YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.10 | a | 31.10 | k |
1939 | 34.23 | 31.71 | 32.84 | 35.57 | 39.00 | 42.37 | 45.24 | b | 43.35 | 42.27 | 39.61 | 34.17 | 37.58 | 38.16 | ||||||||||||
1940 | 31.55 | 36.10 | 36.03 | 37.03 | 40.06 | 42.27 | 46.61 | 43.97 | 47.10 | 42.84 | 33.07 | 31.39 | 39.00 | |||||||||||||
1941 | 34.30 | a | 32.57 | 33.35 | 36.33 | 41.65 | 44.80 | 47.32 | 47.74 | 43.03 | 38.61 | 36.60 | 33.52 | 39.15 | ||||||||||||
1942 | 27.42 | 32.11 | 30.39 | 35.07 | 39.26 | 42.97 | 48.29 | 44.74 | 38.93 | 36.61 | 35.77 | 33.90 | 37.12 | |||||||||||||
1943 | 25.70 | a | 29.18 | 31.81 | 37.23 | 36.52 | 41.30 | 42.45 | 42.61 | 40.00 | 40.19 | 33.13 | 27.97 | a | 35.67 | |||||||||||
1944 | 27.90 | 30.66 | 30.39 | 35.37 | 38.50 | a | 43.27 | 43.77 | 42.68 | 42.67 | 39.81 | 33.03 | 29.00 | 36.42 | ||||||||||||
1945 | 31.74 | 33.86 | 32.65 | 34.93 | 41.29 | 40.73 | 42.45 | 43.71 | 39.87 | 35.10 | 35.67 | 32.06 | 37.00 | |||||||||||||
1946 | 30.48 | 31.68 | 32.48 | 33.53 | 37.84 | 42.33 | 44.90 | 42.55 | 38.97 | 33.94 | 31.03 | 31.23 | 35.91 | |||||||||||||
1947 | 25.29 | 31.32 | 32.61 | 35.23 | 38.23 | 42.27 | 45.29 | 41.58 | 40.50 | 42.23 | 35.67 | 32.10 | 36.86 | |||||||||||||
1948 | 27.26 | 27.17 | 30.13 | 34.43 | 40.47 | a | 45.33 | 43.03 | 45.65 | 39.00 | 35.32 | 31.67 | 27.93 | b | 35.62 | |||||||||||
1949 | 14.39 | 27.32 | 31.93 | b | 32.62 | a | 38.48 | b | 39.93 | ----- | z | 44.29 | 39.50 | b | 31.17 | a | 35.40 | 30.29 | 33.21 | a | ||||||
1950 | ----- | z | 26.96 | b | 32.73 | a | 33.37 | ----- | z | 44.70 | 43.00 | 42.71 | 37.73 | 39.29 | 34.97 | 38.23 | a | 37.37 | b | |||||||
1951 | 28.77 | 29.96 | 27.35 | 31.07 | 36.58 | 39.10 | 40.06 | 36.29 | 35.80 | 34.40 | a | 29.13 | 27.58 | 33.01 | ||||||||||||
1952 | ----- | z | 25.71 | l | 30.27 | a | 32.72 | a | 36.52 | 41.40 | 41.06 | 42.37 | a | 37.23 | 34.26 | 23.13 | 31.65 | 35.06 | b | |||||||
1953 | 38.43 | a | 31.50 | 30.84 | 33.69 | a | 38.87 | 41.27 | 43.42 | 46.42 | 42.70 | 38.35 | 38.40 | 34.03 | 38.16 | |||||||||||
1954 | 31.13 | 32.04 | 27.61 | 32.87 | 38.26 | 42.93 | 43.55 | 46.39 | 41.67 | 36.10 | 38.33 | 31.87 | 36.89 | |||||||||||||
1955 | 29.87 | 28.93 | 29.55 | 32.20 | 36.70 | a | 43.70 | 45.65 | 42.84 | 42.66 | a | 40.23 | 33.59 | a | 30.94 | 36.40 | ||||||||||
1956 | 32.06 | 27.76 | 31.73 | a | 34.33 | 41.68 | 43.07 | 46.87 | 46.06 | 41.90 | 37.90 | 29.90 | 31.97 | a | 37.10 | |||||||||||
1957 | 24.23 | 32.18 | 35.48 | 36.33 | 42.97 | 44.53 | 43.81 | 43.97 | 44.47 | 39.29 | 30.40 | 33.65 | 37.61 | |||||||||||||
