YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.68 | 50.74 | e | 40.29 | e | 21.02 | h | 11.72 | b | 40.11 | h | |
1949 | -0.64 | b | 16.30 | 27.50 | b | 37.39 | l | 47.28 | a | 51.42 | 58.88 | b | 59.18 | 49.29 | i | 33.35 | d | 32.34 | e | 17.54 | d | 34.32 | b | |||
1950 | 12.76 | 22.76 | a | 24.25 | c | 36.26 | m | 39.64 | c | 49.50 | b | 54.84 | 54.84 | 50.08 | l | 41.62 | e | 26.33 | a | 21.38 | c | 34.79 | b | |||
1951 | 10.69 | 21.78 | a | 27.18 | q | 35.35 | f | 45.78 | f | 46.56 | e | 57.40 | 55.13 | 46.54 | d | 34.85 | e | 21.68 | e | 12.05 | c | 34.08 | c | |||
1952 | 12.30 | d | 16.34 | a | 21.13 | a | 38.91 | h | 45.19 | g | 52.29 | a | 55.42 | 56.19 | 51.93 | 41.85 | h | 20.65 | c | 20.27 | c | 34.06 | c | |||
1953 | 27.55 | a | 20.91 | 29.28 | a | 31.58 | d | 41.95 | i | 51.74 | a | 61.31 | 58.92 | 51.25 | d | 42.31 | d | 30.42 | f | 16.22 | d | 39.11 | b | |||
1954 | 19.62 | a | 24.94 | a | 22.62 | a | 36.77 | d | 45.07 | h | 48.00 | 60.23 | a | 55.22 | a | 49.68 | h | 34.48 | h | 28.18 | h | 14.46 | f | 38.20 | e | |
1955 | 10.67 | b | 13.52 | 17.35 | a | 32.69 | d | 43.24 | h | 49.59 | a | 58.52 | 60.39 | 48.46 | c | 40.09 | i | 20.58 | e | 15.46 | e | 32.72 | b | |||
1956 | 19.32 | 12.28 | 24.66 | 36.50 | d | 47.82 | i | 53.81 | c | 59.08 | 55.76 | 49.76 | c | 37.94 | e | 13.33 | r | 15.09 | b | 36.42 | b | |||||
1957 | 3.25 | a | 22.07 | 26.05 | 33.73 | 46.00 | 51.68 | 57.89 | 57.40 | b | 46.30 | g | 38.45 | 19.69 | d | 20.09 | n | 35.62 | b | |||||||
1958 | 15.61 | h | 25.46 | 21.86 | j | 32.73 | 48.93 | a | 51.88 | d | 54.85 | 59.24 | 49.34 | b | 41.08 | 25.57 | 20.67 | m | 43.23 | c | ||||||
1959 | 18.34 | i | 15.98 | 24.82 | 34.56 | c | 41.50 | 54.92 | 60.02 | 58.21 | 48.58 | 38.05 | 19.95 | i | 16.54 | d | 39.32 | b | ||||||||
1960 | 15.92 | e | 12.70 | b | 20.85 | k | 35.70 | 43.68 | a | 52.29 | b | 60.23 | 56.35 | a | 50.44 | d | 39.00 | k | 23.35 | g | 14.27 | c | 37.95 | c | ||
1961 | 13.04 | h | 25.29 | b | 29.50 | b | 34.15 | 45.02 | b | 55.78 | 59.71 | 60.23 | a | 43.43 | b | 36.22 | b | 22.48 | b | 13.13 | 38.63 | a | ||||
1962 | 3.42 | 18.71 | b | 24.02 | b | 36.37 | 45.88 | c | 52.03 | 56.29 | 55.61 | 49.65 | 42.20 | a | 29.21 | b | 19.92 | 36.11 | ||||||||
1963 | 4.60 | e | 25.44 | b | 25.93 | c | 34.40 | 45.88 | a | 51.28 | 58.10 | 59.00 | 54.00 | a | 42.61 | c | 28.33 | 16.83 | y | 39.05 | a | |||||
