Lake · Gwynedd · open water conditions information
Llyn Idwal is a lake in Gwynedd, one of 13 Gwynedd inland waters covered by NippyIndex.
As an inland water it is not tidal, so NippyIndex shows weather and surface conditions for it rather than a sea-state reading.
The information shown is drawn from published weather data and a seasonal surface-temperature model for UK inland waters.
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