FAQ

How are monthly station to gridMET bias ratios calculated?

The default method for all variables except temperature:

1. Pair up daily station data with corresponding gridMET data.

2. For each month on record, select those that have at least 10 (default threshold) days of paired data.

3. Group all daily data by month, e.g. all dates that lie in the month of July.

4. Take the mean of the grouped station data and divide by the mean of the grouped gridMET data.

   • For temperature data the difference is calculated as opposed to station:gridMET ratios. In other words step 4. becomes: mean of grouped station minus the mean of grouped gridMET data.