Data for the mean Earth temperatur: - For example, the average annual temperature for the globe between 1951 and 1980 was around 57.2 degrees Fahrenheit (14 degrees Celsius). (UCAR). - The global mean surface temperature is 14.46 °C computed from MODIS data (2001-2012). - Estimated Jan 1951-Dec 1980 global mean temperature (°C) - using air temperature above sea ice: 14.72 The method is described for example Rohde (2013) "Berkeley Earth Temperature Averaging Process". The averaged temperature is the integral of the local temperatures above the surface. There are corrections for latitude, elevation and “geographic anomaly”. In my opinion air pressure and humidity must also be taken into account. Does this temperature have a physical meaning?