The definition of the weather categories and the selection of the cases of each category was done according to the instructions and recommendations of the World Meteorological Organization.
May was a relatively cold month for the first few days but
it became hot gradually from the middle of the period.
In parallel two significant dust episodes from Africa took
place at 5/5 and 17/5.
Also heavy thunderstorms with hail affected locally the
northwestern parts of Attica .....
