YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.57 | h | 55.10 | 42.06 | 23.23 | 23.06 | 35.87 | h | ||||
1939 | 20.90 | b | 14.14 | 32.23 | 41.93 | a | 48.50 | a | 53.17 | 61.63 | a | 61.39 | 57.27 | 51.48 | ----- | z | ----- | z | 44.26 | b | ||||||
1940 | ----- | z | ----- | z | ----- | z | 39.57 | b | 50.67 | a | 59.73 | 64.04 | e | 64.06 | 52.04 | d | 43.45 | 26.82 | h | 19.00 | 49.07 | d | ||||
1941 | ----- | z | 21.08 | b | 22.42 | 33.23 | d | 47.65 | 53.97 | a | 67.35 | 65.74 | 55.11 | b | 48.73 | a | 31.70 | 22.90 | a | 42.72 | a | |||||
1942 | 18.42 | 18.64 | 27.52 | 39.47 | 42.45 | 51.43 | 60.10 | a | 58.31 | b | 48.59 | a | 43.06 | 27.90 | a | 22.80 | a | 38.22 | ||||||||
1943 | 22.45 | b | 30.09 | q | 31.48 | b | 42.97 | 44.15 | e | 50.23 | 60.81 | 58.19 | 54.50 | d | 40.90 | b | 27.67 | c | 21.92 | e | 41.39 | a | ||||
1944 | 17.16 | 21.31 | 28.35 | 35.47 | 45.58 | 49.36 | b | 59.00 | 61.06 | 52.77 | 46.53 | p | 26.35 | g | 22.32 | 39.24 | b | |||||||||
1945 | 23.39 | 27.61 | 29.61 | h | 34.97 | 47.71 | 49.57 | 63.00 | 61.06 | 52.43 | b | 46.78 | h | 24.44 | n | 18.74 | 42.05 | c | ||||||||
1946 | 18.06 | 23.82 | 33.39 | 40.54 | q | 45.50 | e | 57.10 | 63.94 | 60.90 | 52.76 | a | 38.32 | 28.80 | j | 23.71 | n | 43.75 | c | |||||||
1947 | 18.63 | a | 27.83 | d | 33.48 | 38.20 | 50.97 | 52.20 | 61.48 | 59.16 | 55.27 | 47.68 | i | ----- | z | 17.71 | j | 44.14 | c | |||||||
1948 | 19.58 | 21.31 | 23.79 | l | 36.96 | c | 45.88 | e | 57.50 | l | 61.28 | m | 59.19 | 55.40 | 38.17 | m | 26.90 | t | 20.04 | d | 36.91 | e | ||||
1949 | 10.65 | 11.25 | 30.55 | 42.67 | 47.04 | d | 51.00 | n | 63.08 | e | 62.52 | f | 52.71 | i | 37.17 | h | 35.33 | 20.60 | f | 34.37 | e | |||||
1950 | 19.91 | t | 23.75 | 29.48 | 33.67 | u | 43.83 | g | 54.90 | 61.26 | 58.81 | 51.63 | 45.39 | 30.27 | 24.81 | 42.25 | c | |||||||||
1951 | 18.56 | m | 20.25 | 29.19 | 40.25 | j | 45.94 | 52.93 | 60.29 | 54.35 | 48.19 | d | 34.71 | 20.09 | s | 12.26 | 39.79 | c | ||||||||
1952 | 14.96 | e | 18.65 | c | 23.48 | 36.31 | d | 43.42 | 51.17 | 60.68 | 58.52 | 51.23 | 44.45 | 23.94 | n | 18.64 | c | 38.32 | a | |||||||
1953 | 20.61 | 22.36 | 29.35 | 33.97 | 40.92 | e | 52.47 | 62.42 | 56.94 | 55.25 | f | ----- | z | 30.10 | 19.13 | 36.83 | b | |||||||||
1954 | 20.39 | 30.75 | 29.10 | 44.94 | l | 49.81 | 53.17 | 65.13 | 58.84 | 51.33 | 45.10 | j | ----- | z | 17.58 | 41.79 | c | |||||||||
1955 | 12.81 | 10.82 | 26.40 | f | 35.35 | d | 44.48 | 51.50 | 59.61 | 62.68 | 55.10 | 44.00 | a | 34.77 | h | 25.26 | 40.16 | b | ||||||||
