NRCS Unbias Table

Beginning in the 1990s, the YSI 44019A thermistor with the 44211A thermilinear package (the extended-range YSI temperature sensor) replaced the YSI 44230 temperature sensor as the default temperature sensor used at SNOTEL sites because of its ability to measure a broader temperature range. Air temperature is calculated from sensor output voltage using a linear least-squares regression algorithm created by the Snow Survey and Water Supply Forecasting Program*. Use of the linear least-squares regression algorithm results in a data bias. More info here...

A white paper was created to highlight the process by which the temperature data was bias reduced. The white paper can be found here.

Air Temperature Bias Correction
For SNOtel, SNOLite, and SCAN Stations

Site Name	Status	Unbiased From	Unbiased To	Site ID	Lat.	Long.	Elev.	County	HUC

Air Temperature Bias CorrectionFor SNOtel, SNOLite, and SCAN Stations

Air Temperature Bias Correction
For SNOtel, SNOLite, and SCAN Stations