Thermistor resistance is related to temperature in degrees Kelvin by the following formula:
\[ \frac{1}{T} = A + B \cdot \ln\left(\frac{R}{R_t}\right) + C \cdot \ln^2\left(\frac{R}{R_t}\right) + D \cdot \ln^3\left(\frac{R}{R_t}\right) \]
In the standard Steinhart-Hart equation, the C parameter is typically set to zero.
Subtract 273.15 to convert Kelvin to Celsius.