YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1952 | ----- | z | ----- | z | ----- | z | ----- | z | 54.65 | h | 68.34 | a | 71.96 | e | 70.27 | 64.83 | a | 44.32 | c | 31.98 | a | 19.00 | a | 52.96 | e | |
1953 | 13.35 | d | 17.43 | 29.13 | 38.40 | a | 54.53 | 65.92 | e | 70.90 | b | 70.76 | b | 64.53 | j | 55.00 | a | 35.80 | 18.35 | 42.69 | a | |||||
1954 | 4.41 | b | 30.88 | d | 25.48 | a | 43.24 | c | 50.83 | a | 65.40 | 73.32 | 69.92 | 58.88 | 45.56 | 35.62 | n | 24.04 | c | 44.72 | a | |||||
1955 | 14.03 | a | 9.38 | 24.92 | a | 51.78 | 62.27 | 66.73 | q | 74.15 | r | 71.70 | p | 60.71 | b | 50.58 | 20.12 | 8.53 | 33.59 | c | ||||||
1956 | 9.98 | 10.91 | 23.82 | a | 37.03 | 56.27 | 70.57 | c | 68.20 | a | 69.15 | 58.65 | 54.05 | 29.97 | a | 21.89 | 42.54 | |||||||||
1957 | 4.84 | 16.55 | 27.87 | 43.27 | 54.10 | 63.75 | 75.02 | a | 69.44 | 56.77 | 45.21 | e | 31.27 | 24.74 | d | 42.73 | ||||||||||
1958 | 19.63 | a | 13.70 | 28.63 | a | 44.12 | 59.37 | 60.17 | 67.76 | 71.71 | 62.57 | 50.12 | e | 31.02 | 12.74 | 43.46 | ||||||||||
1959 | 6.16 | b | 9.48 | 31.95 | 44.11 | b | 56.16 | 69.33 | 72.00 | 74.23 | 60.74 | a | 41.77 | c | 22.31 | a | 25.97 | a | 42.85 | |||||||
1960 | 11.03 | b | 11.86 | 14.48 | 42.53 | a | 56.11 | 62.25 | b | 71.22 | d | 69.44 | d | 60.98 | a | 47.20 | c | 30.81 | c | 13.70 | a | 40.97 | ||||
1961 | 11.78 | a | 20.39 | 34.50 | b | 38.00 | 52.90 | 68.65 | c | 69.28 | b | 72.85 | a | 57.07 | 48.25 | a | 30.17 | g | 11.22 | b | 44.08 | a | ||||
1962 | 6.90 | a | 11.07 | 24.00 | a | 42.12 | a | 57.20 | a | 64.19 | a | 67.41 | b | 69.75 | c | 57.05 | 50.03 | a | 36.31 | a | 21.83 | d | 42.32 | |||
1963 | 4.27 | 16.23 | 34.90 | 46.22 | 55.84 | 69.38 | 71.88 | b | 69.71 | b | 63.00 | 57.77 | 35.71 | b | 9.81 | d | 44.56 | |||||||||
1964 | 17.58 | a | 21.39 | a | 21.80 | a | 45.71 | a | 59.37 | 66.52 | a | 74.02 | g | 66.69 | 57.84 | b | 48.18 | 30.12 | b | 9.16 | f | 43.52 | b | |||
1965 | 6.07 | a | 11.96 | a | 16.68 | 41.85 | 56.73 | 64.90 | a | 70.76 | 68.83 | a | 49.45 | 50.81 | b | 31.80 | e | 25.44 | d | 41.27 | ||||||
1966 | 0.73 | 10.77 | 33.48 | 37.55 | a | 53.34 | 65.77 | 75.40 | 66.11 | 58.80 | 47.56 | 26.87 | 19.16 | c | 41.30 | |||||||||||
1967 | 14.42 | 9.59 | 31.24 | 43.13 | 51.53 | a | 63.55 | 68.78 | b | 68.15 | a | 60.35 | 46.27 | 30.07 | a | 19.02 | d | 42.18 | ||||||||
1968 | 12.00 | b | 14.12 | 37.08 | 44.83 | 52.48 | 66.67 | 69.95 | 70.03 | 59.97 | 48.15 | 31.62 | 12.53 | 43.29 | ||||||||||||
1969 | 3.00 | 16.77 | 17.81 | 45.77 | 57.87 | 59.71 | b | 68.77 | 72.57 | a | 62.39 | b | 41.48 | 32.40 | 18.77 | 41.44 | ||||||||||
1970 | 3.93 | b | 15.95 | 22.08 | 41.03 | 57.02 | 69.33 | a | 74.72 | d | 71.42 | a | 60.77 | 47.53 | 27.88 | b | 14.58 | 42.19 | ||||||||
