A method for determining the value of a temperature ( T') using raw data from a radio-frequency identification (RFID) tag, the RFID tag being energetically essentially passive, the method comprising: - obtaining a value ( TR cal0 ') of a first measurable quantity from the raw data, the first measurable quantity being indicative of the temperature, wherein the first measurable quantity depends on the temperature, - obtaining a value ( Δf' LF, f' osc, f' LF' P ') of a second measurable quantity, the second measurable quantity being indicative of the temperature or the measurement conditions of the first measurable quantity, and - determining the value of the temperature using calibration data, the value of the first measurable quantity, and the value of the second measurable quantity, wherein - the first measurable quantity is the value of the frequency-setting parameter (TRcal), at which a modulation frequency jump occurs ( TRcal0'), - the second measurable quantity is a frequency of a local oscillator ( f' osc), a backscattering frequency ( f' LF), a height of a frequency jump (Δ f' LF), or a signal strength indicator ( P '), and the value of the first measurable quantity is determined such that - a first response modulated at a first frequency (f LF1) is provided by sending a first interrogation signal comprising a first frequency-setting parameter (TRcal1) from a reader to the RFID tag, - a second response modulated at a second frequency (f LF2) is provided by sending a second interrogation signal comprising a second frequency-setting parameter (TRcal2) from a reader to the RFID tag, and - the first and second frequency-setting parameters (TRcal1, TRcal2) are selected by iteration such that a modulation frequency abruptly jumps from the first frequency (f LF1) to the second frequency (f LF2) at the value ( TRcal0') of the frequency-setting parameter (TRcal). - obtaining a value ( TR cal0 ') of a first measurable quantity from the raw data, the first measurable quantity being indicative of the temperature, wherein the first measurable quantity depends on the temperature, - obtaining a value ( Δf' LF, f' osc, f' LF' P ') of a second measurable quantity, the second measurable quantity being indicative of the temperature or the measurement conditions of the first measurable quantity, and - determining the value of the temperature using calibration data, the value of the first measurable quantity, and the value of the second measurable quantity, wherein - the first measurable quantity is the value of the frequency-setting parameter (TRcal), at which a modulation frequency jump occurs ( TRcal0'), - the second measurable quantity is a frequency of a local oscillator ( f' osc), a backscattering frequency ( f' LF), a height of a frequency jump (Δ f' LF), or a signal strength indicator ( P '), and the value of the first measurable quantity is determined such that - a first response modulated at a first frequency (f LF1) is provided by sending a first interrogation signal comprising a first frequency-setting parameter (TRcal1) from a reader to the RFID tag, - a second response modulated at a second frequency (f LF2) is provided by sending a second interrogation signal comprising a second frequency-setting parameter (TRcal2) from a reader to the RFID tag, and - the first and second frequency-setting parameters (TRcal1, TRcal2) are selected by iteration such that a modulation frequency abruptly jumps from the first frequency (f LF1) to the second frequency (f LF2) at the value ( TRcal0') of the frequency-setting parameter (TRcal).