YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1956 | ----- | z | ----- | z | ----- | z | 44.37 | k | 53.73 | 62.33 | 67.10 | 62.52 | 58.38 | 47.24 | 28.38 | 25.06 | 50.59 | d | ||||||||
1957 | 11.11 | 28.79 | 32.34 | 40.03 | 53.13 | 58.70 | 68.48 | d | 66.50 | 56.69 | f | 45.28 | a | 28.55 | a | 29.09 | d | 42.00 | a | |||||||
1958 | 26.50 | 34.57 | 31.85 | 41.23 | 58.21 | 60.67 | 63.00 | 68.03 | 57.27 | 48.82 | 32.29 | a | 29.35 | 45.98 | ||||||||||||
1959 | 24.79 | 21.46 | 32.55 | 41.67 | a | 46.95 | 62.83 | 67.44 | 65.21 | 55.48 | 45.70 | i | 31.38 | 27.77 | 43.41 | a | ||||||||||
1960 | 24.39 | 19.33 | ----- | z | ----- | z | ----- | z | 62.73 | q | 72.19 | 65.18 | a | 59.45 | 46.28 | h | 33.50 | 26.67 | a | 42.96 | e | |||||
1961 | 27.05 | 37.18 | q | ----- | z | 41.22 | g | 53.31 | 66.35 | 69.38 | a | 69.73 | 50.08 | 44.33 | a | 32.65 | 22.68 | 48.40 | c | |||||||
1962 | 13.73 | a | 25.84 | 31.24 | 46.08 | 51.76 | 60.02 | 64.79 | 64.40 | 57.40 | 51.95 | a | 38.03 | 30.05 | a | 44.61 | ||||||||||
1963 | 12.35 | 34.73 | 36.52 | a | 41.46 | d | 53.39 | 58.88 | 68.28 | a | 68.13 | d | 62.03 | l | 51.81 | e | 35.69 | f | 23.57 | a | 44.91 | b | ||||
1964 | 22.13 | d | 21.81 | c | 25.95 | 41.73 | 52.20 | c | 57.35 | 70.07 | a | 63.12 | a | 55.95 | b | 50.29 | 32.80 | 25.24 | 43.22 | |||||||
1965 | 27.47 | 26.18 | 22.79 | 44.12 | 49.10 | a | 58.83 | 66.31 | 64.42 | 47.29 | a | 49.87 | a | 37.22 | 27.82 | 43.45 | ||||||||||
1966 | 24.16 | b | 24.98 | a | 34.92 | 40.14 | a | 55.03 | 58.40 | 71.69 | 65.21 | 60.52 | 44.98 | 33.84 | a | 23.69 | 44.80 | |||||||||
1967 | 26.71 | 27.28 | a | 31.63 | a | 37.90 | 49.52 | 57.77 | 68.42 | 68.55 | 62.15 | 46.32 | c | 33.68 | 16.03 | b | 43.83 | |||||||||
1968 | 19.76 | 29.24 | b | 38.35 | 38.88 | 48.66 | 58.62 | 67.98 | 62.08 | 56.65 | 47.81 | 31.16 | e | 22.98 | 43.51 | |||||||||||
1969 | 23.89 | 28.04 | 30.89 | 47.69 | d | 55.06 | 57.08 | 67.60 | 71.11 | 61.08 | 39.38 | b | 34.54 | b | 26.23 | c | 45.22 | |||||||||
1970 | 25.08 | 33.25 | 30.17 | a | 36.07 | a | 52.82 | 62.00 | a | 69.68 | 70.65 | 52.48 | 42.22 | d | 33.02 | d | 23.76 | b | 44.27 | |||||||
1971 | 23.43 | a | 28.85 | b | 31.18 | c | 42.05 | 51.52 | a | 60.47 | 66.00 | 72.26 | 52.20 | c | 44.02 | 33.23 | 22.37 | e | 43.96 | |||||||
1972 | 22.76 | d | 30.45 | g | 40.63 | d | 43.40 | f | 51.23 | e | 62.02 | g | 65.19 | b | 67.63 | 53.16 | b | 45.64 | f | 32.46 | b | 16.81 | e | 43.73 | d | |
1973 | 21.92 | f | 30.09 | e | 35.15 | d | 39.48 | c | 51.04 | d | 63.07 | g | ----- | z | 68.85 | 55.52 | 48.02 | a | 32.93 | 27.55 | 43.18 | c | ||||
