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Consumer Price Index
Bureau of Labor Statistics > Consumer Price Index > About > Notices

Consumer Price Index End of Year Supplemental Files and Revised Seasonal Adjustment Factors to be Available on February 12, 2025

Each year with the release of CPI data for January, relative importance weights are updated and seasonal adjustment factors are recalculated to reflect price movements from the just-completed calendar year. This routine annual recalculation may result in revisions to seasonally adjusted indexes for the previous 5 years.

Revised seasonal adjustment factors and additional end of year files will be released on February 12, 2025, at 8:30 AM eastern time, in conjunction with the release of CPI data for January 2025. The following files will be available on the CPI supplemental files page:

  • Consumer Price Index Seasonal Adjustment Factors (XLSX)
  • Consumer Price Index Relative Importance (XLSX)
  • Consumer Price Index Revised Seasonally Adjusted Indexes and Factors (XLSX)
  • CPI-U Median Price Change and Median Price Change Standard Errors (XLSX)
  • CPI-U Response Rates (XLSX)
  • Consumer Price Index Components for Seasonal Aggregation to All items (XLSX)
  • Consumer Price Index Series Subject to Intervention Analysis Seasonal Adjustment (XLSX)
  • CPI-U Historical Cost Weights (XLSX)
  • CPI-W Historical Cost Weights (XLSX)

With the release of these files, the seasonal factors and selected end of year materials will be available in the API and FTP files. These files will be available for all U.S. city average CPI-U data and a subset of U.S. city average CPI-W data.

In preparation for the upcoming end of year supplemental files and revised seasonal adjustment factors, last year’s end of year supplemental files and revised seasonal adjustment factors are now available on the CPI supplemental files page.

BLS also posted last year’s seasonal factors and other end of year materials in the API and FTP files on November 22, 2024.