YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | 52.34 | o | 65.30 | 70.44 | 65.15 | 59.13 | 55.58 | 35.33 | 8.07 | a | 51.28 | e | ||||||
1964 | 16.69 | 17.21 | 21.05 | a | 42.70 | 57.84 | 62.38 | 69.38 | b | 62.68 | 56.23 | 45.56 | 30.85 | 8.37 | 40.91 | |||||||||||
1965 | 4.29 | 6.88 | 14.61 | 39.82 | 54.63 | 60.25 | 65.40 | a | 63.45 | 48.92 | 47.34 | 29.48 | 21.69 | 38.06 | ||||||||||||
1966 | -1.78 | a | 12.30 | 29.78 | a | 37.63 | 49.40 | 64.13 | 71.26 | 63.47 | 56.04 | b | 44.77 | a | 26.29 | a | 13.05 | 38.86 | ||||||||
1967 | 11.10 | 4.94 | j | 25.84 | 39.83 | 48.08 | 62.17 | 65.73 | 63.24 | 56.71 | b | 43.68 | 27.43 | a | 16.35 | 41.83 | a | |||||||||
1968 | 9.08 | 9.97 | 33.97 | 43.22 | 51.23 | 62.27 | 67.45 | a | 66.17 | a | 57.52 | a | 48.10 | a | 30.20 | 12.31 | 40.96 | |||||||||
1969 | 4.90 | a | 15.91 | 20.52 | 43.32 | 54.87 | 56.60 | a | 66.00 | 69.77 | 57.98 | 42.06 | 30.18 | 16.37 | 39.87 | |||||||||||
1970 | 1.84 | 10.88 | 19.53 | 39.67 | 51.85 | 65.52 | 70.18 | 67.38 | a | 57.86 | a | 46.03 | 28.27 | 11.92 | 39.24 | |||||||||||
1971 | 0.74 | 12.84 | 23.08 | 41.97 | 50.98 | 65.93 | 64.39 | 64.24 | 58.93 | a | 49.52 | a | 29.33 | 14.47 | a | 39.70 | ||||||||||
1972 | 1.03 | 5.53 | 21.10 | 37.83 | 57.87 | 62.57 | 66.77 | 65.98 | a | 54.40 | 41.69 | b | 28.34 | a | 7.34 | 37.54 | ||||||||||
1973 | 10.42 | 13.59 | 35.05 | 40.48 | 51.10 | 63.58 | 67.73 | 68.45 | 56.32 | 51.19 | 30.37 | 13.30 | c | 41.80 | ||||||||||||
1974 | 5.65 | 10.05 | 22.16 | 41.84 | a | 49.48 | 61.80 | 70.48 | 63.02 | 51.42 | 45.13 | 31.33 | 19.39 | 39.31 | ||||||||||||
1975 | 8.77 | a | 11.84 | 17.18 | a | 33.57 | 57.16 | 62.32 | 71.34 | 64.75 | c | 53.97 | 46.90 | 32.08 | 12.32 | a | 39.35 | |||||||||
1976 | 4.00 | 20.23 | a | 23.44 | 45.93 | a | 52.62 | a | 65.40 | 67.73 | 67.84 | 56.43 | 38.23 | 21.45 | 2.95 | 38.85 | ||||||||||
1977 | -6.16 | b | 15.00 | 32.27 | 46.77 | f | 61.78 | b | ----- | z | ----- | z | ----- | z | 54.80 | o | 44.82 | c | 27.22 | 10.02 | b | 26.42 | e | |||
1978 | 2.19 | ----- | z | 23.41 | c | 38.69 | a | 56.66 | b | 61.82 | 64.86 | c | 64.50 | 58.57 | 44.27 | g | 29.25 | b | 7.53 | 40.75 | b | |||||
1979 | -4.90 | 3.68 | 23.31 | 36.73 | b | 47.28 | b | 60.83 | 66.67 | a | 62.44 | 59.09 | a | 40.74 | f | 28.53 | 18.84 | 36.59 | a | |||||||
