YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | 48.97 | a | 53.83 | 65.74 | 71.30 | 84.19 | 92.50 | 95.61 | 92.39 | 80.50 | 71.06 | 53.23 | 44.74 | 71.17 | ||||||||||||
1941 | 45.06 | 54.15 | a | 60.00 | 61.17 | 78.16 | 85.37 | 92.03 | a | 89.87 | 81.39 | b | 66.03 | a | 56.00 | 46.55 | 67.98 | |||||||||
1942 | 43.90 | 47.26 | a | 58.10 | b | 69.41 | a | 80.76 | n | 91.37 | 95.52 | b | 90.87 | 86.00 | e | 72.13 | 63.78 | c | 51.52 | b | 69.99 | a | ||||
1943 | 51.58 | s | 58.25 | d | 61.97 | b | 76.50 | 83.30 | a | 88.83 | a | 94.69 | b | 90.70 | a | 88.11 | c | 75.96 | h | 61.46 | f | ----- | z | 80.29 | d | |
1944 | ----- | z | ----- | z | ----- | z | 67.41 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.41 | k |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | 81.48 | h | 87.81 | c | 94.82 | i | 91.50 | e | ----- | z | ----- | z | ----- | z | ----- | z | 89.66 | j |
1946 | 44.05 | l | 54.65 | b | 63.57 | c | 75.43 | b | 78.63 | a | 93.87 | 92.39 | 88.57 | a | 85.27 | 68.81 | 54.18 | b | 45.29 | 72.79 | a | |||||
1947 | 45.42 | 58.36 | 65.13 | 71.00 | 83.50 | a | 88.69 | a | 95.93 | b | 88.84 | 88.40 | 72.74 | h | 50.53 | 44.63 | a | 70.95 | a | |||||||
1948 | 48.70 | a | 50.31 | 54.80 | a | 74.04 | b | 82.83 | a | 90.38 | a | 95.48 | 90.43 | a | 88.73 | 73.00 | a | 54.57 | 51.27 | i | 73.03 | a | ||||
1949 | 34.03 | 44.18 | 60.84 | 71.14 | i | 78.57 | a | 88.33 | 93.29 | 92.59 | b | 87.75 | b | 69.31 | b | 63.67 | 46.29 | c | 68.99 | a | ||||||
1950 | 50.32 | c | 57.07 | 64.41 | b | 76.54 | b | 80.77 | a | 92.24 | a | 90.87 | 91.87 | 83.73 | 81.94 | 63.63 | c | 54.94 | 74.03 | |||||||
1951 | 50.06 | 54.04 | 61.77 | 71.10 | 80.87 | 90.60 | 98.16 | 92.39 | 88.82 | m | 72.67 | a | 54.38 | a | 44.15 | d | 70.02 | a | ||||||||
1952 | 46.29 | 51.66 | 54.87 | a | 71.00 | 82.81 | 91.53 | 93.74 | 92.23 | 85.64 | b | 79.16 | 49.24 | a | 44.16 | 70.19 | ||||||||||
1953 | 55.52 | 54.50 | 63.13 | 72.17 | 75.35 | 93.76 | a | 95.48 | b | 90.97 | b | 89.77 | 73.48 | 58.04 | c | 45.10 | 72.27 | |||||||||
1954 | 46.71 | 61.86 | 59.71 | 78.00 | a | 84.35 | 91.00 | a | 94.37 | a | 90.77 | 86.10 | 75.52 | 62.33 | 45.89 | c | 73.05 | |||||||||
1955 | 42.74 | 49.14 | 62.84 | 70.37 | 79.03 | 88.20 | 92.87 | a | 90.94 | 89.07 | 77.89 | c | 59.23 | 55.24 | b | 71.46 | ||||||||||
1956 | 52.68 | 48.89 | b | 66.79 | c | 68.96 | c | 84.16 | 94.83 | 93.53 | a | 91.29 | 91.21 | a | 74.70 | a | 53.52 | c | 48.39 | 72.41 | ||||||