1974 | 22.32 | 29.30 | a | 32.62 | c | 45.03 | 49.03 | 64.17 | 71.23 | 63.66 | 57.03 | 48.68 | 35.13 | 23.61 | 45.15 | |||||||||||
1975 | 21.52 | 25.83 | a | 30.39 | 33.58 | 47.58 | a | 56.17 | 69.90 | 63.23 | 56.20 | 45.55 | 30.53 | a | 27.50 | a | 42.33 | |||||||||
1976 | 24.76 | 25.82 | d | 28.07 | k | 43.10 | j | 55.53 | l | 58.54 | g | 70.27 | a | 65.64 | b | 58.13 | c | 43.72 | d | 34.27 | d | 22.90 | a | 43.19 | d | |
1977 | 16.32 | 29.13 | b | 30.65 | 46.84 | a | 49.68 | 64.30 | 67.19 | b | 64.40 | 56.92 | 50.57 | i | 33.66 | b | 24.66 | b | 43.98 | a | ||||||
1978 | 23.38 | a | 24.43 | a | 37.86 | c | 44.05 | 50.00 | 60.52 | a | 68.02 | 64.74 | ----- | z | 50.84 | c | 24.46 | d | 14.83 | a | 42.10 | a | ||||
1979 | 9.68 | c | 25.73 | b | 34.78 | f | 42.47 | a | 51.47 | b | 61.57 | b | 68.58 | 66.52 | b | 62.57 | a | 50.50 | l | 27.18 | e | 30.12 | a | 44.59 | b | |
1980 | 20.03 | n | 33.80 | n | 30.53 | o | 44.56 | l | 53.02 | d | ----- | z | 68.28 | b | 62.97 | 57.72 | c | 49.13 | h | 34.18 | h | 30.98 | 54.59 | g | ||
1981 | 32.98 | c | 29.82 | 38.39 | 44.20 | b | 52.66 | c | 57.98 | f | 67.32 | 68.69 | 60.67 | 43.04 | e | 37.79 | a | 26.98 | a | 45.69 | a | |||||
1982 | 19.85 | d | 23.76 | e | 32.87 | e | 36.96 | c | 50.30 | h | 56.30 | c | 65.22 | b | 68.39 | 54.77 | 42.84 | c | 27.59 | g | 23.41 | d | 42.44 | b | ||
1983 | 29.62 | c | 35.41 | e | 38.93 | b | 40.02 | a | 48.37 | e | 59.45 | b | 67.09 | c | 69.29 | c | 56.29 | b | 49.08 | a | 33.58 | 19.16 | i | 47.92 | a | |
1984 | 22.89 | c | 30.33 | c | 35.53 | b | 40.64 | b | 53.65 | d | ----- | z | 68.33 | d | 68.42 | a | 53.52 | ----- | z | ----- | z | ----- | z | 46.66 | d | |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.26 | 25.26 | k | |
1987 | 23.12 | a | 31.91 | 37.83 | b | 52.11 | b | 58.03 | a | 64.60 | a | 67.10 | b | 64.66 | ----- | z | 49.60 | a | ----- | z | 26.64 | b | 47.56 | b | ||
1988 | 20.15 | a | 29.69 | 35.13 | a | 48.62 | b | 56.76 | 70.41 | a | 73.25 | a | 69.90 | 58.44 | e | 52.61 | 32.83 | c | 23.87 | a | 47.64 | |||||
1989 | 23.48 | f | 16.96 | e | 37.02 | e | 46.24 | a | 53.07 | b | 62.05 | a | 73.88 | b | 66.98 | 59.00 | a | 46.79 | 34.50 | a | 22.12 | f | 49.65 | b | ||
1990 | 26.10 | b | 26.56 | b | 38.15 | a | 47.58 | 50.97 | b | 62.23 | 69.79 | c | 69.50 | d | 64.17 | a | 46.58 | 36.59 | a | 13.74 | h | 48.93 | a | |||
1991 | ----- | z | ----- | z | 34.69 | 41.30 | 50.53 | a | 61.24 | c | 70.88 | b | 71.20 | a | 58.13 | 43.16 | c | 28.36 | b | 26.19 | b | 48.57 | b | |||
