U.S. flag

An official website of the United States government

Department of Labor Logo United States Department of Labor
Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Consumer Price Index
Bureau of Labor Statistics > Consumer Price Index > Methods > Seasonal Adjustment
Updated seasonal factors introduced February 10, 2023

  • 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 2018 through December 2022 were made available on Friday, February 10, 2023. The revised indexes and seasonal factors will be available on this page. CPI can be contacted after 8:30am EST on the day of release to obtain updated seasonal factors.

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.

Data

  • Revised seasonally adjusted indexes and factors, 2018-2022 (XLSX)
  • Seasonal factors table, 2023 (XLSX)
  • Series changing seasonal status, 2018-2022 (HTML)
  • Components of seasonally adjusted all items, 2023 (HTML)
  • Intervention analysis in seasonal adjustment, 2023 (HTML)
  • Specification files, 2018-2022 (ZIP)
  • New vehicles data (XLSX)
  • Archived seasonal adjustment data

 

Last Modified Date: March 10, 2023