NOUS41 KWBC 141519



Public Information Statement

National Weather Service Headquarters Washington DC

1120 AM EDT Thu Jul 14, 2011


TO:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS Partners, Users, and Employees


FROM:    Fiona Horsfall

         Chief, Climate Services Division


SUBJECT: Change to New 1981-2010 Climate Normals
         Effective  August 1.


The NWS will incorporate the new 1981-2010 Climate Normals into our climate text products on August 1. The products affected will be:


     Daily Climatological Report (CLI)

     Monthly Climatological Report (CLM)

     Quarterly Climatological Report (CLQ)

     Seasonal Climatological Report (CLS)

     Annual Climatological Report (CLA)

     Preliminary Local Climatological Data Report (CF6)


Any product that has data that crosses the August 1 implementation date, such as the quarterly, seasonal and annual Climatological Reports, will use the new 1981-2010 Climate Normals for required calculations for the entire period.


Products issued prior to the change date will not be reissued using the new climate Normals.


Climate Normals are calculated every 10 years and are an average of 30 years of climate data.  The calculations are done by The National Climatic Data Center.  More information can be found at;


If you have any question or comments, please contact:


    Jim Zdrojewski

    Climate Data Program Analyst

    Silver Spring, MD 20910

    301-713-1970 x181


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