1971 | 4.62 | a | 14.98 | 29.76 | 46.42 | 54.24 | b | 68.93 | 67.26 | 71.12 | a | 60.57 | 49.16 | 30.63 | 13.66 | 42.61 | ||||||||||
1972 | 5.47 | 8.67 | 26.02 | 41.13 | 58.87 | a | 65.95 | a | 68.92 | 70.39 | 58.33 | a | 44.69 | 28.67 | a | 7.97 | 40.42 | |||||||||
1973 | 15.40 | 20.95 | 37.18 | 43.20 | 56.16 | 66.62 | 71.50 | a | 74.63 | 58.48 | 53.32 | 29.58 | 13.52 | 45.04 | ||||||||||||
1974 | 8.98 | 16.00 | 27.50 | 44.63 | 53.27 | 65.93 | 76.21 | 67.88 | a | 58.17 | 51.03 | b | 32.35 | 22.19 | 43.68 | |||||||||||
1975 | 13.98 | 11.46 | 21.18 | a | 34.63 | 58.38 | b | 65.92 | 75.21 | 69.32 | 57.62 | 49.76 | b | 33.03 | 18.30 | d | 42.40 | |||||||||
1976 | 10.15 | 24.52 | 29.05 | 47.45 | b | 55.70 | a | 68.48 | a | 74.67 | a | 73.59 | c | 60.39 | c | 42.06 | d | 24.10 | 12.44 | 43.55 | ||||||
1977 | -0.78 | a | 21.81 | a | 32.74 | 50.62 | 64.95 | 66.92 | 72.68 | 64.42 | a | 59.77 | 47.45 | a | 26.38 | 10.35 | 43.11 | |||||||||
1978 | -0.81 | 6.20 | 25.05 | 42.53 | 58.13 | 65.86 | a | 70.28 | a | 71.62 | a | 65.03 | 48.32 | 26.33 | 12.16 | 40.89 | ||||||||||
1979 | -0.85 | a | 1.87 | a | 22.30 | a | 36.60 | 50.77 | 64.83 | 70.24 | 67.06 | 63.25 | 46.08 | 28.50 | 25.74 | 39.70 | ||||||||||
1980 | 12.53 | 14.05 | 23.76 | 48.28 | 60.61 | 66.38 | 72.48 | 69.15 | 60.35 | 45.26 | 35.47 | 18.39 | 43.89 | |||||||||||||
1981 | 18.00 | 22.02 | ----- | z | 50.43 | 56.42 | 64.32 | 71.76 | 70.13 | a | 60.48 | 45.34 | c | 35.31 | l | 12.50 | j | 50.99 | c | |||||||
1982 | -1.19 | m | 14.04 | b | 25.56 | 41.10 | 57.58 | 61.02 | 72.97 | 69.45 | 58.45 | 46.06 | 26.38 | 21.98 | a | 44.96 | a | |||||||||
1983 | 19.79 | 24.91 | 29.22 | b | 38.52 | b | 53.88 | a | 65.48 | a | 75.26 | 76.25 | a | 60.57 | 46.32 | a | 28.89 | c | -1.90 | a | 43.10 | |||||
1984 | 12.66 | 28.28 | f | 22.62 | b | 43.48 | a | 55.00 | 65.63 | 71.00 | 71.93 | a | 54.88 | 46.57 | a | 31.88 | 12.40 | a | 44.37 | a | ||||||
1985 | 8.18 | a | 13.91 | 33.84 | 48.55 | b | ----- | z | 63.27 | 71.90 | a | 65.23 | a | 56.10 | 46.50 | 18.20 | 5.53 | 39.20 | a | |||||||
1986 | 13.62 | c | 10.50 | 31.22 | a | 44.62 | 57.02 | a | 67.62 | b | 71.43 | a | 65.83 | a | 57.27 | 49.12 | a | 26.50 | 24.58 | 43.28 | ||||||
1987 | 21.23 | 30.39 | a | 32.38 | a | 53.20 | 62.23 | 69.72 | a | 74.34 | 68.02 | 61.92 | 44.45 | 34.89 | c | 23.43 | c | 48.02 | ||||||||
1988 | 9.29 | 14.92 | c | 31.21 | b | 46.97 | a | 64.16 | f | 74.43 | b | 74.63 | e | 72.11 | c | 59.62 | f | 43.52 | h | 28.82 | b | 20.40 | f | 44.05 | d | |
1989 | 17.65 | d | 2.71 | g | 24.13 | a | 44.62 | b | 56.90 | a | 64.45 | a | 75.12 | e | 69.95 | a | 59.64 | a | 48.52 | d | 27.24 | e | 8.82 | i | 48.82 | b |
1990 | 25.07 | c | 20.04 | b | 35.32 | c | 45.07 | a | 55.73 | a | 65.69 | c | 69.46 | e | 69.48 | d | 63.57 | 47.80 | c | 35.05 | 13.71 | b | 45.50 | |||
