YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.17 | o | 23.70 | d | 23.70 | k |
1957 | 19.03 | a | 31.83 | b | 40.37 | 45.54 | c | 55.52 | 63.87 | 70.85 | a | 70.40 | a | 59.16 | a | 47.24 | b | 31.29 | a | 28.89 | 47.00 | |||||
1958 | 21.00 | b | 35.14 | 36.19 | 44.92 | e | 62.44 | e | 65.87 | 70.23 | a | 73.56 | 61.16 | a | 50.61 | 33.88 | a | 33.45 | 49.04 | |||||||
1959 | 30.75 | a | 30.35 | a | 38.52 | 47.77 | 51.28 | a | 66.12 | 71.32 | 68.65 | 57.52 | a | 47.74 | 34.93 | c | 25.17 | a | 47.51 | |||||||
1960 | 18.09 | c | 18.97 | l | 37.60 | a | 47.23 | 54.47 | b | 65.60 | 75.22 | b | 67.73 | 63.72 | 48.50 | 36.86 | a | 20.26 | 48.66 | a | ||||||
1961 | 24.68 | 33.36 | 38.95 | 44.93 | b | 56.86 | b | 68.79 | a | 74.34 | 73.82 | a | 56.25 | 47.28 | a | 33.95 | a | 27.11 | 48.36 | |||||||
1962 | 17.97 | 28.50 | 34.85 | 51.13 | d | 55.58 | 64.45 | 70.69 | 68.76 | 63.17 | 54.07 | c | 39.80 | 29.74 | d | 48.23 | ||||||||||
1963 | 20.72 | a | 39.56 | c | 39.37 | d | 44.41 | g | 61.25 | c | 61.52 | b | 73.15 | a | 72.34 | 65.07 | 54.95 | 35.86 | b | 20.87 | a | 49.51 | a | |||
1964 | 16.32 | a | 15.18 | a | 25.36 | b | 45.03 | 55.62 | a | 61.70 | ----- | z | 69.63 | 59.48 | 51.18 | 36.45 | b | 30.77 | 42.43 | a | ||||||
1965 | 27.12 | a | 31.20 | 34.87 | 49.36 | a | 53.32 | a | 62.85 | 70.52 | a | 67.73 | a | 53.55 | 51.00 | 39.19 | a | 19.72 | a | 46.70 | ||||||
1966 | 24.52 | 22.46 | 35.60 | b | 46.12 | 58.53 | 63.20 | 73.44 | 68.53 | 62.54 | c | 45.69 | 38.02 | a | 20.73 | a | 46.62 | |||||||||
1967 | 26.93 | a | 32.52 | 37.47 | b | 41.22 | a | 53.32 | 60.74 | a | 71.09 | b | 71.84 | 62.95 | a | 48.65 | 38.59 | a | 18.66 | 47.00 | ||||||
1968 | 14.82 | 24.57 | 39.61 | 42.59 | a | 52.72 | a | 63.32 | 73.16 | 65.82 | 57.93 | a | ----- | z | 33.72 | 24.81 | 44.82 | a | ||||||||
1969 | ----- | z | 23.74 | a | 25.97 | 48.05 | 61.27 | 60.91 | c | 71.90 | 73.37 | 64.33 | 43.70 | d | 36.43 | b | 29.62 | a | 49.03 | a | ||||||
1970 | 28.89 | 36.55 | 36.75 | a | 40.82 | 54.52 | 63.87 | 70.84 | 73.45 | 56.40 | a | 43.13 | 38.32 | 25.00 | 47.38 | |||||||||||
1971 | 25.90 | 30.00 | 35.60 | 45.45 | 54.81 | b | 62.30 | b | 72.02 | a | 73.28 | b | 57.02 | b | 44.41 | b | 33.68 | b | 22.37 | 46.40 | ||||||
1972 | 25.50 | a | 31.50 | 43.09 | b | 45.17 | 57.95 | c | 66.83 | 71.33 | a | 71.26 | b | 57.63 | 49.52 | 35.98 | ----- | z | 50.52 | a | ||||||
1973 | 16.10 | 22.64 | 35.08 | a | 43.98 | 57.50 | 64.82 | 72.12 | e | 70.15 | d | 57.04 | d | 48.76 | 36.48 | 27.61 | 46.02 | |||||||||
1974 | 20.19 | 21.02 | 39.37 | 44.85 | 54.94 | 67.10 | 72.88 | a | 67.95 | c | 60.50 | b | 49.63 | 36.54 | c | 23.19 | 46.51 | |||||||||
