Monthly mean Wolf number recordet at Observatori de l'Ebre.
The Wolf number (W) is calculated on the basis of the number of groups (G) and sunspots (t) (W=10 G + t). This formula indicates that the appearance of a coherent group of sunspots (an active region) is more important that to add a few spots more to an already existing group.
| YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
| 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 | 97.4 | 77.5 | 84.0 | 70.3 |
| 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 | 35.3 | 10.9 | 3.5 | 0.8 |
| 2018 | 2.8 | 11.6 | 0.0 | 6.9 | 6.0 | 10.0 | 0.0 | 3.8 | 0.6 | 3.6 | 0.0 | 0.9 |
| 2019 | 5.0 | 0.0 | 6.8 | 5.1 | 8.0 | 0.0 | 0.0 | 1.0 | 0.6 | 0.0 | 0.0 | 2.2 |
| 2020 | 3.0 | 0.0 | 1.1 | 1.6 | 0.0 | 1.6 | 6.2 | 2.9 | 0.0 | 7.6 | 15.5 | 16.4 |
| 2021 | 4.6 | 3.8 | 8.1 | 7.5 | 10.7 | 19.6 | 20.0 | 10.3 | 40.9 | 24.5 | 25.7 | 35.3 |
| 2022 | 41.0 | 43.8 | 67.0 | 53.8 | 62.0 | 49.8 | 72.0 | 57.1 | 54.2 | 51.3 | 49.9 | 75.5 |
| 2023 | 92.6 | 86.1 | 79.2 | 49.7 |
