Water Year Precipitation Maps

2015 Hydro Year Precip RankingThe Water Year is defined as the period between October 1st of one year and September 30th of the next. This interval is often used by hydrologists because hydrological systems are typically at their lowest levels near October 1.

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YearTotal PrecipitationDeparture from NormalHistorical Ranking
2017mapmapmap
2016mapmapmap
2015mapmapmap
2014mapmapmap
2013mapmapmap
2012mapmapmap
2011mapmapmap
2010mapmapmap
2009mapmapmap
2008mapmapmap
2007mapmapmap
2006mapmapmap
2005mapmapmap
2004mapmapmap
2003mapmapnot available
2002mapmapnot available
2001mapmapnot available
2000mapmapnot available
1999mapmapnot available
1998mapmapnot available
1997mapmapnot available
1996mapmapnot available
1995mapmapnot available
1994mapnot availablenot available

 

GIS coverages available upon request. Contact cl[email protected]

  • Total Precipitation maps depict the Water Year precipitation totals in inches.
  • Departure from Normal maps depict the difference between the Water Year precipitation totals and the "normal", a 30 year average. The units are in inches.
  • Historical ranking maps depict Water Year precipitation totals as they rank when compared to Water Year totals over the modern record. The values presented are percentiles. A ranking near zero indicates the year was drier than any found during the period of record. A ranking near 100 designates that the year was wetter than any found on record. A ranking of 50 is equivalent to the "median", a measure of central tendency.

 

For more information contact: [email protected]