YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.85 | a | 70.97 | a | 65.28 | 47.05 | a | 30.67 | a | 15.58 | 50.23 | f | ||
1949 | 6.23 | a | 5.57 | 26.02 | 47.57 | a | 56.57 | a | 66.33 | a | 72.40 | 73.42 | 57.52 | a | 47.26 | 37.85 | 11.87 | 42.38 | ||||||||
1950 | -6.39 | 10.20 | 23.23 | 35.40 | 52.41 | b | 67.02 | 68.79 | b | 66.85 | 60.57 | a | 47.85 | g | ----- | z | ----- | z | 42.01 | c | ||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.11 | 56.40 | 50.16 | 34.98 | 19.27 | 46.19 | g | |||||
1963 | 3.76 | 15.32 | 35.58 | 45.28 | 55.31 | 68.62 | 71.88 | a | 69.53 | 61.82 | 56.52 | 35.28 | 9.39 | 44.02 | ||||||||||||
1964 | 16.42 | 22.67 | 22.29 | 45.73 | 58.50 | 64.23 | 72.90 | 66.23 | 56.68 | 48.42 | 28.30 | 5.68 | 42.34 | |||||||||||||
1965 | 2.60 | a | 11.77 | 17.77 | 42.33 | 56.27 | 64.83 | 70.34 | 68.00 | 48.57 | 49.76 | 30.05 | 23.69 | 40.50 | ||||||||||||
1966 | -2.42 | a | 12.25 | 34.34 | b | 39.50 | 54.65 | 65.57 | 75.07 | a | 66.10 | 57.92 | 46.52 | 25.27 | 15.05 | c | 40.82 | |||||||||
1967 | 13.77 | 11.46 | 31.77 | 42.31 | a | 53.34 | 64.58 | 68.50 | a | 69.13 | 59.67 | 45.37 | 29.87 | 16.57 | a | 42.20 | ||||||||||
1968 | 9.85 | 12.62 | 37.55 | 44.71 | a | 53.11 | 65.88 | a | 69.71 | 68.25 | a | 59.07 | 46.97 | 32.97 | a | 10.27 | 42.58 | |||||||||
1969 | 0.22 | a | 17.05 | 21.73 | 46.88 | 57.42 | 60.24 | a | 71.89 | 73.68 | 61.38 | 41.89 | 33.98 | a | 17.15 | a | 41.96 | |||||||||
1970 | 2.22 | a | 15.23 | 20.73 | 41.25 | 57.52 | a | 69.28 | 73.62 | b | 72.76 | 62.47 | a | 46.47 | 28.50 | 14.95 | a | 42.08 | ||||||||
1971 | 3.00 | b | 14.83 | b | 30.79 | 48.00 | 54.18 | 69.40 | 67.42 | 71.45 | 58.97 | 47.21 | 29.57 | a | 10.37 | a | 42.10 | |||||||||
1972 | 3.41 | d | 8.62 | d | 27.85 | a | 43.77 | b | ----- | z | 64.62 | 66.79 | c | 68.56 | 55.96 | c | 40.76 | 26.67 | a | 2.37 | h | 40.70 | b | |||
1973 | 12.19 | e | 20.04 | d | 35.16 | 42.12 | 54.98 | 66.50 | 70.88 | b | 71.82 | a | 55.35 | 49.56 | 26.39 | u | 9.45 | b | 44.37 | a | ||||||
1974 | 5.15 | a | 13.07 | 24.26 | 41.27 | b | 50.20 | c | 62.40 | e | 73.97 | b | 64.43 | a | 53.98 | h | 46.95 | a | 30.00 | 19.14 | b | 39.17 | a | |||
1975 | 11.80 | d | 7.65 | b | 20.25 | c | 32.78 | 55.40 | b | 64.25 | 72.82 | 66.26 | 54.41 | a | 47.41 | c | 29.46 | f | 16.12 | a | 40.83 | a | ||||
1976 | 8.79 | 23.92 | d | 24.79 | g | 44.75 | 54.90 | 66.07 | 69.18 | 70.21 | b | 57.60 | a | 38.04 | g | 22.00 | c | 9.81 | 42.72 | b | ||||||