1956 | 25.26 | 20.90 | 29.45 | 39.13 | 48.45 | 57.50 | 62.48 | 57.68 | 57.70 | 41.84 | 24.70 | 19.47 | a | 40.38 | ||||||||||||
1957 | 19.03 | 27.50 | 33.35 | 37.52 | a | 45.03 | 57.40 | 61.29 | 59.87 | 52.53 | 41.77 | 26.43 | 22.23 | 40.33 | ||||||||||||
1958 | 19.42 | 29.71 | 28.23 | 37.13 | 50.19 | 51.40 | 60.48 | 62.16 | 53.30 | 44.65 | 30.20 | 24.84 | 40.98 | |||||||||||||
1959 | 19.13 | 25.68 | 30.23 | 39.62 | d | 43.83 | b | 56.00 | 61.61 | 58.76 | b | 51.03 | 40.97 | 28.71 | b | 22.32 | 39.82 | |||||||||
1960 | 12.48 | 20.44 | b | 33.14 | b | 39.33 | 45.38 | b | 54.90 | 62.90 | 61.35 | 54.19 | c | 41.42 | 29.70 | c | 20.69 | e | 39.66 | |||||||
1961 | 17.61 | c | 26.59 | a | 31.35 | 38.10 | 46.97 | 59.00 | 63.00 | a | 60.94 | 46.03 | 39.10 | 26.68 | b | 15.77 | 39.26 | |||||||||
1962 | 18.29 | 26.56 | a | 26.29 | 42.90 | 43.48 | 55.63 | 60.58 | 59.10 | 53.10 | 42.84 | 33.66 | a | 22.45 | b | 40.41 | ||||||||||
1963 | 9.71 | 28.93 | 28.35 | 35.41 | a | 48.84 | 51.48 | a | 61.52 | 59.97 | 55.13 | 49.42 | 32.47 | 20.73 | a | 40.16 | ||||||||||
1964 | 16.13 | a | 21.90 | 25.87 | 37.10 | 45.68 | 54.03 | 65.35 | 61.52 | 51.63 | c | 46.06 | 26.67 | 21.90 | 39.49 | |||||||||||
1965 | 23.87 | 24.36 | 27.68 | 36.97 | 43.06 | 51.50 | 59.90 | a | 59.58 | 47.34 | a | 47.00 | 35.90 | 20.52 | 39.81 | |||||||||||
1966 | 16.87 | 18.89 | 30.10 | 39.53 | 49.74 | 56.23 | 63.52 | 61.68 | 54.47 | 42.90 | 32.93 | 20.39 | 40.60 | |||||||||||||
1967 | 16.90 | 25.71 | 36.78 | m | 34.83 | 44.06 | 53.60 | 64.52 | 63.81 | 54.93 | a | 44.61 | 35.33 | 14.42 | 41.16 | a | ||||||||||
1968 | 13.52 | 29.90 | 33.94 | 35.67 | 46.19 | 57.37 | 62.58 | 57.42 | 52.27 | 43.29 | 30.33 | 16.29 | 39.90 | |||||||||||||
1969 | 21.00 | 22.11 | 27.81 | 41.17 | 52.32 | c | 53.17 | 64.16 | 65.32 | 55.97 | 37.06 | 29.73 | 24.93 | a | 41.23 | |||||||||||
1970 | 19.81 | 29.46 | 30.42 | 33.47 | 47.94 | 55.37 | 61.26 | 62.68 | 49.50 | 37.55 | 27.77 | 19.77 | 39.58 | |||||||||||||
1971 | 19.23 | 23.64 | 27.16 | 37.13 | 43.03 | 56.13 | 63.94 | 62.68 | 49.33 | 40.81 | 27.13 | 18.10 | 39.03 | |||||||||||||
1972 | 22.55 | 27.41 | 38.90 | 39.83 | 47.90 | 58.37 | 64.06 | 61.39 | 52.27 | 43.32 | 27.47 | 16.84 | 41.69 | |||||||||||||
1973 | 11.06 | 22.79 | 28.74 | 34.60 | 47.45 | 55.17 | 62.10 | 61.65 | 50.90 | 43.00 | 28.70 | 22.19 | 39.03 | |||||||||||||
1974 | 12.00 | 17.00 | 34.87 | 35.80 | 50.81 | 60.13 | 63.06 | 60.97 | 53.73 | 45.06 | 30.90 | 21.19 | 40.46 | |||||||||||||
1975 | 15.73 | a | 22.14 | 29.90 | 31.60 | 43.58 | 52.87 | 63.00 | 60.00 | 54.13 | 40.61 | 27.67 | 20.42 | 38.47 | ||||||||||||
1976 | 17.26 | 27.72 | 27.19 | 37.47 | 49.10 | 55.43 | 64.87 | 59.52 | 54.37 | 41.35 | 33.20 | 20.52 | 40.67 | |||||||||||||
1977 | 18.90 | 27.64 | 25.55 | 41.73 | 43.90 | 60.93 | 63.32 | 63.26 | 53.13 | 44.61 | 30.63 | 28.00 | 41.80 | |||||||||||||
1978 | 23.13 | 26.29 | 37.16 | 39.53 | 45.32 | 57.23 | 62.26 | 60.81 | 51.47 | 47.26 | 31.97 | 14.29 | 41.39 | |||||||||||||
1979 | 11.68 | 17.96 | 31.55 | 39.03 | 48.48 | 56.23 | 62.55 | 61.32 | 57.47 | 45.58 | 23.90 | 17.68 | 39.45 | |||||||||||||
1980 | 21.10 | 26.69 | 26.58 | 36.97 | 44.39 | 53.73 | 62.00 | 58.42 | 54.40 | 43.06 | 31.93 | 28.74 | 40.67 | |||||||||||||
1981 | 27.10 | 26.36 | 31.90 | 42.33 | 46.03 | 57.87 | 61.52 | b | 61.58 | 55.73 | 40.29 | 32.63 | 23.10 | 42.20 | ||||||||||||
1982 | 17.74 | 21.25 | 31.81 | 36.33 | 47.13 | 53.87 | 61.42 | 61.80 | a | 53.77 | 37.52 | 26.40 | 23.20 | a | 39.35 | |||||||||||
1983 | 22.67 | a | 27.89 | 33.87 | 34.17 | 44.84 | 54.50 | 60.61 | 62.00 | 55.97 | 43.35 | 30.00 | 19.55 | 40.78 | ||||||||||||
1984 | 15.52 | 19.93 | 30.68 | 36.37 | 52.40 | a | 55.63 | 65.23 | 62.90 | a | 55.53 | 37.29 | 29.50 | 21.87 | 40.24 | |||||||||||
1985 | 21.55 | 20.07 | 30.65 | 43.03 | 49.81 | 59.80 | 64.79 | b | 63.74 | 49.57 | 44.23 | a | 29.87 | 23.72 | b | 41.74 | ||||||||||
1986 | 24.23 | 29.04 | 39.29 | 40.43 | b | 48.84 | 62.00 | 61.81 | 64.00 | 50.43 | 38.84 | 30.37 | 24.39 | 42.80 | ||||||||||||
1987 | 18.06 | 27.04 | 30.26 | 42.83 | 49.55 | 60.40 | 61.27 | a | 61.48 | 55.40 | 47.61 | 31.50 | 20.52 | 42.16 | ||||||||||||
1988 | 15.13 | 26.14 | 29.35 | 40.97 | 46.68 | 60.47 | 66.26 | 63.45 | 54.03 | 49.97 | 31.76 | a | 21.84 | 42.17 | ||||||||||||
1989 | 12.23 | 20.36 | 35.42 | 45.53 | 49.65 | 56.07 | 66.10 | 60.94 | 53.77 | 42.87 | 33.83 | 25.90 | a | 41.89 | ||||||||||||
1990 | 19.55 | 27.25 | 36.48 | 44.20 | 47.87 | 59.07 | 65.03 | 61.81 | 57.90 | a | 41.90 | b | 30.23 | 13.39 | 42.06 | |||||||||||
1991 | 14.58 | 27.61 | 29.42 | 36.43 | 46.16 | 56.50 | 64.68 | 63.29 | 55.63 | 46.97 | 29.63 | 19.63 | a | 40.88 | ||||||||||||
1992 | 13.97 | a | 29.07 | 36.27 | a | 46.41 | a | 52.10 | 57.55 | a | 62.00 | 64.10 | 55.93 | 47.39 | 27.27 | 17.33 | a | 42.45 | ||||||||
1993 | 22.80 | a | 22.43 | e | 35.90 | a | 39.73 | 49.69 | b | 54.96 | b | 62.68 | 59.77 | 53.43 | 41.90 | 26.55 | a | 20.73 | a | 40.88 | ||||||
