Nombre de Wolf mitjà mensual enregistrat a l'Observatori de l'Ebre.

El Nombre de Wolf (W) es calcula en base al nombre de grups (G) i taques (t) (W=10 G + t). Aquesta fórmula indica que l'aparició d’un grup coherent de taques (una regió activa) és molt més important que afegir unes taques més a un grup ja existent. 

ANY GEN FEB MAR ABR MAI JUN JUL AGO SET OCT NOV DES
1943 15.5 29.3 32.0 32.1 15.7 8.2 12.3 22.1 10.2 6.4 11.8 16.8
1944 4.3 0.9 13.2 0.0 0.5 5.4 4.0 21.8 14.6 20.5 16.1 32.9
1945 21.2 16.5 23.2 35.0 33.4 47.1 48.8 31.1 36.8 80.0 58.0 29.4
1946 60.7 108.0 98.5 95.1 109.2 96.7 147.5 143.3 121.9 116.5 147.7 124.4
1947 134.5 148.8 149.5 159.1 207.3 163.3 153.9 186.3 169.1 179.2 160.4 123.0
1948 117.2 106.1 104.3 198.5 147.8 144.5 124.7 151.0 134.9 125.0 92.4 120.8
1949 115.8 167.5 153.4 151.8 117.3 120.9 120.1 124.4 138.9 137.1 143.8 116.3
1950 104.8 84.8 122.5 103.4 119.7 77.3 82.0 85.1 53.9 68.1 58.2 52.3
1951 49.1 65.4 60.9 86.9 93.1 82.0 57.9 51.7 84.3 57.7 69.2 48.6
1952 46.8 28.9 27.8 30.7 31.8 46.0 46.3 63.2 31.9 25.2 19.6 32.9
1953 27.1 5.0 13.4 24.7 12.0 25.0 8.6 27.3 19.2 10.7 3.5 3.9
1954 1.5 0.4 8.7 1.8 0.5 0.0 5.4 10.9 3.0 9.9 12.5 11.8
1955 26.8 25.4 7.9 18.0 33.4 34.9 37.5 50.0 56.0 56.6 100.5 81.1
1956 89.6 135.3 160.1 152.0 149.6 130.1 127.5 181.1 189.3 156.3 192.4 204.6
1957 172.1 140.6 191.3 204.6 173.2 188.3 185.7 165.0 232.0 275.6 221.6 255.0
1958 249.4 176.7 200.1 219.1 203.8 181.5 193.2 216.3 223.2 206.4 179.7 209.1
1959 271.0 169.5 211.9 171.6 142.1 151.4 132.1 183.6 136.1 110.3 113.7 109.4
1960 149.1 114.4 115.7 133.1 130.4 121.4 126.0 135.0 129.4 79.2 102.0 85.8
1961 56.5 55.0 61.7 69.3 53.1 70.0 60.4 44.3 56.3 38.2 36.8 46.8
1962 40.7 38.8 32.2 41.6 34.4 35.7 17.9 22.0 45.4 39.3 26.0 20.3
1963 21.2 23.0 12.8 25.9 32.6 29.9 12.9 24.2 35.0 36.5 24.5 18.0
1964 20.5 19.4 20.6 12.2 13.3 12.6 5.0 13.1 7.0 9.6 9.6 18.5
1965 25.3 20.5 18.3 12.7 28.1 18.5 14.7 10.9 22.0 22.9 20.5 19.6
1966 31.4 31.7 27.4 51.8 63.3 61.9 72.5 69.4 61.5 78.8 79.3 92.8
1967 143.4 126.9 145.8 94.8 134.5 89.4 119.3 147.2 99.5 112.5 110.8 142.5
1968 130.4 132.4 109.1 96.6 159.3 141.9 112.9 131.9 139.7 127.9 103.2 118.5
1969 110.1 126.9 177.0 142.1 164.4 128.8 127.4 119.6 114.2 123.1 119.1 118.5
1970 151.8 173.0 154.0 148.2 168.7 151.5 160.8 137.7 144.8 133.4 138.6 121.9
1971 123.3 115.7 90.7 108.6 85.7 81.6 124.2 86.3 72.4 65.0 68.6 102.4
1972 73.0 97.5 100.5 82.1 85.9 101.4 101.4 91.1 90.0 62.5 37.6 44.8
1973 41.1 41.0 50.6 65.8 50.3 48.0 32.1 31.5 66.4 32.2 24.7 22.6
1974 31.7 30.7 28.2 45.4 41.1 42.4 55.2 41.2 43.5 48.3 28.2 20.2
1975 20.6 10.9 10.1 4.5 9.2 12.8 42.1 42.9 16.3 9.1 18.6 6.7
1976 7.1 4.5 21.6 19.7 14.3 13.4 2.6 15.8 12.8 18.7 5.3 14.1
