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Consumer Price Index
Updated seasonal factors to be introduced February 8, 2022
  • 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 2017 through December 2021 will be made available on Tuesday, February 8, 2022. The revised indexes and seasonal factors will be available 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.


  • Revised seasonally adjusted indexes and factors, 2016-2020 (XLSX)
  • Seasonal factors table, 2021 (XLSX)
  • Series changing seasonal status, 2016-2020 (HTML)
  • Components of seasonally adjusted all items, 2021 (HTML)
  • Intervention analysis in seasonal adjustment, 2021 (HTML)
  • COVID-19 intervention analysis in seasonal adjustment (XLSX)
  • Specification files, 2016-2020 (ZIP)
  • Used cars and trucks data (XLSX)
  • Archived seasonal adjustment data


Last Modified Date: December 21, 2021