Sunspot Number

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Year Sunspot number Year Sunspot number Year Sunspot number Year Sunspot number Year Sunspot number

1700 5

1701 11 1761 85.9 MAX 1821 6.6 1881 54.3 1941 47.5

1702 16 1762 61.2 1822 4.0 1882 59.7 1942 30.6

1703 23 1763 45.1 1823 1.8 min 1883 63.7 MAX 1943 16.3

1704 36 1764 36.4 1824 8.5 1884 63.5 1944 9.6 min

1705 58 MAX 1765 20.9 1825 16.6 1885 52.2 1945 33.2

1706 29 1766 11.4 min 1826 36.3 1886 25.4 1946 92.6

1707 20 1767 37.8 1827 49.6 1887 13.1 1947 151.6 MAX

1708 10 1768 69.8 1828 64.2 1888 6.8 1948 136.3

1709 8 1769 106.1 MAX 1829 67.0 1889 6.3 min 1949 134.7

1710 3 1770 100.8 1830 70.9 MAX 1890 7.1 1950 83.9

1711 0 1771 81.6 1831 47.8 1891 35.6 1951 69.4

1712 0 min 1772 66.5 1832 27.5 1892 73.0 1952 31.5

1713 2 1773 34.8 1833 8.5 min 1893 85.1 MAX 1953 13.9

1714 11 1774 30.6 1834 13.2 1894 78.0 1954 4.4 min

1715 27 1775 7.0 min 1835 56.9 1895 64.0 1955 38.0

1716 47 1776 19.8 1836 121.5 1896 41.8 1956 141.7

1717 63 MAX 1777 92.5 1837 138.3 MAX 1897 26.2 1957 190.2 MAX

1718 60 1778 154.4 MAX 1838 103.2 1898 26.7 1958 184.8

1719 39 1779 125.9 1839 85.7 1899 12.1 1959 159.0

1720 28 1780 84.8 1840 64.6 1900 9.5 1960 112.3

1721 26 1781 68.1 1841 36.7 1901 2.7 min 1961 53.9

1722 22 1782 38.5 1842 24.2 1902 5.0 1962 37.6

1723 11 min 1783 22.8 1843 10.7 min 1903 24.4 1963 27.9

1724 21 1784 10.2 min 1844 15.0 1904 42.0 1964 10.2 min

1725 40 1785 24.1 1845 40.1 1905 63.5 MAX 1965 15.1

1726 78 1786 82.9 1846 61.5 1906 53.8 1966 47.0

1727 122 MAX 1787 132.0 MAX 1847 98.5 1907 62.0 1967 93.8

1728 103 1788 130.9 1848 124.7 MAX 1908 48.5 1968 105.9 MAX

1729 73 1789 118.1 1849 96.3 1909 43.9 1969 105.5

1730 47 1790 89.9 1850 66.6 1910 18.6 1970 104.5

1731 35 1791 66.6 1851 64.5 1911 5.7 1971 66.6

1732 11 1792 60.0 1852 54.1 1912 3.6 1972 68.9

1733 5 min 1793 46.9 1853 39.0 1913 1.4 min 1973 38.0

1734 16 1794 41.0 1854 20.6 1914 9.6 1974 34.5

1735 34 1795 21.3 1855 6.7 1915 47.4 1975 15.5

1736 70 1796 16.0 1856 4.3 min 1916 57.1 1976 12.6 min

1737 81 1797 6.4 1857 22.7 1917 103.9 MAX 1977 27.5

1738 111 MAX 1798 4.1 min 1858 54.8 1918 80.6 1978 92.5

1739 101 1799 6.8 1859 93.8 1919 63.6 1979 155.4 MAX

1740 73 1800 14.5 1860 95.8 MAX 1920 37.6 1980 154.6

1741 40 1801 34.0 1861 77.2 1921 26.1 1981 140.4

1742 20 1802 45.0 1862 59.1 1922 14.2 1982 115.9

1743 16 1803 43.1 1863 44.0 1923 5.8 min 1983 66.6

1744 5 min 1804 47.5 MAX 1864 47.0 1924 16.7 1984 45.9

1745 11 1805 42.2 1865 30.5 1925 44.3 1985 17.9

1746 22 1806 28.1 1866 16.3 1926 63.9 1986 13.4 min

1747 40 1807 10.1 1867 7.3 min 1927 69.0 1987 29.4

1748 60 1808 8.1 1868 37.6 1928 77.8 MAX 1988 100.2

1749 80.9 1809 2.5 1869 74.0 1929 64.9 1989 157.6 MAX

1750 83.4 MAX 1810 0.0 min 1870 139.0 MAX 1930 35.7 1990 142.2

1751 47.7 1811 1.4 1871 111.2 1931 21.2 1991 145.8

1752 47.8 1812 5.0 1872 101.6 1932 11.1 1992 94.5

1753 30.7 1813 12.2 1873 66.2 1933 5.7 min 1993 54.7

1754 12.2 1814 13.9 1874 44.7 1934 8.7 1994 29.9

1755 9.6 min 1815 35.4 1875 17.0 1935 36.1 1995 17.9

1756 10.2 1816 45.8 MAX 1876 11.3 1936 79.7

1757 32.4 1817 41.1 1877 12.4 1937 114.4 MAX

1758 47.6 1818 30.1 1878 3.4 min 1938 109.6

1759 54.0 1819 23.9 1879 6.0 1939 88.8

1760 62.9 1820 15.6 1880 32.3 1940 67.8

From http://www.ips.gov.au/Educational/2/3/6 Yearly Mean Sunspot Numbers IPS 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 to 1995. 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.

