|
Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1951 | 4.5 | 5.2 | 5.9 | 5.5 | 6.1 | 4.6 | 4.4 | 4.8 | 5.1 | 4.6 | 5.5 | 5.1 | 5.1 |
1952 | 5.4 | 5.5 | 5.0 | 6.1 | 6.6 | 4.9 | 4.1 | 3.6 | 4.2 | 5.4 | 4.8 | 4.7 | 5.0 |
1953 | 6.0 | 5.6 | 5.9 | 5.1 | 4.9 | 4.4 | 3.8 | 3.6 | 4.7 | 5.0 | 5.9 | 5.2 | 5.0 |
1954 | 4.8 | 5.5 | 4.7 | 5.6 | 6.0 | 3.5 | 3.7 | 3.9 | 4.4 | 3.8 | 5.3 | 6.0 | 4.8 |
1955 | 6.3 | 6.5 | 5.9 | 5.8 | 5.3 | 5.0 | 5.2 | 4.0 | 4.5 | 4.9 | 5.6 | 6.4 | 5.5 |
1956 | 5.6 | 6.1 | 5.6 | 5.9 | 6.5 | 5.0 | 3.4 | 4.6 | 4.3 | 4.5 | 5.3 | 6.1 | 5.2 |
1957 | 4.8 | 5.2 | 5.7 | 5.1 | 5.3 | 4.5 | 4.2 | 4.6 | 4.3 | 5.0 | 5.7 | 5.2 | 5.0 |
1958 | 6.6 | 5.5 | 5.6 | 4.9 | 5.3 | 4.8 | 4.1 | 4.7 | 4.2 | 4.1 | 4.8 | 6.6 | 5.1 |
1959 | 5.9 | 5.1 | 3.8 | 6.3 | 5.2 | 3.3 | 4.3 | 4.2 | 4.2 | 5.1 | 4.9 | 5.2 | 4.8 |
1960 | 5.8 | 5.3 | 5.3 | 5.2 | 4.5 | 4.6 | 4.9 | 4.1 | 4.6 | 4.3 | 5.0 | 6.0 | 5.0 |
1961 | 4.4 | 4.9 | 5.0 | 5.3 | 5.4 | 4.5 | 4.2 | 3.6 | 4.2 | 4.3 | 4.8 | 5.1 | 4.6 |
1962 | 6.0 | 3.5 | 4.2 | 5.0 | 4.0 | 4.5 | 3.3 | 3.7 | 3.7 | 3.9 | 4.6 | 4.8 | 4.3 |
1963 | 5.3 | 4.6 | 3.9 | 4.1 | 5.7 | 4.7 | 3.9 | 2.8 | 3.6 | 3.7 | 4.8 | 3.9 | 4.3 |
1964 | 4.1 | 4.2 | 4.3 | 4.2 | 4.2 | 4.1 | 3.8 | 4.1 | 3.6 | 4.2 | 4.2 | 4.7 | 4.1 |
1965 | 5.3 | 5.1 | 4.3 | 5.0 | 4.0 | 3.8 | 3.4 | 3.8 | 3.9 | 3.6 | 4.7 | 5.2 | 4.3 |
1966 | 5.6 | 4.6 | 5.7 | 4.7 | 4.6 | 4.2 | 4.5 | 3.4 | 4.0 | 4.7 | 4.3 | 4.6 | 4.6 |
1967 | 5.1 | 3.9 | 4.3 | 4.9 | 3.8 | 4.0 | 3.7 | 2.9 | 4.3 | 4.0 | 4.5 | 3.7 | 4.1 |
1968 | 5.1 | 4.0 | 4.4 | 3.6 | 3.8 | 6.3 | 4.8 | 4.9 | 5.1 | 5.9 | 5.8 | 6.7 | 5.0 |
