YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | 12.83 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 46.61 | 38.10 | 29.29 | 17.57 | b | ----- | z | 32.89 | h | |||
1967 | ----- | z | ----- | z | 22.23 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.23 | k |
1968 | 15.24 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.24 | f | 45.03 | ----- | z | ----- | z | 24.86 | b | 8.03 | a | 23.29 | h | |
1969 | -5.40 | a | 10.36 | 22.87 | 31.87 | 40.74 | 51.27 | 49.38 | b | 45.97 | 42.67 | 28.84 | 23.43 | b | 16.48 | h | 31.09 | a | ||||||||
1970 | 5.29 | 13.11 | 19.55 | b | 28.28 | a | 36.61 | 48.20 | 51.84 | 43.30 | a | 31.32 | b | 22.00 | b | 15.97 | a | 3.80 | a | 26.61 | ||||||
1971 | 7.87 | 10.11 | a | 11.27 | a | 22.62 | d | 33.47 | l | 36.15 | d | 45.00 | f | 46.06 | 30.37 | 24.04 | g | 17.57 | b | ----- | z | 22.75 | d | |||
1972 | 1.97 | a | 8.86 | 20.19 | 23.12 | e | 37.63 | a | 46.87 | 46.24 | b | 48.90 | 36.13 | 27.70 | a | 27.54 | d | 10.71 | 27.99 | |||||||
1973 | 6.94 | 14.30 | a | 26.68 | 31.38 | a | 38.68 | 45.03 | a | 52.32 | 51.35 | 41.57 | 30.63 | a | 17.92 | e | ----- | z | 32.44 | a | ||||||
1974 | 6.42 | 16.79 | 21.39 | 32.31 | a | 36.48 | b | 46.37 | 49.63 | a | 50.97 | a | 39.79 | a | 29.07 | a | 26.50 | f | 18.42 | 31.60 | a | |||||
1975 | 7.85 | e | 10.81 | b | 20.66 | b | 29.03 | 39.87 | 45.52 | a | 55.21 | b | 48.63 | a | 39.36 | b | 33.00 | 22.83 | 14.90 | b | 30.64 | |||||
1976 | 11.23 | 15.66 | 19.07 | a | 30.00 | 37.70 | a | 40.20 | 47.45 | 47.06 | 39.07 | 27.61 | 22.30 | 15.19 | 29.38 | |||||||||||
1977 | 6.35 | 21.57 | 28.52 | 33.13 | 38.23 | 49.53 | 50.26 | 54.35 | 41.27 | 28.90 | 22.57 | 11.55 | 32.19 | |||||||||||||
1978 | 16.26 | 21.96 | a | 24.74 | 33.13 | 38.35 | 46.03 | 51.87 | 50.13 | 43.97 | 29.68 | 19.20 | 7.26 | 31.88 | ||||||||||||
1979 | -2.65 | 12.89 | 24.00 | 29.65 | g | 40.90 | 47.87 | 53.39 | 52.55 | 43.20 | 34.74 | 18.53 | 23.74 | 31.74 | a | |||||||||||
1980 | 3.71 | 19.79 | 25.48 | 33.10 | 42.23 | 46.07 | 50.13 | 48.71 | 42.70 | 31.13 | 25.47 | 17.06 | 32.13 | |||||||||||||
1981 | 23.55 | 19.71 | 27.58 | 30.93 | 39.45 | 43.23 | 50.48 | 52.90 | 40.43 | 30.23 | 27.17 | 12.84 | 33.21 | |||||||||||||
1982 | 13.13 | 14.89 | 23.13 | 25.79 | a | 37.90 | 50.40 | 50.55 | 49.77 | 41.87 | 30.83 | a | 19.60 | 14.16 | 31.00 | |||||||||||
1983 | 22.27 | a | 23.54 | 28.77 | 31.20 | 41.20 | a | 47.20 | 47.68 | 52.32 | 38.53 | 31.84 | 29.20 | 1.06 | 32.90 | |||||||||||
1984 | 15.77 | 21.31 | 28.13 | a | 31.60 | 37.77 | 45.60 | 51.58 | 50.71 | 38.03 | 29.90 | 23.40 | 1.50 | a | 31.28 | |||||||||||
1985 | 10.84 | 8.75 | 22.16 | 30.67 | 41.55 | 46.83 | 54.00 | 51.13 | a | 39.10 | 32.61 | 10.50 | 6.97 | 29.59 | ||||||||||||
1986 | 19.10 | 16.11 | 23.61 | 26.97 | 40.48 | 50.57 | 49.94 | 54.26 | 41.27 | 30.94 | 26.37 | 15.42 | 32.92 | |||||||||||||
1987 | 14.23 | 23.61 | 27.81 | 33.48 | a | 39.94 | 47.97 | 52.00 | 49.35 | 44.43 | 32.68 | 28.93 | 14.32 | 34.06 | ||||||||||||
1988 | 10.90 | 17.66 | 27.55 | 33.90 | 39.43 | a | 46.10 | 51.97 | 50.48 | 42.20 | 36.19 | 26.93 | a | 15.52 | 33.24 | |||||||||||
1989 | 15.52 | 11.50 | 23.97 | 32.55 | a | 39.23 | 48.59 | a | 49.48 | 50.81 | 41.40 | 33.16 | 29.13 | 20.87 | 33.02 | |||||||||||
1990 | 19.77 | 13.67 | a | 26.39 | 34.97 | 40.19 | 46.93 | 53.35 | 53.06 | 45.33 | 32.19 | 28.40 | 8.94 | 33.60 | ||||||||||||
1991 | 12.39 | 26.57 | 24.81 | 31.90 | 40.26 | 44.83 | 50.47 | a | 53.35 | 44.67 | 30.68 | 26.17 | 20.50 | a | 33.88 | |||||||||||
1992 | 20.57 | a | 26.86 | 28.84 | 33.97 | 40.97 | 52.03 | 52.23 | 50.42 | 42.00 | 35.52 | 26.47 | 10.35 | 35.02 | ||||||||||||
1993 | 8.90 | 16.70 | a | 24.39 | 31.97 | 43.29 | 46.77 | 49.03 | 49.77 | 42.30 | 34.77 | 17.83 | 17.26 | 31.92 | ||||||||||||
1994 | 21.84 | 17.43 | 25.83 | a | 36.60 | 41.23 | 44.73 | 55.87 | 51.58 | 46.17 | a | 33.71 | 18.77 | 16.29 | 34.17 | |||||||||||
1995 | 15.00 | 21.93 | 24.26 | 31.00 | 41.10 | 46.70 | 53.58 | 46.32 | 45.57 | 32.45 | 26.57 | 18.50 | a | 33.58 | ||||||||||||
1996 | 12.39 | 14.55 | 24.13 | a | 31.40 | 36.74 | 44.20 | 51.30 | a | 50.23 | 42.10 | 32.53 | a | 23.43 | 10.45 | 31.12 | ||||||||||
1997 | 15.16 | 17.29 | 25.16 | 29.93 | 39.87 | 44.90 | 49.06 | 51.81 | 44.23 | 33.23 | 27.73 | 18.97 | 33.11 | |||||||||||||
1998 | 17.48 | 27.68 | 28.61 | 32.17 | 44.35 | 47.77 | 56.26 | 53.35 | 47.80 | 31.37 | a | 29.83 | 15.74 | 36.03 | ||||||||||||
1999 | 21.52 | 22.14 | 24.16 | 29.27 | 36.61 | 45.93 | 49.87 | 53.00 | 40.37 | 31.16 | 31.33 | 23.68 | 34.09 | |||||||||||||
2000 | 16.42 | 21.14 | 27.77 | 33.63 | 39.81 | 47.50 | 50.68 | 52.61 | 42.87 | 34.16 | 20.57 | 14.19 | 33.45 | |||||||||||||
2001 | 19.68 | 16.64 | 27.61 | 31.53 | 40.26 | 45.43 | 52.97 | 53.55 | 46.77 | 34.00 | 28.93 | 18.61 | 34.67 | |||||||||||||
2002 | 19.74 | 19.39 | 22.90 | 32.87 | 38.13 | 48.13 | 54.58 | 52.00 | 43.53 | 31.03 | 25.53 | 26.03 | 34.49 | |||||||||||||
2003 | 20.00 | 19.43 | 27.57 | a | 32.87 | 39.26 | 50.03 | 56.13 | 54.13 | 46.80 | 37.32 | 21.00 | 15.48 | 35.00 | ||||||||||||
2004 | 18.26 | 22.41 | 28.97 | 33.57 | 41.23 | 48.21 | a | 55.29 | 54.94 | 44.40 | 35.29 | 26.80 | 22.45 | 35.98 | ||||||||||||
2005 | 16.00 | 17.71 | 29.26 | 33.70 | 42.06 | 47.03 | 52.00 | 52.39 | 43.70 | 36.52 | 23.90 | a | 13.39 | 33.97 | ||||||||||||
2006 | 23.84 | 16.61 | 26.00 | a | 32.03 | 38.77 | 48.47 | 56.23 | a | 51.33 | a | 44.43 | b | 33.29 | 22.00 | b | 13.62 | b | 33.89 | |||||||
2007 | 6.07 | a | 22.74 | a | 27.29 | 33.36 | s | 38.94 | 50.60 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.76 | h | ||
