YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.40 | u | 37.64 | a | 32.55 | 35.09 | j | |
1941 | 33.63 | 37.04 | a | 36.31 | 45.72 | 57.79 | 64.00 | 68.55 | 68.06 | 61.02 | 50.18 | 42.38 | 35.19 | b | 49.99 | |||||||||||
1942 | 28.27 | e | 29.45 | 36.48 | 47.89 | b | 55.18 | 64.39 | c | 69.00 | 68.00 | 57.72 | c | 50.16 | b | 48.20 | e | 38.54 | f | 50.43 | a | |||||
1943 | 31.69 | d | 38.28 | a | 38.95 | c | 52.63 | 54.40 | 65.52 | 71.18 | a | 72.82 | 62.27 | 51.03 | 38.41 | a | 30.63 | 50.65 | ||||||||
1944 | 30.43 | c | 32.72 | 36.16 | 42.07 | 56.60 | 64.67 | a | 70.37 | a | 71.06 | 63.22 | 53.77 | a | 40.60 | 31.19 | 49.40 | |||||||||
1945 | 29.88 | a | 35.13 | b | 39.93 | c | 42.40 | a | 59.05 | 63.87 | 69.17 | b | 70.84 | 63.17 | a | 52.42 | 41.83 | 30.70 | a | 49.87 | ||||||
1946 | 30.06 | 34.30 | 40.61 | 55.00 | 53.26 | 67.63 | 71.69 | g | 71.84 | 63.90 | i | 51.93 | b | 36.79 | d | 39.27 | g | 49.05 | c | |||||||
1947 | 30.71 | b | 32.35 | b | 36.57 | d | ----- | z | 58.42 | f | 63.19 | i | 70.32 | c | 69.84 | b | 67.00 | e | 56.71 | b | 34.20 | b | 29.42 | a | 47.46 | c |
1948 | 27.38 | b | 30.21 | c | 31.57 | b | 52.21 | b | 56.19 | b | 65.11 | b | 70.79 | b | 68.55 | b | 64.59 | b | 52.57 | a | 36.69 | c | 34.17 | e | 49.17 | |
1949 | 23.66 | b | 32.77 | b | 40.05 | b | 47.86 | e | 56.93 | j | 64.26 | i | 70.35 | e | 69.62 | f | 63.38 | e | 51.28 | b | 47.93 | g | 31.93 | a | 45.16 | d |
1950 | 34.23 | 38.91 | 38.15 | k | ----- | z | 58.50 | r | 66.62 | f | 67.46 | e | 66.02 | e | 60.46 | b | 59.07 | c | 42.46 | c | 36.12 | c | 50.59 | d | ||
1951 | 30.00 | a | 35.21 | b | 37.02 | d | 43.62 | f | 57.24 | d | 62.98 | e | 71.29 | c | 69.77 | a | 61.12 | b | 52.37 | e | 37.56 | c | 32.52 | g | 51.45 | b |
1952 | 35.69 | b | 35.48 | g | 35.22 | d | 47.73 | b | 57.21 | b | 70.84 | b | 70.09 | b | 72.44 | d | 61.96 | e | 53.05 | c | 33.66 | b | 31.00 | c | 51.72 | a |
1953 | 40.33 | j | 28.90 | d | 44.48 | f | 45.88 | d | 50.43 | i | 70.83 | d | 71.90 | a | 68.02 | c | 64.67 | a | 52.53 | a | 42.65 | c | 29.72 | b | 52.79 | c |
1954 | 34.77 | a | 41.78 | c | 38.61 | h | 53.85 | j | 55.06 | e | 67.04 | g | 73.76 | 71.00 | 65.60 | o | 53.25 | e | 44.66 | a | 35.91 | c | 51.27 | d | ||
1955 | 31.05 | a | 28.75 | b | 34.50 | q | 48.65 | c | 55.88 | e | 61.80 | e | 71.38 | w | 69.17 | d | 64.87 | c | 54.10 | b | 39.19 | d | 36.17 | d | 48.96 | b |
1956 | 34.53 | b | 29.50 | c | 39.43 | a | 47.57 | h | 59.92 | k | 69.96 | b | 73.12 | c | 68.47 | k | 67.00 | b | 55.38 | a | 39.22 | a | 38.27 | a | 49.60 | c |