1977 | -3.37 | 19.48 | e | 32.39 | c | 48.62 | b | 62.10 | 64.57 | a | 70.15 | 60.44 | 54.16 | a | 42.84 | b | 24.12 | 8.15 | 40.30 | |||||||
1978 | -5.00 | 5.88 | c | 23.61 | 41.62 | 56.78 | a | 64.18 | 68.55 | b | 66.45 | ----- | z | 43.47 | 21.12 | a | ----- | z | 38.67 | b | ||||||
1979 | -5.89 | -3.89 | i | 19.28 | a | 35.83 | d | 45.63 | h | 62.08 | ----- | z | 62.38 | f | 57.45 | i | 42.89 | v | 23.30 | c | 21.86 | i | 26.92 | g | ||
1980 | ----- | z | 4.62 | u | ----- | z | ----- | z | ----- | z | ----- | z | 70.26 | d | 66.38 | b | 55.88 | 44.57 | h | 32.50 | n | 16.52 | 52.26 | h | ||
1981 | 16.31 | j | 29.88 | o | 34.05 | c | 46.94 | e | 54.50 | c | 61.95 | b | 71.02 | d | 67.81 | r | 57.57 | b | 43.60 | f | 36.41 | g | 12.43 | d | 48.35 | e |
1982 | -6.06 | n | -0.27 | m | ----- | z | 39.83 | g | 55.97 | b | 58.59 | b | ----- | z | 66.74 | b | 55.88 | b | 43.75 | c | 22.15 | g | 20.02 | b | 50.16 | f |
1983 | 16.79 | g | 22.14 | c | 27.85 | d | 38.68 | 49.10 | a | 63.12 | f | 72.00 | b | 70.18 | 55.40 | f | 43.37 | e | 29.50 | -2.08 | a | 38.97 | c | |||
1984 | 10.28 | d | 27.66 | d | 22.84 | b | 42.83 | 55.03 | n | 64.12 | b | 68.85 | d | 68.76 | f | 50.71 | f | ----- | z | 29.12 | b | 11.34 | 34.63 | d | ||
1985 | 4.81 | d | 11.58 | b | 33.47 | b | 47.97 | 61.06 | 60.62 | a | 71.23 | a | 64.37 | 54.32 | 44.12 | b | 16.22 | a | 5.37 | a | 39.60 | |||||
1986 | 14.35 | 9.38 | 35.66 | c | 41.62 | a | 55.85 | h | 67.40 | 70.68 | a | 64.47 | 55.55 | 45.73 | a | 22.66 | a | 22.63 | a | 40.92 | a | |||||
1987 | 19.97 | a | 28.13 | a | 29.10 | b | 50.31 | a | 60.06 | 69.12 | 72.59 | b | 66.23 | a | 59.35 | 41.81 | b | 33.65 | 22.56 | 46.07 | ||||||
1988 | 6.81 | d | 10.03 | 30.39 | 43.70 | b | 63.07 | a | 73.88 | 74.45 | 69.66 | c | 56.80 | 42.26 | 27.25 | 17.37 | 42.97 | |||||||||
1989 | 14.24 | b | 3.67 | a | 20.85 | a | 42.57 | 56.12 | a | 63.60 | 74.32 | a | 69.82 | a | 57.60 | 46.16 | 25.64 | a | 5.30 | a | 39.99 | |||||
1990 | 23.53 | b | 16.39 | a | 32.71 | 43.42 | 54.08 | 65.90 | a | 69.27 | a | 69.24 | 61.87 | 43.29 | 32.03 | 10.78 | a | 43.54 | ||||||||
1991 | 7.55 | 23.96 | 30.52 | 46.77 | 58.35 | a | 67.92 | 69.35 | 70.66 | 57.48 | 41.55 | 22.00 | 19.10 | a | 42.93 | |||||||||||
1992 | 19.06 | 24.67 | 33.37 | 40.58 | 58.50 | 61.48 | a | 62.69 | b | 63.95 | 55.03 | a | 44.53 | 26.86 | a | 10.66 | 41.78 | |||||||||
1993 | 5.94 | 9.16 | 26.61 | 41.57 | a | 54.48 | a | 60.07 | 64.58 | 66.55 | a | 52.27 | 41.92 | a | 25.48 | 15.05 | a | 38.64 | ||||||||