1994 | 23.71 | 22.32 | 36.79 | b | 40.44 | c | 47.71 | c | 61.50 | 65.80 | a | 65.07 | d | 54.90 | 41.84 | 23.93 | a | 21.50 | c | 42.13 | ||||||
1995 | 23.03 | 34.22 | a | 33.14 | c | 37.68 | b | 43.97 | a | 52.38 | a | 61.87 | a | 64.03 | b | 54.31 | a | 41.80 | a | 30.07 | 24.59 | b | 41.76 | |||
1996 | 19.64 | c | 29.04 | c | 33.29 | 39.38 | a | 49.42 | 59.47 | 66.62 | b | 64.20 | a | 51.55 | a | 41.73 | a | 30.27 | 23.11 | d | 42.31 | |||||
1997 | 20.35 | 25.04 | c | 35.10 | b | 35.67 | c | 51.10 | a | 57.93 | a | 61.37 | a | 61.28 | b | 54.47 | 41.90 | a | 30.57 | 21.69 | b | 41.37 | ||||
1998 | 23.17 | a | 26.20 | c | 33.37 | d | 36.68 | b | 46.87 | a | 53.33 | 65.74 | 64.00 | b | 55.77 | 42.47 | a | 30.70 | 18.17 | b | 41.37 | |||||
1999 | 25.55 | b | 26.89 | 35.55 | 34.80 | 45.61 | 55.41 | a | 63.87 | 59.30 | a | 51.57 | b | 45.50 | c | 34.03 | a | 22.57 | a | 41.72 | ||||||
2000 | 25.39 | 28.82 | a | 33.90 | 43.52 | a | 49.39 | 60.03 | a | 65.07 | a | 64.10 | a | 53.03 | 43.32 | 24.33 | 22.90 | a | 42.82 | |||||||
2001 | 19.97 | a | 23.77 | b | 35.68 | 39.67 | 51.31 | b | 57.97 | a | 62.94 | 63.10 | a | 56.77 | 45.32 | 33.93 | 18.89 | c | 42.44 | |||||||
2002 | 19.32 | 21.96 | a | 28.87 | 43.33 | 48.57 | a | 60.67 | 68.90 | 62.97 | 54.52 | a | 41.10 | 30.47 | 24.00 | a | 42.06 | |||||||||
2003 | 26.43 | c | 26.15 | a | 34.35 | 37.40 | 49.60 | a | 58.67 | 70.48 | 64.57 | c | 55.17 | a | 49.07 | b | 28.73 | 22.37 | a | 43.58 | ||||||
2004 | 19.00 | 23.07 | a | 38.73 | a | 40.72 | a | 49.13 | 57.76 | a | 64.71 | 60.87 | 53.29 | b | 43.73 | a | 31.28 | a | 20.64 | c | 41.91 | |||||
2005 | 25.14 | c | 29.36 | c | 32.40 | f | 39.07 | c | 49.97 | a | 53.40 | 66.68 | 60.55 | 52.77 | 43.83 | a | 32.90 | 20.36 | c | 43.09 | a | |||||
2006 | 21.53 | a | 23.75 | 29.20 | a | 40.38 | a | 51.26 | 61.71 | b | 67.32 | 60.17 | b | 51.21 | a | 40.03 | a | 30.46 | d | 20.40 | a | 41.45 | ||||
2007 | 17.47 | a | 28.19 | a | 35.23 | a | 41.63 | 50.80 | a | 60.66 | a | 68.20 | a | 64.19 | 54.24 | a | 40.34 | b | 32.54 | b | 17.53 | a | 42.59 | |||
2008 | 15.59 | b | 24.36 | a | 29.94 | 34.93 | 44.27 | a | 57.40 | 66.87 | 64.30 | a | 53.76 | a | 43.00 | a | 35.24 | a | 18.17 | b | 40.65 | |||||
2009 | 22.29 | c | 25.39 | 32.03 | a | 37.24 | a | 51.84 | 54.63 | 65.87 | 61.03 | 56.38 | a | 38.86 | b | 31.84 | e | 14.48 | 40.99 | |||||||
2010 | 17.31 | b | 21.75 | 30.20 | a | 37.93 | 43.32 | 58.29 | b | 64.60 | a | 58.90 | b | 55.93 | b | 44.90 | 29.03 | 26.42 | 40.72 | |||||||