1975 | 18.82 | c | 26.12 | b | 34.27 | a | 39.06 | d | 48.73 | 58.30 | 73.44 | 66.64 | b | 58.33 | 46.55 | 31.71 | a | 27.64 | b | 44.13 | ||||||
1976 | 19.30 | a | 19.91 | 24.90 | 44.28 | 57.66 | 60.90 | a | 72.26 | 66.24 | 61.40 | 46.24 | 36.41 | a | 25.94 | 44.62 | ||||||||||
1977 | 17.94 | 24.98 | 33.60 | 48.84 | b | 51.13 | 68.88 | a | 70.92 | g | 69.52 | c | 58.97 | a | 49.06 | 36.93 | 32.52 | b | 44.76 | a | ||||||
1978 | 30.13 | 33.55 | 42.40 | 45.43 | 50.73 | 61.68 | 70.65 | 66.68 | a | 57.43 | a | 50.30 | a | 29.95 | a | 20.88 | a | 46.65 | ||||||||
1979 | 10.27 | 21.82 | 32.98 | b | 44.89 | c | 54.15 | 62.53 | 71.05 | 70.48 | 63.76 | a | 51.17 | a | 29.98 | 25.30 | c | 44.87 | ||||||||
1980 | 26.57 | a | 30.55 | 36.97 | a | 47.88 | 52.98 | a | 60.85 | 70.37 | 65.80 | a | 61.40 | 47.45 | a | 36.02 | 24.66 | 46.79 | ||||||||
1981 | 26.11 | 26.75 | 40.31 | 47.32 | 52.29 | 61.29 | a | 71.50 | b | 73.06 | 64.35 | 47.10 | a | 40.27 | 32.82 | a | 48.60 | |||||||||
1982 | 21.07 | j | 20.45 | h | 38.17 | k | 43.17 | i | 53.43 | j | 63.98 | g | 70.77 | g | 74.98 | i | 60.39 | g | 46.57 | i | 33.76 | i | 26.16 | f | ----- | z |
1983 | 31.98 | i | 34.21 | g | 40.34 | i | 41.22 | g | 51.75 | i | 62.36 | l | 71.14 | m | 73.34 | 62.89 | b | 50.34 | b | 34.74 | e | 24.33 | d | 49.13 | g | |
1984 | 19.69 | e | 19.34 | a | 34.45 | c | 43.34 | e | 58.12 | f | 62.96 | e | 72.67 | d | 70.10 | b | 58.58 | d | 42.47 | b | 34.72 | a | 20.85 | e | 43.56 | a |
1985 | 11.04 | f | 12.24 | c | 24.29 | e | 48.55 | a | 56.15 | e | 63.10 | a | 72.65 | 65.98 | 55.45 | 46.41 | b | 25.33 | f | 15.47 | 46.03 | b | ||||
1986 | 18.15 | 35.95 | 44.84 | 44.75 | 52.60 | 68.22 | c | 67.85 | 71.85 | 54.88 | 47.31 | 36.03 | 26.48 | 47.41 | ||||||||||||
1987 | 14.13 | a | 31.50 | a | 38.92 | a | 49.98 | 57.63 | a | 64.52 | a | 68.13 | 67.85 | a | 61.82 | 51.67 | b | 36.06 | c | 22.63 | a | 47.07 | ||||
1988 | 16.77 | a | 25.86 | 36.71 | 47.91 | a | 54.77 | 68.36 | b | 73.58 | a | 69.66 | 57.31 | a | 54.06 | 35.92 | 18.83 | d | 46.65 | |||||||
1989 | 12.53 | a | 16.79 | 38.48 | a | 50.13 | 54.81 | 62.28 | 74.50 | a | 69.82 | 60.41 | a | 48.47 | a | 36.47 | 23.48 | 45.68 | ||||||||
1990 | 26.77 | 24.91 | 40.63 | a | 51.33 | d | 52.69 | b | 64.04 | b | 72.40 | 69.85 | 65.13 | c | 47.57 | c | 36.57 | b | 15.31 | d | 47.27 | |||||
1991 | 14.98 | a | 25.91 | 38.32 | 43.42 | 50.79 | 62.29 | a | 71.45 | a | 71.25 | a | 59.76 | a | 48.58 | 34.35 | 18.42 | 44.96 | ||||||||
