YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.60 | 24.31 | 31.95 | j | ||
1955 | 17.47 | 15.85 | a | 29.66 | 54.08 | 63.79 | 67.09 | b | 79.07 | a | 76.50 | a | 60.98 | d | 50.78 | a | 26.83 | 12.31 | g | 49.28 | a | |||||
1956 | 12.07 | a | 15.85 | b | 27.04 | e | 41.98 | b | 60.18 | 75.61 | l | 69.26 | 71.39 | 61.46 | c | 58.24 | b | 33.47 | 25.06 | 43.27 | a | |||||
1957 | 10.69 | 25.21 | 32.53 | 46.10 | e | 57.32 | a | 68.52 | e | 78.42 | a | 70.00 | c | 60.00 | a | 47.78 | a | 33.27 | b | 26.95 | 46.40 | |||||
1958 | 23.17 | a | 15.20 | a | 32.21 | 47.57 | b | 61.71 | 65.13 | 68.88 | b | 72.71 | 64.27 | b | 52.74 | h | 39.26 | k | 17.90 | 46.88 | b | |||||
1959 | 10.07 | c | 13.91 | a | 32.57 | a | 47.83 | a | 61.88 | a | 71.48 | a | 72.23 | 74.68 | 61.92 | 45.53 | 25.12 | 29.77 | 45.58 | |||||||
1960 | 18.27 | 18.12 | 17.92 | 47.13 | 58.87 | 66.22 | a | 71.81 | 71.97 | 62.82 | 50.74 | 37.47 | 19.16 | 45.04 | ||||||||||||
1961 | 15.03 | 23.30 | 32.05 | 40.95 | 55.19 | 69.02 | 70.97 | 71.16 | 60.45 | 52.08 | 33.30 | e | 16.85 | 45.03 | ||||||||||||
1962 | 9.57 | b | 16.96 | 24.53 | 43.94 | l | 63.76 | 68.13 | 70.02 | 70.45 | 59.05 | 53.13 | 39.60 | 22.92 | 45.28 | a | ||||||||||
1963 | 6.40 | 17.29 | 36.89 | 49.08 | 58.74 | 71.68 | 72.55 | 69.15 | 64.85 | 60.84 | 39.85 | 12.31 | 46.64 | |||||||||||||
1964 | 24.26 | 27.88 | a | 27.48 | 47.98 | 64.84 | 69.21 | b | 75.42 | 67.90 | 62.88 | 51.24 | 38.83 | 16.03 | a | 47.83 | ||||||||||
1965 | 11.86 | c | 14.88 | b | ----- | z | ----- | z | 61.08 | f | 69.30 | 72.81 | 68.87 | a | 55.46 | f | ----- | z | 29.81 | l | 30.63 | a | 44.72 | f | ||
1966 | ----- | z | ----- | z | ----- | z | ----- | z | 62.58 | m | 72.20 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | 45.11 | h | 50.39 | 65.60 | 67.85 | 64.81 | 57.02 | a | 50.53 | l | 33.40 | e | 21.59 | c | 51.52 | e | ||||
1968 | 15.05 | 15.05 | 36.22 | a | 45.87 | 52.11 | 67.55 | b | 69.50 | a | 67.95 | 59.85 | 51.25 | c | 34.27 | 18.65 | 44.44 | |||||||||
1969 | 8.27 | 18.72 | c | 19.66 | 45.93 | a | 57.76 | 60.53 | 71.73 | a | 69.63 | a | 60.30 | 46.87 | a | 34.14 | a | 20.08 | 42.80 | |||||||
1970 | 2.38 | a | 15.98 | 25.77 | 45.85 | 58.95 | 69.55 | 71.85 | 68.70 | a | 60.38 | b | 47.92 | 33.92 | 16.40 | a | 43.14 | |||||||||
1971 | 8.31 | b | 16.57 | 26.56 | 47.28 | a | 53.75 | a | 70.74 | a | 66.83 | a | 67.23 | 60.48 | a | 55.15 | 34.90 | 19.35 | a | 43.93 | ||||||
1972 | 8.57 | a | 13.29 | a | 29.70 | a | 41.53 | a | 59.62 | c | 65.29 | a | 67.66 | b | 67.55 | b | 58.43 | 46.48 | 33.48 | 12.98 | 42.05 | |||||
1973 | 17.53 | 21.21 | 39.16 | 43.90 | 55.85 | 69.00 | 71.16 | 71.47 | b | 60.50 | 54.32 | 35.43 | 16.42 | a | 46.33 | |||||||||||