1957 | 30.25 | c | 41.00 | 37.65 | e | 42.85 | d | 53.40 | b | 65.48 | a | 71.55 | c | 69.69 | d | 60.62 | d | 50.34 | c | 36.98 | f | 37.77 | a | 50.96 | a | |
1958 | 31.52 | 37.04 | 32.26 | b | 43.33 | d | 59.03 | b | 66.58 | 69.73 | a | 71.55 | a | 65.24 | a | 51.50 | b | 37.03 | m | 35.77 | k | 52.78 | b | |||
1959 | 28.43 | a | 32.68 | 36.90 | a | 44.67 | a | 56.28 | d | 65.98 | 68.46 | d | 69.11 | c | 60.89 | b | 48.91 | c | 39.00 | c | 35.03 | b | 48.86 | |||
1960 | 28.03 | 26.71 | a | 38.38 | a | 50.83 | d | 57.61 | 67.37 | 68.61 | d | 70.11 | 64.33 | c | 51.48 | g | 41.83 | 30.70 | h | 51.38 | b | |||||
1961 | 32.32 | a | 34.00 | b | 38.91 | d | 46.23 | b | 57.93 | h | 66.66 | a | 68.14 | b | 67.78 | b | 57.69 | i | 51.10 | g | 35.07 | a | 29.54 | g | 48.64 | d |
1962 | 27.80 | c | 36.94 | c | 34.73 | c | 50.12 | d | 61.30 | d | 61.44 | d | 68.72 | d | 71.26 | 61.96 | b | 55.13 | d | 43.54 | b | 36.38 | c | 50.78 | ||
1963 | 23.22 | b | 36.96 | a | 40.47 | 52.27 | d | 59.95 | b | 66.55 | a | 74.52 | b | 70.05 | a | 65.36 | b | 58.60 | 45.00 | 31.23 | e | 52.01 | ||||
1964 | 31.83 | b | 26.09 | 34.71 | e | 46.78 | a | 59.87 | d | 67.07 | a | 73.53 | b | 70.45 | a | 62.39 | c | 53.54 | c | 41.11 | b | 31.94 | d | 49.94 | ||
1965 | 35.69 | e | 32.78 | c | 30.67 | b | 50.64 | a | 56.34 | b | 63.19 | c | 69.07 | c | 66.05 | a | 59.09 | a | 53.75 | a | 46.35 | 37.66 | b | 50.11 | ||
1966 | 27.56 | e | 30.96 | b | 42.48 | 47.48 | a | 57.93 | b | 66.19 | a | 73.97 | a | 66.73 | a | 63.67 | c | 50.95 | b | 44.88 | b | 32.42 | 50.43 | |||
1967 | 34.35 | d | 34.78 | a | 45.82 | a | 52.18 | 55.32 | c | 63.84 | a | 68.68 | 66.56 | 59.97 | a | 53.60 | 42.83 | 29.38 | a | 50.61 | ||||||
1968 | 32.67 | a | 36.02 | a | 38.97 | 44.52 | 55.16 | 70.08 | 70.48 | a | 67.47 | 61.62 | 53.76 | 39.37 | 33.06 | 50.26 | ||||||||||
1969 | 36.74 | 34.23 | 28.83 | b | 49.85 | 59.13 | 61.23 | 71.00 | 70.40 | 61.47 | 46.03 | 40.15 | 34.53 | 49.47 | ||||||||||||
1970 | 30.71 | 37.86 | 34.74 | 45.17 | a | 58.35 | 64.48 | 72.21 | 71.13 | 61.93 | a | 46.37 | 40.70 | 36.06 | 49.98 | |||||||||||
1971 | 32.15 | 32.32 | 40.58 | 47.78 | 55.43 | a | 68.10 | 69.95 | 66.81 | 58.43 | a | 51.39 | 42.37 | 33.11 | 49.87 | |||||||||||
1972 | 33.44 | 37.71 | 46.78 | a | 51.00 | 57.05 | 68.07 | 68.92 | a | 68.11 | 62.83 | 52.68 | 32.18 | 31.02 | 50.82 | |||||||||||
1973 | 30.32 | 33.59 | a | 38.48 | a | 43.22 | 54.90 | 66.35 | 70.13 | 71.16 | 61.24 | a | 53.90 | 45.12 | a | 34.17 | a | 50.22 | ||||||||