1991 | 10.85 | 24.52 | a | 33.05 | 47.65 | 59.50 | a | 69.86 | a | 70.79 | c | 71.00 | 59.52 | b | 45.75 | a | 23.47 | 22.94 | 44.91 | |||||||
1992 | 20.79 | 25.94 | e | 33.17 | b | 41.83 | 59.13 | 62.88 | a | 63.00 | b | 64.87 | a | 59.53 | a | 47.27 | 26.02 | 14.48 | a | 43.24 | ||||||
1993 | 9.75 | a | 10.54 | 26.35 | 41.25 | b | 56.85 | 62.98 | b | 66.87 | 69.25 | a | 56.22 | a | 45.66 | b | 27.31 | d | 18.57 | d | 40.97 | |||||
1994 | -1.13 | a | 6.80 | a | 30.87 | a | 45.45 | b | 60.69 | 68.47 | a | 68.57 | a | 68.07 | a | 63.71 | b | 50.42 | e | 35.45 | a | 21.45 | b | 43.23 | ||
1995 | 13.72 | b | 16.06 | b | 29.32 | a | 38.59 | c | 54.20 | c | 68.68 | b | 71.07 | a | 74.12 | a | 60.50 | a | 46.68 | a | 25.62 | a | 17.00 | l | 45.32 | a |
1996 | 5.37 | e | 16.17 | c | 20.21 | b | 39.23 | 54.54 | e | 68.11 | b | 69.00 | e | 71.85 | d | 60.36 | a | 48.22 | d | 16.60 | f | 7.22 | f | 45.31 | b | |
1997 | 6.30 | f | 15.52 | b | 24.36 | b | 37.46 | b | 54.02 | e | 68.31 | i | 70.93 | d | 70.02 | i | 64.17 | i | 50.23 | g | 25.33 | f | 23.17 | d | 37.58 | f |
1998 | 14.62 | c | 27.90 | c | 25.37 | d | 46.96 | b | 61.84 | b | 63.41 | b | 73.26 | b | 73.13 | a | 67.70 | e | 49.94 | 33.22 | c | 24.57 | c | 46.83 | ||
1999 | 9.50 | a | 26.52 | c | 33.84 | b | 46.57 | b | 57.87 | a | 66.79 | a | 73.55 | 71.27 | 59.37 | 48.38 | a | 41.81 | a | 27.67 | d | 46.93 | ||||
2000 | 14.83 | b | 26.79 | a | 37.62 | a | 44.60 | 58.90 | a | 65.17 | a | 72.02 | 71.84 | 61.55 | a | 50.94 | 26.54 | c | 3.36 | b | 44.51 | |||||
2001 | 16.58 | 6.56 | c | 23.23 | 42.60 | 58.27 | 66.86 | b | 74.12 | a | 73.40 | a | 61.78 | a | 47.59 | b | 42.03 | 24.02 | a | 44.75 | ||||||
2002 | 20.95 | c | 27.23 | b | 20.75 | a | 42.52 | a | 53.04 | c | 70.31 | a | 76.02 | a | 70.02 | d | 64.80 | b | 39.32 | a | 32.53 | 21.55 | c | 44.92 | ||
2003 | 12.97 | a | 12.84 | c | 27.67 | b | 46.88 | 55.47 | a | 65.64 | b | 71.96 | d | 74.02 | e | 60.61 | h | 51.31 | g | 28.30 | g | 22.42 | f | 45.93 | d | |
2004 | 9.79 | g | 19.12 | c | 33.98 | f | 49.02 | i | 54.50 | e | 63.06 | d | 70.96 | h | 65.45 | a | 63.80 | e | 48.83 | a | 37.34 | a | 23.24 | d | 46.92 | d |
2005 | 12.77 | g | 22.69 | a | 30.65 | 48.90 | 52.12 | j | 68.80 | 72.50 | e | 69.79 | c | 66.08 | 48.36 | b | 34.04 | d | 16.68 | a | 47.85 | b | ||||
2006 | 24.74 | 16.04 | 29.57 | a | 49.85 | 57.85 | 67.57 | 76.69 | 71.92 | 57.45 | 44.07 | a | 32.92 | 26.50 | 46.26 | |||||||||||
2007 | 14.71 | 8.68 | 31.04 | e | 40.62 | 60.97 | 68.65 | 73.85 | 69.81 | 62.57 | 51.58 | 32.70 | 13.40 | 44.05 | ||||||||||||
2008 | 10.66 | 14.44 | e | 26.10 | 39.67 | 54.98 | 64.85 | f | 70.96 | d | 69.83 | a | 61.58 | 47.35 | 32.08 | 9.18 | 39.71 | a | ||||||||