1969 | 5.3 | 6.8 | 5.9 | 5.6 | 6.8 | 5.7 | 4.8 | 4.2 | 5.8 | 5.1 | 5.8 | 5.8 | 5.6 |
1970 | 6.0 | 5.7 | 5.8 | 6.5 | 5.5 | 5.5 | 4.9 | 4.0 | 5.7 | 5.2 | 6.0 | 6.4 | 5.6 |
1971 | 6.0 | 5.7 | 6.5 | 6.3 | 5.8 | 5.1 | 4.8 | 4.4 | 5.1 | 5.7 | 5.8 | 6.2 | 5.6 |
1972 | 5.6 | 5.5 | 5.3 | 5.8 | 7.1 | 5.9 | 5.2 | 5.8 | 6.3 | 7.2 | 7.9 | 6.2 | 6.2 |
1973 | 5.6 | 5.5 | 5.3 | 5.5 | 7.6 | 3.9 | 5.2 | 4.6 | 3.7 | 5.5 | 5.6 | 6.0 | 5.3 |
1974 | 7.6 | 5.3 | 4.1 | 4.7 | 5.3 | 3.8 | 3.8 | 4.3 | 4.4 | 5.3 | 6.2 | 5.2 | 5.0 |
1975 | 5.0 | 5.1 | 4.4 | 4.8 | 4.5 | 3.8 | 3.7 | 4.5 | 4.7 ) | 4.4 | 4.8 | 5.0 ) | 4.6 |
1976 | 5.3 | 5.2 | 4.8 | 5.0 | 5.8 | 4.4 | 5.1 | 4.0 | 4.1 | 5.6 | 5.5 | 4.8 | 5.0 |
1977 | 5.1 | 4.4 | 5.0 | 5.7 ) | 5.5 | 4.3 | 4.5 | 3.7 | 4.5 | 5.3 | 4.6 | 4.8 ) | 4.8 |
1978 | 4.7 | 4.8 | 4.2 | 4.5 | 5.4 | 4.5 | 3.8 | 3.6 | 4.3 | 4.6 | 4.6 | 5.4 | 4.5 |
1979 | 5.4 | 5.3 | 4.7 | 4.3 | 4.5 | 4.8 | 3.7 | 4.4 | 3.6 | 4.6 | 5.0 | 4.7 | 4.6 |
1980 | 5.6 | 4.5 | 5.0 | 3.9 | 4.7 | 4.3 | 2.9 | 3.0 | 4.3 | 4.9 | 5.1 | 5.5 | 4.5 |
1981 | 5.5 | 4.4 | 5.0 | 4.9 | 5.4 | 3.1 | 4.1 | 5.0 | 4.9 | 5.4 | 5.7 | 5.4 | 4.9 |
1982 | 5.3 | 3.9 | 4.6 | 5.3 | 4.5 | 4.8 | 4.1 | 3.6 | 4.4 | 4.7 | 5.2 | 4.9 | 4.6 |
1983 | 5.0 | 5.2 | 4.0 | 5.3 | 4.7 | 3.8 | 2.8 | 3.8 | 4.3 | 5.3 | 5.0 | 5.3 | 4.5 |
1984 | 5.6 | 5.6 | 4.9 | 4.1 | 3.8 | 3.9 | 3.0 | 4.5 | 3.9 | 5.1 | 5.5 | 4.8 | 4.6 |
1985 | 5.2 | 4.8 | 3.8 | 3.6 | 4.5 | 3.9 | 3.6 | 3.9 | 3.9 | 4.8 | 4.8 | 5.0 | 4.3 |
1986 | 5.1 | 4.4 | 4.7 | 4.6 | 4.9 | 4.3 | 3.8 ) | 4.4 | 4.3 | 5.0 | 5.2 | 5.1 | 4.7 |
1987 | 5.3 | 5.1 | 4.7 | 5.0 | 5.7 | 3.6 | 3.6 | 3.7 | 4.1 | 5.2 | 4.6 | 5.1 | 4.6 |