1974 | 14.06 | 19.95 | 33.13 | 46.95 | 54.98 | 65.97 | 74.82 | 67.60 | 56.50 | a | 50.92 | 35.03 | a | 22.35 | 45.19 | |||||||||||
1975 | 17.83 | b | 14.65 | a | 23.26 | 38.23 | 61.60 | 66.93 | 73.69 | 71.42 | 57.03 | 53.50 | 37.93 | 22.88 | a | 44.91 | ||||||||||
1976 | 15.33 | a | 29.54 | d | 32.24 | b | 49.73 | b | 56.53 | 68.58 | 72.69 | b | 69.72 | b | 60.60 | 43.13 | 27.77 | 11.81 | b | 44.81 | ||||||
1977 | ----- | z | 23.98 | 37.52 | 53.12 | a | 66.21 | 68.20 | ----- | z | 67.13 | 63.63 | 47.23 | 33.23 | 16.97 | 47.72 | b | |||||||||
1978 | 6.92 | 12.11 | 32.35 | 47.03 | 61.79 | b | 69.13 | 71.40 | 70.60 | 67.87 | 50.21 | 31.71 | a | 14.66 | 44.65 | |||||||||||
1979 | 1.73 | 8.93 | 27.61 | 42.52 | 58.12 | c | 69.31 | a | 71.95 | 68.97 | 64.18 | 49.21 | 32.68 | 27.86 | b | 43.59 | ||||||||||
1980 | 17.73 | 17.84 | 31.31 | b | 48.97 | a | 61.02 | 70.08 | 73.89 | 70.53 | 63.78 | 46.81 | 38.57 | 20.10 | 46.72 | |||||||||||
1981 | 17.35 | g | 25.15 | a | 39.26 | 52.66 | a | 58.55 | 70.48 | 72.82 | 68.26 | 61.43 | 48.27 | 40.44 | e | 16.87 | 50.38 | a | ||||||||
1982 | 0.72 | f | 17.45 | 31.96 | c | 44.66 | a | 61.81 | 64.32 | b | 73.84 | 70.18 | a | 61.42 | 51.16 | 30.35 | c | 26.25 | c | 48.49 | a | |||||
1983 | 20.07 | d | 26.31 | d | 33.63 | e | 42.18 | 56.26 | 68.79 | a | 76.19 | b | 76.40 | a | 64.26 | g | 50.26 | 34.66 | a | 2.98 | 44.34 | a | ||||
1984 | 15.61 | 24.71 | 23.28 | a | 45.80 | b | 58.71 | 69.93 | a | 72.79 | 72.67 | a | 60.65 | 52.11 | 33.38 | e | 20.05 | b | 45.81 | |||||||
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.27 | 71.19 | b | 66.85 | 61.96 | c | 48.98 | d | 23.41 | a | 7.83 | a | 49.64 | e | ||
1986 | 19.19 | 16.84 | 37.82 | a | 50.87 | d | 60.76 | 71.67 | a | 74.63 | a | 66.32 | 62.34 | a | ----- | z | ----- | z | ----- | z | 51.16 | c | ||||
1987 | ----- | z | ----- | z | ----- | z | ----- | z | 67.72 | b | 72.78 | a | 75.66 | 68.35 | 63.02 | a | 46.21 | 39.38 | 25.62 | a | 57.34 | d | ||||
1988 | 9.66 | 15.35 | c | 36.58 | 47.55 | a | 64.85 | e | 74.43 | a | 74.22 | a | 74.47 | 64.57 | a | 45.35 | a | 34.95 | 20.77 | a | 46.89 | |||||
1989 | 26.52 | a | 13.68 | 29.07 | a | 46.93 | b | 59.90 | a | 68.66 | a | 74.68 | 71.35 | 60.98 | 51.44 | 30.60 | 12.39 | 45.52 | ||||||||
1990 | 28.23 | a | 25.96 | 37.48 | a | 47.83 | 57.29 | 71.30 | 71.29 | 71.03 | 65.33 | 49.48 | 38.73 | 16.13 | 48.34 | |||||||||||
1991 | 11.65 | 26.64 | 35.95 | 50.38 | 62.94 | 73.55 | a | 72.69 | 70.98 | 61.52 | 48.50 | b | 25.12 | a | 24.19 | 47.01 | ||||||||||
1992 | 25.03 | 28.47 | 36.90 | a | 44.79 | a | 60.68 | 67.48 | 65.76 | 65.79 | 61.35 | 48.61 | 31.12 | 20.70 | a | 46.39 | ||||||||||