1964 | 12.90 | a | 11.50 | 18.61 | 34.08 | d | 43.47 | 49.53 | 59.58 | 54.31 | 45.74 | i | 40.20 | k | 20.84 | h | 14.60 | f | 35.50 | d | ||||||
1965 | 17.23 | 14.33 | e | 13.58 | 36.30 | b | 40.71 | 49.39 | c | 55.97 | 53.69 | 39.05 | b | 39.81 | 28.84 | b | 18.38 | b | 33.94 | |||||||
1966 | 15.02 | 15.92 | c | 30.03 | m | 34.11 | b | 47.48 | c | 49.97 | 61.32 | a | 57.13 | 51.78 | e | 36.17 | b | 28.64 | i | 16.58 | g | 40.99 | c | |||
1967 | 20.77 | i | 22.50 | g | 20.88 | s | 32.38 | b | 42.40 | b | 50.75 | 58.58 | 58.32 | 52.60 | 42.17 | p | 27.67 | i | 9.61 | 43.52 | e | |||||
1968 | 11.52 | 21.41 | 29.55 | 31.77 | 41.75 | s | 51.32 | 59.13 | 54.37 | 48.03 | 40.05 | 20.74 | a | 14.13 | 34.73 | a | ||||||||||
1969 | 18.87 | 21.34 | 22.13 | 39.07 | 47.19 | b | 49.27 | 58.13 | 60.37 | 52.37 | 33.63 | 24.30 | 17.16 | 36.98 | ||||||||||||
1970 | 18.65 | a | 22.89 | j | 24.12 | f | 28.58 | d | 44.94 | 54.08 | 59.55 | 60.34 | 44.47 | 34.58 | 30.88 | v | 15.55 | 40.08 | c | |||||||
1971 | 17.89 | 18.45 | 23.16 | ----- | z | 47.32 | c | 52.41 | s | 56.56 | 61.05 | 45.07 | 36.48 | 24.50 | 8.50 | t | 36.72 | c | ||||||||
1972 | 14.75 | i | 21.67 | 33.58 | e | 36.42 | 44.97 | b | 52.43 | 55.08 | 57.95 | 46.53 | a | 37.59 | b | 25.07 | a | 7.93 | c | 38.11 | a | |||||
1973 | 10.00 | d | 18.91 | 26.92 | 32.36 | a | 43.68 | 52.60 | a | 58.92 | 57.81 | 48.42 | 40.71 | 26.53 | a | 21.34 | b | 36.52 | ||||||||
1974 | 18.28 | f | 21.91 | a | 28.97 | b | 37.39 | c | 45.21 | j | 55.25 | 60.87 | 55.65 | 49.50 | a | 41.87 | d | 26.86 | h | 18.18 | q | 43.92 | d | |||
1975 | 5.64 | t | 17.27 | f | 24.61 | q | 26.56 | m | 42.05 | c | 49.82 | 60.77 | 56.03 | 51.90 | 38.73 | 17.39 | g | 29.17 | y | 49.88 | f | |||||
1976 | 19.05 | l | 20.10 | h | 25.50 | m | 37.11 | u | 47.04 | c | 55.17 | r | 60.69 | 56.38 | j | 47.41 | s | 35.68 | a | 27.87 | g | 10.79 | x | 47.80 | i | |
1977 | 9.20 | i | 18.08 | o | 25.79 | l | 37.95 | i | 43.95 | c | 54.83 | 57.95 | j | ----- | z | 51.06 | u | ----- | z | 26.12 | v | 11.58 | s | 49.39 | j | |
1978 | 16.86 | m | 20.57 | m | 33.25 | m | 36.39 | h | 41.84 | c | 50.60 | 55.69 | g | 53.38 | n | ----- | z | ----- | z | 15.73 | q | 7.97 | p | 46.22 | j | |
1979 | -0.81 | d | 21.88 | d | 26.54 | f | 34.10 | e | 45.65 | h | 51.21 | d | 58.52 | b | 57.88 | b | 50.31 | f | 40.44 | e | 16.90 | j | 18.02 | i | 37.60 | e |
