|
Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1938 | 73 | 75 | 73 | 78 | 78 | 83 | 83 | 81 | 78 | 67 | 68 | 74 | 76 |
1939 | 79 | 78 | 77 | 75 | 84 | 86 | 88 | 84 | 80 | 66 | 65 | 67 | 77 |
1940 | 77 | 77 | 75 | 78 | 76 | 87 | 88 | 84 | 75 | 69 | 65 | 70 | 77 |
1941 | 78 | 75 | 68 | 71 | 77 | 86 | 88 | 85 | 81 | 70 | 67 | 75 | 77 |
1942 | 77 | 80 | 70 | 74 | 82 | 85 | 87 | 84 | 78 | 71 | 69 | 70 | 77 |
1943 | 79 | 73 | 73 | 76 | 85 | 82 | 86 | 84 | 76 | 71 | 64 | 70 | 77 |
1944 | 74 | 79 | 78 | 79 | 75 | 86 | 84 | 82 | 79 | 66 | 70 | 70 | 77 |
1945 | 74 | 78 | 76 | 77 | 87 | 85 | 85 | 84 | 73 | 69 | 68 | 71 | 77 |
1946 | 74 | 72 | 76 | 77 | 79 | 83 | 85 | 83 | 71 | 74 | 65 | 71 | 76 |
1947 | 75 | 77 | 70 | 81 | 74 | 84 | 87 | 83 | 80 | 74 | 73 | 77 | 78 |
1948 | 75 | 74 | 75 | 76 | 80 | 90 | 93 | 81 | 74 | 64 | 65 | 69 | 76 |
1949 | 72 | 75 | 72 | 82 | 81 | 81 | 85 | 87 | 74 | 71 | 66 | 68 | 76 |
1950 | 72 | 71 | 75 | 76 | 78 | 80 | 86 | 82 | 75 | 63 | 70 | 72 | 75 |
1951 | 74 | 75 | 73 | 78 | 74 | 83 | 87 | 84 | 75 | 65 | 69 | 67 | 75 |
1952 | 76 | 74 | 70 | 78 | 77 | 84 | 88 | 86 | 74 | 70 | 66 | 72 | 76 |
1953 | 77 | 72 | 74 | 77 | 84 | 86 | 88 | 80 | 72 | 65 | 69 | 67 | 76 |
1954 | 74 | 76 | 71 | 78 | 79 | 80 | 86 | 89 | 77 | 72 | 65 | 74 | 77 |
1955 | 74 | 74 | 74 | 72 | 83 | 85 | 86 | 84 | 77 | 72 | 67 | 70 | 77 |
1956 | 74 | 75 | 75 | 66 | 72 | 85 | 88 | 86 | 77 | 66 | 70 | 75 | 76 |
1957 | 74 | 75 | 76 | 74 | 74 | 85 | 85 | 86 | 75 | 69 | 65 | 73 | 76 |
1958 | 78 | 77 | 72 | 70 | 77 | 83 | 88 | 85 | 77 | 68 | 61 | 70 | 76 |
1959 | 77 | 68 | 77 | 74 | 77 | 85 | 87 | 83 | 80 | 68 | 67 | 68 | 76 |
1960 | 72 | 72 | 69 | 71 | 80 | 87 | 85 | 82 | 73 | 67 | 67 | 67 | 74 |
1961 | 75 | 75 | 73 | 74 | 78 | 80 | 85 | 84 | 77 | 65 | 68 | 75 | 76 |
1962 | 75 | 71 | 75 | 75 | 80 | 83 | 87 | 86 | 77 | 62 | 69 | 70 | 76 |
1963 | 78 | 75 | 73 | 74 | 69 | 83 | 87 | 89 | 77 | 69 | 70 | 72 | 76 |
1964 | 72 | 72 | 77 | 71 | 72 | 85 | 86 | 87 | 73 | 71 | 72 | 75 | 76 |
1965 | 78 | 77 | 80 | 73 | 77 | 85 | 88 | 84 | 81 | 69 | 69 | 78 | 78 |
1966 | 80 | 78 | 78 | 78 | 80 | 86 | 88 | 92 | 70 | 79 | 70 | 74 | 79 |
