Water Year Data

The Water Year (or Hydrologic Year) is most often defined as the period from 01 October to 30 September of the following year. It is called by the calendar year in which it ends. Thus, Water Year 2009 is the 12-month period beginning 01 October 2008 and ending 30 September 2009. The period is chosen so as to encompass a full cycle of accumulation (mostly in the form of snowpack in the West) and use (irrigation, etc).

Precipitation

2009 Water Year Precipitation (NWS COOP Stations)

2008 Water Year Precipitation (NWS COOP Stations)

2007 Water Year Precipitation (NWS COOP Stations)

2006 Water Year Precipitation (NWS COOP Stations)

2005 Water Year Precipitation (NWS COOP Stations)

2004 Water Year Precipitation (NWS COOP Stations)

2003 Water Year Precipitation (NWS COOP Stations)