Forecast results are not OFFICIAL until Monday afternoon. The hi/low/precip is not "official" until we have had a chance to review the data from the weather station.
Max/Min for NWS site (KSLC) is highest/lowest temperature reported by metar reports for all 4 six hour periods from 0600 UTC Saturday to 0600 UTC Sunday. For the MesoWest site (CLN), it is the highest/lowest temperature reported from the station from 1am Saturday to 12am Sunday, local time.
Precipitation is the total precipitation accumulated during the same time period.