1988 | 4.7 | 4.3 | 4.8 ) | 4.3 | 4.2 | 3.2 | 3.2 | 4.0 | 3.9 | 5.5 | 4.5 | 4.9 | 4.3 |
1989 | 4.8 | 4.3 | 4.9 | 4.9 | 4.4 | 4.4 | 4.1 | 3.7 | 3.8 | 4.0 | 4.9 | 4.9 | 4.4 |
1990 | 4.7 | 3.7 | 4.4 | 5.5 | 4.8 | 3.6 | 3.2 | 3.9 | 4.0 | 4.0 | 5.0 | 5.0 | 4.3 |
1991 | 5.6 | 4.4 | 4.3 | 4.4 | 5.4 | 3.8 ) | 3.6 ) | 4.1 ) | 4.5 | 4.8 | 4.6 | 4.6 | 4.5 |
1992 | 4.1 | 4.3 ) | 4.4 ) | 5.1 | 4.1 | 4.1 | 3.9 | 4.4 | 4.9 | 4.4 | 5.3 | 4.8 | 4.5 |
1993 | 4.8 | 4.6 | 4.8 | 5.2 | 3.8 | 4.0 | 4.0 | 3.6 | 4.1 | 5.0 | 4.6 | 5.1 | 4.5 |
1994 | 4.1 | 5.9 | 4.9 | 5.0 | 4.8 | 3.8 | 3.8 | 3.9 | 5.2 | 4.9 ) | 4.9 | 4.7 | 4.7 |
1995 | 5.1 | 4.4 | 4.0 | 4.7 | 4.3 | 3.5 | 4.1 | 3.7 | 4.1 ) | 3.9 ) | 6.0 | 5.5 | 4.4 |
1996 | 5.4 | 4.4 | 5.0 | 4.8 | 4.2 | 3.7 | 3.4 | 3.1 | 3.6 | 4.8 | 5.1 | 5.0 | 4.4 |
1997 | 5.5 | 4.4 | 4.6 | 4.4 | 4.4 | 3.9 | 4.1 | 4.1 | 4.0 | 4.6 | 5.0 | 5.0 ) | 4.5 |
1998 | 5.0 | 4.4 | 4.8 | 5.6 | 5.4 | 4.2 | 3.5 | 3.5 | 4.4 | 4.2 | 5.3 | 4.9 | 4.6 |
1999 | 5.0 | 4.9 ) | 4.8 | 4.0 | 4.4 | 4.5 | 3.8 | 4.3 | 4.4 | 5.2 | 5.1 | 4.6 | 4.6 |
2000 | 5.6 | 4.3 | 4.3 | 4.4 | 3.3 | 4.0 | 3.6 | 3.5 | 4.4 | 4.7 | 4.6 | 5.1 | 4.3 |
2001 | 5.0 | 4.5 | 5.4 | 4.9 | 5.2 | 4.8 | 3.8 | 3.6 | 4.3 | 4.8 | 4.8 | 5.0 | 4.7 |
2002 | 4.7 | 4.3 | 4.6 | 4.6 | 3.7 | 5.2 | 3.6 | 4.0 | 3.6 | 5.5 | 6.0 | 4.7 | 4.5 |
2003 | 5.4 | 3.9 | 5.1 | 4.8 | 4.6 | 4.3 | 3.7 | 3.5 | 3.7 | 4.3 | 4.6 | 5.2 | 4.4 |
2004 | 5.2 | 5.6 | 5.0 | 4.8 | 4.6 | 5.0 | 4.1 | 3.8 | 4.3 | 4.4 | 5.4 | 6.1 | 4.9 |
2005 | 5.5 | 5.3 | 5.2 | 5.1 | 4.7 | 3.7 | 4.0 | 4.1 | 3.9 | 4.7 | 4.5 ) | 5.8 | 4.7 |
2006 | 5.2 | 4.6 | 5.4 | 4.6 | 5.3 | 3.3 | 3.4 | 3.3 | 3.7 | 4.4 | 4.6 | 4.6 | 4.4 |
