National Weather Service United States Department of Commerce

As part of a nationwide ThreadEx expansion, climate records for Greenville, MS now incorporate data beginning in 1903. Previously, Greenville climate records used data dating back to 1920.

ThreadEx is a national project designed to address the fragmentation of station information over time due to station relocations for the express purpose of calculating daily extremes of temperature and precipitation. There are often changes in the siting of instrumentation for any given National Weather Service station over the observational history in a given area. In consultation with NOAA's National Centers for Environmental Information (NCEI) and the National Weather Service (NWS), the Northeast Regional Climate Center (NRCC) has evaluated station relocations and built "threads" for several locations that are published in NCEI's Local Climatological Data using NOAA daily data sets. Many data sets are included in these threads, including data contributed by local NWS offices, state climate offices and regional climate centers. In addition, an ongoing process of adding daily data from the old NWS Climate Record Books continues.

Before ThreadEx, NWS Jackson undertook a similar project, creating combined climate records at Jackson, Meridian, Hattiesburg, Greenville, Greenwood, and Tallulah. When the first phase of ThreadEx debuted in 2006, Jackson and Meridian were among the sites included in ThreadEx. A second phase was just completed, which added Greenville as a third ThreadEx site in our area. The ThreadEx data is now used in NWS Jackson climate products for Jackson, Meridian, and Greenville, while we continue to use the locally threaded records for the remaining three sites. It is possible additional ThreadEx expansion will happen in the future, and we hope to add the remaining three sites.

The updated Greenville climate data can be viewed in the NOWData section of our website by using the "Greenville area" location.

Our local daily climate reports for Greenville are also incorporating the expanded records as of May 9th.

Greenville area site history

  • Greenville COOP (1/1/1903 - 8/12/2001)
  • Greenville Airport ASOS (8/13/2001 - present)