According to the Köppen Climate Classification system, Nea Filadelfeia, like most of Athens, has a hot-summer Mediterranean climate, abbreviated “Csa” on climate maps. Winters are mild with mean January temperatures above 8 degrees Celsius (46 degrees Fahrenheit), while summers can be particularly hot with mean maximum July temperatures in their mid 30 °C (86 °F)’s. Nea Filadelfeia is notorious in Greece for its summer heat; according to H.N.M.S it registers Greece’s highest mean maximum summer temperatures for the period 1955-1997. On 26 June 2007, the H.N.M.S climatological station of Filadelfeia recorded 46.2 °C (115.2 °F), with the H.N.M.S. weather station nearby recording 47.5 °C (117.5 °F) on the same day. For the 1987-2016 period, the mean maximum July temperature for Nea Filadelfeia stands at 34.8 °C (94.6 °F).