1980 | 5.03 | b | 9.65 | i | 25.87 | l | 43.73 | 57.05 | 61.77 | 68.42 | 64.77 | 53.57 | a | 40.10 | g | 30.83 | 12.21 | 44.15 | c | |||||||
1981 | 11.71 | 19.02 | 32.67 | a | 42.10 | j | 52.55 | 61.90 | 66.74 | 64.53 | a | ----- | z | ----- | z | ----- | z | ----- | z | 44.16 | e | |||||
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | 38.30 | 49.66 | c | 63.37 | 72.44 | 71.31 | 57.98 | 44.66 | 29.23 | -0.09 | b | 47.43 | c | |||||||
1984 | 6.22 | a | 24.21 | 21.32 | 43.77 | 51.48 | a | 64.05 | a | 67.76 | 68.83 | a | 51.22 | a | 47.03 | a | 27.85 | 12.33 | a | 40.51 | ||||||
1985 | 6.00 | b | 10.46 | 29.56 | 44.20 | 57.34 | 59.00 | 66.76 | 62.50 | 53.40 | a | 43.27 | 19.82 | 2.55 | a | 37.91 | ||||||||||
1986 | 12.33 | h | 9.70 | 27.73 | 43.60 | a | 54.84 | 62.59 | b | 69.24 | 63.00 | 55.25 | 44.31 | 24.35 | 18.23 | a | 42.99 | a | ||||||||
1987 | 19.84 | f | 25.54 | 33.38 | a | 48.15 | 57.17 | a | 66.35 | 71.48 | 65.63 | a | 57.25 | 40.66 | 32.88 | 19.83 | a | 47.12 | a | |||||||
1988 | 3.60 | 6.29 | 26.26 | b | 41.62 | b | 61.03 | 67.43 | a | 72.13 | 67.40 | e | 56.42 | 39.19 | b | 27.85 | 12.90 | 40.18 | ||||||||
1989 | 10.84 | -0.30 | 21.10 | a | 38.93 | a | 53.90 | a | 62.41 | a | 70.78 | a | 65.95 | 56.28 | 43.61 | 23.87 | 4.74 | 37.68 | ||||||||
1990 | 19.32 | 13.07 | a | 28.35 | d | 41.34 | a | 50.37 | a | 64.02 | ----- | z | ----- | z | 59.68 | 42.32 | a | 33.03 | a | 11.50 | a | 36.30 | b | |||
1991 | 4.79 | b | 16.62 | 27.23 | 43.21 | a | 56.61 | 64.88 | d | 66.84 | 68.62 | a | 55.37 | 42.63 | 21.74 | a | 13.55 | c | 40.17 | |||||||
1992 | 14.92 | 21.70 | a | 26.73 | a | 37.00 | k | 55.23 | a | 59.19 | a | 60.34 | 61.98 | 55.56 | e | 43.57 | a | 28.20 | g | 14.11 | c | 41.33 | b | |||
1993 | 8.47 | b | 11.56 | d | 24.00 | o | 37.04 | g | 51.20 | d | 59.17 | a | 64.32 | 64.83 | b | 51.64 | a | 41.48 | 25.34 | e | 13.06 | d | 39.11 | b | ||
1994 | -2.80 | a | 4.07 | e | 24.79 | e | 37.90 | f | 55.62 | b | 64.90 | a | 66.60 | a | 63.92 | a | 59.98 | d | 47.63 | h | 33.75 | f | 20.08 | m | 42.13 | d |
1995 | 11.10 | e | 8.17 | b | 28.20 | c | 35.27 | f | 51.59 | b | 67.63 | d | 67.06 | g | 68.68 | f | 55.42 | d | 43.42 | k | 20.52 | i | 11.23 | c | 33.33 | e |