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 17.9 From http://www.ips.gov.au/Educational/2/3/6
Cycle Started,Finished,Duration(yrs),Max(mo SSN (Smoothed Sunspot Number),Min(mo. SSN; end of cycle),Spotless days (end of cycle) Solar minimum events and approximate dates Event Start End Homeric minimum 950BC 800BC Oort minimum 1040 1080 (see Medieval Warm Period) Medieval maximum 1100 1250 (see Medieval Warm Period) Wolf minimum 1280 350 Sp�rer Minimum 1450 1550 Maunder Minimum 1645 1715 Little Ice Age Dalton Minimum 1790 1820 Modern Maximum 1900 present

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 End Maunder Min 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
SC 1 55 Mar-66 Jun 11.3,86.5 (Jun 1761) 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
SC2 66 Jun-75 Jun 9.0,115.8 (Sep 1769),7.2 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
SC3 75 Jun-84 Sep 9.3,158.5 (May 1778),9.5 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
SC4 84 Sep-98 May 13.7,141.2 (Feb 1788),3.2 1784 10.2 min 1785 24.1 1786 82.9 1787 132.0 MAX 1788 130.9 1789 118.1 1790 89.9 Start Dalton Min 1791 66.6 1792 60.0 1793 46.9 1794 41.0 1795 21.3 1796 16.0 1797 6.4
SC5 98 May-10 Dec 12.6,49.2 (Feb 1805),0.0 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
SC6 10 Dec-23 May 12.4,48.7 (May 1816),0.1 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 End Dalton Min 1821 6.6 1822 4.0

SC7 23 May-33 Nov 10.5,71.5 (Nov 1829),7.3 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
SC8 33 Nov-43 Jul 9.8,146.9 (Mar 1837),10.6 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
SC9 43 Jul-55 Dec 12.4,131.9 (Feb 1848),3.2,~654 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
SC10 55 Dec-67 Mar 11.3,98.0 (Feb 1860),5.2,~406 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
SC11 67 Mar-78 Dec 11.8,140.3 (Aug 1870),2.2,~1028 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
SC12 78 Dec-90 Mar 11.3,74.6 (Dec 1883),5.0,~736 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
SC13 90 Mar-02 Feb 11.9,87.9 (Jan 1894),2.7,~938 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 Begin Modern Maximum

SC14 02 Feb-13 Aug 11.5,64.2 (Feb 1906),1.5,~1019 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
SC15 13 Aug-23 Aug 10.0,105.4 (Aug 1917),5.6,534 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
SC16 23 Aug-33 Sep,10.1 78.1 (Apr 1928),3.5,568 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
SC17 33 Sep-44 Feb 10.4,119.2 (Apr 1937),7.7,269 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
SC18 44 Feb-54 April 10.2,151.8 (May 1947),3.4,446 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
SC19 54 April-64 Oct 10.5,201.3 (Mar 1958),9.6,227 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
SC20 64 Oct-76 Jun 11.7,110.6 (Nov 1968),12.2,272 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

SC21 76 Jun-86 Sep 10.3,164.5 (Dec 1979),12.3,273 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
SC22 86 Sep-96 May 9.7,158.5 (Jul 1989),8.0,309 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 17.9
SC23 96 May-08 Jan 11.7,120.8 (Mar 2000),1.7,821 1996 8.5 min 1997 21.5 1999 64.3 2000 119.6 MAX 2001 111 2002 104 2003 63.7 2004 40.4 2005 29.8 2006 15.2 2007 7.5
SC24 2008 Jan 2008 2.9 Min 2009 3.1 2010 16.5 2011 55.7 2012 57.7 2013 64.9 2014 2015 ---