  We present the complete set of the measures of the CMB absolute temperature
on the basis on the works published in the literature, recognize the main
causes of error with the aim of estimating separately the magnitude of the
systematic and statistical errors, by focussing in particular on the most
recent observations. The main purpose of this work is to create a complete and
reasoned database of CMB absolute temperatures. The simple database format
permits a reading of the data through any text editor or through programs for
data handling. This is the first step for a statistical analysis of CMB
spectrum data and their comparison with the theoretical predictions for the
distorted spectra in order to derive constraints on physical processes at very
high redshifts.