1996 | -1.50 | a | 9.59 | a | 18.34 | b | 33.81 | d | 50.57 | c | 62.39 | b | 65.09 | d | 67.55 | a | 58.25 | 44.06 | d | 21.42 | 8.93 | b | 36.54 | |||
1997 | 3.03 | 14.04 | c | 23.12 | e | 37.37 | d | 47.50 | a | 64.69 | c | 65.67 | e | 62.11 | c | 60.19 | a | 46.27 | a | 26.04 | c | 23.74 | b | 39.48 | ||
1998 | 12.40 | a | 27.40 | c | 26.25 | a | 45.40 | 59.77 | c | 62.52 | a | 68.20 | f | 67.68 | f | 62.18 | e | 47.68 | f | 34.06 | d | 19.84 | b | 38.87 | c | |
1999 | 7.58 | 21.34 | 32.50 | p | 43.09 | n | 55.80 | c | 64.16 | a | 71.81 | e | 66.06 | d | 58.87 | g | 46.00 | a | 37.83 | a | 20.73 | c | 43.48 | c | ||
2000 | 9.61 | ----- | z | 38.23 | r | 35.63 | k | 56.09 | d | 59.84 | b | 66.72 | a | 67.31 | b | 55.46 | d | 47.95 | l | 31.00 | 5.90 | b | 43.99 | d | ||
2001 | 14.10 | ----- | z | ----- | z | ----- | z | ----- | z | 61.26 | a | ----- | z | ----- | z | ----- | z | ----- | z | 35.82 | p | 23.37 | 32.91 | i | ||
2002 | 17.74 | 22.77 | 18.50 | 38.88 | 48.40 | 65.93 | 70.73 | 65.87 | 59.83 | 37.90 | 28.02 | a | 21.21 | 41.32 | ||||||||||||
2003 | 9.40 | 9.93 | 24.60 | 41.05 | 53.13 | 61.83 | 67.94 | 69.29 | 58.13 | 46.73 | 27.20 | 20.55 | 40.81 | |||||||||||||
2004 | 4.32 | 15.43 | 29.11 | 41.97 | a | 50.48 | 59.47 | a | 65.65 | 60.32 | 62.00 | 47.11 | 34.62 | 15.45 | 40.49 | |||||||||||
2005 | 5.95 | 19.39 | 24.95 | 46.18 | 51.77 | 66.65 | 69.81 | 66.63 | 61.00 | 47.24 | 32.20 | 17.85 | 42.47 | |||||||||||||
2006 | 23.66 | 11.39 | 30.15 | 47.07 | 55.15 | 63.18 | 71.92 | 67.03 | 55.47 | 41.83 | a | 31.62 | 23.73 | 43.52 | ||||||||||||
2007 | 13.89 | 7.29 | 30.35 | 39.80 | 56.87 | 66.38 | 68.89 | 65.37 | 58.13 | 49.34 | 30.82 | 11.35 | 41.54 | |||||||||||||
2008 | 8.45 | a | 8.67 | 21.23 | a | 38.20 | c | 49.79 | 61.77 | 67.47 | 65.87 | 58.04 | b | 45.10 | 31.32 | b | 6.53 | a | 38.54 | |||||||
2009 | -0.33 | b | 14.36 | 25.10 | 41.26 | a | 53.57 | b | 60.72 | a | 62.58 | 64.13 | 62.93 | a | 39.26 | 37.27 | b | 12.56 | 39.45 | |||||||
2010 | 8.39 | 14.60 | d | 35.65 | 48.63 | 55.11 | 62.52 | 69.55 | 69.56 | 54.08 | 48.94 | 31.33 | a | 11.59 | c | 42.50 | ||||||||||
2011 | 5.13 | a | 12.88 | b | 22.30 | h | 40.85 | 52.69 | 61.87 | 72.10 | b | 68.16 | 57.02 | 50.07 | a | 32.72 | a | 22.35 | 43.26 | a | ||||||
