HRRR and Nam 3k has nearly always had somewhat of a warm bias here. I think it has to do with the ingested Data ; the quality and siting of official repoting Station's. As far as here in Lee County, it is a Fact regarding the Station's. Neither official Station is within NWS official Guidelines irt Siting. Both are within 10 feet of Metal Structures.
Also, the Airport Station's are governed by the FAA and are not as precise as NWS is irt Temperature accuracy guidelines. Allow 4 degree deviation either side of actual .