YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.32 | 36.25 | 31.90 | e | 40.83 | i | ||
1956 | 28.83 | d | 27.77 | c | 39.21 | e | 47.57 | b | 62.41 | d | 75.30 | 74.55 | b | 72.44 | 66.67 | x | 55.32 | 35.54 | b | 33.39 | c | 50.21 | a | |||
1957 | 23.92 | f | 40.70 | a | 39.18 | a | 45.44 | c | 56.95 | b | 66.32 | 74.05 | 71.47 | a | 63.00 | a | 52.42 | 34.93 | a | 37.89 | q | 54.45 | b | |||
1958 | 31.24 | 30.42 | o | 42.17 | y | 47.55 | 63.18 | a | 71.15 | 73.66 | b | 74.10 | 67.28 | a | 55.08 | f | 43.94 | n | 34.86 | c | 57.88 | d | ||||
1959 | 28.68 | 32.33 | a | 39.58 | f | 49.66 | a | 61.47 | a | 72.02 | 73.82 | 74.18 | a | 62.55 | b | 49.42 | 38.60 | ----- | z | 54.27 | b | |||||
1960 | ----- | z | 17.47 | k | 35.82 | a | 51.36 | a | 58.27 | 69.42 | 71.18 | c | 73.53 | 65.25 | b | 52.71 | 39.98 | 29.13 | a | 54.67 | b | |||||
1961 | 29.28 | b | 35.08 | b | 40.81 | b | 47.55 | a | 59.43 | c | 67.35 | 71.30 | a | 71.90 | 59.20 | c | 51.40 | b | 37.80 | b | 25.08 | 49.68 | ||||
1962 | 22.82 | 33.69 | d | 36.41 | b | 51.25 | 62.09 | b | 68.00 | 72.83 | a | 73.59 | c | 63.32 | 54.31 | 41.67 | d | 30.65 | n | 52.73 | a | |||||
1963 | 19.44 | 39.26 | c | 39.94 | 52.38 | 61.77 | 70.62 | 77.12 | a | 72.48 | a | 68.39 | b | 59.14 | b | 41.88 | 29.33 | e | 52.65 | |||||||
1964 | 30.45 | 28.95 | a | ----- | z | ----- | z | 60.68 | c | 71.32 | k | 78.22 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.57 | h | |
1965 | ----- | z | 31.24 | e | 31.08 | 53.37 | 60.41 | b | 66.75 | 74.65 | 69.82 | a | 59.50 | 55.02 | 44.90 | 35.81 | 52.96 | a | ||||||||
1966 | 24.53 | 28.32 | 43.84 | 49.45 | 61.85 | a | 70.08 | 78.39 | 70.47 | 65.78 | 52.74 | 42.80 | 29.16 | 51.45 | ||||||||||||
1967 | 34.52 | 35.95 | 45.55 | b | 53.56 | c | 57.71 | 67.50 | 74.21 | 70.10 | a | 63.28 | a | 54.48 | 40.03 | 25.97 | 51.90 | |||||||||
1968 | 31.00 | 35.52 | 42.15 | 47.03 | 57.45 | 71.77 | 74.21 | 70.97 | 64.42 | 54.82 | 37.25 | 29.66 | 51.35 | |||||||||||||
1969 | 34.23 | 35.23 | 32.35 | 54.24 | a | 61.39 | 65.92 | 76.85 | a | 75.61 | 66.47 | 44.82 | 39.28 | 33.53 | 51.66 | |||||||||||
1970 | 28.94 | 38.46 | 35.08 | 46.94 | d | 61.57 | a | 68.68 | b | 76.07 | a | 76.05 | 63.37 | 47.50 | 40.85 | 34.45 | 51.50 | |||||||||
1971 | 30.47 | 33.27 | 41.00 | 50.47 | a | 57.45 | 72.38 | a | 73.68 | 72.40 | 61.50 | b | 52.27 | 40.22 | a | 32.61 | 51.48 | |||||||||
1972 | 30.05 | 38.09 | 46.45 | c | 53.15 | 59.55 | 71.42 | 74.06 | 72.45 | 64.38 | 52.83 | b | 31.03 | 23.61 | 51.42 | |||||||||||