1958 | 34.32 | 39.64 | 30.23 | 36.53 | 42.32 | 49.03 | 48.00 | 47.10 | 43.40 | 37.61 | 37.50 | 37.39 | 40.26 | |||||||||||||
1959 | 35.35 | 32.46 | 33.42 | 35.40 | 38.03 | 44.97 | 44.13 | 41.45 | 39.93 | 37.48 | 28.93 | b | 28.35 | 36.66 | ||||||||||||
1960 | 26.60 | a | 29.93 | 33.26 | 37.00 | 39.06 | 42.77 | 45.06 | 45.77 | 42.43 | 39.00 | 33.97 | 28.97 | 36.99 | ||||||||||||
1961 | 32.90 | 37.29 | 35.84 | 35.10 | 41.26 | 45.80 | 46.52 | 48.00 | 39.23 | 37.42 | 30.67 | 33.03 | 38.59 | |||||||||||||
1962 | 27.45 | 30.32 | 31.52 | 36.62 | a | 40.13 | 41.23 | 44.52 | 46.06 | 43.23 | 38.16 | 37.08 | e | 31.50 | k | 37.85 | a | |||||||||
1963 | 24.36 | i | 37.11 | j | 32.19 | d | 34.00 | b | 39.58 | 45.07 | 45.45 | 47.16 | 46.93 | a | 40.19 | 37.93 | 31.29 | 39.98 | b | |||||||
1964 | 33.58 | 29.24 | 32.61 | 33.33 | 36.65 | 44.13 | 46.55 | 46.26 | 40.50 | 37.58 | 31.48 | a | 32.16 | 37.01 | ||||||||||||
1965 | 32.52 | 31.21 | 28.55 | 35.47 | 35.94 | 40.73 | 44.90 | 46.35 | 38.00 | a | 39.26 | 35.77 | 25.96 | c | 36.22 | |||||||||||
1966 | 28.13 | 28.00 | 30.20 | a | 34.43 | 37.29 | 41.59 | a | 44.87 | a | 43.32 | 43.97 | 38.52 | 36.40 | 35.47 | a | 36.85 | |||||||||
1967 | 34.65 | 31.11 | 32.00 | 31.13 | 37.48 | 46.37 | 45.57 | a | 46.71 | 42.73 | 39.10 | 33.97 | a | 29.34 | b | 37.51 | ||||||||||
1968 | 29.40 | a | 33.21 | 37.10 | 33.37 | 40.77 | 44.57 | 47.42 | 49.45 | 45.03 | 38.87 | a | 37.03 | 31.77 | a | 39.00 | ||||||||||
1969 | 27.58 | 29.56 | a | 29.76 | b | 35.79 | a | 41.73 | a | 50.20 | 46.35 | 43.32 | 43.37 | 35.52 | 32.10 | 33.13 | 37.37 | |||||||||
1970 | 32.70 | a | 31.77 | b | 33.13 | a | 32.34 | a | 37.70 | d | 46.19 | c | 44.71 | 43.16 | 37.70 | 35.68 | 36.75 | b | 31.70 | a | 36.96 | |||||
1971 | 30.87 | a | 30.35 | b | 31.61 | 33.41 | a | 40.90 | 43.13 | 47.45 | 46.94 | 38.68 | e | 37.61 | 34.27 | 31.42 | 37.22 | |||||||||
1972 | 29.97 | 33.00 | a | 36.10 | 33.47 | 40.33 | a | 44.03 | 46.55 | 45.07 | b | 37.00 | a | 32.13 | a | 33.13 | 24.79 | c | 36.30 | |||||||
1973 | 25.38 | b | 28.73 | f | 33.00 | d | 33.62 | d | 40.46 | e | 45.54 | d | 46.85 | d | 44.21 | c | 44.93 | 39.20 | a | 34.87 | 35.55 | 38.51 | a | |||
1974 | 27.58 | 31.30 | a | 33.81 | 36.04 | c | 39.72 | b | 45.67 | 48.30 | d | 47.83 | a | 43.29 | b | 36.13 | a | 35.61 | b | 33.73 | a | 38.25 | ||||
1975 | 33.69 | b | 32.15 | b | 31.42 | 31.50 | b | 39.07 | a | 44.76 | a | 49.90 | 47.17 | b | 42.34 | a | 41.89 | c | 33.86 | a | 33.62 | b | 38.45 | |||