1974 | 30.02 | 36.61 | 47.27 | 50.75 | 64.42 | 69.98 | 72.92 | 67.24 | 59.15 | c | 55.83 | a | 42.07 | 30.40 | 52.22 | |||||||||||
1975 | 30.24 | 31.52 | 39.31 | 45.95 | a | 55.73 | 64.57 | a | 69.29 | 71.03 | a | 59.87 | c | 52.08 | 39.60 | 35.15 | 49.53 | |||||||||
1976 | 32.73 | 39.94 | c | 39.07 | a | 50.55 | b | ----- | z | 65.27 | 69.89 | 68.73 | 62.16 | a | 46.00 | 37.93 | a | 33.91 | c | 49.65 | a | |||||
1977 | 29.31 | 36.32 | 39.48 | e | 47.42 | 58.67 | a | 69.55 | 72.42 | 69.58 | 64.68 | 53.61 | ----- | z | 37.21 | 52.57 | a | |||||||||
1978 | 28.34 | 31.73 | 44.31 | 51.13 | 55.44 | 65.22 | 74.22 | a | 68.56 | 62.85 | 53.63 | 39.95 | 26.94 | 50.19 | ||||||||||||
1979 | 23.23 | a | 32.38 | 39.15 | 47.38 | 54.03 | 63.47 | 69.79 | 67.42 | 63.62 | 54.55 | 34.75 | 35.69 | 48.79 | ||||||||||||
1980 | 31.24 | 36.90 | 37.82 | 44.95 | 53.34 | 68.27 | 75.15 | 71.56 | 64.40 | 49.05 | a | 39.97 | 41.02 | 51.14 | ||||||||||||
1981 | 35.16 | 36.55 | 40.69 | 54.35 | 56.69 | 70.65 | 71.92 | 67.26 | 62.45 | 52.23 | 45.17 | 34.12 | a | 52.27 | ||||||||||||
1982 | 33.63 | a | 34.02 | c | 40.32 | a | 47.60 | d | 55.65 | e | 61.02 | d | 69.41 | b | 70.12 | b | 63.12 | b | 50.67 | b | 39.57 | a | 30.73 | 49.66 | ||
1983 | 34.29 | c | 32.98 | b | 38.03 | b | 42.06 | e | 52.43 | i | 61.75 | d | 70.50 | f | 72.12 | b | 66.07 | 53.98 | a | 41.26 | a | 22.77 | 46.53 | b | ||
1984 | 28.95 | 34.31 | 37.48 | b | 44.05 | a | 59.83 | a | 66.79 | b | 70.53 | a | 69.00 | a | 61.66 | a | 46.73 | 37.88 | j | 34.22 | a | 50.32 | a | |||
1985 | 25.98 | a | 31.93 | a | 41.12 | a | 50.45 | 58.27 | a | 66.90 | 71.21 | 70.28 | a | 61.03 | a | 51.98 | 39.28 | 30.58 | 49.92 | |||||||
1986 | 38.53 | 34.94 | c | 46.60 | 51.21 | a | 57.11 | 65.37 | c | 71.50 | 69.62 | a | 61.35 | 49.60 | 39.57 | c | 32.74 | 51.51 | ||||||||
1987 | 30.33 | a | 34.09 | 38.81 | b | 49.33 | c | 56.40 | 66.18 | b | 70.67 | d | 68.85 | 61.04 | b | 53.08 | 39.45 | 30.06 | 49.86 | |||||||
1988 | 25.87 | 35.38 | 38.81 | b | 50.59 | a | 56.87 | 67.76 | a | 69.94 | 69.90 | a | 60.83 | 54.16 | b | 41.20 | c | 32.83 | a | 50.34 | ||||||
1989 | 34.11 | 29.62 | 46.84 | 52.47 | 59.35 | 63.50 | 69.52 | 68.55 | 61.18 | 53.08 | a | 43.60 | a | 29.47 | a | 50.94 | ||||||||||
1990 | 30.65 | 32.77 | 40.78 | b | 50.25 | 54.77 | 71.13 | 68.78 | a | 66.82 | 64.13 | 53.15 | 42.52 | a | 29.39 | d | 50.43 | |||||||||
1991 | 30.56 | 38.96 | 40.81 | b | 48.27 | 59.32 | 66.47 | 68.98 | a | 67.94 | 61.28 | a | 52.79 | 36.02 | 33.59 | d | 50.42 | |||||||||
1992 | 32.98 | a | 37.27 | a | 43.05 | 54.46 | c | 57.31 | 64.21 | a | 69.69 | 67.76 | 64.18 | 55.35 | 34.48 | a | 30.61 | 50.95 | ||||||||