2007 | 3.8 | 4.5 | 4.5 | 3.7 | 5.1 | 3.9 | 3.7 | 4.2 | 4.5 | 4.2 | 5.1 | 4.4 ) | 4.3 |
2008 | 4.6 | 4.5 | 3.9 | 3.4 | 4.0 | 4.3 | 3.6 | 4.2 | 3.8 | 4.0 | 4.9 | 5.2 | 4.2 |
2009 | 5.3 | 4.8 | 4.8 | 5.0 | 4.7 | 3.9 | 3.8 | 3.6 | 3.5 | 4.2 | 4.8 | 4.5 | 4.4 |
2010 | 5.5 | 4.1 | 4.7 | 4.3 | 4.9 | 4.0 | 3.3 | 4.1 | 4.1 | 3.7 | 5.2 | 5.1 | 4.4 |
2011 | 4.8 | 4.4 | 3.9 | 5.7 | 4.7 | 4.1 | 3.3 ) | 3.6 | 4.5 | 4.7 | 4.9 | 5.0 | 4.5 |
2012 | 4.7 | 5.0 | 4.5 | 3.9 | 4.1 | 3.9 | 3.7 | 3.7 | 4.1 | 4.8 | 6.2 | 5.5 | 4.5 |
2013 | 5.6 | 5.3 | 5.7 | 4.9 | 4.7 | 4.0 | 3.9 | 4.5 | 4.1 | 4.8 | 4.7 | 5.9 | 4.8 |
2014 | 4.4 | 5.6 | 4.9 | 5.6 | 5.2 | 4.2 | 4.1 | 3.8 | 4.3 | 4.8 | 4.5 | 5.8 | 4.8 |
2015 | 5.2 | 6.0 | 5.0 | 5.4 | 5.1 | 4.5 | 4.3 | 4.2 | 3.8 | 5.9 | 5.3 | 4.2 | 4.9 |
2016 | 5.2 | 4.7 | 4.2 | 5.3 | 5.1 | 4.1 | 4.1 | 4.4 | 4.3 | 5.0 | 4.3 | 5.3 | 4.7 |
2017 | 4.9 | 4.6 | 4.0 | 5.3 | 5.6 | 5.4 | 4.9 | 4.4 | 4.4 | 4.8 | 4.9 | 4.9 | 4.8 |
2018 | 5.2 | 5.0 | 5.2 | 5.2 | 4.4 | 5.2 | 4.7 | 4.5 | 4.1 | 4.5 | 4.1 | 5.1 | 4.8 |
2019 | 5.2 | 3.9 | 4.5 | 4.7 | 5.3 | 5.0 | 3.8 | 5.1 | 4.3 | 4.8 | 5.2 | 4.9 | 4.7 |
2020 | 4.8 | 4.7 | 5.6 | 4.8 | 5.0 | 4.3 | 4.6 | 4.7 | 5.1 | 4.3 | 5.3 | 4.6 | 4.8 |
2021 | 5.3 | 5.2 | 5.0 | 5.5 | 4.7 | 5.2 | 3.7 | 4.3 | 3.7 | 4.6 | 5.1 | 4.8 | 4.8 |
2022 | 6.2 | 5.3 | 5.0 | 5.3 | 5.3 | 4.8 | 4.0 | 4.0 | 4.4 | 4.5 | 4.8 | 6.2 | 5.0 |
2023 | 4.4 | 4.3 | 5.0 | 5.4 | 5.2 | 4.3 | 4.8 | 5.1 | 3.7 | 4.6 ) | 5.0 | 5.1 | 4.7 |
2024 | 6.3 | 4.8 | 4.4 | 5.1 | 5.6 | 5.4 | 4.3 | 4.3 ] | 5.1 ] |
Remarks
The red lines, if any, indicate data inhomogeneity caused by changes in instrumentation, observation methods and/or site location.