"It's often the temperature which is the most significant factor in fatalities, " Mr Thompson said.

BBC: England

An MCA spokesman said the temperature of the water had been the deciding factor in the decision to call off the search on Sunday night.

BBC: No new search for Condor Rapide ferry missing woman

Another factor that affects the calculus is the outside temperature.

WSJ: Ralph Gardner Jr.: The Sport of Zamboni

Highly condensed lithium polymer battery delivers an incredible amount of juice in a small form factor and features built in overcharge, short circuit, and temperature protection.

ENGADGET: mophie launches $99.95 Juice Pack for iPod touch 2G