An approach to calibrate temperature compensation for hot-film crosswind sensors is proposed. The crosswind sensor consists of a pair of platinum films which are closely spaced by the bridging material. A resistive thermal detector (RTD) with positive temperature coefficient is employed to compensate for variations in ambient temperature. Given the temperature coefficients of platinum films and the RTD, temperature compensation can be easily made outside wind tunnels by setting a variable resistor to a calculated value. Theoretical analysis and tests in the wind tunnel show that the approach is simple and accurate.