2009 | 5.87 | a | 14.95 | 24.98 | 40.63 | 56.70 | c | 63.73 | 66.77 | 66.84 | 63.67 | 40.15 | 40.03 | 11.47 | 41.32 | |||||||||||
2010 | 8.56 | 11.54 | d | 33.26 | 50.92 | 55.06 | 65.80 | 69.58 | 71.48 | 55.90 | 49.11 | 29.82 | 10.42 | 42.62 | ||||||||||||
2011 | 4.11 | 9.96 | 19.92 | 37.70 | 52.34 | 63.42 | d | 74.11 | 71.05 | a | 60.30 | 51.45 | 33.98 | 25.45 | 41.98 | |||||||||||
2012 | 20.87 | 21.91 | 41.21 | 48.02 | 59.37 | 68.78 | 77.37 | 70.33 | a | 61.72 | 45.76 | 31.93 | 17.05 | 47.03 | ||||||||||||
2013 | 12.85 | 13.62 | 18.12 | b | 31.67 | 53.85 | 64.79 | b | 71.60 | a | 71.24 | 66.72 | 45.27 | 30.60 | 8.32 | 40.72 | ||||||||||
2014 | 6.10 | 6.25 | 25.76 | 40.97 | 56.47 | 65.85 | 68.08 | 69.63 | d | 61.35 | 50.03 | 22.37 | 19.97 | 41.07 | ||||||||||||
2015 | 16.94 | 10.59 | 32.53 | 47.00 | 54.13 | 67.12 | 72.66 | 69.40 | 67.02 | 52.08 | a | 38.03 | a | 22.92 | 45.87 | |||||||||||
2016 | 16.27 | 23.43 | 37.50 | 44.97 | 59.06 | 69.68 | 71.94 | 71.94 | 63.10 | 50.89 | 42.97 | 12.69 | e | 47.04 | ||||||||||||
2017 | 14.65 | 26.77 | 26.87 | e | 45.77 | 57.13 | 67.50 | 74.58 | 67.69 | 63.68 | 49.45 | 32.25 | 18.24 | 45.38 | ||||||||||||
2018 | 15.05 | 9.43 | 26.23 | 33.33 | 63.27 | 70.85 | 72.15 | 71.10 | 61.97 | 42.31 | 24.97 | 21.67 | g | 44.60 | a | |||||||||||
2019 | 7.48 | 2.75 | 21.77 | 42.65 | 53.08 | 67.82 | 71.79 | 67.16 | b | 63.03 | 41.71 | 29.30 | 18.52 | 40.59 | ||||||||||||
2020 | 13.03 | a | 17.45 | 31.63 | 40.53 | 54.58 | 69.92 | 72.92 | 71.61 | 58.67 | a | 40.85 | 37.03 | 24.11 | 44.36 | |||||||||||
2021 | 21.46 | c | 9.50 | c | 37.11 | 43.10 | 59.18 | f | 72.65 | 74.06 | 70.58 | a | 64.68 | 51.79 | 36.07 | a | 18.44 | 45.40 | a | |||||||
2022 | 8.37 | 11.09 | 27.61 | 35.57 | 55.26 | 69.00 | 72.16 | 70.42 | 64.73 | 49.58 | 28.77 | 11.45 | 42.00 | |||||||||||||
2023 | 13.16 | 15.43 | 18.24 | 35.30 | 60.65 | 71.23 | 70.35 | 71.29 | 65.07 | 48.10 | 36.10 | 30.50 | 44.62 | |||||||||||||
2024 | 14.64 | c | 29.46 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.05 | j |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.42 | 15.97 | 27.91 | 43.16 | 56.62 | 66.63 | 71.74 | 70.14 | 60.79 | 47.63 | 31.00 | 17.44 | 43.36 | |||||||||||||
S.D. | 6.30 | 6.87 | 5.77 | 4.56 | 3.03 | 2.85 | 2.74 | 2.41 | 3.22 | 3.50 | 5.04 | 6.61 | 2.00 | |||||||||||||
SKEW | -0.04 | 0.36 | -0.05 | -0.20 | 0.41 | 0.01 | -0.40 | -0.20 | -0.39 | -0.02 | 0.02 | -0.43 | 0.38 | |||||||||||||
MAX | 25.07 | 30.88 | 41.21 | 53.20 | 64.95 | 74.43 | 77.37 | 76.25 | 67.70 | 57.77 | 42.97 | 30.50 | 48.02 | |||||||||||||
MIN | -1.13 | 1.87 | 14.48 | 31.67 | 50.77 | 59.71 | 63.00 | 64.42 | 49.45 | 39.32 | 18.20 | -1.90 | 39.70 | |||||||||||||
YRS | 68 | 70 | 69 | 70 | 67 | 69 | 69 | 70 | 68 | 69 | 66 | 64 | 51 |