1992 | 14.11 | 30.43 | 44.65 | 52.31 | a | 59.66 | 65.60 | a | 68.35 | 71.15 | 59.35 | 50.95 | b | 29.43 | c | 18.79 | 47.06 | |||||||||
1993 | 16.08 | 19.84 | 34.82 | 44.45 | 58.38 | b | 58.93 | 62.50 | a | 65.97 | 58.00 | 47.20 | a | 27.88 | b | 23.98 | 43.17 | |||||||||
1994 | 30.87 | a | 28.43 | 41.75 | a | 49.16 | a | 58.95 | 65.90 | a | 72.42 | 72.31 | 62.72 | 47.19 | 28.95 | 27.15 | 48.81 | |||||||||
1995 | 27.87 | 35.32 | 39.58 | 44.33 | a | 52.10 | a | 59.79 | a | 69.38 | a | 69.32 | 61.10 | 45.87 | 40.72 | a | 33.43 | a | 48.24 | |||||||
1996 | 28.56 | 25.32 | a | 38.60 | a | 45.86 | a | 54.11 | 65.47 | 72.10 | a | 69.19 | 57.29 | a | 48.68 | a | 38.33 | a | 30.93 | d | 47.87 | |||||
1997 | 27.29 | b | 27.14 | 40.54 | c | 43.93 | 57.58 | 64.43 | a | 68.18 | 70.02 | a | 61.80 | b | 46.95 | b | 36.52 | a | 18.83 | b | 46.93 | |||||
1998 | 29.45 | c | 33.70 | c | 36.53 | b | 45.52 | a | 54.27 | 57.98 | b | 73.31 | 70.77 | a | 63.43 | 48.12 | a | 38.93 | c | 22.83 | d | 47.90 | ||||
1999 | 30.72 | a | 30.30 | e | 41.29 | b | 43.40 | 52.24 | 62.60 | 70.76 | 69.95 | 58.38 | a | 49.18 | 41.62 | b | 25.27 | a | 47.98 | |||||||
2000 | 31.34 | b | 35.80 | a | 38.55 | b | 49.63 | c | 56.55 | 64.33 | a | 72.42 | 72.52 | 58.91 | a | 48.72 | b | 29.50 | b | 25.18 | c | 48.62 | ||||
2001 | 14.08 | a | 23.85 | b | 38.95 | 46.14 | a | 58.08 | a | 63.83 | 72.76 | 71.97 | a | 63.52 | 49.86 | c | 38.31 | a | 18.53 | b | 46.66 | |||||
2002 | 19.55 | a | 12.05 | 30.89 | 47.32 | 54.40 | a | 64.87 | 75.00 | 68.16 | 61.43 | a | 45.26 | 33.62 | 30.53 | b | 45.26 | |||||||||
2003 | 34.24 | b | 27.95 | 39.88 | c | 46.52 | a | 55.83 | b | 64.57 | 75.40 | b | 73.35 | 59.21 | a | 52.18 | 31.31 | a | 31.33 | a | 49.31 | |||||
2004 | 13.48 | a | 20.62 | a | 39.77 | 50.33 | i | 54.81 | 64.22 | 71.55 | 67.79 | 59.12 | 48.87 | 34.60 | 28.02 | b | 45.71 | a | ||||||||
2005 | 24.50 | 18.48 | 33.29 | 46.35 | 55.52 | a | 60.40 | 72.98 | 70.22 | a | 58.58 | 49.31 | 37.41 | b | 25.87 | d | 46.08 | |||||||||
2006 | 28.72 | d | 25.40 | b | 36.97 | a | 48.40 | 57.15 | a | 66.78 | 75.66 | 69.21 | 57.44 | c | 45.81 | 37.18 | b | 27.19 | 47.99 | |||||||
2007 | 18.66 | 32.08 | c | 38.73 | c | 47.22 | a | 54.27 | c | 64.52 | f | 76.62 | b | 72.39 | d | 60.90 | f | 47.85 | h | 38.45 | k | 30.23 | p | 48.57 | e | |
2008 | 15.73 | g | 24.00 | c | 32.70 | a | 40.70 | 52.41 | b | 62.04 | b | 73.27 | c | 70.38 | a | 59.87 | 48.40 | 39.47 | 25.94 | e | 48.11 | a | ||||
2009 | 23.42 | 24.34 | 33.98 | a | 45.64 | a | 56.75 | a | 62.41 | g | 71.36 | b | 67.84 | 64.20 | 43.13 | 35.88 | 17.42 | 44.00 | a | |||||||
