YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.15 | 67.75 | b | 56.38 | b | 44.04 | b | 33.29 | c | 55.32 | g | |
1942 | 30.82 | k | 30.29 | i | 40.07 | h | 53.69 | d | 61.52 | a | 68.89 | b | 76.10 | 73.77 | 63.43 | b | 53.50 | e | 43.52 | j | 31.57 | j | 64.41 | e | ||
1943 | 31.86 | j | 39.14 | f | 39.45 | l | 56.66 | a | 58.59 | d | 73.20 | c | 78.82 | a | 79.26 | 65.26 | c | 51.27 | e | 40.76 | i | 27.30 | i | 66.15 | e | |
1944 | 27.55 | k | 34.27 | g | 37.96 | h | 46.65 | f | 63.02 | c | 71.65 | c | 74.82 | 76.13 | 66.48 | f | 55.26 | f | 42.48 | g | 30.35 | h | 71.40 | h | ||
1945 | 30.73 | i | 34.08 | h | 45.77 | i | 48.39 | g | 63.38 | e | 66.67 | 76.98 | b | 76.19 | b | 66.35 | d | 55.50 | 43.67 | c | 27.00 | g | 64.11 | e | ||
1946 | 32.54 | g | 39.14 | c | 48.40 | g | 60.28 | c | 59.28 | b | 74.07 | a | 78.11 | 75.43 | a | 67.43 | 54.29 | c | 31.71 | f | 37.38 | b | 60.60 | c | ||
1947 | 31.24 | f | 31.75 | h | 42.02 | g | 50.79 | b | 61.65 | e | 70.11 | b | 77.74 | 79.15 | a | 71.70 | b | 60.65 | a | 36.40 | e | 31.52 | k | 63.52 | d | |
1948 | 26.82 | i | 24.68 | l | 33.37 | h | 58.41 | b | 64.52 | f | 72.57 | c | 77.57 | b | 76.35 | 71.47 | a | 56.38 | b | 37.85 | 33.45 | a | 60.51 | d | ||
1949 | 19.56 | g | 32.62 | 43.52 | 53.72 | 64.50 | 71.25 | 78.26 | 75.32 | 68.25 | 55.14 | b | 49.72 | a | 33.92 | a | 56.93 | a | ||||||||
1950 | 31.77 | a | 40.50 | a | 42.33 | a | 52.23 | 61.81 | b | 75.87 | d | 73.84 | 72.68 | a | 65.62 | 61.23 | a | 39.73 | 35.08 | 54.39 | ||||||
1951 | 28.20 | c | 38.12 | b | 39.15 | 48.78 | 62.90 | b | 67.17 | a | 79.40 | 77.18 | a | 66.75 | d | 54.74 | 38.75 | 33.44 | d | 52.88 | ||||||
1952 | 35.53 | 37.53 | 39.66 | 53.11 | b | 62.98 | 81.12 | 80.48 | 78.26 | 69.30 | 54.50 | 36.53 | 31.77 | 55.07 | ||||||||||||
1953 | 40.97 | b | 36.46 | 48.60 | a | 48.96 | b | 61.06 | 78.05 | 81.87 | 77.15 | 70.55 | 57.82 | 42.55 | b | 30.44 | d | 56.21 | ||||||||
1954 | 31.40 | b | 44.91 | 39.98 | b | 57.83 | a | 60.82 | 77.97 | 81.92 | 77.53 | 72.93 | 55.32 | 44.32 | 36.02 | b | 56.75 | |||||||||
1955 | 31.40 | 29.73 | 44.58 | 55.08 | 64.40 | 71.17 | 81.68 | 77.31 | 70.36 | b | 57.03 | b | 36.63 | 31.28 | b | 54.22 | ||||||||||
1956 | 34.48 | b | 29.61 | a | 44.71 | 52.10 | 67.08 | 78.37 | 77.27 | 75.05 | 69.83 | 57.52 | 37.95 | 33.79 | b | 54.81 | ||||||||||
1957 | 26.77 | 42.36 | 43.05 | 49.83 | 60.22 | a | 71.15 | 79.29 | 77.32 | 65.48 | 56.05 | 40.47 | 41.08 | 54.42 | ||||||||||||
1958 | 33.40 | 37.80 | 34.79 | b | 50.95 | 67.48 | 75.38 | a | 76.18 | 77.92 | 70.82 | 56.39 | 41.77 | 35.97 | 54.90 | |||||||||||