1973 | 28.19 | 35.12 | 40.15 | 44.66 | a | 57.82 | 68.33 | 72.50 | 73.50 | 61.45 | 55.61 | 40.70 | 32.58 | 50.88 | ||||||||||||
1974 | 25.77 | 36.16 | 44.95 | 50.00 | 63.52 | a | 70.16 | a | 75.95 | a | 70.45 | 61.37 | 55.18 | 39.82 | 28.98 | 51.86 | ||||||||||
1975 | 29.31 | 32.18 | 38.95 | a | 48.68 | 58.31 | b | 68.98 | 75.11 | 74.38 | a | 63.05 | 54.45 | 37.32 | 36.13 | a | 51.40 | |||||||||
1976 | 31.10 | 40.00 | 40.29 | 51.31 | a | 59.35 | 69.72 | 75.21 | 72.39 | 63.77 | 48.71 | 37.29 | a | 33.06 | 51.85 | |||||||||||
1977 | 26.90 | 37.68 | 40.85 | a | 51.97 | 62.65 | 72.60 | 75.89 | 72.32 | a | 67.70 | 53.71 | 40.97 | 34.87 | 53.17 | |||||||||||
1978 | 24.29 | 27.50 | 43.74 | 53.29 | a | 57.84 | 70.53 | 77.47 | 71.82 | 66.70 | 54.60 | 39.30 | 24.65 | 50.98 | ||||||||||||
1979 | 16.45 | a | 32.38 | 42.55 | a | 50.67 | a | 56.47 | a | 68.22 | a | 74.63 | 70.65 | 66.67 | 55.55 | 33.90 | 34.56 | 50.22 | ||||||||
1980 | 26.61 | 35.86 | a | 38.52 | 46.28 | 56.27 | 72.03 | 78.60 | 74.57 | a | 65.45 | 51.26 | 40.43 | 39.77 | 52.14 | |||||||||||
1981 | 34.63 | 34.89 | 42.34 | 57.17 | 58.92 | 74.17 | 75.50 | 71.47 | 67.07 | 53.90 | 44.95 | 33.56 | 54.05 | |||||||||||||
1982 | 29.69 | 29.98 | 42.95 | 50.97 | 58.35 | 65.55 | 74.84 | 73.60 | a | 65.07 | 50.71 | 37.67 | 31.83 | a | 50.93 | |||||||||||
1983 | 32.61 | 36.34 | 39.39 | 44.33 | 55.32 | 66.77 | 77.35 | 76.93 | b | 68.35 | 54.35 | 40.68 | 21.37 | a | 51.15 | |||||||||||
1984 | 26.31 | 35.10 | 37.88 | a | 45.68 | 61.58 | 70.12 | 75.05 | a | 73.02 | 63.15 | 48.28 | a | 40.38 | a | 33.94 | 50.87 | |||||||||
1985 | 24.65 | 28.36 | 42.02 | 52.80 | 60.89 | 70.13 | 74.37 | 73.71 | 62.70 | 52.13 | 32.28 | 27.40 | 50.12 | |||||||||||||
1986 | 40.28 | a | 37.15 | a | 48.10 | 53.38 | 60.06 | 70.93 | 75.85 | 72.00 | 63.27 | 52.03 | a | 39.23 | 30.84 | 53.59 | ||||||||||
1987 | 30.63 | 37.11 | 38.94 | 52.03 | 60.48 | 70.68 | 75.84 | 71.84 | 63.85 | 52.84 | 39.77 | 29.08 | 51.92 | |||||||||||||
1988 | 19.44 | 32.22 | 41.59 | b | 50.35 | 59.98 | 71.58 | 74.85 | 74.98 | 64.45 | 54.55 | 41.25 | 31.35 | 51.38 | ||||||||||||
1989 | 32.63 | 26.00 | a | 46.21 | 53.32 | 62.74 | 64.45 | j | 74.93 | b | 72.09 | b | 62.91 | c | 52.47 | a | 42.00 | i | 26.85 | 51.01 | b | |||||
1990 | 32.55 | 33.04 | 41.71 | 51.18 | 56.81 | 73.96 | g | 71.76 | 71.70 | f | 68.08 | 53.14 | f | 44.04 | d | 25.61 | 47.20 | c | ||||||||
1991 | 27.76 | 38.52 | 41.93 | a | 50.60 | 62.71 | 71.90 | 73.52 | 71.71 | 63.92 | 52.48 | 34.67 | 31.37 | 51.76 | ||||||||||||