1994 | -3.68 | a | 2.09 | a | 28.92 | 42.17 | 58.94 | 66.00 | 65.95 | 65.79 | 59.82 | 47.56 | 32.05 | 17.24 | 40.24 | |||||||||||
1995 | 10.26 | b | 15.50 | 24.42 | a | 37.40 | 52.45 | 68.08 | 69.05 | a | 71.15 | a | 57.26 | a | 43.07 | b | 22.60 | 14.18 | a | 40.45 | ||||||
1996 | 0.27 | 12.78 | 16.36 | c | 37.12 | 52.55 | a | 66.43 | 67.52 | 69.52 | 57.62 | 43.91 | c | 16.08 | 5.18 | 37.11 | ||||||||||
1997 | 0.69 | 14.87 | b | 21.50 | 36.42 | 52.62 | a | 67.68 | 70.33 | a | 67.38 | a | 61.42 | 46.53 | 24.62 | a | 24.12 | a | 40.68 | |||||||
1998 | 10.19 | 25.86 | 23.60 | 47.57 | 58.69 | j | 61.50 | a | 71.28 | a | 70.40 | a | 63.55 | 46.67 | a | 29.93 | 21.41 | b | 42.91 | a | ||||||
1999 | 4.40 | a | 22.71 | 32.40 | 43.37 | 57.08 | 64.48 | 71.32 | 68.50 | a | 55.43 | 42.90 | b | 37.20 | b | 24.15 | 43.66 | |||||||||
2000 | 11.87 | a | 20.96 | a | 35.89 | 41.73 | b | 57.15 | 62.84 | b | 69.98 | b | 68.95 | c | 57.43 | a | 47.26 | b | 24.40 | a | 3.56 | 41.83 | ||||
2001 | 15.09 | d | 7.30 | e | 25.63 | a | 42.73 | b | 58.67 | e | 65.42 | 72.06 | 71.53 | a | 59.88 | e | 43.59 | b | 40.07 | a | 18.91 | b | 43.41 | |||
2002 | 17.02 | f | 25.73 | f | 20.37 | a | 43.16 | b | 50.72 | a | ----- | z | ----- | z | 67.10 | 61.69 | i | 32.21 | n | 30.23 | 20.21 | b | 38.63 | f | ||
2003 | 7.48 | c | 8.48 | c | 25.41 | d | 45.03 | 54.53 | a | 64.67 | f | 69.65 | g | 73.63 | h | 58.00 | a | 47.69 | d | ----- | z | ----- | z | 35.23 | e | |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.21 | x | 62.58 | 47.40 | 35.71 | a | 21.02 | b | 41.68 | h | ||
2005 | 6.40 | b | 20.24 | a | 29.88 | b | 50.41 | b | 53.29 | c | 68.78 | 72.74 | 69.26 | 63.18 | 48.23 | a | 33.93 | 18.84 | 44.60 | |||||||
2006 | 24.73 | a | 17.54 | c | 30.22 | b | 50.00 | b | 58.79 | 67.93 | b | 76.43 | a | 71.26 | 59.19 | c | 42.76 | 32.09 | a | 24.53 | b | 46.29 | ||||
2007 | 10.53 | 8.23 | b | 34.44 | d | 42.07 | a | 60.93 | a | 68.55 | b | 74.23 | a | 67.24 | 60.47 | 48.25 | k | 31.00 | a | 10.83 | j | 45.77 | b | |||
2008 | 7.24 | b | 10.87 | b | 27.09 | c | 40.23 | 53.26 | 64.12 | b | 71.37 | d | 69.95 | 59.59 | a | 45.00 | b | 31.45 | a | 7.62 | e | 40.65 | ||||
2009 | 4.79 | c | 11.54 | b | 21.20 | c | 41.31 | c | 55.00 | b | 63.09 | b | 67.13 | a | 66.58 | 63.00 | c | 41.48 | e | 37.19 | d | 10.50 | c | 40.23 | ||