1959 | 28.69 | 34.80 | 44.11 | 52.57 | 65.50 | 75.62 | 76.63 | 77.56 | 66.38 | 52.74 | 40.02 | 36.42 | 54.25 | |||||||||||||
1960 | 24.40 | 21.71 | 36.89 | 58.10 | 62.82 | 73.33 | 76.23 | a | 78.42 | a | 68.68 | 56.24 | 43.53 | 28.18 | 52.38 | |||||||||||
1961 | 30.61 | 37.61 | 44.50 | b | 51.87 | 64.12 | a | 72.38 | b | 75.82 | 75.73 | 64.03 | 55.15 | a | 38.90 | 29.72 | a | 53.37 | ||||||||
1962 | 22.57 | a | 39.64 | 41.02 | 56.70 | 68.13 | 71.50 | a | 77.05 | 77.37 | 67.50 | 58.24 | 42.89 | b | 36.39 | 54.92 | ||||||||||
1963 | 23.74 | 40.52 | 46.47 | 57.20 | 67.16 | 76.52 | 81.79 | 77.16 | 72.33 | 63.65 | 44.48 | a | 27.77 | 56.57 | ||||||||||||
1964 | 34.48 | a | 32.22 | 40.40 | 52.77 | 65.44 | 72.93 | 81.73 | 76.52 | 68.10 | 55.66 | 42.67 | a | 34.42 | 54.78 | |||||||||||
1965 | 38.21 | 33.95 | 34.40 | 57.83 | 65.10 | 71.31 | a | 78.79 | 73.71 | 64.13 | 58.10 | 47.50 | 33.68 | 54.73 | ||||||||||||
1966 | 23.29 | b | 27.39 | 47.27 | 53.10 | 65.15 | 74.83 | 82.48 | 74.42 | 68.18 | 56.11 | 44.25 | 30.88 | a | 53.95 | |||||||||||
1967 | 35.37 | 39.21 | 49.95 | 59.87 | 61.69 | 71.75 | 77.92 | 74.52 | 67.58 | 59.66 | 43.12 | 31.19 | 55.99 | |||||||||||||
1968 | 32.60 | a | 37.74 | 44.97 | 51.30 | 57.56 | 74.05 | 76.22 | a | 73.17 | a | 65.66 | a | 55.95 | 39.93 | 27.06 | 53.02 | |||||||||
1969 | 33.81 | b | 36.73 | 31.89 | 56.26 | a | 64.13 | 68.31 | a | 78.70 | a | 77.68 | 67.95 | a | 47.87 | 41.83 | a | 34.53 | 53.31 | |||||||
1970 | 28.58 | 38.39 | 35.26 | 49.33 | a | 64.40 | 70.63 | 77.82 | 78.08 | 65.21 | a | 48.82 | 40.85 | 34.76 | 52.68 | |||||||||||
1971 | 28.76 | 35.21 | 42.47 | a | 52.43 | 59.50 | 75.03 | 74.72 | a | 74.02 | a | 62.02 | a | 53.37 | a | 40.90 | 33.12 | a | 52.63 | |||||||
1972 | 28.43 | b | 37.16 | 47.34 | 54.45 | 62.43 | a | 74.22 | 76.23 | 74.76 | 66.15 | 53.12 | b | 30.18 | 22.05 | 52.21 | ||||||||||
1973 | 26.52 | a | 34.70 | 43.07 | c | 46.27 | 59.34 | ----- | z | ----- | z | ----- | z | 62.75 | 55.69 | 41.43 | b | 29.34 | f | 46.22 | d | |||||
1974 | 21.66 | 36.14 | g | 47.12 | a | 56.78 | 68.10 | 74.63 | 81.95 | 74.18 | 65.05 | a | 59.05 | 44.41 | c | 30.24 | j | 59.29 | b | |||||||
1975 | 31.07 | h | 36.21 | i | 43.50 | g | 52.43 | 63.15 | 72.00 | 78.02 | 78.05 | 67.55 | a | 57.47 | a | 39.84 | k | 37.30 | a | 63.25 | d | |||||
1976 | 31.53 | b | 43.83 | 44.89 | 56.87 | 61.72 | a | 72.92 | 79.13 | a | 76.15 | 68.23 | 52.43 | b | 40.71 | f | 34.39 | d | 56.55 | a | ||||||
1977 | 24.93 | b | 40.10 | d | 43.96 | d | 56.45 | 66.00 | a | 75.28 | a | 81.23 | 77.24 | 72.27 | 57.50 | 43.78 | ----- | z | 58.07 | a | ||||||