1980 | 9.47 | m | 21.30 | n | 26.30 | u | 37.37 | c | 46.94 | e | 54.68 | m | 59.37 | 54.40 | b | ----- | z | 41.90 | p | 26.57 | a | 22.98 | d | 41.27 | f | |
1981 | 19.46 | d | 19.22 | e | 31.05 | i | ----- | z | ----- | z | ----- | z | ----- | z | 60.21 | ----- | z | ----- | z | ----- | z | 17.78 | f | 32.96 | i | |
1982 | 12.07 | k | ----- | z | ----- | z | ----- | z | ----- | z | 50.52 | e | 54.96 | c | ----- | z | ----- | z | ----- | z | 19.80 | e | 18.65 | d | 35.98 | h |
1983 | ----- | z | 22.05 | h | 30.61 | h | 29.88 | j | ----- | z | 48.56 | l | 54.60 | b | 56.64 | b | 46.58 | e | 40.83 | g | 26.95 | a | 4.87 | a | 37.93 | g |
1984 | 10.52 | b | 15.30 | b | 28.31 | e | 33.62 | f | 41.90 | e | ----- | z | 59.63 | a | 57.61 | d | 44.07 | a | 33.11 | c | 23.42 | 9.19 | 32.31 | b | ||
1985 | 7.88 | a | 8.74 | c | 22.33 | e | 37.03 | 45.72 | d | 52.68 | b | 60.07 | c | 54.11 | c | 44.14 | b | 35.48 | b | 17.72 | a | 8.73 | e | 32.89 | ||
1986 | 16.06 | 21.71 | b | 32.41 | b | 37.26 | i | 44.12 | b | 55.68 | b | ----- | z | 57.43 | b | 44.27 | 38.45 | b | 22.09 | g | 9.77 | a | 35.54 | c | ||
1987 | 10.25 | i | 18.71 | g | 26.73 | a | 39.07 | c | 48.19 | 52.18 | b | 55.52 | 54.76 | 49.95 | b | 38.34 | b | 27.17 | c | 13.45 | a | 40.54 | b | |||
1988 | 9.61 | i | 19.40 | d | 22.31 | g | 36.98 | c | 44.92 | 57.67 | a | 60.70 | a | 56.28 | b | 47.28 | g | 44.53 | b | 23.63 | c | 10.84 | c | 39.44 | c | |
1989 | 12.03 | a | 9.08 | c | 27.23 | c | 35.46 | c | 44.10 | a | 51.98 | 60.64 | f | 55.61 | 48.72 | 38.56 | 26.92 | 12.73 | 32.95 | a | ||||||
1990 | 15.75 | a | 15.26 | a | 27.24 | 38.63 | 41.71 | 50.91 | b | 57.73 | 58.31 | 53.90 | a | 36.90 | 28.00 | 1.85 | 35.52 | |||||||||
1991 | 11.44 | 24.95 | 25.79 | 33.88 | 43.34 | 53.02 | 59.55 | b | 59.64 | b | 48.10 | e | 35.10 | a | 18.33 | 11.95 | 35.42 | |||||||||
1992 | 13.11 | 23.70 | b | 33.23 | 40.07 | 48.00 | b | 52.46 | b | 53.27 | a | 55.02 | 46.15 | 40.07 | a | 19.36 | a | 12.33 | b | 36.40 | ||||||
1993 | 11.30 | a | 13.52 | b | 28.98 | b | 35.16 | a | 47.96 | c | 49.89 | c | 51.26 | 53.30 | a | 46.40 | a | 38.98 | b | 18.83 | a | 15.12 | a | 34.22 | ||
1994 | 20.60 | a | 13.69 | a | 29.55 | a | 37.67 | a | 48.62 | b | 52.62 | a | 57.08 | a | 58.92 | 49.48 | a | 38.60 | 17.17 | a | 17.02 | b | 36.75 | |||