2011 | 17.03 | 20.89 | 32.50 | a | 35.40 | 43.77 | a | 55.47 | 62.39 | 63.32 | 56.03 | 43.68 | 28.03 | 20.03 | 39.88 | |||||||||||
2012 | 22.20 | a | 25.90 | 34.19 | 41.73 | 49.77 | 59.50 | 65.13 | 65.13 | 56.73 | 44.26 | 33.10 | 20.42 | 43.17 | ||||||||||||
2013 | 14.00 | 22.54 | 33.47 | a | 38.33 | 48.65 | 61.33 | 66.39 | 62.52 | 53.87 | 40.58 | 31.17 | 16.16 | 40.75 | ||||||||||||
2014 | 24.39 | 28.54 | 33.19 | 39.37 | 46.90 | 57.80 | 66.81 | 59.61 | 57.33 | 46.58 | 29.77 | 26.61 | 43.07 | |||||||||||||
2015 | 22.17 | a | 31.37 | a | 37.94 | 38.90 | 47.23 | 61.90 | 61.48 | 62.68 | 58.41 | a | 48.00 | b | 28.37 | 18.23 | a | 43.06 | ||||||||
2016 | 20.13 | 25.93 | 35.32 | 39.80 | 47.29 | 62.87 | 64.39 | 61.65 | 53.03 | 44.71 | 35.41 | a | 19.77 | 42.53 | ||||||||||||
2017 | 20.90 | 30.64 | 38.00 | 38.83 | 48.26 | 61.50 | 66.45 | 63.55 | 53.60 | 40.13 | 33.83 | a | 24.55 | 43.35 | ||||||||||||
2018 | 24.13 | 26.00 | 32.16 | 40.20 | 51.19 | 61.60 | 68.00 | 64.10 | 57.93 | 41.74 | 29.30 | 20.48 | 43.07 | |||||||||||||
2019 | 20.61 | 19.32 | 32.48 | 42.90 | 43.35 | 56.20 | 64.84 | 65.58 | 56.43 | 36.23 | 31.97 | 22.00 | b | 40.99 | ||||||||||||
2020 | 17.68 | 23.90 | 33.71 | 40.30 | 50.48 | 58.43 | 63.61 | 68.10 | 54.93 | a | 45.48 | 31.67 | 19.29 | 42.30 | ||||||||||||
2021 | 19.77 | 26.58 | b | 31.13 | 39.63 | 49.58 | 62.60 | 67.45 | 62.61 | 56.57 | 40.48 | 35.30 | 25.06 | 43.06 | ||||||||||||
2022 | 21.06 | 23.54 | 33.13 | 37.53 | 46.58 | 59.13 | 66.55 | 64.71 | 58.70 | 43.90 | 26.80 | 20.29 | 41.83 | |||||||||||||
2023 | 23.10 | 19.68 | 27.10 | 36.17 | 51.45 | 56.00 | 67.97 | 63.26 | 55.63 | 44.97 | 32.33 | 24.00 | 41.80 | |||||||||||||
2024 | 26.16 | 28.34 | 32.94 | 40.86 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.15 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.30 | 24.40 | 31.72 | 38.65 | 47.44 | 56.48 | 63.71 | 61.68 | 53.87 | 43.06 | 30.24 | 20.89 | 41.21 | |||||||||||||
S.D. | 4.04 | 4.32 | 3.59 | 3.02 | 2.77 | 3.40 | 2.44 | 2.38 | 2.55 | 3.26 | 2.96 | 3.25 | 1.29 | |||||||||||||
SKEW | -0.33 | -0.68 | -0.07 | 0.20 | -0.15 | -0.06 | 0.38 | -0.21 | -0.62 | 0.04 | -0.23 | -0.21 | -0.23 | |||||||||||||
MAX | 27.10 | 34.22 | 39.29 | 46.41 | 52.40 | 62.87 | 70.48 | 68.10 | 58.70 | 51.48 | 35.90 | 28.74 | 43.58 | |||||||||||||
MIN | 9.71 | 10.82 | 22.42 | 31.60 | 40.92 | 49.36 | 59.00 | 54.35 | 46.03 | 34.71 | 23.23 | 12.26 | 38.22 | |||||||||||||
YRS | 82 | 84 | 80 | 81 | 84 | 83 | 84 | 84 | 84 | 79 | 75 | 82 | 67 |