1978 | 24.73 | k | 27.21 | k | 47.38 | k | 58.04 | d | 61.68 | 74.07 | 81.52 | c | 75.44 | 69.71 | i | 56.88 | o | 40.61 | l | 33.30 | p | 70.15 | g | |||
1979 | 20.76 | j | 35.78 | j | 48.31 | m | 56.52 | d | 61.31 | b | 73.17 | 79.92 | 76.15 | 71.28 | 60.48 | d | 37.39 | k | 37.71 | n | 68.40 | e | ||||
1980 | ----- | z | 38.61 | j | 43.81 | m | 50.59 | h | 60.98 | 76.84 | a | 83.13 | 80.74 | 70.26 | e | 53.82 | l | 38.69 | n | 41.97 | n | 74.39 | g | |||
1981 | 38.35 | k | 37.12 | k | 46.75 | m | 61.90 | 63.48 | 78.10 | 79.76 | 75.42 | 69.90 | e | 56.52 | k | 47.16 | k | 34.03 | m | 71.43 | f | |||||
1982 | 32.75 | m | 27.40 | m | 45.35 | k | 52.65 | m | 60.53 | o | 68.82 | k | 77.31 | j | ----- | z | 68.89 | u | 52.38 | k | 38.21 | k | 31.82 | k | ----- | z |
1983 | 31.05 | j | 34.11 | j | ----- | z | ----- | z | 58.98 | g | 68.09 | h | 80.11 | m | 80.54 | h | 68.37 | k | 54.07 | p | 41.39 | k | 17.29 | j | ----- | z |
1984 | 21.31 | m | 36.95 | i | 39.75 | i | 47.33 | c | 63.36 | b | 73.12 | b | 78.52 | a | 76.72 | b | 67.86 | i | 50.84 | i | 42.11 | k | 33.32 | n | 67.81 | g |
1985 | 25.03 | l | 27.55 | i | 46.57 | j | 57.31 | f | 63.98 | f | 70.35 | g | 77.38 | j | 76.06 | g | 67.90 | i | 51.10 | j | 39.00 | k | 27.07 | j | ----- | z |
1986 | 39.50 | j | 36.21 | i | 48.71 | j | 57.61 | h | 64.40 | k | 73.17 | i | 78.59 | i | 74.40 | k | 66.04 | g | 56.43 | j | 42.19 | n | 31.62 | k | ----- | z |
1987 | 35.84 | l | 40.66 | i | 41.52 | j | 52.88 | i | 64.61 | l | 73.91 | m | 79.33 | k | 74.95 | k | 66.13 | k | 54.48 | j | 42.89 | l | 29.02 | j | ----- | z |
1988 | 18.63 | l | 32.50 | j | 41.00 | h | 51.47 | l | 63.55 | l | 75.72 | l | 77.92 | l | 78.85 | h | 65.50 | i | 54.75 | k | 43.48 | j | 32.62 | j | ----- | z |
1989 | 33.13 | l | 24.24 | i | 47.34 | c | 54.32 | b | 63.26 | d | 68.04 | c | 77.53 | a | 73.73 | c | 65.13 | d | 53.75 | a | 41.70 | 24.53 | b | 56.93 | b | |
1990 | 28.52 | c | 30.70 | a | 41.41 | c | 53.30 | b | 57.90 | b | 74.95 | b | 74.60 | a | 73.29 | 69.55 | 51.39 | 42.98 | 23.76 | 51.86 | ||||||
1991 | 25.16 | b | 38.64 | 42.28 | a | 51.60 | a | 63.00 | 74.21 | a | 75.94 | f | 76.26 | h | 67.00 | j | 56.90 | j | 35.97 | o | 32.11 | l | 49.15 | f | ||
1992 | 31.24 | h | 39.52 | c | 46.09 | b | 55.70 | e | 63.83 | g | 66.28 | g | 75.26 | j | 66.97 | k | 67.56 | l | 53.67 | k | 33.76 | k | 22.64 | i | 47.10 | i |
1993 | 21.47 | l | 28.08 | i | 42.41 | i | 50.65 | j | 61.08 | l | 71.70 | h | 75.92 | g | 73.64 | i | 60.79 | f | 53.48 | j | 33.82 | k | 31.76 | h | ----- | z |
