Find out more about the evidence of the influence of extreme weather on the structure of Llyn Tegid and its ecological status
Particular attention is paid to the effects of the cold summer of 2010, the wet winter of 2014 and the windy summer of 2012.
Looking back, it was seen that the main reason for the periods of extreme weather was the instability of the jet stream.
The jet stream is a current that flows high in the air across the Atlantic and the path of the flow is mainly responsible for the location of areas of low pressure.
Until recently, the current followed the same path from year to year but, since the turn of the millennium, the seasonal pattern has changed.
In winter, it now follows a more tortuous path which allows more cold air to reach Britain from the Arctic.
In the summer, there is a tendency for it to move further south to create a wall that prevents high pressure from spreading from the continent.
No-one is sure what is responsible for the change but it is believed that the ice lost in the north is part of the answer along with cyclical changes in sea temperature