1976 | 31.58 | 29.29 | a | 30.40 | a | 34.43 | b | 39.17 | b | 40.39 | g | 47.57 | a | 48.86 | c | 46.16 | e | 35.96 | g | 35.70 | j | 29.31 | e | 37.42 | c | |
1977 | 26.79 | c | 32.17 | d | 31.87 | a | 35.52 | c | 38.69 | b | 46.52 | c | 47.18 | c | 52.45 | 44.15 | j | 35.83 | b | 32.96 | g | 36.52 | d | 38.35 | b | |
1978 | 34.10 | 33.89 | 33.96 | e | 34.48 | e | 38.28 | f | 46.76 | m | 48.62 | r | 47.84 | 45.79 | b | 35.27 | a | 25.56 | e | 30.20 | k | 36.36 | d | |||
1979 | 21.83 | h | 31.42 | b | 33.77 | 36.91 | g | ----- | z | 41.62 | i | 45.40 | f | 45.84 | f | 47.71 | w | 40.66 | b | 29.62 | f | 34.62 | b | 35.12 | h | |
1980 | 23.19 | e | 31.96 | f | 33.21 | b | 36.04 | f | 39.21 | c | 43.92 | f | 47.19 | e | 43.62 | b | 44.86 | h | 43.04 | g | 41.35 | j | 34.21 | g | 37.29 | g |
1981 | 32.86 | b | 32.50 | b | 32.75 | g | 36.22 | c | 39.41 | i | 45.00 | d | 46.23 | e | 48.25 | c | 44.32 | h | 41.62 | g | 34.00 | l | 38.29 | q | 40.18 | f |
1982 | 33.21 | l | 35.44 | j | 35.71 | n | 39.94 | l | 45.88 | n | 49.90 | i | 51.27 | p | 54.25 | o | 50.80 | j | 47.35 | k | 32.88 | d | 29.20 | k | 32.88 | k |
1983 | 34.23 | a | 35.30 | e | 38.17 | b | 34.03 | 40.82 | c | 45.28 | a | 49.14 | c | 48.43 | c | 41.23 | 38.00 | a | 38.05 | h | 29.91 | i | 40.46 | b | ||
1984 | 27.96 | h | 32.38 | c | 35.70 | a | 35.57 | b | 38.69 | b | 42.93 | c | 44.89 | c | 46.21 | c | 43.56 | c | 40.00 | e | 35.65 | j | 30.04 | e | 39.00 | b |
1985 | 26.56 | f | 28.17 | d | 30.03 | b | 37.04 | c | 39.45 | 42.64 | b | 48.23 | 44.67 | g | 41.08 | e | 36.93 | b | 26.27 | h | 26.00 | c | 36.62 | c | ||
1986 | 33.72 | m | 33.41 | f | 36.20 | f | 34.67 | f | 40.77 | e | 45.97 | a | 44.71 | c | 46.35 | k | 41.43 | i | 39.77 | e | 35.83 | g | 30.30 | d | 40.30 | g |
1987 | 29.83 | g | 33.70 | h | 33.83 | h | 37.03 | 41.31 | b | 47.04 | g | 47.24 | f | 46.50 | e | 44.67 | c | 38.32 | c | 35.44 | n | 30.79 | b | 39.77 | f | |
1988 | 29.59 | b | 31.07 | a | 32.42 | 36.52 | a | 39.39 | 44.55 | a | 47.19 | 45.26 | h | 43.30 | g | 43.22 | h | 38.17 | a | 32.00 | a | 36.77 | c | |||
1989 | 32.75 | k | 25.25 | 35.34 | b | 39.89 | c | 41.16 | 46.46 | f | 47.63 | d | 49.00 | i | 44.00 | e | 37.72 | m | 37.50 | b | 31.63 | a | 37.80 | d | ||
1990 | 34.12 | e | 29.16 | c | 33.85 | k | 38.84 | k | 38.74 | h | 45.33 | o | 50.79 | c | 51.15 | d | 47.83 | f | 38.23 | 37.04 | b | 24.90 | a | 37.91 | e | |
1991 | 29.73 | a | 37.15 | a | 33.00 | d | 36.63 | 41.00 | b | 44.60 | 49.45 | b | 50.93 | d | 45.79 | a | 38.96 | e | 40.05 | h | 34.96 | e | 40.20 | a | ||
