from https://www.dwd.de/EN/ourservices/zeitreihen/zeitreihen.html?nn=24778#buehneTop
March annual temperature in Germany
1881	2.6
1882	6.0
1883	-1.7
1884	4.7
1885	2.5
1886	0.4
1887	1.1
1888	0.7
1889	0.3
1890	4.1
1891	2.6
1892	0.5
1893	4.3
1894	4.7
1895	1.4
1896	5.3
1897	5.0
1898	2.9
1899	2.6
1900	0.6
1901	2.1
1902	3.4
1903	5.7
1904	3.0
1905	4.5
1906	2.2
1907	2.6
1908	2.3
1909	1.5
1910	3.7
1911	4.0
1912	6.0
1913	6.0
1914	4.7
1915	1.7
1916	3.9
1917	0.0
1918	4.0
1919	3.0
1920	6.1
1921	5.6
1922	3.5
1923	4.9
1924	2.2
1925	1.3
1926	4.0
1927	5.9
1928	2.9
1929	2.6
1930	4.2
1931	0.2
1932	0.8
1933	5.1
1934	4.1
1935	2.7
1936	5.0
1937	2.9
1938	7.0
1939	1.7
1940	2.8
1941	3.3
1942	1.4
1943	5.6
1944	0.9
1945	6.0
1946	3.7
1947	2.6
1948	5.7
1949	2.0
1950	4.8
1951	2.2
1952	2.6
1953	4.8
1954	4.3
1955	0.4
1956	2.9
1957	6.4
1958	-0.3
1959	6.2
1960	4.3
1961	6.0
1962	0.2
1963	2.5
1964	0.6
1965	2.3
1966	3.3
1967	5.4
1968	4.4
1969	0.9
1970	1.2
1971	1.0
1972	5.3
1973	3.9
1974	5.7
1975	3.6
1976	1.3
1977	6.1
1978	4.8
1979	3.7
1980	3.3
1981	6.8
1982	4.2
1983	4.6
1984	2.0
1985	2.8
1986	3.0
1987	-0.4
1988	2.7
1989	7.0
1990	6.9
1991	6.4
1992	4.8
1993	3.6
1994	6.3
1995	3.1
1996	1.0
1997	5.8
1998	5.0
1999	5.4
2000	5.2
2001	4.2
2002	5.4
2003	5.3
2004	4.1
2005	3.6
2006	1.5
2007	6.2
2008	4.2
2009	4.3
2010	4.2
2011	4.9
2012	6.9
2013	0.1
2014	6.9
2015	5.2
2016	4.0
2017	7.2
2018	2.4
2019	6.6
2020	5.3
2021	4.8