2012 | 15.76 | f | 22.36 | a | 41.05 | 44.17 | 56.98 | 64.64 | b | 73.04 | c | 66.45 | 56.19 | a | 43.38 | b | 30.40 | a | 15.14 | i | 49.87 | b | ||||
2013 | 7.52 | h | 12.25 | 20.76 | 31.96 | p | 52.05 | a | 61.85 | 68.33 | a | 68.10 | 61.02 | c | 45.03 | 27.64 | a | 4.44 | 42.15 | b | ||||||
2014 | 0.75 | g | 2.57 | 17.10 | 36.29 | a | 52.68 | 63.50 | a | 66.23 | a | 66.36 | c | 57.83 | d | 44.74 | d | 21.79 | a | 18.70 | f | 42.91 | b | |||
2015 | 18.39 | h | 4.70 | 28.98 | 43.74 | a | 53.79 | 63.24 | a | 68.70 | d | 65.37 | 63.70 | 47.02 | b | 38.33 | a | 25.44 | 45.73 | a | ||||||
2016 | 11.98 | 17.36 | 34.84 | 41.12 | 54.79 | 63.28 | c | 68.27 | a | 67.95 | 59.93 | 47.29 | 39.60 | d | 15.85 | 43.52 | ||||||||||
2017 | 14.05 | a | 21.43 | a | 26.55 | 43.32 | 52.70 | c | 63.22 | 67.44 | 62.80 | a | 60.87 | o | ----- | z | 26.19 | f | 12.66 | 40.46 | c | |||||
2018 | 9.13 | 7.39 | 26.68 | 31.89 | c | 59.81 | 64.40 | 69.73 | 67.80 | a | 58.88 | 40.53 | 22.93 | 20.55 | 39.98 | |||||||||||
2019 | 4.55 | 5.73 | 21.71 | 39.95 | 49.52 | 63.84 | a | 70.68 | 65.52 | 59.85 | 42.80 | a | 25.37 | 16.11 | 38.80 | |||||||||||
2020 | 13.47 | b | 14.07 | 29.84 | 38.46 | c | 52.42 | a | 66.27 | 71.29 | 68.41 | c | 55.85 | 38.82 | 34.41 | b | 19.40 | b | 41.89 | |||||||
2021 | 16.35 | 4.95 | 33.55 | c | 41.59 | b | 53.91 | b | 68.48 | 69.81 | 69.97 | 61.60 | 51.42 | 31.65 | 17.85 | 43.43 | ||||||||||
2022 | 0.97 | 4.25 | 24.97 | a | 35.05 | a | 54.62 | a | 64.52 | 68.13 | a | 67.38 | b | 60.65 | c | 46.90 | 31.30 | 13.19 | 39.33 | |||||||
2023 | 16.06 | 13.32 | 21.15 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.85 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.60 | 12.74 | 25.93 | 40.96 | 53.66 | 63.17 | 68.28 | 65.87 | 57.35 | 44.92 | 29.50 | 14.03 | 40.13 | |||||||||||||
S.D. | 6.36 | 6.38 | 5.55 | 3.68 | 3.40 | 2.36 | 2.68 | 2.41 | 3.07 | 3.64 | 4.44 | 5.99 | 1.76 | |||||||||||||
SKEW | 0.09 | 0.29 | 0.36 | -0.21 | 0.24 | -0.14 | -0.42 | -0.03 | -0.34 | 0.29 | -0.05 | -0.19 | 0.24 | |||||||||||||
MAX | 23.66 | 27.40 | 41.05 | 48.63 | 61.78 | 68.48 | 73.04 | 71.31 | 63.70 | 55.58 | 39.60 | 25.44 | 43.52 | |||||||||||||
MIN | -6.16 | -0.30 | 14.61 | 31.89 | 47.28 | 56.60 | 60.34 | 60.32 | 48.92 | 37.90 | 19.82 | -0.09 | 36.54 | |||||||||||||
YRS | 52 | 53 | 52 | 48 | 57 | 58 | 54 | 54 | 54 | 49 | 53 | 55 | 34 |