The Seasonally Adjusted CPI Was 0.307% Higher In December Than November. 12 month was up 2.65%

Here are the changes in the seasonally adjusted CPI for the six months ending in Nov: 

May  0.0810%

June 0.2870%

July 0.1966%

Aug 0.3825%

Sept. 0.3105% (There was no report for October due to the government shutdown)

Nov. .2044% 

 

The last decline was March 2025 when it was -0.0500%. Before that it was June 2024 when it was -0.0029%.

 

See Consumer Price Index for All Urban Consumers: All Items in U.S. City Average from FRED (Federal Reserve Economic Data) compiled by the Research Division at the Federal Reserve Bank of St. Louis for data on the seasonally adjusted CPI.

 

That site shows a graph but if you click on the Download button you will get the actual numbers in Microsoft Excel.

The Consumer Price Index for All Urban Consumers: All Items in U.S. City Average (CPIAUCSL) was 325.031 in Nov. and 326.030 in Dec. Since 326.030/325.031 = 1.00307, that means it was up 0.307% over the two months. If we went up that much every month for 12 months it would be up 3.75%.

It was 317.603 in Dec. 2024. Since 326.030/317.603 = 1.0265, that means it was up 2.65% over the last12 months.

The non-seasonally adjusted CPI was 324.054 in Dec. and 315.605 in Dec. 2024. That was up 2.68%. So pretty close to the seasonally adjusted CPI. This is still above the Fed's target of 2.0% (although they prefer to use the Personal Consumption Expenditures Price Index which was 2.8% higher in Sept. 2025 than Sept. 2024). See BEA says it will use US September, November CPI averages to calculate October PCE inflation. It said "The delayed PCE inflation data for October and November will be published on January ‍22."

For more information see Here’s the inflation breakdown for December 2025 — in one chart by Greg Iacurci of CNBC. Excerpt:

"Progress in the fight to throttle back inflation appeared to stall in December amid price pressures from groceries, dining out, utility gas, clothing and other categories of consumer spending.

The consumer price index, a key inflation gauge, rose 2.7% in December from 12 months earlier, the Bureau of Labor Statistics said Tuesday. That was unchanged from the previous month and in line with estimates.

“The bottom line is, I think inflation is still uncomfortably high,” said Mark Zandi, chief economist at Moody’s. “Inflation for staples, necessities, remains elevated.”"

The article also discusses what types of products are going up in price and what is going down. There is a graph of the monthly year-over-year percent change in prices and core prices going back almost 4 years. 

Other related links:

 

Consumer Price Index for All Urban Consumers: All Items Less Food and Energy in U.S. City Average (CPILFESL) This is also from from FRED (Federal Reserve Economic Data), compiled by the Research Division at the Federal Reserve Bank of St. Louis. It has the seasonally adjusted core CPI.

 

Consumer Price Index Data from 1913 to 2025

 

Personal Consumption Expenditures Price Index 

 

The Bureau of Labor Statistics makes seasonal adjustments. See Consumer Price Index Summary.

 

The table below has the annual inflation rate since 1914 in the columns labeled CPI %Ch. or CPI percentage change. It is from Consumer Price Index Data from 1913 to 2025 and is not seasonally adjusted. It is also the December to December change in the CPI. That site also looks at how the 12 month average for the CPI changed from one year to the next.

 

Year	CPI %Ch.		Year	CPI %Ch.		Year	CPI %Ch.		Year	CPI %Ch.
1914	1		1944	2.3		1974	12.3		2004	3.3
1915	2		1945	2.2		1975	6.9		2005	3.4
1916	12.6		1946	18.1		1976	4.9		2006	2.5
1917	18.1		1947	8.8		1977	6.7		2007	4.1
1918	20.4		1948	3		1978	9		2008	0.1
1919	14.5		1949	-2.1		1979	13.3		2009	2.7
1920	2.6		1950	5.9		1980	12.5		2010	1.5
1921	-10.8		1951	6		1981	8.9		2011	3
1922	-2.3		1952	0.8		1982	3.8		2012	1.7
1923	2.4		1953	0.7		1983	3.8		2013	1.5
1924	0		1954	-0.7		1984	3.9		2014	0.8
1925	3.5		1955	0.4		1985	3.8		2015	0.7
1926	-1.1		1956	3		1986	1.1		2016	2.1
1927	-2.3		1957	2.9		1987	4.4		2017	2.1
1928	-1.2		1958	1.8		1988	4.4		2018	1.9
1929	0.6		1959	1.7		1989	4.6		2019	2.3
1930	-6.4		1960	1.4		1990	6.1		2020	1.4
1931	-9.3		1961	0.7		1991	3.1		2021	7
1932	-10.3		1962	1.3		1992	2.9		2022	6.5
1933	0.8		1963	1.6		1993	2.7		2023	3.4
1934	1.5		1964	1		1994	2.7		2024	2.9
1935	3		1965	1.9		1995	2.5		2025	2.7
1936	1.4		1966	3.5		1996	3.3
1937	2.9		1967	3		1997	1.7
1938	-2.8		1968	4.7		1998	1.6
1939	0		1969	6.2		1999	2.7
1940	0.7		1970	5.6		2000	3.4
1941	9.9		1971	3.3		2001	1.6
1942	9		1972	3.4		2002	2.4
1943	3		1973	8.7		2003	1.9

 

Here is a timeline graph of this data: