YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 23.59 | a | 35.26 | b | 39.03 | 53.77 | 67.10 | d | 68.85 | 70.74 | 58.52 | 48.79 | 31.33 | 14.39 | 46.49 | a | ||||||||
1962 | 7.39 | 12.78 | a | 26.47 | 40.43 | a | 60.72 | a | 65.13 | 66.87 | 67.56 | 56.75 | 50.61 | 35.22 | 18.94 | 42.41 | ||||||||||
1963 | 2.48 | 14.14 | n | 33.94 | 47.02 | a | 53.83 | a | 69.43 | 72.18 | 67.52 | 61.92 | 57.66 | i | 35.93 | g | 7.58 | 46.21 | c | |||||||
1964 | 18.05 | 20.91 | 23.22 | a | 45.37 | 59.94 | 66.57 | b | 74.13 | 66.05 | 58.10 | 47.37 | a | 32.24 | a | 9.28 | a | 43.44 | ||||||||
1965 | 5.68 | 9.18 | c | 15.73 | 41.12 | 57.84 | 65.11 | b | 69.02 | 66.94 | 50.77 | b | 49.48 | 30.98 | 23.83 | a | 40.47 | |||||||||
1966 | 0.42 | 12.79 | b | 33.80 | c | 39.59 | c | 52.40 | 67.07 | a | 74.00 | 66.02 | 59.00 | 46.25 | a | 27.93 | 16.04 | c | 41.28 | |||||||
1967 | 12.89 | 6.84 | 27.76 | 42.93 | 51.08 | 64.43 | a | 68.10 | 66.05 | 59.27 | 45.90 | 29.63 | 19.29 | b | 41.18 | |||||||||||
1968 | 11.15 | a | 11.64 | 37.22 | a | 47.78 | a | 53.82 | 65.32 | 69.73 | a | 68.34 | 59.37 | 50.47 | 32.50 | a | 14.61 | 43.49 | ||||||||
1969 | 6.82 | a | 17.32 | 22.23 | 46.95 | 58.35 | 59.35 | 69.71 | 70.97 | 59.63 | 46.48 | j | 31.10 | a | 18.21 | 41.88 | a | |||||||||
1970 | 3.65 | 14.64 | 22.50 | 42.75 | 55.97 | 68.75 | 72.73 | 68.53 | a | 59.40 | 47.63 | 29.52 | 15.44 | 41.79 | ||||||||||||
1971 | 3.55 | 16.24 | a | 26.03 | 46.00 | 54.32 | 69.57 | 66.15 | 66.60 | 59.57 | 50.55 | 30.38 | a | 15.82 | 42.06 | |||||||||||
1972 | 3.39 | 8.10 | 24.47 | b | 40.55 | 60.27 | 64.45 | 67.74 | 68.00 | 56.70 | 43.53 | 30.75 | 8.84 | 39.73 | ||||||||||||
1973 | 13.83 | a | 18.89 | 38.10 | 43.70 | 54.31 | 67.53 | 70.17 | a | 71.19 | 57.63 | 52.82 | 32.67 | a | 16.60 | a | 44.79 | |||||||||
1974 | 9.77 | 14.68 | 26.71 | 45.52 | b | 53.21 | 64.22 | 73.74 | 64.81 | 54.32 | 48.16 | 31.67 | a | 21.02 | 42.32 | |||||||||||
1975 | 11.28 | a | 13.61 | 20.34 | 37.52 | 59.95 | 66.27 | 74.15 | 68.81 | 56.43 | 50.35 | a | 33.90 | 15.29 | c | 42.32 | ||||||||||
1976 | 6.50 | 23.48 | 28.03 | 50.29 | b | 57.88 | a | 68.62 | 72.97 | 71.11 | 59.90 | 41.22 | d | 24.03 | 9.00 | 42.75 | ||||||||||
1977 | -1.17 | b | 17.31 | j | 34.56 | 50.94 | e | 65.69 | 66.88 | a | 72.44 | 64.65 | 58.83 | 47.05 | a | 33.50 | f | ----- | z | 51.10 | c | |||||
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.89 | h | 63.28 | 47.67 | b | 30.17 | c | 10.32 | 37.86 | h | ||
