The National Centers for Environmental Information (NCEI) has launched a new divisional climate dataset called nClimDiv. This dataset replaces the traditional Drd964x values that NCEI and the ONJSC have used for many years.
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The National Centers for Environmental Information (NCEI) has launched a new divisional climate dataset called nClimDiv. This dataset replaces the traditional Drd964x values that NCEI and the ONJSC have used for many years.

The Drd964x dataset approach computed climate division values from 1931 forward by averaging monthly data for all National Weather Service Cooperative Observer Network (COOP) stations in each division (NJ has three) to obtain monthly divisional mean temperature and precipitation (a different method was employed for the 1895-1930 period). Statewide values were then obtained by weighting the divisions by their size.

The nClimDiv approach provides an improved and more reliable gauge of divisional and statewide climate values. Improvements include the incorporation of additional station data and contemporary bias adjustments, as well as the implementation of climatologically-aided gridded interpolation to address variations in topography and network density that generates data values at a 5 km resolution. Moving forward, the ONJSC will utilize and post climate data from the nClimDiv dataset. In the near future, we will also publish a report documenting differences between the Drd964x and nClimDiv datasets in the context of NJ’s climate history.

To learn more about nClimDiv, please visit the National Centers for Environmental Information's nClimDiv Landing Page.
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Middlesex County, NJ

Monthly Total Precipitation (in.)