|
|
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1957 | -2.1 ] | -5.2 | -9.5 | -14.7 | -13.0 | -17.7 | -18.3 | -20.4 | -11.7 | -6.7 | -1.3 | -11.8 ] | |
| 1958 | 0.3 | -3.1 ] | 0.3 ] | ||||||||||
| 1959 | -0.2 ] | -4.4 | -5.5 | -10.1 | -14.6 | -13.3 | -16.3 | -19.2 | -21.7 | -12.7 | -9.1 | -2.2 | -11.7 ] |
| 1960 | -0.8 | -4.7 | -7.5 | -9.8 | -15.7 | -19.6 | -19.3 ) | -19.1 | -22.4 | -14.1 | -7.3 | -1.9 | -11.8 |
| 1961 | -2.2 | -2.3 | -7.5 | -11.4 | -14.8 | -13.8 | -19.8 | -18.8 | -15.9 | -11.0 | -6.0 | -2.7 | -10.5 |
| 1962 | -2.1 | -2.2 ] | -2.1 ] | ||||||||||
| 1963 | |||||||||||||
| 1964 | |||||||||||||
| 1965 | |||||||||||||
| 1966 | -3.9 | -5.9 | -10.8 | -12.6 | -18.0 | -19.6 | -21.0 | -16.6 | -15.8 | -5.9 | -1.1 | -11.9 ] | |
| 1967 | -0.1 | -4.5 | -7.3 | -9.7 | -12.3 | -14.2 | -16.8 | -18.4 | -19.5 | -12.5 | -5.5 | -1.3 | -10.2 |
| 1968 | -1.1 | -3.1 | -4.7 | -9.0 | -11.7 | -15.7 | -19.3 | -16.8 | -19.1 | -12.8 | -6.1 | -2.2 | -10.1 |
| 1969 | 0.4 | -1.5 | -4.5 | -8.2 | -11.3 | -11.7 | -17.5 | -22.3 | -19.8 | -12.7 | -5.8 | -0.9 | -9.6 |
| 1970 | -0.9 | -3.6 | -5.6 | -8.9 | -15.1 | -16.5 | -18.3 | -20.5 | -20.7 | -11.5 | -6.0 | -1.1 | -10.7 |
| 1971 | -0.5 | -2.1 | -7.2 | -10.8 | -16.7 | -18.4 | -18.8 | -20.0 | -16.0 | -12.6 | -7.3 | -0.7 | -10.9 |
| 1972 | -0.1 | -2.8 | -7.7 | -10.1 | -16.1 | -17.8 | -20.3 | -15.5 | -14.1 | -13.4 | -6.4 | -2.5 | -10.6 |
| 1973 | -0.8 | -4.0 | -7.6 | -9.1 | -11.3 | -14.5 | -20.3 | -22.9 | -17.3 | -11.4 | -6.3 | -2.2 | -10.6 |
| 1974 | -1.4 | -3.1 | -8.5 | -10.9 | -12.4 | -16.7 | -16.7 | -17.7 | -17.4 | -14.0 | -5.7 | -0.8 | -10.4 |
| 1975 | -0.3 | -3.4 | -6.2 | -12.1 | -14.0 | -15.3 | -20.8 | -22.3 | -18.9 | -13.6 | -6.9 | -2.5 | -11.4 |
| 1976 | -1.5 | -3.9 | -6.7 | -11.5 | -15.1 | -19.5 | -21.4 | -23.2 | -21.0 | -16.1 | -6.7 | -0.1 | -12.2 |
| 1977 | 1.0 | -3.7 | -6.1 | -11.3 | -12.1 | -16.0 | -13.5 | -16.0 | -18.2 | -15.2 | -7.6 | -1.4 | -10.0 |
| 1978 | -2.1 | -3.8 | -9.3 | -11.3 | -11.7 | -16.9 | -14.7 | -21.3 | -15.2 | -13.7 | -7.2 | -1.6 | -10.7 |
| 1979 | -0.4 | -3.3 | -6.7 | -9.2 | -13.8 | -18.5 | -20.5 | -19.4 | -18.7 | -14.4 | -4.9 | -1.2 | -10.9 |
| 1980 | 0.6 | -3.2 | -4.1 | -6.2 | -9.9 | -12.3 | -13.5 | -17.2 | -15.7 | -12.7 | -4.2 | -0.5 | -8.2 |
| 1981 | -1.2 | -2.6 | -4.9 | -8.8 | -11.7 | -14.8 | -14.1 | -16.1 | -18.1 | -15.5 | -6.6 | -1.8 | -9.7 |
