Hydrologists and climatologists often use the "Water Year" calendar for tracking water resources. While the definition may vary regionally, a common definition of "water year" is October 1 through September 30th.  In the cool months, evaporation rates are very low, snow accumulates in cold regions, storms tend to be widespread, and most areas see accumulation of moisture in the soil.  Then comes spring with it's accompanying snow melt and high runoff from mountainous regions and higher latitudes.  The summer months bring high evaporation rates.  Precipitation (much from thunderstorms) becomes much more localized.  Soil moisture may be gradually depleted during summer as vegetation uses large volumes of water.  Streams run slower and clearer.

CoCoRaHS recommends this water year calendar for tabulating precipitation amounts. If you are a CoCoRaHS observer, you can download the water year summary report for your station(s) from here or the "My Account" link in the top menu.

Don't have Excel?This blog post describes the options listed below:
View Excel files online without Microsoft Excel installed

Google Docs is a free online option that can import Excel files.

OpenOffice is free office software and includes a spreadsheet program that is compatible with Excel.

Please contact us at info@cocorahs.org with any questions or suggestions you have about the water year summaries or editing your reports.

CoCoRaHS Water Year Summary Reports By State/Province
Canada			2012 Water Year
Alabama	2010 Water Year	2011 Water Year	2012 Water Year
Alaska	2010 Water Year	2011 Water Year	2012 Water Year
Arizona	2010 Water Year	2011 Water Year	2012 Water Year
Arkansas	2010 Water Year	2011 Water Year	2012 Water Year
California	2010 Water Year	2011 Water Year	2012 Water Year
Colorado	2010 Water Year	2011 Water Year	2012 Water Year
Connecticut	2010 Water Year	2011 Water Year	2012 Water Year
Delaware	2010 Water Year	2011 Water Year	2012 Water Year
District of Columbia	2010 Water Year	2011 Water Year	2012 Water Year
Florida	2010 Water Year	2011 Water Year	2012 Water Year
Georgia	2010 Water Year	2011 Water Year	2012 Water Year
Hawaii	2010 Water Year	2011 Water Year	2012 Water Year
Idaho	2010 Water Year	2011 Water Year	2012 Water Year
Illinois	2010 Water Year	2011 Water Year	2012 Water Year
Indiana	2010 Water Year	2011 Water Year	2012 Water Year
Iowa	2010 Water Year	2011 Water Year	2012 Water Year
Kansas	2010 Water Year	2011 Water Year	2012 Water Year
Kentucky	2010 Water Year	2011 Water Year	2012 Water Year
Louisiana	2010 Water Year	2011 Water Year	2012 Water Year
Maine	2010 Water Year	2011 Water Year	2012 Water Year
Maryland	2010 Water Year	2011 Water Year	2012 Water Year
Massachusetts	2010 Water Year	2011 Water Year	2012 Water Year
Michigan	2010 Water Year	2011 Water Year	2012 Water Year
Minnesota	2010 Water Year	2011 Water Year	2012 Water Year
Mississippi	2010 Water Year	2011 Water Year	2012 Water Year
Missouri	2010 Water Year	2011 Water Year	2012 Water Year
Montana	2010 Water Year	2011 Water Year	2012 Water Year
Nebraska	2010 Water Year	2011 Water Year	2012 Water Year
Nevada	2010 Water Year	2011 Water Year	2012 Water Year
New Hampshire	2010 Water Year	2011 Water Year	2012 Water Year
New Jersey	2010 Water Year	2011 Water Year	2012 Water Year
New Mexico	2010 Water Year	2011 Water Year	2012 Water Year
New York	2010 Water Year	2011 Water Year	2012 Water Year
North Carolina	2010 Water Year	2011 Water Year	2012 Water Year
North Dakota	2010 Water Year	2011 Water Year	2012 Water Year
Ohio	2010 Water Year	2011 Water Year	2012 Water Year
Oklahoma	2010 Water Year	2011 Water Year	2012 Water Year
Oregon	2010 Water Year	2011 Water Year	2012 Water Year
Pennsylvania	2010 Water Year	2011 Water Year	2012 Water Year
Rhode Island	2010 Water Year	2011 Water Year	2012 Water Year
South Carolina	2010 Water Year	2011 Water Year	2012 Water Year
South Dakota	2010 Water Year	2011 Water Year	2012 Water Year
Tennessee	2010 Water Year	2011 Water Year	2012 Water Year
Texas	2010 Water Year	2011 Water Year	2012 Water Year
Utah	2010 Water Year	2011 Water Year	2012 Water Year
Vermont	2010 Water Year	2011 Water Year	2012 Water Year
Virginia	2010 Water Year	2011 Water Year	2012 Water Year
Washington	2010 Water Year	2011 Water Year	2012 Water Year
West Virginia	2010 Water Year	2011 Water Year	2012 Water Year
Wisconsin	2010 Water Year	2011 Water Year	2012 Water Year
Wyoming	2010 Water Year	2011 Water Year	2012 Water Year