“ Global warming is taking a heavier toll than previously thought on a grueling 200-km speedskating marathon over frozen rivers and canals linking 11 towns in northern Holland. ” This and many other headlines appeared in the national and international media in response to an article that we (Visser and Petersen) published in 2009 in Climatic Change . Here, we provide an update and extension of the 2009 publication. We calculat...