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How long did sea ice cover Iceland during the 19th century?

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Line graph showing estimated temperature variations from 1000 to 2000 CE for the Northern Hemisphere and central England, with three lines representing different data sources. The chart highlights the medieval warm period around 1100-1300 and the Little Ice Age from about 1500 to 1850, followed by a sharp temperature rise in the late 20th century. Temperature is shown as deviations from the 1961-1990 average. — Little Ice Age Estimates of temperature variations for the Northern Hemisphere and central England from 1000 to 2000 ce.

During the Little Ice Age, Iceland experienced significant increases in sea ice coverage. While there was zero average coverage before the year 1200, this duration grew to eight weeks in the 13th century and reached 40 weeks during the 19th century.1