Although the modeling of the spread of a forest fire has made considerable progress recently, there remains a lack of reliable measurements of such fluctuating scalar quantities as temperature for the validation of the different existing models. This led us to use double thermocouples to measure fluctuating temperatures in the continuous flame region of a fire plume. An enthalpy balance to model the temperature of a thermocouple-junction immersed in a flame was written. Then a linearized first-order model was derived and a method for identifying the model's parameters, i.e., the time constant and gain coefficient, was provided. This model was tested with a clean, diffusion flame of ethanol to compensate for the gas temperature. These measurements agree with the model for the temperature of a thermocouple's hot junction. Finally, the compensated gas temperature for the turbulent flame of a fire spreading across a bed of pine needles was investigated.