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Consumer Price Index
Bureau of Labor Statistics > Consumer Price Index > Methods > Seasonal Adjustment
Updated seasonal factors to be introduced February 12, 2025

Each year with the release of the January CPI, 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. Recalculated seasonally adjusted indexes as well as recalculated seasonal adjustment factors for the period January 2020 through December 2024 will be made available on Wednesday, February 12, 2025. The revised indexes and seasonal factors will be available on the CPI supplemental files page and on this page.

The Consumer Price Index (CPI) produces both unadjusted and seasonally adjusted data. Seasonally adjusted data are computed using seasonal factors derived by the X-13ARIMA-SEATS Seasonal Adjustment Method. These factors are updated with the release of January data in February and reflect price movements from the previous calendar year. The new factors are used to revise the previous 5 years of seasonally adjusted data; older seasonally adjusted indexes are considered to be final. Recalculated seasonally adjusted indexes as well as recalculated seasonal adjustment factors for the period January 2019 through December 2023 were made available on Friday, February 9, 2024.

Data

  • Revised seasonally adjusted indexes and factors, last five years (XLSX)
  • Seasonal factors table, current (XLSX)
  • Series changing seasonal status, last five years (HTML)
  • Components of seasonally adjusted all items, current (XLSX)
  • Intervention analysis in seasonal adjustment, current (XLSX)
  • Specification files, 2018-2022 (ZIP)
  • New vehicles data (XLSX)
  • Used cars and trucks data, 2024 (XLSX)
  • Archived seasonal adjustment data

 

Last Modified Date: November 14, 2024