1957 | 48.73 | a | 59.82 | 62.90 | 69.07 | 75.27 | a | 93.07 | 92.58 | 89.48 | 87.90 | 68.39 | 52.17 | a | 51.37 | a | 70.90 | |||||||||
1958 | 48.90 | 57.15 | b | 55.68 | 69.62 | a | 85.81 | 93.48 | a | 96.52 | 94.29 | 83.52 | a | 73.65 | 57.03 | 54.74 | 72.53 | |||||||||
1959 | 52.13 | 52.50 | 64.32 | 75.39 | b | 79.84 | 92.53 | 97.35 | 89.52 | 86.87 | 73.86 | b | 57.63 | 47.41 | b | 72.45 | ||||||||||
1960 | 39.10 | 51.24 | 67.74 | 73.83 | 81.39 | 95.23 | 98.35 | 96.06 | 89.37 | 69.23 | a | 58.77 | 36.71 | 71.42 | ||||||||||||
1961 | 45.00 | 58.50 | 63.77 | 73.50 | 83.00 | a | 95.43 | 96.65 | 90.80 | a | 83.00 | 72.68 | 56.90 | 34.97 | a | 71.18 | ||||||||||
1962 | 36.81 | 45.96 | a | 57.48 | 77.47 | 79.84 | 90.55 | a | 94.55 | b | 95.23 | 86.69 | a | 74.68 | 61.80 | 47.62 | b | 70.72 | ||||||||
1963 | 43.00 | 59.04 | a | 62.48 | 69.45 | a | 85.14 | b | 89.38 | d | 97.55 | 88.00 | b | 87.32 | b | 77.04 | d | 59.57 | 45.32 | 71.94 | ||||||
1964 | 47.61 | 51.86 | 58.52 | 67.87 | 80.87 | 89.17 | a | 96.37 | a | 90.77 | a | 84.25 | b | 78.77 | 54.26 | c | 48.90 | b | 70.77 | |||||||
1965 | 49.30 | a | 53.00 | c | 58.55 | b | 68.90 | a | 76.26 | 84.96 | f | 91.13 | 92.85 | e | 82.18 | b | 79.59 | b | 62.32 | b | 47.53 | a | 69.24 | a | ||
1966 | 43.88 | f | 49.81 | a | 67.13 | a | 77.38 | a | 85.81 | 92.59 | c | 96.56 | d | 94.71 | 87.85 | d | 73.45 | b | 64.70 | 49.16 | 76.29 | a | ||||
1967 | 51.40 | a | 60.75 | 69.40 | a | 68.30 | 81.23 | 89.00 | 94.97 | 94.23 | 84.70 | 79.97 | 67.40 | 40.80 | a | 73.51 | ||||||||||
1968 | 32.32 | 58.90 | 65.90 | 71.83 | 83.06 | 96.77 | 97.29 | 89.10 | 90.43 | 78.81 | e | 59.97 | 43.53 | a | 72.33 | |||||||||||
1969 | 55.03 | a | 53.57 | 61.52 | 79.30 | 86.94 | 94.47 | 98.55 | 96.42 | 88.47 | 71.48 | 60.07 | 54.55 | 75.03 | ||||||||||||
1970 | 53.29 | 60.18 | 59.35 | 64.47 | 83.10 | 90.60 | 95.97 | 93.45 | 84.27 | 70.06 | 63.10 | 49.17 | a | 72.25 | ||||||||||||
1971 | 51.35 | 56.32 | 67.19 | 72.00 | 78.65 | 92.57 | 100.19 | 92.13 | 85.83 | 67.16 | 56.73 | 43.52 | 71.97 | |||||||||||||
1972 | 52.90 | 60.59 | 73.71 | 75.20 | 83.26 | 89.50 | 97.61 | 92.35 | 86.26 | c | 67.19 | 52.83 | 45.79 | c | 73.10 | |||||||||||
1973 | 41.73 | a | 50.54 | 53.71 | 67.07 | b | 81.52 | 90.83 | a | 94.73 | a | 92.56 | d | 86.62 | a | 76.90 | 60.27 | 52.87 | 70.78 | |||||||
1974 | 43.45 | b | 54.64 | 68.13 | 72.10 | 86.32 | 98.21 | a | 94.40 | a | 94.39 | 86.29 | b | 72.55 | b | 58.75 | b | 46.38 | b | 72.97 | ||||||
1975 | 46.13 | a | 54.57 | 58.81 | 64.50 | 78.10 | 90.73 | 95.10 | 94.32 | 84.47 | 74.90 | 59.33 | 46.60 | a | 70.63 | |||||||||||
