YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.02 | h | 48.00 | f | 22.00 | a | 16.66 | b | 19.33 | j |
1952 | 10.76 | 21.13 | b | 24.00 | a | 44.09 | a | 53.85 | 66.52 | a | 71.45 | 65.14 | b | 59.56 | f | 39.86 | m | 32.83 | a | 21.05 | c | 41.08 | b | |||
1953 | 14.63 | a | 13.70 | 24.33 | h | 37.24 | a | 51.42 | 66.55 | a | 68.80 | d | 69.70 | c | ----- | z | ----- | z | 35.09 | b | 18.42 | 41.73 | c | |||
1954 | 6.95 | 24.69 | a | 22.79 | 42.05 | 47.32 | 65.77 | 67.48 | 63.63 | 55.42 | 43.71 | 33.98 | 20.68 | 41.21 | ||||||||||||
1955 | 9.00 | 10.46 | 19.89 | 48.85 | 58.00 | 64.18 | 73.65 | 70.30 | a | 57.30 | 47.18 | 23.40 | 9.53 | 40.98 | ||||||||||||
1956 | 12.40 | 10.79 | 22.53 | 37.40 | 52.31 | 65.73 | 63.66 | 64.55 | 54.52 | 52.37 | 30.53 | 18.02 | 40.40 | |||||||||||||
1957 | 3.44 | 12.81 | a | 23.72 | a | 47.36 | h | 52.48 | 62.83 | g | 69.87 | 65.77 | 54.78 | 44.11 | 30.73 | 19.02 | 37.67 | b | ||||||||
1958 | 17.05 | 10.00 | 27.50 | 44.12 | d | 53.27 | 56.97 | 64.53 | 63.75 | g | 58.48 | 46.98 | 31.68 | 7.58 | 38.02 | a | ||||||||||
1959 | 2.23 | 9.64 | 25.70 | c | 43.17 | x | 55.62 | a | 64.95 | 68.26 | 70.15 | 58.58 | 42.52 | 20.07 | a | 24.28 | a | 40.18 | a | |||||||
1960 | 11.68 | 14.38 | 16.55 | b | 41.69 | a | 52.13 | 60.33 | 67.15 | 68.65 | 58.53 | a | 45.97 | 32.67 | 13.40 | e | 40.26 | |||||||||
1961 | 9.08 | 20.86 | 32.03 | 37.25 | 50.77 | 63.45 | k | 67.56 | 69.79 | 58.25 | 48.15 | 30.18 | 15.35 | 39.93 | a | |||||||||||
1962 | 5.92 | 11.20 | 28.55 | 39.12 | 57.82 | 61.33 | 64.53 | 65.53 | 55.13 | 47.60 | 33.77 | 15.65 | 40.51 | |||||||||||||
1963 | 1.00 | b | 8.05 | 29.03 | 44.45 | 53.02 | 65.23 | 70.08 | 63.98 | 59.57 | 55.42 | 35.63 | 9.21 | 41.22 | ||||||||||||
1964 | 18.23 | 16.60 | 23.35 | 42.60 | 57.97 | 76.08 | x | 70.67 | a | 62.35 | 55.16 | b | 44.90 | 32.57 | a | 9.87 | 39.48 | a | ||||||||
1965 | 5.97 | 8.50 | a | 17.34 | 40.00 | 56.03 | 60.13 | 64.13 | 63.87 | 50.47 | 46.35 | 29.00 | 22.26 | 38.67 | ||||||||||||
1966 | -0.19 | 13.56 | a | 30.13 | 36.67 | 47.64 | c | 64.95 | 69.63 | 61.92 | 54.43 | a | 44.90 | 27.09 | a | 15.50 | b | 38.85 | ||||||||
1967 | 11.85 | a | 5.79 | 27.27 | 40.93 | 47.39 | ----- | z | 65.39 | d | 62.61 | 56.38 | 43.48 | 26.80 | 17.26 | 36.83 | a | |||||||||
1968 | 10.37 | a | 10.88 | 34.56 | 43.37 | 50.90 | 61.90 | 67.48 | 65.77 | 57.10 | 48.97 | 30.95 | 14.27 | 41.38 | ||||||||||||
1969 | 8.68 | 15.41 | 22.82 | 44.32 | 55.34 | c | 57.16 | a | 66.71 | 68.66 | b | 57.87 | 42.03 | a | 31.17 | a | 18.63 | 40.73 | ||||||||
1970 | 3.48 | a | 10.24 | a | 22.26 | 42.07 | 53.83 | a | 66.67 | 70.02 | a | 67.73 | 57.48 | a | 45.64 | b | 28.77 | b | 14.60 | 40.23 | ||||||