| 1982 | -1.6 | -4.0 | -6.2 | -9.4 | -12.9 | -14.8 | -17.8 | -22.4 | -20.4 | -15.5 | -5.9 | -0.7 | -11.0 |
| 1983 | 0.3 | -3.0 | -7.0 | -10.6 | -12.2 | -13.6 | -16.2 | -19.3 | -14.2 | -12.4 | -8.4 | -3.5 | -10.0 |
| 1984 | -0.1 | -3.1 | -6.0 | -9.7 | -11.3 | -18.1 | -21.8 | -19.4 | -16.6 | -15.2 | -7.4 | -0.4 | -10.8 |
| 1985 | 0.6 | -2.2 | -6.7 | -6.8 | -13.5 | -13.8 | -17.3 | -21.8 | -16.6 | -13.3 | -7.6 | -2.5 | -10.1 |
| 1986 | -1.4 | -1.0 | -4.7 | -9.8 | -14.2 | -16.8 | -18.4 | -18.0 | -14.6 | -13.7 | -6.0 | -1.7 | -10.0 |
| 1987 | 0.0 | -2.4 | -5.0 | -7.8 | -12.6 | -12.2 | -18.1 | -21.7 | -19.8 | -13.7 | -5.3 | -1.3 | -10.0 |
| 1988 | -0.1 | -3.2 | -4.7 | -11.0 | -11.1 | -14.4 | -16.6 | -17.9 | -16.2 | -12.1 | -7.3 | -2.4 | -9.7 |
| 1989 | -1.1 | -2.2 | -6.2 | -11.9 | -21.1 | -18.6 | -18.5 | -19.9 | -22.8 | -12.1 | -6.7 | -0.8 | -11.8 |
| 1990 | 0.1 | -3.4 | -5.9 | -11.1 | -14.4 | -16.9 | -11.0 | -21.7 | -23.5 | -11.3 | -6.8 | -1.0 | -10.6 |
| 1991 | -0.9 | -1.7 | -6.5 | -11.1 | -11.2 | -14.9 | -15.2 | -17.5 | -16.9 | -16.1 | -7.0 | 0.0 | -9.9 |
| 1992 | 0.0 | -2.7 | -5.5 | -8.8 | -12.2 | -12.6 | -16.1 | -17.8 | -20.9 | -14.1 | -6.4 | -2.2 | -9.9 |
| 1993 | 0.4 | -3.7 | -7.3 | -12.7 | -16.2 | -19.4 | -21.0 | -20.5 | -17.9 | -13.8 | -7.6 | -1.6 | -11.8 |
| 1994 | -0.8 | -4.7 | -7.5 | -10.6 | -13.9 | -13.5 | -14.1 | -20.8 | -17.2 | -12.3 | -6.5 | -2.2 | -10.3 |
| 1995 | -2.3 | -2.9 | -8.9 ) | -8.9 | -15.0 | -20.9 | -14.1 | -22.6 | -21.7 | -12.2 | -7.5 | -2.3 | -11.6 |
| 1996 | -1.4 | -2.2 | -7.1 | -11.2 | -16.3 ) | -16.3 | -14.6 | -15.9 | -11.8 | -10.9 | -5.9 | -1.5 | -9.6 |
| 1997 | -1.1 | -2.7 | -6.7 | -8.1 ) | -15.0 | -15.2 | -20.4 | -18.1 | -23.6 | -13.3 | -7.5 | -0.1 | -11.0 |
| 1998 | -0.2 | -2.3 | -4.1 | -10.3 | -11.7 | -14.1 | -16.4 | -22.2 | -16.4 | -14.0 | -6.1 | -2.7 | -10.0 |
| 1999 | -1.2 | -3.8 | -7.5 | -11.0 | -12.7 | -13.8 | -21.1 | -21.2 | -19.4 | -14.6 | -7.4 | -3.5 | -11.4 |
| 2000 | -2.3 | -4.2 | -11.7 | -11.0 | -15.7 | -11.8 | -19.1 | -17.4 | -17.8 | -12.9 | -5.8 | -1.3 | -10.9 |
| 2001 | -1.0 | -2.2 | -6.6 | -11.7 | -13.8 | -17.7 | -18.1 | -20.4 | -18.7 | -14.9 | -7.1 | -1.9 | -11.2 |
| 2002 | -1.8 | -3.4 | -6.8 | -9.9 ) | -10.0 | -14.5 | -13.4 | -17.5 | -16.4 | -11.0 | -7.1 | -2.0 | -9.5 |
| 2003 | 0.0 | -2.4 | -4.7 | -7.7 | -12.9 | -12.4 | -16.7 | -16.8 | -15.2 | -13.3 | -5.6 | -0.7 | -9.0 |
