from https://www.dwd.de/EN/ourservices/zeitreihen/zeitreihen.html?nn=24778#buehneTop
August annual temperature in Germany
1881	15.9
1882	14.9
1883	15.9
1884	17.0
1885	14.6
1886	16.9
1887	15.7
1888	15.1
1889	15.4
1890	16.5
1891	15.0
1892	18.1
1893	17.0
1894	15.4
1895	16.5
1896	14.3
1897	17.1
1898	18.0
1899	16.8
1900	16.2
1901	16.4
1902	14.7
1903	15.4
1904	16.5
1905	16.5
1906	16.5
1907	15.7
1908	14.5
1909	16.2
1910	15.8
1911	19.4
1912	14.0
1913	14.8
1914	17.2
1915	15.2
1916	15.9
1917	16.7
1918	15.9
1919	16.1
1920	15.0
1921	17.3
1922	15.4
1923	15.7
1924	14.5
1925	16.5
1926	16.0
1927	16.4
1928	16.2
1929	17.1
1930	16.0
1931	15.4
1932	18.7
1933	16.9
1934	16.4
1935	16.6
1936	16.2
1937	17.1
1938	17.7
1939	17.5
1940	14.5
1941	15.0
1942	17.6
1943	17.9
1944	19.6
1945	16.2
1946	16.2
1947	18.9
1948	16.4
1949	17.0
1950	17.5
1951	17.2
1952	17.8
1953	16.4
1954	15.8
1955	16.8
1956	14.1
1957	15.1
1958	16.9
1959	17.3
1960	15.8
1961	15.7
1962	15.8
1963	15.9
1964	15.9
1965	14.9
1966	15.5
1967	16.4
1968	16.4
1969	16.5
1970	16.8
1971	17.8
1972	15.7
1973	17.7
1974	17.1
1975	18.8
1976	16.2
1977	15.9
1978	15.1
1979	15.5
1980	16.6
1981	16.4
1982	17.3
1983	18.1
1984	17.0
1985	16.2
1986	16.3
1987	15.5
1988	17.0
1989	17.0
1990	18.3
1991	17.9
1992	19.1
1993	15.8
1994	17.8
1995	18.3
1996	17.2
1997	19.8
1998	16.7
1999	17.2
2000	17.6
2001	18.6
2002	18.8
2003	20.6
2004	18.4
2005	15.8
2006	15.5
2007	16.9
2008	17.4
2009	18.7
2010	16.7
2011	17.7
2012	18.4
2013	17.9
2014	16.0
2015	19.9
2016	17.7
2017	17.9
2018	19.9
2019	19.1
2020	20.0
2021	16.4