1992 | 26.93 | b | 35.81 | b | 43.10 | 48.21 | a | 57.89 | d | 62.69 | c | 64.03 | a | 67.18 | 58.75 | d | 50.12 | a | 30.43 | b | 21.28 | b | 47.20 | |||
1993 | 21.76 | 22.87 | b | 39.11 | c | 43.52 | a | 55.56 | g | 57.31 | c | 60.31 | g | 63.27 | e | 56.46 | f | 46.35 | d | 27.18 | e | 26.33 | e | 38.63 | c | |
1994 | 31.06 | e | 24.34 | c | 39.60 | g | 47.78 | g | 57.30 | f | 62.09 | h | 68.18 | c | 69.76 | d | 62.59 | c | 45.22 | d | 28.27 | 28.88 | a | 44.79 | d | |
1995 | 27.23 | 33.76 | c | 34.70 | a | 41.82 | b | 51.56 | g | 59.54 | f | 67.00 | n | 68.55 | b | 58.36 | b | 43.05 | a | 37.91 | a | 28.07 | c | 41.49 | c | |
1996 | 21.39 | 26.79 | 30.65 | 44.57 | a | 48.47 | a | 63.18 | e | 70.12 | b | 69.68 | a | 57.29 | b | 46.88 | e | 35.10 | d | 26.02 | h | 46.74 | a | |||
1997 | 21.45 | c | 27.38 | c | 36.88 | a | 41.20 | e | 54.90 | b | 64.09 | b | 68.05 | b | 67.52 | a | 60.39 | c | 46.40 | 35.88 | b | 24.61 | 45.73 | |||
1998 | 27.29 | 31.55 | 36.79 | 45.67 | 54.93 | a | 55.29 | a | 71.20 | a | 71.15 | 63.67 | 47.68 | a | 37.74 | a | 24.00 | c | 47.25 | |||||||
1999 | 28.00 | 30.59 | 37.42 | 41.92 | 51.27 | a | 59.50 | c | 69.03 | b | 69.32 | a | 56.70 | 50.20 | c | 43.68 | 26.45 | a | 47.01 | |||||||
2000 | 26.97 | b | 33.87 | c | 37.98 | b | 48.21 | a | 54.12 | c | 62.97 | a | 71.95 | b | 70.52 | c | 56.88 | b | 47.32 | 25.75 | 24.19 | b | 46.73 | |||
2001 | 24.20 | c | 25.62 | 37.71 | 44.35 | c | 56.16 | c | 63.77 | b | 71.19 | 72.15 | 63.69 | a | 47.59 | b | 39.75 | b | 23.54 | f | 49.65 | a | ||||
2002 | 24.45 | c | 27.12 | d | 27.21 | b | 40.46 | f | 51.62 | c | 61.54 | f | 73.29 | b | 65.59 | b | 60.37 | 41.16 | b | 32.70 | 31.18 | c | 43.47 | b | ||
2003 | 31.40 | 24.54 | b | 37.41 | c | 46.02 | c | 54.38 | a | 61.17 | 75.13 | a | 73.17 | a | 57.38 | b | 52.47 | b | 28.57 | 29.26 | d | 47.57 | ||||
2004 | 25.58 | 29.35 | c | 42.42 | a | 47.32 | 51.61 | 60.23 | b | 69.32 | 65.26 | 57.79 | d | 47.65 | a | 35.12 | a | 31.42 | a | 46.92 | ||||||
2005 | 26.00 | 30.27 | 37.08 | 45.05 | 52.30 | a | 59.26 | c | 71.00 | 67.43 | d | 59.29 | a | 50.24 | 33.95 | a | 21.62 | a | 46.12 | |||||||
2006 | 29.69 | b | 26.37 | a | 35.10 | 47.10 | 55.20 | a | 65.22 | a | 73.85 | 68.60 | 58.82 | b | 45.02 | 34.80 | 26.48 | 47.19 | ||||||||
2007 | 19.26 | b | 29.46 | a | 42.23 | a | 38.62 | v | 54.12 | o | 65.42 | 76.45 | 69.31 | 60.45 | 46.66 | 34.45 | 23.47 | a | 46.72 | b | ||||||
2008 | 19.46 | d | 29.17 | 32.11 | 39.43 | a | 49.74 | 59.62 | a | 70.77 | a | 69.66 | b | 57.81 | c | 47.20 | c | 38.95 | 19.70 | a | 44.47 | |||||