1976 | 50.00 | 57.69 | 61.87 | 71.30 | 81.45 | 91.37 | 95.71 | 92.81 | 81.33 | 71.29 | 61.57 | 49.23 | 72.13 | |||||||||||||
1977 | 41.65 | 59.07 | 61.10 | 73.97 | 77.58 | 94.10 | 94.45 | 93.57 | a | 87.67 | 77.35 | 62.97 | 56.00 | 73.29 | ||||||||||||
1978 | 50.10 | 53.78 | a | 65.77 | 71.67 | 80.65 | 94.93 | 97.94 | 95.26 | 85.70 | 77.48 | 56.83 | 41.10 | 72.60 | ||||||||||||
1979 | 40.58 | 53.07 | 60.67 | a | 73.23 | 79.30 | a | 92.04 | c | 98.35 | 92.70 | a | 91.76 | a | 78.65 | 54.62 | a | 47.43 | a | 71.87 | ||||||
1980 | 49.43 | a | 57.03 | 60.35 | 70.59 | a | 76.58 | 94.47 | 97.10 | b | 93.29 | 87.40 | 72.06 | 60.03 | 53.90 | a | 72.69 | |||||||||
1981 | 51.63 | a | 57.89 | 62.26 | d | 76.30 | 79.87 | 96.23 | 94.94 | 91.67 | a | 83.73 | 69.32 | 62.10 | 51.84 | 73.15 | ||||||||||
1982 | 45.50 | c | 52.16 | c | 62.07 | d | 71.89 | b | 79.03 | b | 90.14 | a | 94.21 | b | 89.83 | h | 82.41 | a | 69.22 | d | 55.33 | 48.70 | a | 68.24 | a | |
1983 | 48.77 | 56.26 | a | 61.41 | b | 63.88 | d | 80.10 | a | 89.21 | a | 93.75 | c | 90.70 | a | 86.14 | a | 71.87 | 61.00 | b | 52.63 | a | 71.31 | |||
1984 | 48.45 | b | 55.77 | c | 64.10 | a | 69.29 | b | 89.37 | a | 89.71 | b | 92.00 | 89.93 | a | 86.32 | b | 67.20 | a | 58.93 | 45.62 | b | 71.39 | |||
1985 | 45.48 | b | 52.96 | 61.22 | d | 76.37 | c | 81.45 | b | 94.23 | 95.94 | 94.69 | b | 80.46 | b | 72.60 | a | 57.93 | b | 49.48 | 71.90 | |||||
1986 | 55.20 | a | 59.56 | c | 67.81 | d | 73.38 | d | 84.07 | d | 92.55 | a | 92.20 | a | 90.87 | 79.97 | 69.70 | a | 58.23 | 43.17 | a | 72.23 | ||||
1987 | 42.40 | a | 52.15 | a | 59.13 | 74.68 | b | 78.32 | 92.20 | 92.69 | b | 89.58 | 85.69 | a | 75.63 | a | 55.67 | 41.66 | b | 69.98 | ||||||
1988 | 45.16 | 57.03 | 64.14 | b | 70.70 | 80.86 | b | 90.20 | 95.74 | 89.10 | 83.97 | 79.10 | 60.03 | 49.70 | a | 72.14 | ||||||||||
1989 | 45.13 | a | 52.59 | a | 71.03 | b | 79.73 | 84.10 | 91.73 | 96.83 | b | 90.53 | a | 86.86 | b | 73.83 | a | 62.41 | a | 50.14 | b | 73.74 | ||||
1990 | 47.52 | b | 53.67 | a | 64.68 | 73.23 | 80.32 | 93.60 | 94.48 | 90.34 | b | 84.22 | c | 74.00 | d | 58.33 | c | 41.79 | b | 71.35 | ||||||
1991 | 43.52 | 57.86 | 56.16 | 69.63 | 76.79 | g | 86.71 | b | 94.63 | d | 91.48 | b | 85.17 | 77.90 | a | 55.83 | 35.90 | 68.62 | a | |||||||
1992 | 40.68 | 53.89 | a | 61.39 | 76.47 | 78.23 | 88.23 | 91.48 | 88.63 | a | 86.70 | 75.33 | d | 52.90 | a | 34.00 | b | 68.99 | ||||||||
