CNN Money details:
Inflation overall held steady last month, as declining gas prices balanced out higher prices for other items.
The government's key measure of inflation, the Consumer Price Index, showed prices were virtually unchanged from November to December. It marked the second month in a row CPI has barely moved.
In the past 12 months, prices rose 3%, a slowdown from a 3.4% annual inflation rate in November. The numbers are seasonally adjusted.