Yearly Mean Sunspot Numbers

ASWFC is often asked about historical sunspot numbers. The table below, available from the National Geophysical Data Center in Boulder (USA), lists the yearly values of sunspot number from 1700.

MAX marks a sunspot cycle maximum and min a minimum. Up to 1944, yearly means were calculated as the average of the 12 monthly means; since 1945 yearly means have been calculated as the average of the daily means.

Year	Sunspot number	Year	Sunspot number	Year	Sunspot number	Year	Sunspot number	Year	Sunspot number
1700	5	1701	11	1702	16	1703	23	1704	36
1705	58 MAX	1706	29	1707	20	1708	10	1709	8
1710	3	1711	0	1712	0 min	1713	2	1714	11
1715	27	1716	47	1717	63 MAX	1718	60	1719	39
1720	28	1721	26	1722	22	1723	11 min	1724	21
1725	40	1726	78	1727	122 MAX	1728	103	1729	73
1730	47	1731	35	1732	11	1733	5 min	1734	16
1735	34	1736	70	1737	81	1738	111 MAX	1739	101
1740	73	1741	40	1742	20	1743	16	1744	5 min
1745	11	1746	22	1747	40	1748	60	1749	80.9
1750	83.4 MAX	1751	47.7	1752	47.8	1753	30.7	1754	12.2
1755	9.6 min	1756	10.2	1757	32.4	1758	47.6	1759	54.0
1760	62.9	1761	85.9 MAX	1762	61.2	1763	45.1	1764	36.4
1765	20.9	1766	11.4 min	1767	37.8	1768	69.8	1769	106.1 MAX
1770	100.8	1771	81.6	1772	66.5	1773	34.8	1774	30.6
1775	7.0 min	1776	19.8	1777	92.5	1778	154.4 MAX	1779	125.9
1780	84.8	1781	68.1	1782	38.5	1783	22.8	1784	10.2 min
1785	24.1	1786	82.9	1787	132.0 MAX	1788	130.9	1789	118.1
1790	89.9	1791	66.6	1792	60.0	1793	46.9	1794	41.0
1795	21.3	1796	16.0	1797	6.4	1798	4.1 min	1799	6.8
1800	14.5	1801	34.0	1802	45.0	1803	43.1	1804	47.5 MAX
1805	42.2	1806	28.1	1807	10.1	1808	8.1	1809	2.5
1810	0.0 min	1811	1.4	1812	5.0	1813	12.2	1814	13.9
1815	35.4	1816	45.8 MAX	1817	41.1	1818	30.1	1819	23.9
1820	15.6	1821	6.6	1822	4.0	1823	1.8 min	1824	8.5
1825	16.6	1826	36.3	1827	49.6	1828	64.2	1829	67.0
1830	70.9 MAX	1831	47.8	1832	27.5	1833	8.5 min	1834	13.2
1835	56.9	1836	121.5	1837	138.3 MAX	1838	103.2	1839	85.7
1840	64.6	1841	36.7	1842	24.2	1843	10.7 min	1844	15.0
1845	40.1	1846	61.5	1847	98.5	1848	124.7 MAX	1849	96.3
1850	66.6	1851	64.5	1852	54.1	1853	39.0	1854	20.6
1855	6.7	1856	4.3 min	1857	22.7	1858	54.8	1859	93.8
1860	95.8 MAX	1861	77.2	1862	59.1	1863	44.0	1864	47.0
1865	30.5	1866	16.3	1867	7.3 min	1868	37.6	1869	74.0
1870	139.0 MAX	1871	111.2	1872	101.6	1873	66.2	1874	44.7
1875	17.0	1876	11.3	1877	12.4	1878	3.4 min	1879	6.0
1880	32.3	1881	54.3	1882	59.7	1883	63.7 MAX	1884	63.5
1885	52.2	1886	25.4	1887	13.1	1888	6.8	1889	6.3 min
1890	7.1	1891	35.6	1892	73.0	1893	85.1 MAX	1894	78.0
1895	64.0	1896	41.8	1897	26.2	1898	26.7	1899	12.1
1900	9.5	1901	2.7 min	1902	5.0	1903	24.4	1904	42.0
1905	63.5 MAX	1906	53.8	1907	62.0	1908	48.5	1909	43.9
1910	18.6	1911	5.7	1912	3.6	1913	1.4 min	1914	9.6
1915	47.4	1916	57.1	1917	103.9 MAX	1918	80.6	1919	63.6
1920	37.6	1921	26.1	1922	14.2	1923	5.8 min	1924	16.7
1925	44.3	1926	63.9	1927	69.0	1928	77.8 MAX	1929	64.9
1930	35.7	1931	21.2	1932	11.1	1933	5.7 min	1934	8.7
1935	36.1	1936	79.7	1937	114.4 MAX	1938	109.6	1939	88.8
1940	67.8	1941	47.5	1942	30.6	1943	16.3	1944	9.6 min
1945	33.2	1946	92.6	1947	151.6 MAX	1948	136.3	1949	134.7
1950	83.9	1951	69.4	1952	31.5	1953	13.9	1954	4.4 min
1955	38.0	1956	141.7	1957	190.2 MAX	1958	184.8	1959	159.0
1960	112.3	1961	53.9	1962	37.6	1963	27.9	1964	10.2 min
1965	15.1	1966	47.0	1967	93.8	1968	105.9 MAX	1969	105.5
1970	104.5	1971	66.6	1972	68.9	1973	38.0	1974	34.5
1975	15.5	1976	12.6 min	1977	27.5	1978	92.5	1979	155.4 MAX
1980	154.6	1981	140.4	1982	115.9	1983	66.6	1984	45.9
1985	17.9	1986	13.4 min	1987	29.4	1988	100.2	1989	157.6 MAX
1990	142.2	1991	145.8	1992	94.5	1993	54.7	1994	29.9
1995	17.5	1996	8.6 min	1997	21.6	1998	64.2	1999	93.4
2000	119.6 MAX	2001	110.9	2002	104.1	2003	63.6	2004	40.4
2005	29.8	2006	15.2	2007	7.6	2008	2.9 min	2009	3.1
2010	16.5	2011	55.7	2012	57.6	2013	64.7	2014	79.3

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Yearly Mean Sunspot Numbers