| 2004 | 0.3 | -2.0 | -4.9 | -8.7 | -12.6 | -12.6 | -20.6 | -19.4 | -20.4 | -11.6 | -7.5 | 0.2 | -10.0 |
| 2005 | -0.5 | -1.8 | -5.7 | -10.5 | -11.4 | -14.3 | -14.6 | -16.4 | -17.8 | -14.2 | -9.4 | -0.9 | -9.8 |
| 2006 | -1.0 | -4.3 | -6.2 | -9.6 | -10.5 | -16.2 | -24.1 | -17.0 | -18.8 | -16.0 | -6.7 | -1.8 | -11.0 |
| 2007 | 0.2 | -3.2 | -7.7 | -10.4 | -12.3 | -12.7 | -16.3 | -16.1 | -19.4 | -10.8 | -4.5 | -1.5 | -9.6 |
| 2008 | -1.8 | -4.2 | -8.1 | -9.1 | -15.3 | -20.6 | -14.7 | -22.1 | -15.2 | -17.5 | -7.4 | -1.5 | -11.5 |
| 2009 | -1.2 | -2.9 | -6.0 | -12.6 | -14.7 | -11.6 | -16.3 | -20.0 | -16.7 | -13.5 | -6.5 | -1.6 | -10.3 |
| 2010 | 0.4 | -1.3 | -7.0 | -11.9 | -15.4 | -17.8 | -21.3 | -23.1 | -17.9 | -13.6 | -6.8 | -2.1 | -11.5 |
| 2011 | 0.0 | -4.3 | -9.2 | -10.5 | -14.2 | -11.7 | -16.3 | -17.2 | -18.2 | -16.2 | -5.4 | -3.3 | -10.5 |
| 2012 | -1.4 | -4.0 | -8.0 | -13.6 | -14.9 | -17.7 | -19.3 | -17.5 | -23.2 | -12.1 | -4.6 | -0.7 | -11.4 |
| 2013 | 0.8 | -2.3 | -5.4 | -11.0 | -17.6 | -14.7 | -19.2 | -16.4 | -15.2 | -12.5 | -3.9 | -1.1 | -9.9 |
| 2014 | -1.2 | -2.7 | -6.2 | -10.7 | -15.2 | -15.6 | -19.5 | -22.2 | -17.1 | -16.7 | -6.6 | -1.3 | -11.2 |
| 2015 | -2.2 | -3.6 | -7.1 | -11.9 | -13.1 | -18.7 | -17.7 | -18.6 | -21.5 | -12.8 | -5.7 | -1.7 | -11.2 |
| 2016 | -0.8 | -2.8 | -7.7 | -10.0 | -12.5 | -14.3 | -18.1 | -13.7 | -19.1 | -9.3 | -4.7 | -0.7 | -9.5 |
| 2017 | -0.8 | -2.9 | -5.3 | -9.3 | -10.1 | -18.6 | -15.5 | -22.5 ) | -17.3 | -12.4 | -5.2 | -0.9 | -10.1 |
| 2018 | -1.0 | -1.6 | -5.9 | -7.8 | -16.0 | -13.1 | -17.9 | -16.2 | -19.1 | -16.0 | -6.7 | -1.7 | -10.2 |
| 2019 | -1.2 | -2.2 | -6.8 | -10.4 | -12.6 | -11.8 | -18.3 | -17.6 | -19.3 | -8.0 | -6.0 | -0.5 | -9.6 |
| 2020 | -0.2 | -3.2 | -6.7 | -10.4 | -11.1 | -16.3 | -18.3 | -18.5 | -18.2 | -12.7 | -4.7 | -3.2 | -10.3 |
| 2021 | -1.6 | -4.2 | -6.4 | -10.6 | -13.2 ) | -17.1 | -18.1 | -20.2 | -16.0 | -11.6 | -5.8 | -1.5 | -10.5 |
| 2022 | -1.0 | -3.2 | -5.3 | -10.9 | -12.7 | -12.9 | -17.9 | -14.8 | -19.7 | -11.0 | -6.6 | -2.5 | -9.9 |
| 2023 | -1.7 | -2.9 | -6.0 | -9.6 | -10.4 | -13.4 | -15.2 | -15.2 ) | -16.2 | -13.1 | -7.5 | -1.8 | -9.4 |
| 2024 | -2.0 | -3.1 | -6.3 | -9.6 ] | -3.8 ] |
Remarks
The red lines, if any, indicate data inhomogeneity caused by changes in instrumentation, observation methods and/or site location.