2010 | 7.30 | c | 6.88 | b | 33.03 | a | 50.21 | a | 55.71 | 66.79 | b | 72.43 | h | ----- | z | 56.12 | a | 50.91 | d | ----- | z | ----- | z | 40.87 | d | |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | 50.68 | l | 63.27 | j | 74.59 | o | 69.61 | h | ----- | z | 50.54 | g | 31.67 | 23.02 | c | 27.34 | j | |
2012 | 19.81 | 21.38 | 40.40 | b | 47.12 | a | 58.34 | c | 69.70 | 76.25 | a | 68.84 | 58.26 | a | 43.66 | 29.45 | 14.56 | 45.65 | ||||||||
2013 | 12.15 | a | 12.14 | 15.70 | a | 32.59 | a | 53.53 | p | 62.64 | p | ----- | z | 67.50 | l | ----- | z | ----- | z | ----- | z | ----- | z | 18.14 | h | |
2014 | 10.33 | j | 9.36 | c | 24.62 | c | 38.81 | f | 55.24 | d | 66.19 | c | 68.64 | c | 68.81 | e | 58.71 | a | 48.36 | b | 22.05 | a | ----- | z | 46.89 | c |
2015 | 16.39 | i | ----- | z | ----- | z | ----- | z | 54.62 | a | ----- | z | ----- | z | ----- | z | 61.53 | a | 49.03 | a | ----- | z | 21.87 | d | 46.76 | h |
2016 | 18.05 | u | 22.87 | f | ----- | z | ----- | z | 58.91 | d | 67.76 | e | 70.47 | b | 69.56 | d | 60.76 | a | 48.42 | a | 39.95 | b | 12.60 | a | 53.55 | d |
2017 | 14.74 | d | 23.52 | a | 29.27 | e | 45.02 | g | 55.30 | i | 67.72 | 73.21 | b | 66.28 | b | 60.75 | 47.13 | 27.80 | b | 18.02 | d | 42.84 | b | |||
2018 | 12.44 | d | 8.00 | 25.88 | e | 36.02 | f | 62.80 | a | 71.11 | b | 70.85 | g | 66.98 | e | 60.37 | g | 38.59 | c | 22.64 | e | 21.96 | d | 36.71 | c | |
2019 | 14.88 | k | -2.15 | h | 19.57 | d | 41.78 | c | ----- | z | 67.05 | 72.09 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.12 | h | |
2020 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2021 | ----- | z | ----- | z | ----- | z | 40.58 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.58 | k | |
2022 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2023 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2024 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.91 | 14.59 | 27.46 | 42.93 | 56.05 | 65.62 | 70.76 | 68.39 | 58.39 | 45.66 | 28.94 | 14.96 | 41.99 | |||||||||||||
S.D. | 7.46 | 6.71 | 6.01 | 4.29 | 3.17 | 3.04 | 2.80 | 2.62 | 3.15 | 3.19 | 5.58 | 6.28 | 2.10 | |||||||||||||
SKEW | 0.11 | 0.31 | 0.00 | -0.32 | 0.23 | -0.02 | -0.41 | -0.36 | -0.35 | 0.53 | -0.13 | -0.44 | 0.12 | |||||||||||||
MAX | 24.73 | 28.13 | 40.40 | 50.41 | 63.07 | 73.88 | 76.43 | 73.68 | 65.28 | 56.52 | 40.07 | 24.53 | 46.29 | |||||||||||||
MIN | -6.39 | 2.09 | 15.70 | 32.59 | 49.10 | 58.59 | 62.69 | 60.44 | 48.57 | 38.59 | 16.08 | -2.08 | 37.11 | |||||||||||||
YRS | 48 | 49 | 52 | 51 | 48 | 51 | 50 | 51 | 51 | 50 | 50 | 51 | 31 |