1979 | -1.92 | 7.48 | 26.37 | 40.08 | 52.74 | 64.77 | h | 69.42 | 66.13 | a | 60.50 | 45.27 | a | 29.90 | 23.27 | a | 38.11 | a | ||||||||
1980 | 11.78 | a | 12.88 | 23.74 | 47.09 | c | 59.42 | 63.63 | 69.44 | 68.92 | 58.12 | 43.39 | 33.75 | 17.08 | 42.44 | |||||||||||
1981 | 15.84 | b | 21.93 | 35.34 | 48.69 | d | 55.79 | 65.57 | 69.73 | 66.16 | 55.50 | 41.76 | 33.50 | 14.16 | 43.66 | |||||||||||
1982 | -0.87 | d | 12.92 | c | 25.38 | b | 41.21 | a | 60.70 | c | 61.00 | b | 71.98 | b | 67.82 | 57.05 | a | 47.26 | 26.90 | a | 21.52 | a | 41.07 | |||
1983 | 13.59 | c | 22.86 | c | 30.95 | 40.24 | a | 52.53 | b | 63.58 | 72.48 | 73.90 | a | 60.88 | 47.45 | 34.19 | f | 0.22 | b | 43.52 | a | |||||
1984 | 9.28 | a | 26.59 | a | 24.21 | b | 45.05 | b | 54.21 | 65.84 | b | 69.29 | 70.97 | b | 55.59 | c | 50.30 | a | 31.43 | 15.89 | 43.22 | |||||
1985 | 9.62 | c | 13.44 | b | 33.58 | e | 49.83 | a | 61.11 | 62.12 | 69.94 | 64.28 | a | 58.27 | 45.65 | 24.11 | c | 5.05 | b | 41.42 | ||||||
1986 | 15.82 | a | 13.62 | 31.43 | b | 49.37 | c | 58.53 | b | 67.31 | a | 71.62 | b | 65.02 | a | 58.62 | 47.57 | d | 25.31 | c | 20.73 | 43.75 | ||||
1987 | 19.23 | a | ----- | z | 35.67 | a | 52.67 | 61.37 | a | 69.98 | 74.87 | 67.48 | 59.80 | 40.67 | b | 34.39 | b | 23.18 | a | 49.03 | a | |||||
1988 | 7.44 | d | 11.90 | 33.85 | 47.27 | 65.96 | c | 72.79 | b | 76.74 | 71.30 | a | 59.52 | b | 43.41 | b | 30.57 | 19.16 | b | 44.99 | ||||||
1989 | 19.19 | 8.52 | b | 26.57 | a | 44.27 | d | 58.52 | b | 65.86 | b | 74.05 | a | 68.40 | 58.13 | 48.16 | 27.62 | b | 7.40 | a | 42.22 | |||||
1990 | 23.18 | 22.29 | b | 34.74 | 46.86 | a | 55.42 | 69.00 | 68.77 | a | 68.15 | a | 61.12 | 45.98 | 34.97 | 13.57 | b | 45.34 | ||||||||
1991 | 12.12 | b | 24.72 | a | 33.66 | 49.62 | a | 60.84 | 70.53 | 70.18 | 68.29 | 57.24 | a | 45.02 | 23.15 | 18.15 | 44.46 | |||||||||
1992 | 18.90 | a | 26.71 | 31.37 | 41.48 | 62.05 | a | 62.93 | 63.56 | 63.05 | 56.91 | c | 44.72 | d | 27.42 | 17.13 | a | 43.02 | ||||||||
1993 | 11.50 | b | 15.00 | a | 27.15 | a | 42.33 | a | 57.04 | d | 63.68 | 69.02 | c | 68.66 | b | 52.50 | c | 43.39 | c | 27.41 | a | 17.82 | c | 41.29 | ||
1994 | -0.14 | b | 10.42 | b | 32.35 | a | 43.29 | d | 60.00 | a | 67.68 | b | 68.44 | 65.78 | a | 60.93 | c | 51.03 | a | 35.60 | 22.54 | c | 43.16 | |||