1967 | 75 | 72 | 74 | 75 | 85 | 87 | 90 | 80 | 78 | 70 | 70 | 79 | 78 |
1968 | 80 | 79 | 75 | 76 | 81 | 82 | 86 | 84 | 75 | 66 | 76 | 68 | 77 |
1969 | 75 | 73 | 60 | 64 | 79 | 90 | 88 | 85 | 70 | 71 | 68 | 73 | 75 |
1970 | 80 | 73 | 80 | 82 | 81 | 87 | 87 | 84 | 71 | 68 | 70 | 66 | 77 |
1971 | 79 | 78 | 68 | 67 | 79 | 84 | 87 | 84 | 78 | 71 | 63 | 68 | 76 |
1972 | 70 | 74 | 75 | 73 | 77 | 84 | 90 | 81 | 78 | 71 | 76 | 69 | 77 |
1973 | 72 | 72 | 69 | 67 | 74 | 82 | 87 | 79 | 74 | 59 | 63 | 69 | 72 |
1974 | 73 | 72 | 68 | 76 | 75 | 86 | 84 | 81 | 74 | 66 | 66 | 70 | 74 |
1975 | 74 | 71 | 74 | 80 | 82 | 86 | 89 | 81 | 69 | 66 | 70 | 71 | 76 |
1976 | 70 | 68 | 64 | 74 | 74 | 80 | 78 | 77 | 72 | 63 | 65 | 70 | 71 |
1977 | 70 | 66 | 66 | 68 | 75 | 79 | 80 | 75 | 67 | 60 | 62 | 68 | 70 |
1978 | 71 | 68 | 67 | 73 | 72 | 83 | 81 | 77 | 66 | 61 | 63 | 65 | 71 |
1979 | 65 | 73 | 70 | 72 | 76 | 80 | 82 | 74 | 67 | 68 | 64 | 67 | 72 |
1980 | 73 | 70 | 66 | 70 | 76 | 77 | 84 | 79 | 70 | 64 | 64 | 73 | 72 |
1981 | 69 | 72 | 70 | 71 | 76 | 82 | 85 | 82 | 74 | 64 | 63 | 67 | 73 |
1982 | 73 | 72 | 70 | 76 | 78 | 82 | 84 | 83 | 71 | 67 | 66 | 69 | 74 |
1983 | 72 | 79 | 73 | 69 | 80 | 88 | 86 | 85 | 79 | 63 | 68 | 72 | 76 |
1984 | 77 | 74 | 71 | 75 | 84 | 83 | 85 | 83 | 75 | 65 | 65 | 73 | 76 |
1985 | 79 | 81 | 70 | 77 | 76 | 82 | 87 | 87 | 74 | 66 | 68 | 70 | 76 |
1986 | 74 | 76 | 75 | 76 | 77 | 82 | 88 | 85 | 74 | 61 | 64 | 67 | 75 |
1987 | 73 | 75 | 71 | 71 | 73 | 82 | 88 | 88 | 75 | 64 | 68 | 68 | 75 |
1988 | 67 | 73 | 72 | 79 | 78 | 87 | 86 | 86 | 77 | 67 | 69 | 70 | 76 |
1989 | 67 | 63 | 73 | 75 | 77 | 85 | 84 | 84 | 79 | 72 | 70 | 71 | 75 |
1990 | 70 | 75 | 70 | 70 | 80 | 88 | 80 | 85 | 76 | 68 | 66 | 69 | 75 |
1991 | 77 | 71 | 70 | 81 | 76 | 88 | 88 | 84 | 74 | 70 | 66 | 69 | 76 |
1992 | 69 | 73 | 68 | 78 | 81 | 85 | 87 | 85 | 79 | 72 | 67 | 75 | 77 |
1993 | 74 | 71 | 67 | 77 | 77 | 89 | 84 | 85 | 79 | 66 | 70 | 71 | 76 |
1994 | 72 | 74 | 72 | 70 | 77 | 83 | 89 | 84 | 82 | 63 | 66 | 69 | 75 |
1995 | 73 | 74 | 73 | 73 | 80 | 86 | 88 | 87 | 76 | 76 | 63 | 67 | 76 |
1996 | 67 | 66 | 66 | 71 | 81 | 84 | 87 | 81 | 75 | 67 | 63 | 70 | 73 |