1994 | 30.98 | i | 28.71 | g | 44.11 | h | 52.35 | j | 63.85 | k | 75.43 | i | 74.85 | k | 76.69 | g | 65.62 | i | 55.68 | l | 41.25 | j | 37.05 | j | ----- | z |
1995 | 34.45 | k | 40.94 | j | 41.41 | i | 48.62 | j | 56.64 | j | 69.55 | i | 73.74 | h | 78.57 | h | 64.47 | j | 52.71 | j | 41.10 | j | 34.95 | l | ----- | z |
1996 | 29.85 | k | 33.97 | j | 37.24 | j | 55.33 | j | 65.57 | j | 73.53 | k | 74.07 | i | 72.32 | i | 63.83 | j | 53.98 | j | 41.00 | k | 32.59 | c | 32.59 | k |
1997 | 30.02 | b | 35.36 | 46.38 | c | 46.67 | 61.52 | c | 73.40 | 79.77 | 75.23 | 68.95 | a | 52.94 | e | 39.22 | c | 30.10 | e | 53.30 | ||||||
1998 | 33.05 | 39.46 | b | 39.62 | b | 50.64 | a | 65.89 | 71.25 | d | 78.41 | b | 73.75 | c | 72.09 | c | 56.16 | b | 43.61 | c | 30.09 | b | 54.50 | |||
1999 | 35.12 | e | 42.05 | 42.59 | b | 51.16 | a | 60.43 | c | 70.62 | 78.77 | a | 76.03 | 64.37 | 52.82 | a | 46.57 | 34.42 | 54.58 | |||||||
2000 | 33.71 | 38.90 | 43.85 | a | 54.29 | b | 65.34 | b | 73.87 | d | 79.13 | a | 80.55 | 68.84 | b | 57.71 | g | 33.44 | d | 27.70 | a | 54.51 | a | |||
2001 | 27.22 | b | 29.84 | 42.02 | e | 54.33 | a | 60.91 | b | 72.48 | b | 82.02 | b | 78.12 | b | 67.54 | f | 53.09 | b | 43.10 | 32.39 | 52.32 | a | |||
2002 | 29.26 | d | 33.07 | a | 38.61 | d | 55.21 | b | 63.38 | e | 79.59 | c | 82.07 | c | 77.65 | 66.69 | c | 50.68 | 41.81 | d | 33.40 | a | 54.29 | |||
2003 | 35.58 | a | 31.78 | a | 45.39 | 55.81 | a | 64.19 | d | 70.59 | c | 82.24 | 79.79 | c | 65.69 | d | 59.06 | e | 41.87 | g | 34.67 | b | 56.80 | a | ||
2004 | 32.87 | a | 33.94 | c | 50.93 | a | 53.29 | a | 67.34 | b | 71.02 | a | 74.77 | 72.08 | a | 69.80 | 56.30 | c | 40.02 | b | 34.61 | d | 54.75 | |||
2005 | 33.12 | c | 36.74 | c | 44.34 | b | 52.83 | c | 61.93 | b | 73.87 | g | 80.14 | b | 76.75 | c | 72.31 | a | 56.58 | 44.48 | 32.50 | a | 53.79 | a | ||
2006 | 38.23 | c | 35.75 | f | 43.94 | d | 56.75 | b | 66.22 | b | 76.78 | a | 79.91 | b | 76.15 | 62.39 | c | 52.07 | d | 45.07 | a | 31.07 | a | 57.14 | a | |
2007 | 15.25 | a | 23.59 | 48.84 | 49.67 | a | 62.92 | a | 70.76 | e | 78.33 | e | 80.73 | 70.33 | a | 56.07 | b | 43.45 | 28.56 | 52.37 | ||||||
2008 | 28.42 | 34.03 | 42.80 | a | 50.84 | a | 62.45 | a | 74.08 | 80.82 | 75.53 | a | 67.47 | 54.50 | 45.62 | b | 30.92 | 53.96 | ||||||||
2009 | 33.53 | 40.11 | 44.42 | 51.45 | 62.71 | 72.48 | 78.39 | 74.87 | 64.95 | 46.77 | 43.07 | b | 25.94 | 53.22 | ||||||||||||
2010 | 31.03 | a | 30.89 | 42.63 | 53.68 | 61.45 | a | 77.13 | 78.76 | 77.79 | 72.45 | 57.61 | 41.35 | 34.58 | 54.95 | |||||||||||
