An interesting find...
Please note that the 48.7 temperature in Athens is still being referred as official record within Greece.
Our understanding is that the National Observatory of Athens has recorded 48.7 in Tatoi and the Greek Met Office has recorded 48.0 on the same very day in Tatoi (apart from Elefsina),however the 48.0 has been registered as official since the National Observatory of Athens does not have the right within Greece to register official records etc.
However the 48.7 was indeed recorded by the National Observatory of Athens on 10/7/1977
Please find below all the places in Greece that registerd a temperature above 44.0
http://www.e-kairos.gr
Site/City Region Month Tmax (ºC) Date Comments
Tatoi/AP Attica 7 48.7 10/7/1977 Also 44.5C on 3/7/1998 and 43.6C on 25/7/2007.
Elefsina/AP Attica 7 48.0 10/7/1977 Previous record was 46C on 19/7/1973. Also 45.2C on 27/7/1987 and 25/7/2007 and 45C on 3/7/1998.
Nea Filadelfia/Athens 6 47.5 26/6/2007 From the automated HNMS weather station.
Trikala Thessaly 8 47.2 During the 1955-1994 period, the record seems to be 43C on 1st August 1985.
Lamia 7 46.5 19/7/1973 Also 45.6C on 25/7/2007 and 44C on 3/7/1998.
Pyrgela 6 46.4 26/6/2007 Previous record of 41.2C on 25/6/1982 was smashed.
Palaeochora Crete 7 46.2
Volos/AP Thessaly 7 46.2 19/7/1973 Also 43.6C on 25th July 2007 and 43C on 27/7/1987 and on 9/7/2000.
Nea Filadelfia/Athens Attica 6 46.2 26/6/2007 Previous record was +44.6C on 25/6/1982.
Sparta Peloponnese 8 46.0 24/8/1924
Astros Peloponnese 6 46.0 26/6/2007 Previous record was 42.2C on 16/6/1978 and was oh so smashed.
Tanagra/AP Central Continental Greece 7 46.0 19/7/1973 Also 43.0C on 25/7/2007 and 39.8C on 15/7/2008.
Ilion/Athens (AWS) Attica 6 45.9 26/6/2007 From the automated HNMS weather station.
Irakleio/city Crete 6 45.7 29/6/1916 From a HNMS station in the city of Irakleio, before the airport was built.
Larisa/AP Thessaly 7 45.4 5/7/2000 Previous record was 45.2C on 7/7/1988. Also 45C on 19/7/1973, 44.0C on 3/7/1998 and 43.8C on 27/7/1987.
Markopoulo/Ippasia (AWS) Attica 6 45.3 26/6/2007 Automated HNMS weather station.
Nea Ionia/Volos (HW) Thessaly 6 45.3 26/6/2007 The station exists since only 9/2006.
Monemvasia (NOA) Peloponnese 6 45.2 26/6/2007
Galatsi/Athens (Meteonet/NTUA) Attica 6 45.1 26/6/2007 The station exists since 6/2005.
Kalamata/AP Peloponnese 6 45.0 16/6/1916 The record was equalled on 24/6/2007. Also 41.8C and was measured on 25/6/1982. The 1916 observation was probably recorded at a different site than the later ones.
Velos Peloponnese 7 45.0 3/7/1998
Megara Attica 6 45.0 26/6/2007 No decimals available. May not be an all-year record. Quoted here for reference.
Aliartos Central Continental Greece 8 45.0 21/8/2006 Must be a record. Quoted here for reference.
Souda (NAGREF) Crete 6 45.0 26/6/2007 Maximum temperature for at least 20 years.
Zografou/Athens (Meteonet/NTUA) Attica 6 45.0 26/6/2007 The station exists since 8/2005.
Palaeochora (NOA) Crete 6 45.0 25/6/2007 44.3C on 24/6/2007. Watch the temperature go up and down as the hot katabatic northerly would frequently switch with the sea breeze. A maximum heat index of 52.2C was recorded. The station exists since only 9/2006.
Trikala (NOA) Thessaly 7 44.9 25/7/2007 Also 41.2C on 8/7/2008 and 39.8C on 15/7/2008. The station exists since only 3/2007.
Athens/Patission (HW) Attica 6 44.9 26/6/2007 The station exists since only 6/2007 and is on a roof.
Agrinio Western Greece 8 44.8 Also 43C on 21/8/2006.
Thisseio/Athens Attica 6 44.8 26/6/2007 Previous record was 43.0C on 21/6/1916 (Julian calendar, probably) and had been equalled on 2/7/1998.
Zappeio/Athens (AWS) Attica 6 44.8 26/6/2007 Automated HNMS weather station.
Volos (NOA) Thessaly 6 44.7 26/6/2007 The station is on a roof and exists since only 1/2007.
Serres Central Macedonia 7 44.6 25/7/2007 Previous record was 42.8C on 7/7/1988.
OAKA/Athens (AWS) Attica 6 44.6 26/6/2007 Automated HNMS weather station.
Kainourgio/Fthiotida (HW) Central Continental Greece 6 44.6 27/6/2007 The station exists since only 11/2006.
Votanikos/Athens Attica 7 44.5 2000 Presented station data for this month include years 1991-2001 only.
Acharnae/Athens (Meteonet/NTUA) Attica 6 44.4 26/6/2007 The station exists since 2/2005.
Acharnae/Athens (HW) Attica 6 44.4 26/6/2007 Also 36.7C on 19/6/2006. The station exists since only November 2005.
Irakleio/AP Crete 8 44.4 12/8/2002 Previous record was 38.2C on 26/8/1994 and was smashed in 2002, first through a 42C reading on 11/8/2002.
Goudi/Athens (AWS) Attica 6 44.3 26/6/2007 Automated HNMS weather station.
Pyrgos Western Greece 8 44.3 Also 41.8C on 21/8/2006.
Chalkida (HW) Central Continental Greece 6 44.3 27/6/2007 Also 39.6C on 19/6/2008. The station exists since only 1/2006.
Tanagra (NOA) Central Continental Greece 7 44.3 25/7/2007 Also 39.4C on 15/7/2008 and 38.4C on 8/7/2008. The station exists only since 7/2007.
Larisa (HW) Thessaly 7 44.3 25/7/2007 Also 41.1C on 8/7/2008. The station exists since only 10/2006.
Arta Epirus 7 44.2 5/7/1916
Chalkida Central Continental Greece 7 44.2
Gortys Crete 7 44.2
Nafplio Peloponnese 7 44.2
Volos/city Thessaly 7 44.2
El. Venizelos/Athens (AP) Attica 6 44.2 26/6/2007 Data since 1/2004 only.
Elos/Chania (NAGREF) Crete 6 44.2 26/6/2007 The station exists since only 6/2007 but this is probably a record for quite a long time.
Aegio Western Greece 7 44.1
Dafni (Monastery, AWS) Attica 6 44.1 26/6/2007 Automated HNMS weather station.
Kalampaka Thessaly 7 44.0
Karditsa Thessaly 7 44.0
Lidoriki Central Continental Greece 7 44.0
Tympaki Crete 7 44.0 3/7/1998 Record equalled on 25/7/2007. Also 41.0C on 24/7/2007. Systematic data in the database since 1/2010.
Thessaloniki/AP Central Macedonia 7 44.0 25/7/2007 Previous record was 42.4C on 5th July 2000. Also 42.0C on 7/7/1988 and on 19/7/1973.