1110 Helgoland, harbour and entrances
| Eiswinter | Anfang | Ende | Saisonlänge | Tage mit Eis | FL.Summe | Vol.Summe | max.Dicke | Restrictions |
| 1987 | 20.Jan 1987 | 21.Jan 1987 | 2 | 2 | 0.5 | 3.8 | 7.5 | nan | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1986 | 01.Mar 1986 | 14.Mar 1986 | 14 | 14 | 6.0 | 101.1 | 27.5 | nan | 9 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1985 | 19.Feb 1985 | 20.Feb 1985 | 2 | 2 | 1.5 | 41.2 | 27.5 | 30.0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1979 | 18.Jan 1979 | 23.Feb 1979 | 37 | 10 | 0.0 | 0.0 | 0.0 | nan | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1963 | 19.Jan 1963 | 04.Mar 1963 | 45 | 25 | 0.0 | 0.0 | 0.0 | 50.0 | 20 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1956 | 16.Feb 1956 | 26.Feb 1956 | 11 | 11 | 0.0 | 0.0 | 0.0 | 30.0 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1940 | 27.Jan 1940 | 23.Feb 1940 | 28 | 10 | 0.0 | 0.0 | 0.0 | nan | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |