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Data from the VSX, SDSS DR12, and Gaia DR2 catalogs were combined in order toexplore the observed temperature distribution of known contact binaries.Color-temperature relations were applied to calculate the effectivetemperatures of approximately 20000 binaries and a temperature distribution wasbuilt using the results with a precision better than 160 K. The temperaturedistribution shifts to higher temperatures when increasing the distance of theobserved objects. The distribution contains a a previously detected bump in the6000-7000 K range. It is shown that this second maximum is caused by distantand highly reddened objects that are systematically more luminous than contactbinaries in this temperature range. We argue that these objects are othervariables, possibly semi-detached binaries, misclassified as contact binariesand that the actual temperature distribution of contact binaries does notcontain such a peak.

The observed temperature distribution of contact binaries derived from SDSS photometry