Summary Baltic Sea Ice maximum 1960-1964 based on historical weather service observations. Description This dataset was compiled by Finnish Meteorological Institute (http://en.fmi.fi/) based on historical weather service observations (1960-1964) on sea ice extent in the Baltic Sea. The maximum ice extent map shows the areas which were at least once covered by ice within the study period. The maps were derived by digitizing existing ice extent maps to picture format and then to GIS shapefiles. Due to this reason the ice extent area should be considered as indicative especially within coastal areas. For further information, see http://www.iceservice.fi/.

Summary Baltic Sea Ice Maximum 2005-2009 based on weather service observations on sea ice extent in the Baltic Sea from satellite observations. Description This dataset was compiled by Finnish Meteorological Institute (http://en.fmi.fi/) based on weather service observations on sea ice extent in the Baltic Sea from satellite observations (2005-2009). The maximum ice extent map shows the areas which were at least once covered by ice within the study period. The maps were derived by digitizing existing ice extent maps to picture format and then to GIS shapefiles. Due to this reason the ice extent area should be considered as indicative especially within coastal areas. For further information, see http://www.iceservice.fi/.

Summary Baltic Sea Ice Minimum 2005-2009 based on weather service observations on sea ice extent in the Baltic Sea from satellite observations. Description This dataset was compiled by Finnish Meteorological Institute (http://en.fmi.fi/) based on weather service observations on sea ice extent in the Baltic Sea from satellite observations (2005-2009). The minimum ice extent map displays the area which was covered by ice in every year of the study period. The maps were derived by digitizing existing ice extent maps to picture format and then to GIS shapefiles. Due to this reason the ice extent area should be considered as indicative especially within coastal areas. For further information, see http://www.iceservice.fi/.

Summary Baltic Sea Ice Minimum 1960-1964 based on historical weather service observations on sea ice extent in the Baltic Sea Description This dataset was compiled by Finnish Meteorological Institute (http://en.fmi.fi/) based on historical weather service observations (1960-1964) on sea ice extent in the Baltic Sea. The minimum ice extent map displays the area which was covered by ice in every year of the study period. The maps were derived by digitizing existing ice extent maps to picture format and then to GIS shapefiles. Due to this reason the ice extent area should be considered as indicative especially within coastal areas. For further information, see http://www.iceservice.fi/.