1995 | 14.88 | a | 17.46 | b | 32.18 | a | 41.03 | a | 55.13 | a | 68.52 | 70.68 | a | 71.50 | b | 58.21 | b | 46.73 | a | 24.28 | a | 15.56 | 43.02 | |||
1996 | 5.38 | c | 16.33 | b | 22.89 | d | 38.81 | c | 54.10 | 65.83 | 67.24 | 68.05 | a | 59.17 | c | 47.63 | a | 23.69 | a | 11.21 | 40.03 | |||||
1997 | 8.18 | 18.19 | a | 28.18 | a | 42.35 | 52.45 | a | 68.43 | a | 69.13 | 66.53 | b | 61.28 | 49.78 | a | 27.33 | c | 26.93 | d | 43.23 | |||||
1998 | 16.83 | d | 31.15 | a | 31.06 | 48.90 | 63.58 | a | 63.42 | 69.24 | b | 69.68 | 64.30 | b | 49.90 | 35.62 | 22.55 | a | 47.19 | |||||||
1999 | 11.25 | c | 25.68 | 32.97 | 46.72 | a | 59.27 | a | 65.37 | c | 73.15 | 68.32 | c | 59.36 | a | 47.40 | 39.68 | 23.00 | f | 48.11 | a | |||||
2000 | 13.91 | b | 24.50 | 37.86 | c | 44.45 | a | 59.07 | a | 63.07 | a | 69.80 | c | 69.93 | c | 59.71 | f | 50.47 | b | 30.30 | 6.48 | c | 42.71 | a | ||
2001 | 19.98 | d | 9.76 | a | 27.08 | a | 46.50 | a | 58.60 | a | 66.35 | d | 71.31 | g | 73.05 | 59.52 | 47.17 | b | 43.30 | 25.40 | a | 43.34 | a | |||
2002 | 23.06 | d | 27.06 | c | 21.12 | a | 44.21 | a | 52.91 | c | 68.31 | a | 73.80 | c | 67.82 | a | 63.29 | b | 39.69 | b | 30.83 | 25.67 | e | 44.81 | ||
2003 | 13.53 | 13.41 | 30.27 | a | 45.72 | 55.63 | a | 64.20 | 69.11 | c | 70.53 | a | ----- | z | 49.98 | a | 29.93 | c | 23.76 | d | 42.37 | a | ||||
2004 | 8.40 | a | 21.37 | c | 34.53 | b | 48.29 | b | 53.60 | 62.07 | b | 68.08 | e | 63.63 | a | 65.25 | 48.61 | 35.88 | 21.80 | c | 44.29 | |||||
2005 | 9.35 | e | 23.87 | b | 30.56 | f | 49.89 | b | 55.88 | c | 69.92 | 72.56 | d | 68.70 | a | 64.34 | a | 49.78 | a | 35.43 | a | 19.10 | a | 47.16 | a | |
2006 | 26.76 | b | 16.72 | c | 33.08 | 51.43 | 59.37 | a | 66.80 | b | 74.88 | a | 69.24 | b | 57.02 | b | 44.47 | a | 34.73 | 26.61 | 46.76 | |||||
2007 | 18.15 | 11.62 | 35.43 | c | 44.98 | a | 61.47 | a | 67.35 | 72.22 | a | 68.63 | 62.08 | 51.97 | b | 32.55 | a | 13.35 | 44.98 | |||||||
2008 | 12.45 | 13.34 | 26.65 | 43.23 | q | 54.10 | 64.55 | a | 70.91 | c | 67.86 | c | 59.93 | b | 47.94 | 32.96 | b | 11.35 | a | 42.00 | a | |||||
2009 | 5.42 | 19.08 | b | 29.69 | 45.27 | 57.62 | a | 64.34 | a | 66.05 | a | 66.28 | a | 63.67 | 41.95 | 40.03 | 16.20 | a | 42.97 | |||||||
2010 | 11.19 | b | 16.64 | 39.19 | b | 51.87 | 59.14 | b | 66.42 | ----- | z | ----- | z | ----- | z | 49.84 | 32.81 | a | 11.84 | c | 37.66 | c | ||||