1993 | 47.90 | 52.56 | a | 63.58 | 72.90 | a | 80.93 | a | 89.46 | b | 94.97 | 90.03 | 87.03 | 71.19 | 53.33 | 46.97 | a | 70.91 | ||||||||
1994 | 50.74 | 51.57 | 64.52 | 70.03 | a | 78.23 | 94.97 | 97.55 | 94.57 | a | 85.47 | 70.74 | 54.20 | 48.03 | a | 71.72 | ||||||||||
1995 | 47.13 | a | 61.54 | 63.97 | 68.37 | 74.68 | 87.03 | 95.20 | a | 94.94 | 87.63 | 75.35 | 65.00 | 49.94 | 72.56 | |||||||||||
1996 | 53.68 | 60.69 | 63.81 | 73.77 | 86.48 | 94.31 | a | 96.32 | 94.61 | 81.63 | 71.07 | b | 57.77 | 51.80 | a | 73.83 | ||||||||||
1997 | 46.53 | a | 53.29 | 68.57 | a | 67.27 | 83.23 | 89.50 | 94.13 | 89.87 | 84.93 | 71.10 | 59.73 | 43.23 | 70.95 | |||||||||||
1998 | 50.16 | 50.43 | 60.58 | 64.57 | 77.48 | 87.60 | 96.26 | 94.03 | a | 83.07 | 70.32 | 57.97 | 49.40 | a | 70.16 | |||||||||||
1999 | 54.71 | 58.75 | 67.87 | 63.77 | 78.90 | 89.43 | 90.27 | a | 88.19 | 80.87 | 76.19 | 62.70 | 48.45 | 71.68 | ||||||||||||
2000 | 54.00 | 57.52 | 59.10 | b | 75.50 | b | 86.63 | a | 93.57 | 96.13 | 92.07 | a | 86.97 | 72.29 | 50.76 | a | 51.14 | b | 72.97 | |||||||
2001 | 45.17 | b | 54.57 | 63.48 | b | 70.00 | 86.43 | a | 94.67 | 93.53 | a | 92.33 | a | 90.00 | 75.94 | 61.27 | 45.93 | c | 72.78 | |||||||
2002 | 47.42 | 54.85 | a | 62.13 | 76.87 | 82.87 | a | 95.80 | 98.00 | 94.00 | d | 83.18 | b | 69.23 | 57.50 | 42.67 | a | 72.04 | ||||||||
2003 | 52.97 | 53.19 | a | 61.61 | 68.23 | 83.52 | 91.97 | a | 99.58 | 91.50 | a | 86.80 | 77.58 | 53.80 | 46.57 | a | 72.28 | |||||||||
2004 | 45.73 | a | 49.03 | 70.23 | a | 68.43 | 82.42 | 91.93 | 94.42 | 91.00 | 84.00 | 68.93 | a | 54.10 | 44.25 | c | 70.37 | |||||||||
2005 | 50.58 | g | 52.17 | j | 59.86 | c | 69.93 | 74.12 | w | 92.69 | q | 98.77 | a | 89.74 | d | 85.78 | c | 73.23 | 60.59 | a | 50.83 | a | 73.59 | d | ||
2006 | 50.97 | a | 57.63 | a | 57.45 | 72.21 | a | 85.70 | a | 95.00 | 95.68 | 89.45 | 80.33 | 69.13 | 60.67 | 47.41 | b | 71.80 | ||||||||
2007 | 43.59 | b | 55.96 | 67.16 | 73.28 | a | 81.87 | a | 94.83 | a | 96.90 | 92.55 | 85.73 | 72.55 | 63.00 | 42.27 | a | 72.47 | ||||||||
2008 | 42.58 | 53.34 | 63.39 | 70.97 | 76.42 | 93.13 | 93.77 | 92.73 | a | 85.60 | 73.48 | 59.63 | 46.93 | a | 71.00 | |||||||||||
2009 | 49.84 | 55.93 | 64.39 | 68.87 | 83.71 | 85.10 | 95.03 | 93.00 | 83.50 | 69.62 | b | 60.03 | 43.37 | a | 71.03 | |||||||||||
2010 | 42.73 | a | 49.75 | 60.48 | 68.67 | 75.77 | 92.03 | 93.16 | 87.80 | a | 88.10 | 72.40 | a | 57.77 | 51.67 | a | 70.03 | |||||||||
2011 | 45.77 | 50.57 | 65.06 | 71.69 | a | 75.67 | a | 91.17 | 92.97 | b | 94.55 | 83.87 | 71.90 | 56.50 | 43.00 | a | 70.23 | |||||||||