2011 | 27.72 | a | 29.07 | 44.77 | 55.08 | 61.58 | 76.08 | 82.39 | 81.10 | 67.00 | 55.13 | 43.28 | 22.87 | a | 53.84 | |||||||||||
2012 | 31.50 | a | 35.95 | 51.87 | 57.42 | 65.44 | 79.08 | 83.39 | 78.16 | b | 69.10 | 52.95 | 47.56 | c | 32.90 | 57.11 | ||||||||||
2013 | 30.37 | 34.30 | 42.85 | 47.23 | 63.60 | 77.45 | 78.02 | 78.66 | c | 72.87 | 53.21 | 40.85 | 30.00 | 54.12 | ||||||||||||
2014 | 29.84 | 29.27 | 43.10 | 53.22 | 63.11 | 75.17 | 77.94 | 77.26 | 69.96 | g | 58.25 | c | 38.48 | 33.20 | a | 52.62 | a | |||||||||
2015 | 31.19 | 35.27 | 46.23 | 56.25 | 58.92 | a | 75.12 | b | 78.71 | 77.19 | 74.15 | 58.78 | a | 44.33 | 34.97 | 55.93 | ||||||||||
2016 | 34.07 | a | 41.36 | a | 47.52 | 53.30 | 60.47 | 75.77 | d | 79.68 | f | 75.73 | c | 69.73 | 60.77 | 48.25 | 27.98 | c | 54.09 | a | ||||||
2017 | 31.60 | 41.84 | 49.32 | 54.08 | 61.25 | a | 75.45 | 79.47 | a | 73.29 | b | 69.27 | 56.39 | 47.83 | 34.00 | 56.15 | ||||||||||
2018 | 33.03 | 34.04 | 46.30 | a | 50.70 | 68.97 | 78.57 | 80.28 | a | 74.94 | 70.56 | c | 52.90 | 39.17 | g | 34.50 | 56.80 | a | ||||||||
2019 | 33.06 | 30.96 | 40.02 | 55.37 | 58.06 | 71.83 | 80.73 | 79.00 | 74.18 | 47.74 | 38.97 | 34.97 | 53.74 | |||||||||||||
2020 | 35.08 | 32.79 | 47.23 | 51.75 | 64.92 | 78.03 | 79.47 | 78.69 | 65.17 | 52.21 | 46.31 | a | 32.18 | 55.32 | ||||||||||||
2021 | 31.76 | 25.70 | 43.47 | 51.35 | 61.13 | 73.12 | 78.55 | 78.55 | 71.97 | 56.65 | 45.35 | 38.03 | 54.63 | |||||||||||||
2022 | 28.84 | 30.91 | 40.98 | 54.42 | 63.76 | 73.03 | 80.52 | 76.02 | 69.62 | 55.73 | 38.87 | 28.18 | 53.41 | |||||||||||||
2023 | 28.65 | 31.77 | 39.79 | 51.85 | 64.10 | 69.25 | 76.76 | 76.55 | 69.93 | 55.11 | 43.78 | 36.66 | 53.68 | |||||||||||||
2024 | 26.97 | 40.43 | 44.11 | 53.54 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.17 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.45 | 35.38 | 43.46 | 53.66 | 62.99 | 73.72 | 78.93 | 76.54 | 68.32 | 55.33 | 42.08 | 32.22 | 54.28 | |||||||||||||
S.D. | 4.51 | 4.97 | 4.01 | 3.30 | 2.58 | 3.07 | 2.29 | 2.04 | 2.97 | 3.26 | 3.63 | 3.85 | 1.27 | |||||||||||||
SKEW | -0.60 | -0.50 | -0.54 | -0.01 | 0.13 | 0.03 | -0.09 | 0.08 | -0.08 | -0.27 | -0.62 | -0.64 | 0.23 | |||||||||||||
MAX | 40.97 | 44.91 | 51.87 | 61.90 | 68.97 | 81.12 | 83.39 | 81.10 | 74.18 | 63.65 | 49.72 | 41.08 | 57.11 | |||||||||||||
MIN | 15.25 | 21.71 | 31.89 | 46.27 | 57.56 | 66.67 | 73.84 | 72.08 | 62.02 | 46.77 | 30.18 | 22.05 | 51.86 | |||||||||||||
YRS | 57 | 58 | 60 | 69 | 70 | 69 | 68 | 70 | 66 | 65 | 58 | 59 | 43 |