1995 | 14.05 | a | 23.16 | 26.16 | b | 34.92 | 42.98 | 52.73 | d | 60.63 | a | 58.98 | b | 49.87 | 35.42 | a | 28.95 | 19.68 | 37.29 | |||||||
1996 | 12.18 | a | 16.00 | b | 23.21 | b | 36.69 | a | 41.75 | a | 54.76 | a | 60.08 | 57.72 | a | 45.45 | a | 36.73 | 24.97 | a | 15.77 | 35.44 | ||||
1997 | 11.02 | a | 13.96 | 23.98 | a | 29.12 | a | 45.33 | b | 57.04 | b | 59.80 | f | 58.78 | b | 51.31 | d | 38.28 | a | 26.34 | a | 13.73 | 33.54 | a | ||
1998 | 18.13 | 21.00 | a | 26.80 | a | 36.62 | a | 45.72 | b | 47.14 | a | 62.00 | 59.81 | 54.28 | a | ----- | z | 28.18 | 13.65 | 37.57 | a | |||||
1999 | 17.68 | a | 19.21 | 25.85 | 32.28 | 41.83 | a | 48.69 | a | 55.32 | a | 58.35 | 42.68 | 37.45 | c | 30.05 | 12.65 | 35.17 | ||||||||
2000 | 14.23 | c | 20.83 | c | 24.00 | 35.50 | c | 43.03 | b | 48.58 | 56.87 | a | 56.13 | a | 47.52 | b | 40.13 | d | 15.85 | c | 14.00 | 34.72 | ||||
2001 | 11.34 | 17.38 | 30.35 | a | 36.42 | 46.69 | 53.52 | 61.31 | 61.48 | 52.93 | 37.85 | a | 30.43 | a | 15.02 | 37.89 | ||||||||||
2002 | 14.71 | 14.52 | a | 22.21 | 35.53 | 43.33 | b | 53.62 | a | 62.79 | 55.47 | 50.17 | 32.23 | 21.66 | a | 18.37 | 35.38 | |||||||||
2003 | 19.00 | 15.38 | 27.98 | 36.98 | 43.97 | a | 49.75 | 62.27 | 61.34 | 47.17 | 41.27 | a | 18.48 | a | 18.81 | 36.87 | ||||||||||
2004 | 15.47 | b | 18.43 | 33.55 | 40.75 | 45.15 | a | 52.63 | 59.60 | 56.73 | 49.15 | d | 39.62 | b | 25.97 | 22.20 | a | 38.27 | ||||||||
2005 | 17.73 | a | 18.34 | 29.27 | 36.28 | 44.56 | 50.33 | a | 60.63 | a | 56.84 | 48.05 | a | 40.85 | a | 25.40 | ----- | z | 38.94 | a | ||||||
2006 | 18.69 | 14.61 | 25.87 | a | 37.72 | a | 45.43 | a | 55.02 | c | 61.03 | b | 56.50 | 49.07 | 37.59 | c | 28.00 | b | 17.63 | e | 37.26 | |||||
2007 | 9.87 | a | 22.83 | a | 33.52 | b | 38.52 | b | 47.78 | a | 55.03 | 67.13 | 60.05 | 51.64 | a | 38.86 | c | 26.30 | c | 14.00 | b | 38.79 | ||||
2008 | 10.79 | 20.33 | c | 22.38 | b | 27.54 | d | 43.24 | d | 50.27 | 58.39 | 58.85 | 47.67 | a | 38.35 | a | 31.16 | a | 13.63 | a | 35.22 | |||||
2009 | 15.24 | 18.50 | 24.48 | a | 34.85 | 45.92 | a | 49.79 | b | 57.07 | b | 57.23 | 53.98 | 32.03 | a | 27.38 | a | ----- | z | 37.86 | a | |||||
2010 | 17.62 | c | 20.96 | c | 31.43 | b | 36.50 | a | 39.83 | a | 51.90 | a | 58.47 | 57.63 | a | 51.75 | b | 43.32 | 24.02 | 18.39 | 37.65 | |||||
2011 | 15.11 | 11.38 | 27.68 | 31.21 | a | 41.90 | 51.13 | 60.97 | 61.31 | 52.88 | 41.08 | a | 22.25 | 12.79 | b | 35.81 | ||||||||||