1993 | 13.63 | 15.79 | 26.52 | 43.85 | 57.77 | 66.03 | a | 71.40 | 70.56 | 56.78 | 48.81 | 31.58 | 21.97 | 43.72 | ||||||||||||
1994 | 5.81 | 12.12 | 36.47 | 48.07 | 62.60 | 70.81 | a | 69.23 | a | 67.27 | 65.05 | a | 52.45 | a | 38.05 | 22.47 | 45.87 | |||||||||
1995 | 17.65 | a | 22.52 | 34.22 | a | 42.93 | 56.68 | 70.05 | 73.13 | a | 75.06 | 60.07 | 49.78 | a | 28.77 | 22.10 | 46.08 | |||||||||
1996 | 12.08 | 21.45 | 28.81 | 43.72 | 55.87 | 70.09 | a | 70.15 | a | 69.18 | 60.17 | 51.05 | 25.84 | b | 14.03 | 43.54 | ||||||||||
1997 | 11.94 | 21.84 | 33.52 | 44.15 | 54.97 | a | 71.23 | 72.27 | 68.98 | 64.00 | 52.79 | 28.40 | 27.28 | f | 47.64 | a | ||||||||||
1998 | 17.28 | f | 30.77 | 30.77 | 50.08 | 64.83 | d | 77.08 | x | 74.38 | e | 70.57 | a | 66.84 | a | 50.43 | b | 38.21 | d | 30.78 | h | 52.99 | c | |||
1999 | 11.83 | b | 27.75 | 33.60 | a | 46.50 | a | 60.14 | b | 67.97 | 74.98 | b | 68.87 | 61.87 | c | 47.56 | 42.05 | b | 24.76 | d | 47.32 | |||||
2000 | 15.02 | b | 27.59 | a | 40.37 | 46.24 | c | 60.93 | a | 65.91 | b | 70.65 | 69.63 | a | 61.20 | e | 51.61 | 28.18 | 5.36 | c | 45.22 | |||||
2001 | 17.89 | c | 11.82 | i | 24.98 | b | 47.43 | b | 61.00 | a | 69.05 | b | 74.63 | 71.44 | 59.98 | b | 48.22 | d | 47.84 | e | 29.16 | 50.15 | a | |||
2002 | 24.98 | d | 27.21 | b | 25.52 | b | ----- | z | ----- | z | 76.42 | r | 75.39 | d | 68.38 | c | 61.11 | h | 42.26 | 31.59 | b | 26.39 | c | 40.21 | d | |
2003 | 15.02 | c | 15.48 | 29.79 | c | 47.14 | a | 54.50 | d | 66.69 | d | 70.87 | a | 71.96 | e | 59.64 | e | 49.85 | 32.07 | c | 22.91 | c | 44.66 | |||
2004 | 15.42 | m | 18.89 | b | 36.68 | 47.98 | c | 57.50 | f | 64.81 | f | 68.71 | 64.14 | c | 65.08 | e | 49.61 | 37.72 | c | 24.04 | c | 45.87 | c | |||
2005 | 13.60 | a | 27.21 | 31.33 | h | 50.53 | 55.08 | a | 72.46 | g | 72.96 | c | 68.45 | b | 62.87 | g | 50.81 | 36.24 | a | 14.17 | b | 43.23 | c | |||
2006 | 26.39 | l | 16.33 | y | ----- | z | 52.42 | 58.27 | a | 67.73 | d | 74.57 | c | 70.44 | 58.10 | f | 45.63 | 35.02 | b | 27.20 | a | 53.91 | d | |||
2007 | 16.60 | b | 6.63 | e | 37.25 | e | 43.50 | b | 63.98 | 70.12 | f | 72.00 | d | 70.16 | f | 61.90 | i | 53.55 | 33.98 | b | 14.45 | c | 37.99 | c | ||
2008 | 11.15 | a | 13.97 | j | 28.14 | c | 42.61 | b | 55.10 | g | 67.44 | d | 71.22 | d | 68.12 | f | 61.69 | c | 48.37 | d | 33.91 | c | 12.00 | d | 41.84 | c |
2009 | 7.23 | e | 21.47 | m | 32.42 | e | 44.18 | b | 57.94 | g | 65.84 | h | 66.63 | e | 63.69 | j | 61.46 | g | 41.70 | c | 40.45 | a | 13.34 | b | 35.14 | e |
2010 | 9.08 | e | 11.23 | m | 33.22 | f | 52.25 | b | 58.57 | d | 67.98 | e | 71.96 | f | 71.00 | m | 60.33 | f | 51.87 | a | 33.68 | e | 14.35 | 41.11 | e | |
