Source: BLS, CPI for All Urban Consumers (CPI-U): U.S. city average, Seasonally adjusted changes from preceding month, All items less food and energy.

For example, "The index for all items less food and energy rose 0.4 percent in February, as it did in January."

Resolves based on the initial release (i.e. subsequent revisions don't affect resolution). Resolves to the reported number rounded to the nearest tenth of a percent.

Reported on Dec 11 (question closes just before release).

FRED has historical data for perspective.

I may add additional options up until the final month, if it seems warranted based on expectations.