The average sea temperature around Guernsey in the first week of April is 9.5C (49.1F), according to the island's meteorological office.
Already, average sea level rise has doubled in a decade due to the destabilisation of the Arctic and Greenland ice shelves.
And with scierntists predicting an average sea level rise of between 38 and 55cm by 2100, some small island states could disappear beneath the waves.
BBC: By BBC News Online Environment Correspondent Alex Kirby
Scientists suggest regions that have seen high sea level rises over the past 20 years will not necessarily continue to see higher than average sea-level rises in the future.
Mean sea level: average height of the sea surface over a 19-year period.
Average monthly Arctic sea ice extent data shows a clear deceasing trend since 1979.
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That may explain why the average tenure of a Seattle Sea Gal is only some four years.
Then there are the boats based in Northern Ireland, often staffed with diligent, sober Filipinos taking advantage of a loophole in the visa system, who cope with the privations of life at sea better than the average Scot.
The average temperature is above 40C, the sea is like a warm bath, the golden sand burns your feet and the ubiquitous tarmac is starting to sizzle.
Members of the Panama Swimming Club have been going into the sea at Whitley Bay an average of three times a week for about 40 years.
According to the National Snow and Ice Data Center, Arctic sea ice is melting faster than its average over the 1979 t0 2000 period.
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For the Arctic ice melt to make sense, all you have to do is watch this YouTube video, from the National Oceanic and Atmospheric Administration, which shows the puny extent of sea ice in 2012 compared with the historical average.
In the North Sea it has declined by 6% a year on average since 1999.
Specifically, the months of May, June, July, September and October have shown trends of increasing sea ice that are just slightly above the mean year-to-year average, the Center said on their website.
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The Maritime and Coastguard Agency said sea conditions had been moderate to rough on Friday, with a higher-than-average high tide.
That is part of the reason why the sea level is now rising at 3-3.5mm a year, twice the average annual rate in the 20th century.
Climate change models of Arctic sea ice cover in September, the month when ice is usually at its minimum, suggest an average loss of 2.5 percent of ice cover per decade from 1953 to 2003.
The study, published in the latest edition of the journal Geophysical Research Letters, found that the actual rate at which summer sea ice had shrunk per decade during the past 50 years was more than three times faster than an average of 18 of the most highly regarded climate simulations.
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