1992 | 35.18 | c | 37.36 | a | 36.00 | b | 41.08 | f | 42.24 | n | 45.46 | q | 48.77 | r | 47.86 | j | 42.75 | j | 41.04 | e | 37.81 | d | 31.71 | j | 37.48 | g |
1993 | 28.29 | c | 29.67 | d | 34.68 | i | 38.57 | g | 44.14 | j | 45.79 | b | 48.00 | d | 49.13 | a | 43.75 | b | 40.25 | c | 28.27 | d | 31.58 | e | 38.30 | c |
1994 | 34.30 | d | 31.65 | e | 33.65 | k | 38.65 | d | 41.96 | f | 43.33 | c | 49.04 | h | 47.67 | j | 45.57 | g | 38.53 | a | 31.62 | d | 33.28 | f | 36.35 | f |
1995 | 31.88 | w | 34.35 | h | 31.33 | g | 35.12 | d | 42.68 | c | 46.24 | e | 51.69 | b | 46.93 | a | 49.38 | f | 37.12 | e | 40.39 | g | 32.17 | m | 43.30 | f |
1996 | 32.96 | f | 29.38 | h | 34.46 | g | 36.89 | k | 39.46 | e | 44.07 | c | 51.31 | b | 50.13 | 43.32 | b | 40.15 | d | 36.00 | a | 33.00 | e | 42.18 | d | |
1997 | 31.83 | b | 32.78 | a | 34.10 | 35.80 | 44.70 | a | 46.20 | 49.13 | 50.84 | 48.67 | 40.80 | a | 39.53 | 30.65 | 40.42 | |||||||||
1998 | 36.88 | g | 35.32 | c | 30.07 | d | 32.90 | a | 41.62 | g | 45.41 | c | 51.04 | e | 47.36 | c | 44.83 | a | 37.65 | e | 36.15 | c | 28.97 | a | 38.97 | b |
1999 | 33.38 | e | 32.75 | 33.50 | c | 34.53 | 38.48 | b | 44.92 | d | 48.00 | d | 51.59 | d | 40.93 | c | 37.56 | d | 39.48 | c | 32.57 | j | 39.56 | a | ||
2000 | 31.32 | f | 34.42 | e | 32.61 | c | 37.63 | k | 41.68 | c | 44.63 | 46.19 | d | 47.10 | b | 45.22 | c | 38.21 | c | 31.36 | e | 31.00 | h | 40.16 | c | |
2001 | 32.41 | d | 30.57 | 35.10 | 34.79 | a | 39.97 | 44.00 | 49.37 | a | 47.87 | 45.17 | 38.71 | 38.56 | c | 33.50 | a | 39.17 | ||||||||
2002 | 32.96 | d | 30.85 | b | 32.13 | a | 37.53 | 40.48 | 47.20 | 50.97 | 49.13 | 46.00 | 39.70 | a | 38.13 | 36.59 | b | 40.14 | ||||||||
2003 | 37.41 | d | 34.57 | 39.14 | b | 38.80 | 43.45 | 49.24 | a | 52.42 | 52.66 | b | 49.33 | 46.39 | 36.56 | c | ----- | z | 43.63 | a | ||||||
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.59 | i | 33.30 | 32.26 | 32.78 | j | ||
2006 | 35.94 | ----- | z | 32.39 | 36.26 | c | 35.33 | v | ----- | z | 50.74 | 47.87 | a | 43.62 | f | 36.48 | 37.13 | 31.42 | 38.53 | d | ||||||
2007 | 27.90 | 33.75 | 34.54 | e | 35.87 | 39.42 | 44.45 | h | 52.32 | 48.87 | 44.07 | 39.77 | ----- | z | ----- | z | 39.61 | c | ||||||||
2008 | 28.45 | 31.17 | 31.61 | 32.93 | 42.10 | 42.77 | 48.77 | 50.23 | 43.57 | 39.03 | 38.70 | 29.58 | 38.24 | |||||||||||||
2009 | 30.35 | 30.36 | 32.39 | 34.47 | 40.32 | 48.60 | 50.97 | 50.19 | 46.37 | 39.10 | 34.57 | 27.07 | a | 38.73 | ||||||||||||
2010 | 37.45 | 34.46 | 32.71 | 35.00 | 39.26 | 45.13 | 47.94 | 48.10 | 47.37 | 41.29 | 35.23 | 34.74 | 39.89 | |||||||||||||