1992 | 31.81 | 38.48 | 44.87 | 53.95 | 62.40 | a | 62.07 | p | 72.64 | b | 69.56 | 65.37 | 53.56 | 33.33 | 28.16 | 50.38 | a | |||||||||
1993 | 25.85 | a | 30.79 | 42.73 | 50.62 | 59.11 | 69.78 | a | 74.74 | 70.90 | 61.67 | 50.53 | 33.35 | 32.74 | 50.23 | |||||||||||
1994 | 31.42 | a | 32.30 | 45.40 | 49.98 | 61.69 | 73.17 | i | 73.42 | 74.03 | 65.82 | 52.11 | h | 39.33 | 34.81 | 50.82 | b | |||||||||
1995 | 32.97 | 38.55 | 41.56 | 42.73 | h | 54.48 | 65.35 | 71.90 | 76.12 | a | 63.03 | 50.92 | 43.18 | 33.31 | 51.94 | a | ||||||||||
1996 | 29.02 | 36.12 | 39.24 | 51.68 | 65.10 | 70.48 | a | 73.67 | d | 71.90 | 63.70 | h | 53.10 | e | 39.84 | a | 34.02 | 51.29 | a | |||||||
1997 | 29.90 | a | 32.24 | a | 44.92 | a | 45.65 | 59.18 | 69.47 | 76.07 | b | 71.60 | 67.13 | c | 53.27 | a | 36.33 | 30.18 | 51.33 | |||||||
1998 | 33.13 | 35.21 | 38.45 | c | 48.64 | e | 63.28 | a | 68.00 | 76.06 | 71.68 | 68.53 | 53.13 | ----- | z | ----- | z | 55.61 | b | |||||||
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.32 | 75.68 | 67.17 | a | 53.65 | 32.50 | 30.02 | d | 55.89 | f | ||||
2001 | 29.18 | 33.84 | 40.68 | 53.87 | 59.78 | a | 71.45 | 78.35 | 74.60 | 65.78 | 54.00 | d | 43.62 | 32.69 | 53.15 | |||||||||||
2002 | 31.37 | 33.85 | a | 38.77 | c | 55.10 | 60.68 | 74.77 | 77.82 | a | 75.66 | 66.27 | 48.55 | 39.36 | a | 33.00 | 52.93 | |||||||||
2003 | 36.26 | 31.32 | 43.73 | 54.53 | 62.58 | 66.79 | a | 81.05 | 75.97 | a | 63.62 | 58.37 | a | 42.41 | a | 36.02 | 54.39 | |||||||||
2004 | 34.33 | b | 34.40 | c | 49.87 | d | 52.55 | b | 64.61 | 68.68 | 73.90 | 70.90 | 67.23 | 55.50 | c | 39.86 | b | 34.79 | b | 53.89 | ||||||
2005 | 35.84 | b | 38.29 | 42.55 | 52.12 | a | 62.80 | a | 71.82 | 79.48 | 74.85 | 69.45 | 56.44 | 46.55 | 32.19 | b | 55.20 | |||||||||
2006 | 38.44 | d | 34.19 | a | 42.89 | d | 56.26 | c | 63.71 | 74.61 | b | 77.98 | 73.44 | 60.43 | 52.19 | 42.64 | a | 31.68 | a | 54.04 | ||||||
2007 | 23.87 | a | 32.64 | 47.62 | a | 49.60 | 60.93 | a | 70.18 | 76.05 | 76.77 | 68.78 | 56.85 | a | 44.74 | a | 33.18 | a | 53.44 | |||||||
2008 | 33.62 | a | 37.50 | 45.08 | a | 51.50 | a | 61.70 | a | 71.80 | 77.06 | d | 72.90 | 65.85 | 55.38 | a | 45.22 | 35.94 | 54.46 | |||||||
2009 | 36.97 | 39.66 | 44.87 | a | 52.35 | 63.37 | 69.23 | 74.34 | 72.05 | 64.90 | a | 49.32 | 45.03 | 26.34 | 53.20 | |||||||||||
2010 | 31.16 | 29.14 | 41.66 | 50.93 | 58.74 | 72.53 | 76.85 | 74.69 | 69.43 | 55.06 | 39.85 | 34.37 | 52.87 | |||||||||||||