1997 | 73 | 69 | 65 | 73 | 78 | 88 | 84 | 84 | 70 | 69 | 66 | 63 | 74 |
1998 | 68 | 70 | 69 | 77 | 74 | 81 | 88 | 87 | 79 | 71 | 70 | 70 | 75 |
1999 | 72 | 73 | 70 | 76 | 81 | 82 | 91 | 87 | 72 | 71 | 69 | 74 | 77 |
2000 | 77 | 74 | 75 | 82 | 89 | 89 | 92 | 89 | 83 | 67 | 72 | 75 | 80 |
2001 | 76 | 74 | 76 | 80 | 86 | 88 ) | 86 | 83 | 72 | 72 | 64 | 68 | 77 |
2002 | 74 | 70 | 67 | 74 | 71 | 81 | 89 | 85 | 68 | 69 | 69 | 62 | 73 |
2003 | 70 | 68 | 67 | 76 | 72 | 80 | 83 | 84 | 73 | 66 | 65 | 65 | 72 |
2004 | 74 | 71 | 66 | 67 | 75 | 79 | 84 | 76 | 73 | 64 | 64 | 68 | 72 |
2005 | 71 | 69 | 65 | 75 | 79 | 81 | 82 | 79 | 71 | 63 | 69 | 72 | 73 |
2006 | 72 | 69 | 74 | 80 | 78 | 88 | 85 | 88 | 76 | 68 | 70 | 69 | 76 |
2007 | 72 | 71 | 73 | 76 | 85 | 87 | 83 | 85 | 78 | 70 | 63 | 71 | 76 |
2008 | 71 | 74 | 80 | 75 | 84 | 86 | 88 | 83 | 74 | 70 | 68 | 71 | 77 |
2009 | 75 | 74 | 73 | 74 | 79 | 90 | 90 | 85 | 75 | 70 | 70 | 74 | 77 |
2010 | 75 | 74 | 68 | 77 | 86 | 87 | 91 | 85 | 72 | 72 | 71 | 76 | 78 |
2011 | 75 | 70 | 69 | 77 | 85 | 89 | 89 ) | 83 | 77 | 69 | 68 | 74 | 77 |
2012 | 72 | 69 | 72 | 75 | 83 | 82 | 88 | 84 | 82 | 68 | 76 | 73 | 77 |
2013 | 73 | 71 | 67 | 74 | 84 | 83 | 85 | 84 | 73 | 70 | 68 | 70 | 75 |
2014 | 69 | 70 | 69 | 73 | 82 | 82 | 85 | 83 | 76 | 64 | 67 | 69 | 74 |
2015 | 70 | 73 | 78 | 70 | 74 | 85 | 86 | 82 | 76 | 62 | 67 | 65 | 74 |
2016 | 64 | 68 | 65 | 75 | 68 | 83 | 87 | 82 | 78 | 56 | 65 | 63 | 71 |
2017 | 66 | 67 | 69 | 70 | 76 | 83 | 84 | 80 | 73 | 65 | 72 | 72 | 73 |
2018 | 75 | 71 | 72 | 72 | 82 | 84 | 88 | 85 | 73 | 67 | 65 | 68 | 75 |
2019 | 70 | 67 | 75 | 72 | 74 | 86 | 89 | 88 | 73 | 69 | 65 | 70 | 75 |
2020 | 71 | 74 | 72 | 77 | 83 | 87 | 87 | 86 | 80 | 68 | 66 | 64 | 76 |
2021 | 74 | 77 | 73 | 73 | 83 | 84 | 86 | 84 | 75 | 71 | 72 | 75 | 77 |
2022 | 76 | 72 | 75 | 72 | 81 | 90 | 89 | 81 | 76 | 72 | 67 | 71 | 77 |
2023 | 72 | 73 | 73 | 78 | 78 | 86 | 90 | 89 | 77 | 70 | 74 | 71 | 78 |
2024 | 81 | 73 | 70 | 78 | 80 | 88 | 89 | 90 ) | 70 | 67 | 68 ) | 78 ] |
Remarks
The red lines, if any, indicate data inhomogeneity caused by changes in instrumentation, observation methods and/or site location.