Thermal characteristics of coswirling flames with various axial and angular inlet momentum distributions are investigated in this experimental study. The heat loading, the Reynolds number, and the overall equivalence ratio were held constant while the swirl and flow distribution were systematically varied between the two air jets. Turbulent temperatures were measured with a fine-wire thermocouple in the recirculation zone, shear mixing, and postcombustion regions. A digital compensation technique was used to increase the maximum thermocouple frequency limit from approximately 50 Hz to over 1.5 kHz. The total swirl number and the total equivalence ratio were insufficient in characterizing thermal effects in these flames. Additional governing parameters are presented, which more accurately describe behavior in coannular burners. These parameters account for the swirl number in each jet, the relative jet strength, and the local stoichiometry at the inlet of the burner.