1971 | 2.97 | 14.39 | 23.61 | 42.77 | 50.13 | 66.17 | a | 64.45 | 63.13 | 58.80 | 51.13 | 30.62 | 15.35 | 40.29 | ||||||||||||
1972 | 1.67 | a | 7.24 | 22.27 | 36.90 | 58.13 | 62.10 | 66.21 | 65.00 | 54.67 | 41.66 | b | 30.42 | 9.00 | a | 37.94 | ||||||||||
1973 | 13.33 | b | 17.30 | a | 36.08 | 41.32 | 51.15 | e | 65.60 | 67.82 | 68.58 | 55.78 | 49.80 | a | 30.12 | 13.11 | 42.50 | |||||||||
1974 | 7.72 | a | 12.70 | 25.47 | a | 42.18 | 48.18 | i | 61.21 | a | 71.97 | 63.92 | 52.53 | a | 45.79 | 33.00 | 22.08 | 39.87 | a | |||||||
1975 | 11.66 | b | 16.80 | 21.08 | a | 35.80 | 56.83 | b | 62.80 | 69.54 | c | ----- | z | 51.61 | k | 47.60 | 32.28 | 12.94 | 36.73 | b | ||||||
1976 | 6.29 | 22.75 | a | 25.92 | a | 44.05 | a | 54.23 | 67.50 | i | 69.12 | n | ----- | z | ----- | z | ----- | z | 18.00 | m | 4.08 | a | 26.22 | f | ||
1977 | -3.95 | b | ----- | z | 34.09 | h | 48.08 | 63.20 | k | 65.65 | q | ----- | z | 60.32 | 55.07 | a | 43.94 | g | 27.90 | 14.26 | d | 33.61 | f | |||
1978 | 2.50 | 6.91 | 24.27 | 40.09 | c | 55.73 | 61.48 | a | 65.13 | 64.97 | 58.57 | 44.08 | 26.53 | 8.40 | b | 38.22 | ||||||||||
1979 | -4.68 | c | 5.00 | 24.58 | a | 37.42 | 47.82 | 59.63 | 66.63 | 62.56 | 56.33 | 41.56 | 28.98 | 21.50 | c | 37.28 | ||||||||||
1980 | 8.39 | 9.86 | 20.48 | 43.32 | 56.81 | 61.50 | a | 67.85 | 64.89 | 52.62 | 38.76 | 28.47 | 11.84 | b | 38.73 | |||||||||||
1981 | 9.90 | 17.68 | 29.21 | 42.48 | 51.77 | a | 61.18 | 67.02 | 65.65 | 53.80 | 40.44 | 33.30 | 14.85 | 40.61 | ||||||||||||
1982 | -2.80 | d | 8.88 | d | 23.13 | 37.37 | 56.21 | 57.17 | a | 67.76 | 62.35 | 53.93 | a | 44.82 | a | 26.16 | a | 20.08 | a | 37.92 | ||||||
1983 | 12.47 | a | 21.88 | 28.82 | a | 36.03 | 48.93 | b | 61.12 | 70.50 | b | 68.68 | 56.15 | 42.98 | 30.12 | a | 0.21 | c | 39.82 | |||||||
1984 | 6.15 | 22.35 | b | 18.85 | 43.17 | 49.80 | a | 63.38 | 66.47 | 67.77 | a | 51.40 | 45.85 | a | 27.65 | 12.52 | 39.61 | |||||||||
1985 | 5.68 | a | 6.96 | b | 29.20 | a | 42.95 | 55.69 | 56.95 | 64.63 | 59.50 | 52.73 | 40.15 | 19.78 | a | 1.66 | 36.32 | |||||||||
1986 | 8.82 | 8.69 | a | 26.33 | b | 43.02 | a | 53.31 | 60.68 | 66.17 | a | 59.53 | 54.97 | 42.98 | 24.79 | a | 18.08 | 38.95 | ||||||||
1987 | 14.66 | 24.28 | a | 33.26 | 47.32 | 56.93 | a | 65.38 | 69.77 | a | 63.65 | 55.97 | 36.85 | 31.78 | 20.10 | 43.33 | ||||||||||
1988 | 3.58 | 4.66 | 25.97 | a | 40.60 | a | 57.85 | 64.80 | 70.82 | 66.60 | 55.22 | 37.45 | 29.18 | 12.32 | 39.09 | |||||||||||
1989 | 12.08 | a | 0.88 | b | 21.30 | d | 37.77 | 52.27 | 60.30 | 69.19 | 65.02 | 55.27 | 43.07 | c | 23.67 | 1.66 | 36.87 | |||||||||