1993 | 31.21 | 32.62 | 42.37 | a | 48.80 | 56.90 | b | 66.85 | c | 72.38 | a | 68.68 | c | 62.08 | 51.33 | d | 36.39 | b | 34.23 | 50.32 | ||||||
1994 | 32.97 | 36.09 | a | 44.07 | b | 50.21 | b | 59.59 | c | 72.80 | b | 71.81 | 71.07 | a | 64.25 | 52.57 | b | 40.95 | a | 37.75 | a | 52.84 | ||||
1995 | 34.39 | 40.10 | b | 43.15 | a | 46.27 | 54.31 | 63.67 | c | 69.90 | b | 73.44 | 63.96 | b | 54.30 | c | 45.43 | a | 35.02 | 51.99 | ||||||
1996 | 32.50 | a | 38.00 | 39.67 | a | 50.37 | c | 64.68 | c | 69.58 | 71.22 | b | 68.60 | 60.53 | 53.03 | 42.81 | c | 35.32 | 52.19 | |||||||
1997 | 30.24 | 31.83 | d | 45.23 | a | 43.61 | c | 57.52 | b | 66.25 | 71.73 | a | 70.02 | a | 66.61 | b | 52.83 | b | 36.96 | b | 30.71 | 50.30 | ||||
1998 | 36.10 | 35.56 | a | 41.42 | g | 45.65 | 60.43 | a | 68.75 | 73.23 | c | 69.04 | g | 68.17 | g | 53.14 | b | 45.12 | b | 33.39 | c | 50.15 | c | |||
1999 | 37.53 | a | 40.81 | a | 43.93 | d | 46.62 | a | 56.22 | a | 64.77 | 72.20 | a | 70.18 | 62.81 | c | 54.16 | b | 49.02 | d | 34.23 | a | 52.71 | |||
2000 | 35.73 | a | 42.87 | b | 43.18 | c | 53.12 | b | 63.23 | g | 68.31 | a | 73.08 | 74.13 | a | 68.34 | a | 53.28 | a | 35.64 | b | 32.22 | b | 52.72 | a | |
2001 | 28.50 | b | 34.23 | 41.57 | d | 53.61 | c | 59.72 | a | 67.87 | c | 75.37 | 70.68 | a | 65.84 | b | 56.35 | d | 46.00 | c | 35.23 | a | 52.92 | |||
2002 | 33.78 | b | 32.71 | 41.30 | c | 55.29 | b | 61.83 | g | 72.81 | c | 73.26 | b | 72.32 | c | 64.46 | c | 49.82 | 40.50 | c | 30.22 | a | 51.50 | a | ||
2003 | 38.12 | a | 34.33 | d | 43.53 | a | 51.71 | b | 61.62 | b | 63.65 | 76.16 | 72.43 | c | 63.39 | c | 57.20 | a | 42.02 | a | 36.78 | b | 53.41 | |||
2004 | 35.07 | a | 32.09 | b | 47.58 | a | 49.02 | c | 62.88 | b | 67.61 | b | 68.98 | c | 66.88 | c | 63.19 | a | 53.02 | d | 37.48 | i | ----- | z | 54.63 | b |
2005 | 40.00 | r | 36.21 | g | 39.77 | g | 47.66 | h | 57.30 | a | 65.87 | 70.92 | 67.89 | 64.69 | c | 52.67 | d | 43.90 | a | 32.73 | c | 56.99 | d | |||
2006 | 37.57 | a | 34.58 | d | 41.13 | 53.93 | 60.90 | b | 70.28 | c | 71.17 | e | 67.77 | a | 56.27 | b | 50.97 | a | 43.29 | b | 32.76 | b | 51.72 | |||
2007 | 23.80 | c | 34.31 | a | 45.32 | 46.77 | b | 56.11 | c | 64.92 | 70.80 | a | 73.90 | 65.53 | a | 55.03 | b | 42.86 | a | 33.78 | h | 52.67 | a | |||
2008 | 31.96 | d | 35.42 | c | 41.71 | 48.62 | 58.40 | 69.38 | a | 71.15 | 68.43 | b | 61.53 | a | 53.32 | 43.53 | a | 33.80 | a | 51.44 | ||||||
