The graphs are produced using daily rainfall data from the Patched Point data set and data from the department's automatic weather stations (AWS). When data for an AWS is unavailable, data from the geographically closest Patched Point station is used. For example, many of the AWS only began recording data recently, so historical data from the closest Patched Point station is used to create pseudo rainfall deciles.
UPDATE JUNE 2018: The update schedule has changed to provide more up-to-date rainfall data. To find out more, please see the Rainfall recordings and the update schedule section further below.