Many students were wearing jumpers under their blazers and coats on the top of their blazers, teachers were wearing coats when they were outside doing lunch duty
Disgrifiad o'r gweithgaredd
Bydd gwisgo siwmper yn y gaeaf yn arbed llawer o ynni ac arian gan y bydd angen llai o wres arnoch chi.
Bydd y gweithgaredd hwn yn annog disgyblion i ymchwilio i faint o blant ac oedolion sy'n gwisgo dillad cynnes ar ddiwrnodau oerach.
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