2009 | 36.26 | b | 39.89 | 44.02 | b | 48.19 | a | 59.16 | c | 67.33 | a | 72.08 | a | 69.18 | a | 60.57 | a | 46.19 | b | 45.12 | 28.35 | a | 51.36 | |||
2010 | 33.48 | 25.31 | a | 39.55 | a | 50.70 | 55.55 | c | 70.33 | 71.48 | g | 71.58 | 67.90 | 55.07 | a | 40.07 | a | 38.18 | a | 49.79 | a | |||||
2011 | 32.73 | 31.98 | c | 44.76 | 51.45 | a | 56.82 | 71.50 | 76.27 | 74.32 | 63.27 | 53.11 | 42.45 | a | 26.05 | 52.06 | ||||||||||
2012 | 37.50 | c | 33.77 | a | 47.32 | a | 54.20 | b | 60.87 | 72.12 | 74.50 | a | 71.76 | 64.11 | c | 52.08 | a | ----- | z | ----- | z | 56.82 | b | |||
2013 | 29.81 | ----- | z | ----- | z | 46.17 | 58.88 | a | ----- | z | 70.60 | 70.00 | a | 65.32 | 50.55 | 40.08 | 32.92 | 51.59 | c | |||||||
2014 | 34.94 | 36.20 | 42.87 | 48.88 | 57.53 | 67.65 | 71.77 | 69.16 | 64.32 | 54.97 | 41.26 | a | 32.98 | 51.88 | ||||||||||||
2015 | 33.60 | 36.04 | 44.50 | 49.67 | 55.37 | 68.98 | 71.19 | 69.95 | 66.87 | 55.47 | 40.35 | 32.82 | 52.07 | |||||||||||||
2016 | 33.03 | 38.95 | 43.45 | 48.42 | 54.37 | 68.70 | 74.06 | 68.10 | 64.53 | 58.42 | 44.67 | 33.87 | 52.55 | |||||||||||||
2017 | 31.81 | 42.48 | 47.90 | 48.52 | 55.71 | 70.72 | 72.71 | 66.45 | a | 63.33 | 52.55 | 49.43 | 36.10 | 53.14 | ||||||||||||
2018 | 36.10 | 37.95 | 42.84 | 48.25 | 63.53 | 71.02 | 72.21 | 69.18 | 64.98 | 50.24 | 38.29 | a | 33.55 | 52.34 | ||||||||||||
2019 | 34.76 | 33.83 | a | 39.26 | 51.92 | 53.82 | 66.08 | 72.85 | 73.18 | 68.53 | 47.97 | a | 41.38 | 36.13 | 51.64 | |||||||||||
2020 | 34.40 | 33.38 | 45.74 | 49.17 | c | 61.90 | a | 70.32 | 72.85 | 72.82 | ----- | z | ----- | z | ----- | z | ----- | z | 55.07 | d | ||||||
2021 | 32.81 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.81 | k | |
2022 | 33.36 | b | 31.04 | b | ----- | z | 49.73 | b | 59.69 | d | 68.50 | a | 73.27 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.60 | f |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 31.91 | 34.64 | 40.48 | 48.79 | 57.58 | 66.91 | 71.28 | 69.69 | 63.01 | 52.62 | 40.95 | 33.15 | 50.93 | |||||||||||||
S.D. | 3.46 | 3.65 | 4.13 | 3.29 | 2.63 | 2.89 | 1.99 | 2.04 | 2.43 | 2.72 | 3.62 | 3.12 | 1.19 | |||||||||||||
SKEW | -0.49 | -0.06 | -0.37 | -0.13 | 0.65 | 0.02 | 0.45 | 0.28 | -0.05 | -0.35 | -0.09 | -0.41 | 0.26 | |||||||||||||
MAX | 38.53 | 42.87 | 47.90 | 55.29 | 64.68 | 72.81 | 76.27 | 74.32 | 68.53 | 59.07 | 49.43 | 41.02 | 53.41 | |||||||||||||
MIN | 23.22 | 25.31 | 28.83 | 42.06 | 53.26 | 61.02 | 67.46 | 66.02 | 56.27 | 46.00 | 32.18 | 22.77 | 48.79 | |||||||||||||
YRS | 80 | 78 | 73 | 75 | 71 | 76 | 77 | 77 | 75 | 77 | 73 | 71 | 51 |