 | 28.43 | 16.42 | 31.09 | |||||||||||||
2009 | 22.48 | 25.82 | 25.58 | 28.10 | 38.97 | 44.63 | 50.16 | 46.53 | a | 40.97 | 31.35 | 23.90 | 16.00 | 32.88 | ||||||||||||
2010 | 30.58 | 27.86 | 24.84 | 27.80 | 32.68 | 42.17 | 48.29 | 45.23 | 37.87 | 35.19 | 22.90 | 26.58 | 33.50 | |||||||||||||
2011 | 20.42 | 19.82 | 29.45 | 27.93 | 32.16 | 38.83 | 46.71 | 46.35 | 41.07 | 31.29 | 24.67 | 14.61 | 31.11 | |||||||||||||
2012 | 20.77 | 23.25 | a | 26.39 | 31.77 | 34.87 | 39.30 | 46.26 | 46.52 | 39.80 | 32.03 | 28.50 | 19.45 | 32.41 | ||||||||||||
2013 | 11.03 | 21.00 | 26.26 | 29.33 | 36.16 | 43.30 | 50.90 | 45.45 | 40.83 | 25.65 | 23.17 | 9.39 | 30.21 | |||||||||||||
2014 | 20.84 | 27.04 | 28.81 | 28.60 | 36.61 | 41.13 | 52.39 | 48.90 | 43.00 | 35.71 | 28.23 | 31.81 | e | 35.26 | ||||||||||||
2015 | 24.94 | 28.25 | 28.45 | 26.40 | 37.19 | 47.33 | 51.16 | 46.81 | 37.80 | 35.48 | 22.67 | 21.71 | 34.02 | |||||||||||||
2016 | 22.81 | 26.55 | 30.68 | 32.73 | 38.03 | 43.53 | 46.19 | 45.87 | 36.50 | 34.35 | 30.20 | 19.52 | 33.91 | |||||||||||||
2017 | 14.97 | 28.32 | 30.71 | 30.13 | 36.42 | 44.23 | 49.45 | 50.26 | 42.20 | 28.65 | 29.23 | 18.65 | 33.60 | |||||||||||||
2018 | 27.29 | 18.46 | 24.77 | 31.47 | 39.58 | 40.90 | 48.65 | 45.64 | c | 34.90 | 29.26 | 21.83 | 22.68 | 32.12 | ||||||||||||
2019 | 24.71 | 20.11 | 26.19 | 34.30 | 36.94 | 40.93 | 46.06 | 47.32 | 38.83 | 25.58 | 20.73 | 27.13 | 32.40 | |||||||||||||
2020 | 24.32 | 19.72 | 24.68 | 29.40 | 37.68 | 41.83 | 45.48 | 47.90 | 40.77 | 28.84 | 23.77 | 20.39 | 32.07 | |||||||||||||
2021 | 24.77 | a | 22.96 | a | 21.26 | 26.53 | 34.65 | 45.70 | 50.19 | 45.19 | 37.50 | 31.61 | 26.03 | 20.26 | 32.22 | |||||||||||
2022 | 21.00 | 17.04 | 24.87 | 26.28 | a | 31.37 | a | 40.00 | 49.65 | 49.32 | 41.33 | 29.97 | 19.67 | 18.35 | 30.74 | |||||||||||
2023 | 21.29 | 19.68 | 22.29 | 28.13 | 39.84 | 43.20 | 49.00 | 49.45 | 38.17 | 31.61 | 25.20 | 27.58 | 32.95 | |||||||||||||
2024 | 28.39 | 27.52 | 26.81 | 28.00 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.57 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.07 | 24.39 | 26.86 | 30.02 | 36.99 | 43.44 | 49.15 | 47.35 | 40.51 | 32.17 | 26.11 | 21.37 | 33.26 | |||||||||||||
S.D. | 5.49 | 3.98 | 2.43 | 2.35 | 2.33 | 2.69 | 2.50 | 1.93 | 2.62 | 2.59 | 3.49 | 4.74 | 1.33 | |||||||||||||
SKEW | -0.84 | -0.16 | 0.29 | 0.15 | 0.20 | -0.04 | -0.18 | 0.43 | 0.23 | -0.16 | -0.16 | -0.20 | -0.01 | |||||||||||||
MAX | 30.58 | 32.64 | 32.23 | 35.67 | 43.61 | 49.63 | 54.23 | 52.87 | 46.43 | 38.00 | 34.60 | 31.81 | 36.94 | |||||||||||||
MIN | 1.94 | 15.83 | 21.26 | 25.37 | 31.37 | 37.07 | 43.65 | 43.52 | 34.90 | 25.58 | 15.97 | 9.39 | 30.21 | |||||||||||||
YRS | 61 | 60 | 61 | 60 | 60 | 60 | 60 | 59 | 59 | 59 | 61 | 61 | 57 |