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.62 | v | 9.77 | 9.77 | k | |
2009 | 8.34 | b | 14.41 | a | 19.38 | e | 31.30 | g | 36.72 | b | 47.37 | c | 53.17 | a | 54.71 | c | 44.07 | a | 29.52 | 26.33 | 9.97 | 31.27 | a | |||
2010 | 22.14 | b | 24.43 | 26.06 | 32.50 | 37.73 | a | 47.77 | 53.58 | 53.19 | 45.13 | 35.50 | a | 20.00 | 19.13 | 34.76 | ||||||||||
2011 | 16.23 | 15.29 | 25.74 | 29.03 | 39.61 | 47.00 | 50.48 | 54.35 | 46.50 | 34.03 | 22.43 | 12.65 | 32.78 | |||||||||||||
2012 | 12.06 | 19.52 | 23.61 | 32.33 | 40.13 | 46.30 | 56.30 | k | 55.06 | 45.33 | 34.13 | 28.20 | 18.06 | 32.25 | a | |||||||||||
2013 | 7.97 | 22.50 | 27.32 | 33.63 | 41.55 | 47.47 | 57.06 | 54.06 | 47.47 | 29.74 | 25.13 | 10.16 | 33.67 | |||||||||||||
2014 | 18.00 | 15.79 | 26.52 | 31.83 | 42.35 | 50.23 | 59.12 | f | 56.03 | 44.97 | 40.16 | 24.00 | 20.23 | 33.65 | a | |||||||||||
2015 | 18.39 | 25.71 | 29.61 | 31.63 | 43.06 | 55.30 | 58.81 | 55.48 | 42.00 | 38.00 | 22.10 | 16.61 | 36.39 | |||||||||||||
2016 | 17.97 | 21.66 | 28.19 | 37.33 | 44.77 | 49.47 | 54.74 | 53.61 | 44.07 | 35.06 | 33.23 | 10.58 | 35.89 | |||||||||||||
2017 | 8.16 | 14.70 | a | 25.94 | 31.90 | 41.42 | 48.67 | 57.23 | 55.42 | 44.63 | 30.10 | 27.47 | 15.42 | 33.42 | ||||||||||||
2018 | 21.45 | 17.18 | 26.55 | 33.17 | 47.48 | 48.33 | 55.84 | 55.13 | 43.23 | 31.77 | 26.17 | 18.26 | 35.38 | |||||||||||||
2019 | 16.48 | 6.43 | 18.32 | 33.63 | 44.48 | 49.67 | 52.52 | 54.87 | 46.60 | 30.68 | 22.30 | 16.68 | 32.72 | |||||||||||||
2020 | 19.87 | 19.48 | 24.81 | 32.80 | 41.35 | 48.23 | 54.61 | 55.13 | 47.23 | 34.58 | 22.50 | 16.71 | 34.78 | |||||||||||||
2021 | 16.84 | 18.61 | 24.61 | 32.30 | 40.61 | 52.03 | 61.10 | 56.16 | 44.00 | 32.35 | 27.37 | 10.97 | 34.75 | |||||||||||||
2022 | 12.52 | 18.11 | 28.19 | 30.03 | 39.77 | 47.60 | 57.26 | 57.00 | 45.93 | 36.61 | 12.30 | 3.61 | 32.41 | |||||||||||||
2023 | 19.35 | 17.32 | 23.10 | 30.43 | 47.23 | 52.60 | 56.58 | 56.26 | 46.80 | 33.74 | 24.37 | 22.94 | 35.89 | |||||||||||||
2024 | 15.06 | 24.00 | 26.68 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.91 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 13.97 | 17.99 | 24.96 | 31.59 | 40.30 | 47.42 | 52.75 | 51.85 | 42.74 | 32.38 | 23.82 | 14.41 | 33.17 | |||||||||||||
S.D. | 6.52 | 4.89 | 3.40 | 2.72 | 2.46 | 2.97 | 3.13 | 3.16 | 3.59 | 3.07 | 4.61 | 5.63 | 2.09 | |||||||||||||
SKEW | -0.79 | -0.17 | -1.40 | -1.27 | 0.83 | -0.74 | 0.31 | -0.69 | -1.36 | -0.31 | -0.63 | -0.35 | -1.03 | |||||||||||||
MAX | 23.84 | 27.68 | 29.61 | 37.33 | 47.48 | 55.30 | 61.10 | 57.00 | 47.80 | 40.16 | 33.23 | 26.03 | 36.39 | |||||||||||||
MIN | -5.40 | 6.43 | 11.27 | 22.62 | 36.48 | 36.15 | 46.24 | 43.30 | 30.37 | 22.00 | 10.50 | 1.06 | 26.61 | |||||||||||||
YRS | 56 | 55 | 56 | 51 | 53 | 53 | 50 | 55 | 54 | 53 | 54 | 52 | 45 |