How many years of data are used to calculate CIMIS`s historical (long-term average) data?
The number of years for historical averages vary by station, it ranges from 5 to 11 years. These averages were computed in 2000 from data collected between 1989 and 1999, and for stations that had at least 5 years of data then. Regional averages were assigned to stations that did not have at least 5 years of data. That is, averages were computed from stations within the region that met the 5 year data limit. It was felt that weather during the 5 years prior to and including 1999 was fairly representative of California average weather conditions.
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