1990 | 16.90 | 12.80 | 27.31 | 41.02 | 48.44 | 61.78 | 64.29 | 63.58 | 54.32 | 41.55 | 30.88 | 15.26 | b | 39.84 | ||||||||||||
1991 | 4.57 | a | 17.30 | a | 27.87 | a | 43.37 | 56.87 | 64.57 | 64.72 | a | 65.85 | 52.79 | a | 39.90 | 19.28 | 14.23 | a | 39.28 | |||||||
1992 | 15.47 | b | 22.00 | b | 26.58 | a | 37.30 | 56.37 | 59.58 | 60.37 | 60.00 | a | 53.27 | b | 41.11 | 27.98 | 16.23 | 39.69 | ||||||||
1993 | 8.53 | 13.67 | a | 26.48 | 36.52 | 51.77 | 58.47 | 65.79 | 66.55 | a | 48.77 | 39.30 | a | 24.38 | 16.93 | a | 38.10 | |||||||||
1994 | -3.05 | 6.59 | 27.94 | 39.32 | 53.77 | a | 64.20 | 65.42 | 62.44 | 57.63 | c | 46.68 | 32.52 | 19.65 | 39.42 | |||||||||||
1995 | 11.63 | 11.37 | b | 28.61 | 34.70 | 51.98 | 66.62 | 67.32 | 68.08 | 53.63 | 43.84 | 20.12 | 11.55 | a | 39.12 | |||||||||||
1996 | 1.29 | 9.50 | a | 18.21 | 34.62 | 50.06 | 63.25 | 63.94 | 65.68 | a | 56.53 | 44.48 | 21.67 | 12.63 | 36.82 | |||||||||||
1997 | 6.44 | 15.46 | 25.43 | a | 38.83 | 47.34 | 65.60 | 66.58 | 60.56 | 57.40 | 46.08 | a | 25.92 | 23.47 | 39.93 | |||||||||||
1998 | 16.19 | 29.38 | 27.61 | 45.55 | 59.87 | 62.33 | 68.45 | 68.52 | 60.87 | ----- | z | 34.05 | 19.27 | 44.74 | a | |||||||||||
1999 | 7.03 | 22.41 | 29.87 | 43.40 | 57.37 | 63.55 | 70.90 | 65.37 | 56.78 | 43.42 | a | 36.36 | a | 20.29 | b | 43.06 | ||||||||||
2000 | 9.61 | c | 20.59 | a | 35.02 | 40.90 | 57.05 | a | 60.50 | a | 66.95 | a | 66.58 | a | 55.50 | a | 47.27 | c | 31.00 | 5.33 | b | 41.36 | ||||
2001 | 15.69 | 8.22 | c | 24.43 | a | 41.74 | a | 55.69 | 64.15 | 68.32 | 68.77 | 55.75 | 44.34 | 41.95 | 23.84 | 42.74 | ||||||||||
2002 | 18.82 | 23.36 | 19.66 | 40.42 | 49.39 | 65.37 | 72.37 | 66.56 | 60.08 | 38.69 | 27.90 | 21.68 | a | 42.03 | ||||||||||||
2003 | 9.11 | 9.45 | 24.79 | 40.45 | 53.60 | 62.32 | 66.00 | 66.63 | 58.83 | 44.98 | 28.95 | 20.76 | 40.49 | |||||||||||||
2004 | 7.84 | b | 16.50 | 30.29 | 42.07 | 50.93 | a | 59.82 | 64.67 | a | 59.61 | 61.57 | 46.90 | a | 34.57 | 16.23 | 40.92 | |||||||||
2005 | 7.00 | 21.48 | 25.08 | 47.13 | 51.71 | 66.53 | 68.63 | 67.37 | 60.32 | 47.37 | 32.53 | 17.44 | 42.72 | |||||||||||||
2006 | 23.87 | 12.57 | a | 30.31 | 48.23 | 55.94 | 63.70 | 71.16 | 65.00 | 54.07 | 39.66 | 32.70 | 24.18 | 43.45 | ||||||||||||
2007 | 15.16 | 8.50 | a | 31.52 | 41.15 | 58.40 | 67.08 | 69.66 | 67.10 | 58.53 | 49.95 | 30.94 | c | 12.13 | a | 42.51 | ||||||||||
2008 | 11.65 | a | 9.67 | 22.89 | 39.05 | 49.26 | 60.38 | 68.06 | 66.03 | a | 58.71 | a | 45.08 | 30.92 | e | 7.87 | 39.13 | |||||||||
2009 | -0.98 | 15.66 | 26.69 | 41.62 | 53.69 | 62.07 | 63.13 | 63.61 | 62.48 | 40.10 | 37.93 | 13.19 | 39.93 | |||||||||||||