1977 19.8 23.2 6.0 7.3 17.2 38.5 21.8 34.7 54.9 50.6 34.0 47.4
1978 57.5 93.9 88.8 115.9 99.2 124.7 70.3 62.1 167.3 144.8 106.0 128.7
1979 188.9 143.5 168.3 103.0 159.9 187.2 196.3 177.3 244.5 228.3 200.8 185.2
1980 139.7 165.0 144.0 153.1 237.0 201.1 181.0 184.1 236.0 212.3 158.4 185.4
1981 117.1 149.6 172.1 226.5 214.0 127.2 204.3 276.3 270.2 210.9 186.4 162.7
1982 124.3 195.8 171.6 154.2 117.3 143.7 142.7 154.4 145.8 113.8 109.7 113.2
1983 90.2 60.1 73.3 87.6 106.7 105.7 91.9 83.7 48.8 59.2 32.4 37.9
1984 54.9 71.3 91.2 69.5 84.7 60.6 51.7 30.5 16.9 11.2 18.2 12.6
1985 8.7 17.6 11.0 14.1 24.8 27.7 39.9 7.8 3.5 19.4 13.4 14.4
1986 1.3 20.3 7.8 20.3 12.3 .0 15.8 7.9 4.4 33.3 11.8 5.2
1987 6.0 1.3 15.3 43.1 31.9 13.8 32.7 39.7 38.6 49.0 23.6 15.6
1988 38.4 38.4 71.2 101.6 66.5 124.1 110.2 117.5 142.7 161.7 139.1 171.9
1989 186.2 179.9 125.1 123.0 159.5 229.3 144.9 179.5 174.2 171.8 186.2 146.7
1990 182.7 137.7 157.6 162.5 163.3 136.2 159.1 227.4 154.5 177.0 116.0 148.5
1991 157.9 199.4 166.3 144.7 129.4 170.8 191.6 218.0 142.5 158.0 124.8 154.9
1992 151.9 186.5 112.2 101.3 67.1 76.6 89.8 74.3 75.8 108.8 99.5 91.4
1993 70.8 97.7 67.6 64.3 57.4 48.7 60.2 47.8 18.5 44.9 36.0 46.5
1994 53.2 35.1 36.1 15.8 18.5 26.9 43.8 26.0 32.8 48.2 16.8 24.7
1995 28.1 34.9 33.9 16.1 14.9 19.6 17.0 13.6 12.7 23.9 10.3 6.3
1996 8.1 2.8 10.5 3.3 5.1 13.6 7.8 15.7 1.3 .0 11.0 8.7
1997 2.4 9.5 10.7 21.4 23.0 17.3 10.3 30.3 57.4 25.6 41.5 41.1
1998 32.0 46.5 74.4 65.0 64.7 84.8 87.0 122.4 118.4 67.3 69.9 99.8
1999 58.3 74.1 87.9 76.9 146.2 210.3 164.1 133.4 101.3 145.9 146.9 88.5
2000 121.3 138.1 184.9 157.5 152.2 173.5 207.1 180.0 134.8 114.8 126.3 116.5
2001 94.1 104.9 138.8 129.1 104.7 147.1 98.4 127.6 171.4 155.1 126.4 166.9
2002 142.3 142.4 129.1 153.0 159.1 122.6 142.1 155.8 163.8 152.1 117.6 104.0
2003 108.4 83.1 90.5 91.8 81.7 115.3 130.8 112.7 69.5 95.6 62.1 72.0
2004 44.9 63.7 61.7 56.9 65.7 53.9 69.2 62.3 42.4 35.3 51.5 23.7
2005 34.3 37.6 46.7 38.4 54.1 52.5 55.4 53.2 35.7 9.9 28.3 54.3
2006 28.5 5.3 12.5 45.4 32.4 16.5 20.1 15.3 24.4 15.9 26.3 16.4
2007 26.6 14.6 5.3 5.5 13.3 19.5 15.1 8.9 3.8 1.5 1.8 12.9
2008 2.7 2.4 11.1 3.8 6.7 4.1 0.8 0.4 0.0 5.0 4.7 1.6
2009 0.7 2.1 0.0 0.0 1.7 5.7 3.1 0.0 7.8 5.1 4.4 8.6
2010 14.0 23.9 24.6 12.8 12.6 17.1 19.0 25.2 26.4 29.3 29.1 20.6
2011 27.9 30.3 62.5 67.3 52.6 46.4 56.8 56.8 102.9 109.8 128.2 97.5
2012 82.3 44.2 82.2 70.4 93.7 82.8 63.8 82.3 94.4 64.6 83.8 57.0
2013 98.2 41.8 74.7 96.1 105.8 66.1 71.9 85.4 50.1 101.2 81.2 94.2
2014 88.0 119.4 109.0 83.6 98.9 76.2 72.8 89.9 94.3  77.5 84.0  69.3
2015 73.4  49.1  34.4 62.2  71.1 55.4  58.4  42.8  51.0  43.9  40.2  39.2
2016 35.1 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
2017 ---- ---- ---- ---- 12.0 16.5  13.2  28.9