2009 | 25.13 | a | 30.89 | a | 34.27 | 42.18 | 53.60 | 58.34 | b | 66.32 | c | 67.12 | c | 63.03 | a | 37.88 | b | 35.21 | b | 20.78 | b | 44.56 | ||||
2010 | 27.47 | a | 29.16 | 38.93 | b | 42.50 | d | 47.27 | 59.54 | c | 67.79 | c | 66.42 | f | 60.43 | a | 51.44 | d | 30.16 | a | 27.20 | c | 43.81 | a | ||
2011 | 24.87 | 20.69 | a | 36.66 | 40.37 | 47.85 | 59.07 | 70.81 | 70.02 | 62.48 | 49.29 | 32.22 | 24.58 | 44.91 | ||||||||||||
2012 | 28.63 | 26.86 | 40.21 | 48.27 | 51.91 | b | 63.35 | 73.03 | 70.77 | a | 61.92 | 45.61 | 37.04 | e | 26.56 | 47.85 | ||||||||||
2013 | 22.95 | 27.50 | 35.73 | 40.50 | 53.65 | a | 63.10 | 72.00 | 71.20 | a | 60.92 | 43.11 | 37.73 | h | 21.92 | e | 46.60 | a | ||||||||
2014 | 22.58 | r | 20.60 | h | 36.00 | f | 44.40 | f | 54.70 | d | 59.35 | d | 71.52 | 65.85 | d | 60.92 | 50.47 | 30.53 | a | 28.86 | b | 52.77 | d | |||
2015 | 29.68 | a | 34.13 | a | 43.05 | 46.59 | c | 51.82 | a | 67.32 | 70.39 | i | 69.05 | a | 62.42 | 56.69 | d | 27.21 | a | 25.02 | c | 46.63 | a | |||
2016 | 25.88 | c | 35.48 | c | 37.00 | c | 49.95 | i | 50.18 | 66.52 | a | 69.06 | 68.40 | 61.10 | 47.00 | 37.68 | 16.73 | 46.82 | a | |||||||
2017 | 17.98 | 30.68 | 42.39 | 45.58 | 54.55 | 64.10 | a | 72.53 | 68.24 | 56.62 | 43.79 | 34.70 | 23.68 | a | 46.24 | |||||||||||
2018 | 28.42 | 22.50 | a | 36.27 | 43.02 | 55.98 | 60.62 | 70.37 | 66.44 | 57.62 | 45.55 | 29.98 | a | 26.65 | h | 46.98 | a | |||||||||
2019 | 27.95 | a | 13.96 | 29.60 | b | 45.32 | 52.80 | a | 60.92 | l | 70.92 | y | 69.80 | a | 63.45 | i | 38.03 | a | 38.85 | f | ----- | z | 39.64 | e | ||
2020 | ----- | z | ----- | z | ----- | z | ----- | z | 50.43 | a | 58.27 | h | 68.82 | l | 71.27 | p | 60.27 | q | 53.40 | u | ----- | z | 28.96 | r | 50.43 | k |
2021 | ----- | z | 15.41 | k | 29.56 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.91 | 27.85 | 35.34 | 43.27 | 52.30 | 61.26 | 69.42 | 67.65 | 58.33 | 46.82 | 33.16 | 25.02 | 45.47 | |||||||||||||
S.D. | 4.85 | 4.60 | 4.34 | 3.66 | 2.77 | 3.16 | 2.78 | 2.72 | 3.42 | 3.70 | 3.79 | 3.73 | 1.57 | |||||||||||||
SKEW | -0.95 | -0.55 | -0.44 | -0.16 | 0.10 | 0.46 | 0.12 | -0.22 | -0.72 | -0.15 | 0.01 | -0.67 | -0.12 | |||||||||||||
MAX | 32.98 | 35.81 | 43.10 | 52.11 | 58.21 | 70.41 | 76.45 | 73.17 | 64.17 | 56.69 | 43.68 | 31.42 | 47.85 | |||||||||||||
MIN | 9.68 | 13.96 | 22.79 | 33.58 | 46.95 | 55.29 | 63.00 | 62.08 | 47.29 | 37.88 | 24.46 | 14.83 | 42.33 | |||||||||||||
YRS | 56 | 56 | 54 | 51 | 56 | 51 | 57 | 61 | 56 | 55 | 55 | 55 | 27 |