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Wilmington, Ohio

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New Climate Normals to be Implemented in August

The National Climatic Data Center (NCDC) is responsible for producing 30 year climate normals for thousands of locations across the United States. Each decade, these normals are updated, dropping the oldest decade and adding the newest. The new climate normals including the years 1981-2010 will be implemented in National Weather Service products the first week of August, replacing those valid from 1971-2000. These include the daily (CLI, CF6) and monthly (CLM) climate products that the National Weather Service in Wilmington issues for our three major climate stations, Cincinnati-Northern Kentucky International Airport (CVG), Dayton International Airport (DAY), and Port Columbus International Airport (CMH).

Additional information is available from the National Climatic Data Center (NCDC) at the following web address:
Follow the link to the PDF presentation for details on how the normals were calculated as well as for nationwide comparisons.

Here are the new normals for our local stations in tabular format (PDF files)(please note that the daily temperatures have been rounded to whole degrees):

Plots comparing the differences between the 1971-2000 and 1981-2010 normals can be found in the following links. Some reflection of swapping the cool 1970s decade for the warm 2000s decade can be seen. Low temperatures show a distinctive warming trend, although high temperatures vary. Yearly precipitation is similar for CVG, but increases at CMH and DAY. Average yearly snowfall decreases at all three stations.
Cincinnati Plots
Columbus Plots
Dayton Plots
(please note that the 1971-2000 daily temperatures are in whole degrees, while the new 1981-2010 values are in tenths of a degree)

If you have any questions, please contact Don Hughes, Observing Program Leader (OPL), via email at or by phone at 937-383-0031.

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Wilmington Ohio Weather Forecast Office
1901 South State Route 134
Wilmington, OH 45177
Tel: (937) 383-0031
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Page last modified: July 31, 2011.
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