2012 | 18.00 | 18.21 | a | 32.26 | 41.58 | 44.79 | 54.52 | 63.52 | 61.23 | 53.62 | 37.26 | 29.95 | 19.53 | a | 39.54 | |||||||||||
2013 | 12.32 | 19.52 | 25.73 | 33.85 | 47.55 | 54.42 | 62.81 | 61.77 | 53.65 | 35.40 | 26.95 | 10.56 | 37.04 | |||||||||||||
2014 | 15.48 | 15.48 | 26.66 | 35.87 | 47.50 | 51.57 | 61.55 | 57.40 | 51.70 | 42.63 | 23.83 | 20.44 | 37.51 | |||||||||||||
2015 | 18.11 | 26.21 | 33.06 | 38.83 | 46.24 | 58.15 | 58.29 | 58.18 | 53.22 | 45.52 | 19.87 | 15.40 | 39.26 | |||||||||||||
2016 | 19.10 | 24.16 | 29.82 | 41.68 | 46.16 | 57.50 | 59.66 | 58.68 | 50.70 | 42.55 | 33.13 | 9.15 | 39.36 | |||||||||||||
2017 | 8.11 | 22.95 | 36.39 | 38.58 | 46.19 | 54.21 | a | 61.40 | 59.15 | 50.27 | 37.61 | 27.10 | 16.98 | 38.25 | ||||||||||||
2018 | 20.06 | 15.04 | 27.13 | 35.87 | 49.13 | 52.50 | g | 60.61 | 57.84 | 50.77 | 38.73 | 22.98 | 16.02 | 35.83 | a | |||||||||||
2019 | 15.24 | 13.41 | 22.29 | 38.72 | 44.15 | 52.30 | 59.79 | 59.98 | 50.38 | 28.55 | a | 25.35 | 16.84 | 35.58 | ||||||||||||
2020 | 19.97 | 15.40 | 28.06 | 33.70 | 47.52 | 52.87 | 59.14 | c | 62.63 | 51.95 | 36.61 | 24.28 | 16.27 | 37.37 | ||||||||||||
2021 | 15.98 | 13.34 | 27.16 | 34.60 | 44.82 | 59.18 | 65.00 | 58.61 | 51.90 | 39.94 | 31.95 | 23.28 | a | 38.81 | ||||||||||||
2022 | 12.18 | 14.70 | 28.11 | 32.12 | 42.77 | 52.25 | 62.65 | 62.90 | b | 55.22 | 41.97 | 15.78 | 17.76 | b | 36.53 | |||||||||||
2023 | 13.79 | 13.39 | 19.37 | 31.42 | 50.08 | 52.95 | 60.58 | 60.24 | 52.03 | 39.50 | 29.52 | a | 21.50 | b | 37.03 | |||||||||||
2024 | 16.10 | 23.86 | 26.30 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.09 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 14.04 | 18.32 | 26.61 | 35.43 | 44.95 | 52.28 | 59.13 | 57.89 | 49.47 | 38.42 | 24.77 | 15.19 | 36.67 | |||||||||||||
S.D. | 5.18 | 4.38 | 4.28 | 2.97 | 2.42 | 2.60 | 2.74 | 2.27 | 3.30 | 3.21 | 4.30 | 4.37 | 1.61 | |||||||||||||
SKEW | -0.71 | -0.08 | -0.32 | -0.29 | -0.12 | 0.39 | -0.17 | 0.05 | -0.68 | -0.42 | -0.24 | -0.49 | -0.15 | |||||||||||||
MAX | 27.55 | 26.21 | 36.39 | 41.68 | 50.08 | 59.18 | 67.13 | 62.90 | 55.22 | 45.52 | 33.13 | 23.28 | 39.54 | |||||||||||||
MIN | -0.81 | 8.74 | 13.58 | 27.54 | 39.64 | 46.56 | 51.26 | 53.30 | 39.05 | 28.55 | 15.78 | 1.85 | 32.89 | |||||||||||||
YRS | 61 | 66 | 60 | 61 | 63 | 68 | 69 | 72 | 63 | 63 | 58 | 60 | 34 |