2012 | 52.19 | 54.41 | 64.39 | 73.87 | 84.13 | 95.53 | 92.19 | 92.71 | 83.83 | 76.13 | 61.07 | 48.17 | a | 73.22 | ||||||||||||
2013 | 41.29 | 50.19 | b | 65.29 | 71.48 | a | 80.39 | 95.50 | 92.48 | 87.29 | 81.69 | a | 67.27 | t | 55.57 | 42.70 | a | 69.44 | a | |||||||
2014 | 52.35 | 60.79 | 64.13 | 71.13 | 77.93 | d | 93.46 | f | 94.74 | 88.48 | 86.50 | 76.48 | 61.60 | 48.43 | a | 71.14 | a | |||||||||
2015 | 49.77 | a | 61.25 | 66.45 | 70.43 | 75.39 | 93.10 | a | 90.58 | 92.61 | 86.30 | 72.90 | 55.33 | 46.20 | a | 71.69 | ||||||||||
2016 | 46.53 | a | 59.34 | 67.52 | 70.50 | 75.58 | 95.93 | 95.48 | 87.10 | 82.20 | 75.21 | b | 59.50 | 48.31 | b | 71.93 | ||||||||||
2017 | 46.90 | 58.75 | 68.39 | 70.93 | b | 77.90 | b | 95.80 | 95.03 | a | 90.43 | a | 83.89 | b | 76.32 | 64.62 | a | 53.38 | e | 73.53 | ||||||
2018 | 53.33 | d | 57.11 | 62.20 | a | 76.23 | 82.36 | c | 94.93 | c | 96.14 | b | 92.89 | c | 88.17 | 66.19 | 56.73 | 47.39 | m | 75.12 | a | |||||
2019 | 53.50 | y | 48.18 | 62.14 | c | 73.14 | a | 71.90 | b | 88.78 | c | 96.20 | a | 95.61 | 86.13 | 71.47 | a | 59.62 | a | 43.80 | a | 72.45 | a | |||
2020 | 50.67 | d | 55.64 | a | 61.68 | 70.90 | 84.90 | 91.53 | 95.39 | 98.87 | 89.13 | 79.74 | 61.90 | 47.13 | a | 73.96 | ||||||||||
2021 | 46.60 | a | 57.18 | 58.90 | a | 73.34 | a | 81.86 | b | 95.70 | 95.44 | d | 92.52 | b | 86.67 | 67.61 | 62.63 | 50.67 | a | 72.43 | ||||||
2022 | 48.55 | 52.14 | 61.68 | 73.93 | 84.19 | 92.17 | 94.35 | 88.97 | 87.23 | 70.48 | 53.76 | a | 47.93 | b | 71.28 | |||||||||||
2023 | 45.54 | c | 50.39 | 57.61 | 70.50 | 80.06 | 86.77 | 100.29 | 90.94 | 85.10 | a | 74.87 | 59.87 | 48.48 | 70.87 | |||||||||||
2024 | 49.17 | a | 56.45 | 61.54 | c | 71.13 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.72 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 47.36 | 54.79 | 62.82 | 71.58 | 81.02 | 91.90 | 95.17 | 91.80 | 85.61 | 73.27 | 58.43 | 47.03 | 71.87 | |||||||||||||
S.D. | 4.71 | 3.91 | 3.86 | 3.67 | 3.49 | 2.88 | 2.19 | 2.33 | 2.63 | 3.70 | 3.80 | 4.51 | 1.25 | |||||||||||||
SKEW | -0.67 | -0.26 | 0.10 | -0.22 | -0.13 | -0.21 | 0.01 | 0.26 | -0.13 | 0.14 | -0.16 | -0.49 | -0.28 | |||||||||||||
MAX | 55.52 | 61.86 | 73.71 | 79.73 | 89.37 | 98.21 | 100.29 | 98.87 | 91.76 | 81.94 | 67.40 | 56.00 | 75.03 | |||||||||||||
MIN | 32.32 | 44.18 | 53.71 | 61.17 | 71.90 | 85.10 | 90.27 | 87.10 | 79.97 | 66.03 | 49.24 | 34.00 | 67.98 | |||||||||||||
YRS | 78 | 82 | 83 | 82 | 79 | 80 | 82 | 82 | 81 | 79 | 81 | 79 | 66 |