2011 | 33.19 | 29.61 | 34.13 | 33.17 | 38.90 | 45.53 | 48.35 | 49.42 | 47.63 | 42.87 | 33.43 | 29.00 | 38.77 | |||||||||||||
2012 | 33.84 | 32.21 | 31.97 | 37.77 | 39.90 | 41.70 | t | 50.37 | a | 49.61 | 45.13 | 41.45 | b | 38.56 | c | 34.00 | d | 39.53 | a | |||||||
2013 | 29.84 | 34.07 | 34.32 | 37.93 | 44.26 | 46.67 | 49.35 | 52.94 | 49.50 | 37.97 | 35.63 | 27.32 | 39.98 | |||||||||||||
2014 | 32.42 | 32.68 | 37.16 | 37.90 | 43.71 | 46.40 | 52.48 | 52.97 | 48.20 | 46.16 | 36.07 | 34.84 | 41.75 | |||||||||||||
2015 | 35.90 | 35.29 | 37.13 | 35.37 | 44.23 | 49.43 | 52.13 | 51.35 | 44.93 | 45.35 | 35.30 | 36.03 | 41.87 | |||||||||||||
2016 | 30.74 | 36.03 | 35.00 | 39.50 | 43.10 | 46.43 | 49.42 | 48.94 | 42.97 | 43.71 | 40.77 | 30.23 | 40.57 | |||||||||||||
2017 | 26.47 | a | 32.61 | 34.68 | 35.33 | 43.16 | 48.27 | 49.06 | 51.52 | 48.20 | 40.10 | 38.00 | 31.39 | 39.90 | ||||||||||||
2018 | 35.74 | 33.43 | 33.19 | 37.87 | 44.65 | 45.53 | 50.74 | 50.71 | 43.43 | 41.13 | 34.90 | 35.45 | 40.56 | |||||||||||||
2019 | 33.32 | 28.54 | 30.65 | 39.50 | 43.48 | 46.27 | 50.90 | 51.43 | a | 47.93 | 37.78 | v | 34.87 | 34.71 | 40.15 | a | ||||||||||
2020 | 36.26 | 31.59 | 32.13 | 37.07 | 43.16 | 47.80 | 51.00 | 48.88 | o | 47.71 | w | 40.90 | 34.97 | 34.55 | 38.94 | b | ||||||||||
2021 | 37.57 | q | 33.00 | v | 32.00 | 35.07 | 41.97 | 50.00 | o | 50.85 | e | 49.00 | k | 45.28 | a | 40.58 | 40.33 | 33.16 | 39.90 | d | ||||||
2022 | 32.00 | 30.50 | 35.87 | 33.89 | c | 40.65 | 47.93 | 52.13 | 52.65 | 49.67 | 43.97 | 30.60 | 31.90 | b | 40.15 | |||||||||||
2023 | 32.76 | f | 31.75 | h | 31.17 | h | 36.27 | 44.68 | 45.53 | 49.84 | 53.10 | 47.27 | 42.68 | 36.93 | 37.65 | 43.77 | c | |||||||||
2024 | 34.61 | 35.14 | 34.26 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.67 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.09 | 31.84 | 32.87 | 35.26 | 40.26 | 44.64 | 47.44 | 47.15 | 43.28 | 38.91 | 34.76 | 31.89 | 38.09 | |||||||||||||
S.D. | 4.03 | 2.70 | 2.35 | 1.97 | 2.20 | 2.34 | 2.93 | 3.41 | 3.33 | 2.85 | 3.36 | 3.06 | 1.81 | |||||||||||||
SKEW | -1.09 | 0.28 | 0.22 | 0.14 | 0.21 | 0.05 | -0.19 | -0.31 | -0.14 | 0.11 | -0.91 | -0.16 | -0.04 | |||||||||||||
MAX | 38.43 | 39.64 | 39.14 | 39.89 | 44.70 | 50.20 | 52.48 | 53.10 | 49.67 | 46.39 | 40.77 | 38.23 | 41.87 | |||||||||||||
MIN | 14.39 | 25.25 | 27.35 | 31.07 | 35.94 | 39.10 | 40.06 | 36.29 | 35.80 | 31.17 | 23.13 | 24.79 | 33.01 | |||||||||||||
YRS | 68 | 72 | 74 | 74 | 72 | 70 | 76 | 73 | 70 | 76 | 71 | 72 | 45 |