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HomeEducationalThe Sun and Solar ActivitySolar CycleYearly Mean Sunspot Numbers Sunday, Jul 05 2015 21:02 UT
The Sun and Solar Activity

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.

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
17005170111170216170323170436
170558 MAX17062917072017081017098
171031711017120 min17132171411
171527171647171763 MAX171860171939
172028172126172222172311 min172421
1725401726781727122 MAX1728 103172973
1730471731351732 1117335 min173416
1735341736701737 811738111 MAX1739101
1740731741401742 2017431617445 min
1745111746221747 40174860174980.9
175083.4 MAX175147.7175247.8175330.7175412.2
17559.6 min175610.2175732.4175847.6175954.0
176062.9176185.9 MAX176261.2176345.1176436.4
176520.9176611.4 min176737.8176869.81769106.1 MAX
1770100.8177181.6177266.5177334.8177430.6
17757.0 min177619.8177792.51778154.4 MAX1779125.9
178084.8178168.1178238.5178322.8178410.2 min
178524.1178682.91787132.0 MAX1788130.91789118.1
179089.9179166.6179260.0179346.9179441.0
179521.3179616.017976.417984.1 min17996.8
180014.5180134.0180245.0180343.1180447.5 MAX
180542.2180628.1180710.118088.118092.5
18100.0 min18111.418125.0181312.2181413.9
181535.4181645.8 MAX181741.1181830.1181923.9
182015.618216.618224.018231.8 min18248.5
182516.6182636.3182749.6182864.2182967.0
183070.9 MAX183147.8183227.518338.5 min183413.2
183556.91836121.51837138.3 MAX1838103.2183985.7
184064.6184136.7184224.2184310.7 min184415.0
184540.1184661.5184798.51848124.7 MAX184996.3
185066.6185164.5185254.1185339.0185420.6
18556.718564.3 min185722.7185854.8185993.8
186095.8 MAX186177.2186259.1186344.0186447.0
186530.5186616.318677.3 min186837.6186974.0
1870139.0 MAX1871 111.21872101.6187366.2187444.7
187517.0187611.3187712.418783.4 min18796.0
188032.3188154.3188259.7188363.7 MAX188463.5
188552.2188625.4188713.118886.818896.3 min
18907.1189135.6189273.0189385.1 MAX189478.0
189564.0189641.8189726.2189826.7189912.1
19009.519012.7 min19025.0190324.4190442.0
190563.5 MAX190653.8190762.0190848.5190943.9
191018.619115.719123.619131.4 min19149.6
191547.4191657.11917103.9 MAX191880.6191963.6
192037.6192126.1192214.219235.8 min192416.7
192544.3192663.9192769.0192877.8 MAX192964.9
193035.7193121.2193211.119335.7 min19348.7
193536.1193679.71937114.4 MAX1938109.6193988.8
194067.8194147.5194230.6194316.319449.6 min
194533.2194692.61947151.6 MAX1948136.31949134.7
195083.9195169.4195231.5195313.919544.4 min
195538.01956141.71957190.2 MAX1958184.81959159.0
1960112.3196153.9196237.6196327.9196410.2 min
196515.1196647.0196793.81968105.9 MAX1969105.5
1970104.5197166.6197268.9197338.0197434.5
197515.5197612.6 min197727.5197892.51979155.4 MAX
1980154.61981140.41982115.9198366.6198445.9
198517.9198613.4 min198729.41988100.21989157.6 MAX
1990142.21991145.8199294.5199354.7199429.9
199517.519968.6 min199721.6199864.2199993.4
2000119.6 MAX2001110.92002104.1200363.6200440.4
200529.8200615.220077.620082.9 min20093.1
201016.5201155.7201257.6201364.7201479.3
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