Hipparchus, Calendars and Weather Prediction

Hipparchus (flourished during second half of second century BC) appears to have produced a calendar, of a traditional type perhaps dating back to at least the fifth century BC, which listed the risings and settings of stars and associated weather indications. References made by Ptolemy (second century AD), in his Phases of the Fixed Stars and Collection of Weather Signs, suggest that Hipparchus was one of his sources, but Hipparchus' own astrometeorological calendar is now lost.