b. A -99.0 value is used to fill in skipped daily data and to fill in measured
climate records so that all records have the same starting and ending
date. The starting date used for measured climate data is the earliest
starting date listed in any record while the ending date is the latest
ending date listed in any record. The –99.0 value is used to call the
weather generator to generate a value to replace the missing data
during run time.