2010 | 8.95 | 14.68 | 36.23 | 48.52 | 56.63 | 63.13 | 70.90 | 70.10 | 53.83 | 46.73 | 30.92 | 13.27 | 42.82 | |||||||||||||
2011 | 6.77 | 13.89 | 24.29 | 40.62 | 52.66 | 62.63 | 72.56 | 67.56 | 57.03 | 49.18 | 33.65 | 20.94 | 41.82 | |||||||||||||
2012 | 15.55 | 23.36 | 41.52 | 43.14 | a | 55.61 | 63.72 | 73.63 | 66.08 | a | 55.81 | a | 42.35 | 30.25 | 18.82 | 44.15 | ||||||||||
2013 | 10.34 | 11.66 | 21.10 | 32.40 | 48.90 | 59.18 | 65.10 | a | 64.97 | 56.52 | 44.32 | c | 25.13 | d | 4.65 | 37.02 | ||||||||||
2014 | -0.85 | 2.02 | 15.68 | 34.37 | 52.58 | 64.23 | 65.97 | 65.65 | 56.58 | 44.02 | 20.83 | 21.00 | 36.84 | |||||||||||||
2015 | 11.39 | 3.80 | 28.26 | 42.50 | 53.50 | 63.17 | 68.94 | 64.74 | 63.12 | 44.94 | 35.78 | 27.26 | 42.28 | |||||||||||||
2016 | 11.34 | 17.26 | 32.77 | 40.72 | 54.45 | 64.10 | 69.31 | 68.06 | 59.58 | 46.83 | a | 38.12 | 16.23 | 43.23 | ||||||||||||
2017 | 14.73 | 22.66 | 25.53 | 42.02 | 51.55 | a | 62.95 | 66.90 | 61.95 | 59.50 | 46.18 | 25.78 | 11.56 | 40.94 | ||||||||||||
2018 | 8.81 | 7.98 | 25.45 | 31.13 | 59.81 | 64.85 | 69.15 | 67.23 | 58.67 | 39.97 | 22.50 | 21.35 | 39.74 | |||||||||||||
2019 | 6.81 | 7.38 | 20.77 | 39.07 | 49.03 | 62.72 | 70.27 | 64.98 | a | 58.72 | 41.71 | 24.00 | 15.52 | 38.41 | ||||||||||||
2020 | 16.40 | 13.45 | 29.48 | 38.57 | a | 53.79 | 65.43 | 70.74 | 67.34 | 54.25 | 37.61 | 33.14 | a | 18.97 | 41.60 | |||||||||||
2021 | 15.34 | 5.02 | 33.27 | 39.83 | 52.40 | 67.92 | 68.84 | 68.16 | 58.50 | 50.31 | 29.95 | 17.92 | 42.29 | |||||||||||||
2022 | 1.42 | 5.71 | 23.48 | 34.68 | 54.05 | 63.33 | 68.10 | 66.19 | 58.08 | 45.60 | 30.30 | 13.05 | 38.67 | |||||||||||||
2023 | 17.02 | 14.21 | 22.15 | 37.59 | b | 55.16 | 66.60 | 66.19 | 65.35 | 62.13 | 46.94 | 30.07 | 29.08 | 42.71 | ||||||||||||
2024 | 16.92 | 26.90 | 28.98 | 39.25 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.27 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 8.80 | 13.53 | 26.13 | 40.73 | 53.43 | 62.96 | 67.80 | 65.43 | 56.52 | 44.52 | 29.54 | 15.58 | 40.25 | |||||||||||||
S.D. | 6.05 | 6.42 | 4.93 | 3.80 | 3.27 | 2.71 | 2.70 | 2.73 | 2.84 | 3.70 | 4.68 | 5.94 | 1.94 | |||||||||||||
SKEW | -0.17 | 0.37 | 0.42 | -0.08 | -0.10 | -0.41 | -0.03 | -0.35 | -0.04 | 0.19 | -0.25 | -0.44 | -0.06 | |||||||||||||
MAX | 23.87 | 29.38 | 41.52 | 48.85 | 59.87 | 67.92 | 73.65 | 70.30 | 63.12 | 55.42 | 41.95 | 29.08 | 44.15 | |||||||||||||
MIN | -4.68 | 0.88 | 15.68 | 31.13 | 47.32 | 56.95 | 60.37 | 59.50 | 48.77 | 36.85 | 19.28 | 0.21 | 36.32 | |||||||||||||
YRS | 73 | 72 | 71 | 70 | 70 | 66 | 70 | 69 | 68 | 67 | 72 | 73 | 59 |