After another wet British summer there is a suggestion that a warmer Atlantic means that there will be more on the way in coming years.
Scientists at the University of Reading are investigating patterns of change.
Professor Rowan Sutton, the director of climate research at the National Centre for Atmospheric Science at the university, told the Today programme that while global warming is partly responsible, more research is needed to fully understand changes in the British summer climate.
He said: "We understand very well the way the planet is warming up as a whole. For aspects of the weather such as wet summers, we need to understand a lot more about the details of the factors that influence particular regions, particularly on timescales of decades.
"The recent swings we do think have been affected by human activities - that's both the increase in greenhouse gases and also other forms of pollution that generate little particles in the atmosphere called aerosols."
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