2011 | 12.55 | j | 16.92 | c | 29.58 | m | 44.50 | b | 56.76 | b | 66.10 | d | 75.72 | a | 70.12 | f | 59.30 | h | 51.22 | b | 34.22 | g | 25.16 | c | 48.05 | e |
2012 | 24.53 | n | 26.61 | b | 46.21 | e | 49.42 | e | 62.74 | b | 70.94 | e | 76.15 | a | 71.08 | g | 61.41 | g | 46.52 | c | 37.25 | j | 22.59 | d | 50.15 | d |
2013 | 17.86 | m | 17.92 | b | 24.85 | e | 39.16 | e | 55.81 | d | 68.69 | c | 71.81 | b | 72.24 | l | 65.40 | f | 48.11 | c | 30.38 | b | 12.84 | c | 41.06 | c |
2014 | 8.96 | f | 10.35 | h | 26.29 | j | 42.92 | d | 56.21 | b | 68.28 | g | 65.84 | l | 68.58 | l | 59.73 | d | 49.08 | 25.08 | e | 22.21 | e | 42.54 | f | |
2015 | 18.10 | f | 12.25 | l | 37.59 | h | 48.75 | f | 55.67 | g | 68.10 | e | 69.27 | e | 64.35 | n | 66.66 | e | 50.78 | b | 37.59 | g | 27.52 | g | 63.70 | h |
2016 | 14.36 | f | 20.53 | n | 37.82 | c | 50.00 | p | 57.67 | b | 71.28 | e | 71.37 | h | 70.14 | m | 64.70 | e | 50.72 | m | 42.70 | b | 19.98 | h | 54.83 | g |
2017 | 20.27 | g | 28.76 | k | 27.23 | p | 47.02 | b | 54.89 | i | 68.94 | d | 71.93 | h | 64.84 | l | 63.00 | j | 49.64 | b | 31.32 | k | 19.14 | f | 55.20 | i |
2018 | 11.83 | j | 13.52 | c | 31.03 | o | 31.95 | b | 62.85 | d | 71.00 | c | 70.58 | 68.27 | 63.27 | 43.73 | 25.52 | 22.40 | 47.31 | b | ||||||
2019 | 12.66 | 7.89 | 25.22 | a | 44.10 | 52.19 | b | 67.30 | b | 71.72 | a | 65.89 | 64.33 | 43.21 | c | 28.45 | 21.53 | a | 42.04 | |||||||
2020 | 17.52 | 17.96 | b | 34.92 | 42.02 | a | 55.98 | b | 71.52 | c | 71.40 | a | 68.31 | d | 59.28 | a | 41.47 | 36.93 | a | 23.61 | 45.08 | |||||
2021 | 20.28 | d | 7.86 | 37.95 | 45.15 | 57.59 | d | 72.10 | 70.19 | 69.04 | d | 61.78 | l | 51.68 | c | 34.04 | b | 24.47 | 44.58 | a | ||||||
2022 | 9.10 | 12.96 | 31.84 | 38.58 | 57.90 | 68.95 | 71.44 | 68.25 | c | 61.00 | 47.63 | 33.20 | 14.79 | 42.97 | ||||||||||||
2023 | 18.75 | i | 17.32 | c | 26.69 | g | 44.07 | h | 61.10 | j | 69.86 | l | 66.47 | n | 69.89 | m | 61.33 | x | 49.31 | e | 35.75 | 30.34 | 33.18 | h | ||
2024 | 13.79 | j | 34.29 | h | 35.04 | f | 47.30 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 14.23 | 19.05 | 31.77 | 45.96 | 59.07 | 68.79 | 72.16 | 69.74 | 61.76 | 49.40 | 33.90 | 19.78 | 45.16 | |||||||||||||
S.D. | 6.01 | 6.06 | 5.60 | 4.00 | 3.67 | 2.44 | 2.70 | 2.61 | 2.55 | 3.57 | 4.92 | 6.04 | 1.59 | |||||||||||||
SKEW | 0.29 | 0.11 | -0.17 | -0.60 | 0.06 | -0.42 | 0.03 | 0.52 | 0.16 | 0.20 | 0.03 | -0.45 | -0.15 | |||||||||||||
MAX | 28.23 | 30.77 | 46.21 | 54.08 | 67.72 | 74.43 | 79.07 | 76.50 | 67.87 | 60.84 | 47.84 | 30.63 | 48.34 | |||||||||||||
MIN | 1.73 | 6.63 | 17.92 | 31.95 | 50.39 | 60.53 | 65.76 | 64.14 | 56.50 | 41.47 | 23.41 | 2.98 | 42.04 | |||||||||||||
YRS | 50 | 56 | 55 | 59 | 59 | 59 | 62 | 56 | 54 | 63 | 62 | 62 | 34 |