2010 | 20.68 | 24.43 | 36.77 | 44.91 | a | 48.42 | 62.17 | a | 73.22 | a | 70.39 | 60.93 | 51.66 | 34.77 | 28.77 | a | 46.43 | |||||||||
2011 | 21.09 | b | 27.64 | 36.11 | 42.12 | 50.11 | 61.72 | 72.34 | 72.98 | 64.12 | 50.50 | 33.93 | 23.24 | 46.33 | ||||||||||||
2012 | 28.80 | a | 32.00 | 42.10 | 50.88 | f | 55.78 | b | 64.84 | a | 74.40 | 72.89 | 63.09 | a | 49.02 | a | 40.23 | 28.08 | 50.11 | a | ||||||
2013 | 10.39 | 19.79 | 36.45 | 45.12 | 55.33 | b | 66.73 | 75.16 | 72.77 | 62.95 | 46.18 | 38.12 | d | 18.29 | 45.61 | |||||||||||
2014 | 21.18 | 33.64 | 41.47 | 45.17 | 56.45 | 62.75 | 73.85 | 67.68 | 63.30 | 51.23 | 35.48 | 32.92 | 48.76 | |||||||||||||
2015 | 27.58 | 38.39 | 43.55 | 47.07 | 54.74 | 69.70 | 69.53 | 71.47 | 65.37 | 57.24 | l | 35.78 | 24.02 | 49.75 | a | |||||||||||
2016 | 22.24 | 26.83 | 42.24 | 50.65 | 54.77 | 68.32 | 72.75 | i | 64.88 | w | 60.42 | 51.13 | 41.07 | 24.15 | 44.18 | b | ||||||||||
2017 | 16.56 | 32.21 | 43.53 | 45.08 | 54.82 | 66.22 | 74.94 | 70.61 | 59.77 | 44.98 | 40.23 | 23.68 | 47.72 | |||||||||||||
2018 | 28.60 | 31.25 | 35.68 | 48.02 | 57.71 | 64.87 | 74.35 | 70.27 | 62.18 | 48.47 | 34.37 | 23.45 | 48.27 | |||||||||||||
2019 | 22.90 | 27.48 | 37.76 | 48.15 | 52.90 | 62.42 | 72.21 | 70.31 | 59.87 | 40.02 | 36.50 | 22.55 | 46.09 | |||||||||||||
2020 | 27.29 | 24.72 | 39.90 | 45.63 | 56.61 | 62.75 | 70.52 | 73.66 | 60.32 | 48.16 | 37.08 | 23.05 | 47.48 | |||||||||||||
2021 | 24.85 | 31.62 | 38.37 | 45.28 | 56.08 | 71.42 | 76.89 | 68.39 | 61.98 | 47.76 | 40.02 | 29.60 | 49.36 | |||||||||||||
2022 | 20.76 | 24.00 | 38.47 | 42.87 | 51.32 | 62.78 | 74.44 | 71.47 | 64.23 | 48.16 | 30.57 | 23.74 | 46.07 | |||||||||||||
2023 | 22.82 | 16.48 | 27.77 | 39.80 | 58.92 | 61.13 | 73.69 | 70.66 | 60.52 | 48.48 | 35.81 | a | 28.78 | a | 45.41 | |||||||||||
2024 | 25.94 | 31.66 | 40.24 | 47.52 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.61 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 22.31 | 27.13 | 37.25 | 45.94 | 55.09 | 63.87 | 72.21 | 70.19 | 60.47 | 48.29 | 35.78 | 24.81 | 46.96 | |||||||||||||
S.D. | 5.85 | 6.20 | 4.50 | 2.82 | 2.91 | 2.79 | 2.37 | 2.26 | 2.79 | 2.79 | 3.19 | 4.53 | 1.37 | |||||||||||||
SKEW | -0.12 | -0.34 | -1.07 | -0.08 | 0.08 | 0.35 | -1.05 | -0.22 | -0.19 | -0.26 | -0.51 | 0.02 | -0.43 | |||||||||||||
MAX | 34.24 | 39.56 | 44.84 | 52.31 | 62.44 | 71.42 | 76.89 | 73.82 | 65.37 | 54.95 | 41.62 | 33.45 | 49.36 | |||||||||||||
MIN | 10.27 | 12.05 | 24.29 | 39.06 | 48.42 | 57.98 | 62.50 | 65.80 | 53.55 | 40.02 | 27.88 | 15.31 | 43.17 | |||||||||||||
YRS | 63 | 65 | 66 | 62 | 64 | 63 | 62 | 65 | 65 | 63 | 64 | 65 | 49 |