2011 | 28.52 | 30.45 | 44.60 | 51.95 | b | 58.57 | a | 73.87 | 78.77 | a | 77.84 | 65.92 | 53.63 | 40.87 | 26.06 | 52.59 | ||||||||||
2012 | 35.05 | 32.70 | a | 48.66 | 55.73 | 63.47 | 76.41 | c | 79.19 | 74.92 | 66.77 | 51.53 | 44.32 | 30.95 | 54.97 | |||||||||||
2013 | 29.71 | 31.73 | 41.40 | 46.09 | a | 60.87 | 74.37 | 74.82 | 74.24 | 69.62 | a | 51.21 | 39.87 | 30.10 | 52.00 | |||||||||||
2014 | 30.90 | 30.54 | 42.11 | 51.63 | 60.10 | 72.07 | 73.92 | 72.35 | 66.68 | 55.53 | 36.38 | 30.92 | 51.93 | |||||||||||||
2015 | 32.61 | 35.23 | 45.90 | 52.37 | 56.84 | 72.13 | 75.53 | 75.48 | 70.67 | 57.58 | 39.55 | 31.92 | 53.82 | |||||||||||||
2016 | 31.50 | 37.31 | 44.69 | 50.77 | 57.85 | 72.77 | 76.61 | 71.69 | 68.20 | 58.29 | 44.28 | 28.79 | 53.56 | |||||||||||||
2017 | 29.65 | 41.07 | 48.03 | 51.92 | 58.13 | 71.13 | 75.56 | 70.00 | 65.32 | 53.34 | 45.00 | 32.03 | 53.43 | |||||||||||||
2018 | 33.68 | 32.21 | 44.90 | 50.83 | 66.08 | 75.03 | 76.37 | 71.52 | 68.18 | 50.24 | 37.08 | 30.90 | 53.09 | |||||||||||||
2019 | 31.23 | 30.55 | 38.68 | 51.98 | 55.10 | 67.68 | 76.11 | 76.08 | 71.65 | 45.85 | 37.23 | 31.76 | 51.16 | |||||||||||||
2020 | 32.32 | 29.93 | 44.56 | 49.23 | 62.93 | a | 73.47 | 75.98 | 76.42 | 64.25 | 50.42 | 42.95 | 30.06 | 52.71 | ||||||||||||
2021 | 29.31 | 24.54 | 41.24 | 48.45 | 57.76 | 70.95 | 76.00 | 74.95 | 68.82 | 53.66 | 43.58 | 38.10 | 52.28 | |||||||||||||
2022 | 31.13 | 27.96 | a | 44.45 | i | 51.16 | a | 61.32 | 72.02 | 77.87 | 74.32 | 68.87 | 53.53 | 36.97 | 29.10 | 53.11 | a | |||||||||
2023 | 29.31 | 33.16 | 39.05 | 49.97 | 61.61 | 66.97 | a | 75.97 | 75.93 | a | 68.47 | 53.60 | 42.45 | 34.73 | 52.60 | |||||||||||
2024 | 28.19 | 38.81 | 43.50 | 51.63 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.83 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.04 | 33.91 | 41.97 | 50.80 | 60.28 | 70.51 | 75.50 | 73.26 | 65.48 | 53.04 | 39.77 | 31.35 | 52.29 | |||||||||||||
S.D. | 4.32 | 3.81 | 3.69 | 2.85 | 2.57 | 2.61 | 2.03 | 2.02 | 2.75 | 2.80 | 3.62 | 3.57 | 1.31 | |||||||||||||
SKEW | -0.63 | -0.22 | -0.44 | -0.32 | -0.14 | 0.01 | 0.18 | 0.19 | -0.11 | -0.53 | -0.36 | -0.43 | 0.24 | |||||||||||||
MAX | 40.28 | 41.07 | 49.87 | 57.17 | 66.08 | 76.41 | 81.05 | 77.84 | 71.65 | 59.14 | 46.55 | 39.77 | 55.20 | |||||||||||||
MIN | 16.45 | 24.54 | 31.08 | 44.33 | 54.48 | 65.35 | 71.18 | 69.56 | 59.20 | 44.82 | 31.03 | 21.37 | 49.68 | |||||||||||||
YRS | 64 | 65 | 63 | 64 | 66 | 61 | 67 | 65 | 64 | 64 | 64 | 63 | 50 |