2011 | 8.67 | b | 15.48 | 24.35 | a | 43.90 | 56.05 | 64.87 | c | 73.90 | 68.82 | 58.62 | 51.63 | 36.10 | 25.81 | 44.02 | ||||||||||
2012 | 21.00 | a | 25.04 | a | 43.41 | b | 47.75 | 60.38 | a | 67.67 | 74.53 | a | 67.48 | b | 60.28 | 44.47 | 33.40 | 18.83 | a | 47.02 | ||||||
2013 | 14.62 | b | 14.80 | a | 23.76 | 37.20 | 55.84 | 64.87 | 70.03 | 69.56 | 63.18 | 46.57 | a | 29.80 | 8.70 | a | 41.58 | |||||||||
2014 | 4.27 | 4.85 | a | 22.87 | a | 40.12 | 56.47 | 66.25 | 67.77 | 68.60 | 59.77 | 47.13 | 22.69 | a | 22.48 | 40.27 | ||||||||||
2015 | 17.00 | 8.96 | 33.34 | 47.22 | 56.37 | 66.05 | 69.87 | 67.08 | 64.80 | 49.27 | 39.50 | 27.76 | 45.60 | |||||||||||||
2016 | 15.39 | 22.81 | 38.90 | 45.10 | 57.74 | 66.70 | 69.81 | 69.03 | 61.58 | 50.26 | 40.73 | 18.95 | 46.42 | |||||||||||||
2017 | 17.69 | 28.38 | 31.31 | 47.08 | 55.73 | 66.18 | 70.24 | 64.29 | 62.98 | 48.94 | 30.20 | 16.03 | 44.92 | |||||||||||||
2018 | 14.23 | 12.48 | 29.29 | 34.03 | 63.50 | 67.67 | 69.95 | 68.74 | 61.80 | 42.87 | 25.20 | 22.45 | 42.68 | |||||||||||||
2019 | 9.71 | 9.48 | 25.13 | 43.78 | 52.58 | 65.82 | 71.08 | 66.29 | 62.40 | 45.05 | 28.18 | 18.79 | 41.52 | |||||||||||||
2020 | 16.40 | 16.84 | 33.71 | 43.37 | 56.00 | 69.58 | 72.18 | 68.79 | 57.35 | 40.60 | 36.05 | 22.23 | 44.42 | |||||||||||||
2021 | 19.19 | 8.52 | 37.76 | 44.95 | 57.05 | 71.35 | 71.74 | 70.77 | 62.83 | 52.08 | 33.35 | 20.52 | 45.84 | |||||||||||||
2022 | 7.24 | 9.93 | 28.66 | 39.33 | 58.35 | 68.58 | 70.66 | 68.34 | 60.95 | 48.60 | 32.55 | 15.61 | 42.40 | |||||||||||||
2023 | 17.23 | 17.29 | 24.21 | 41.27 | 61.24 | 69.80 | 69.26 | 69.69 | 65.05 | 48.95 | 35.23 | 31.32 | 45.88 | |||||||||||||
2024 | 18.68 | 29.97 | 34.35 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.67 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.62 | 16.78 | 29.93 | 44.63 | 57.40 | 66.35 | 70.67 | 68.12 | 59.65 | 47.19 | 31.54 | 17.36 | 43.29 | |||||||||||||
S.D. | 6.56 | 6.49 | 5.60 | 4.03 | 3.45 | 2.58 | 2.56 | 2.24 | 2.96 | 3.16 | 4.53 | 6.24 | 1.89 | |||||||||||||
SKEW | -0.11 | 0.35 | -0.06 | -0.18 | 0.34 | -0.09 | -0.03 | 0.05 | -0.35 | -0.51 | 0.15 | -0.31 | 0.22 | |||||||||||||
MAX | 26.76 | 31.15 | 43.41 | 52.67 | 65.96 | 72.79 | 76.74 | 73.90 | 65.25 | 52.82 | 43.30 | 31.32 | 47.19 | |||||||||||||
MIN | -1.92 | 4.85 | 15.73 | 34.03 | 51.08 | 59.35 | 63.56 | 63.05 | 50.77 | 39.69 | 22.69 | 0.22 | 39.73 | |||||||||||||
YRS | 62 | 60 | 62 | 61 | 62 | 61 | 60 | 61 | 60 | 61 | 60 | 61 | 48 |