The Seasonally Adjusted CPI Was up 0.171% in January

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

June 0.2870%

July 0.1966%

Aug 0.3825%

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

Nov. 0.2044%

Dec. 0.307% 

 

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 326.031 in Dec. and 326.588 in Jan. Since 326.588/326.031 = 1.00171, that means it was up 0.171%. If we had that every month for 12 months it would be up 2.07%.

It was 318.961 in Jan. 2025. Since 326.588/318.961 = 1.0239, that means it was up 2.39% over the last 12 months.

The non-seasonally adjusted CPI was 324.054 in Jan. and 317.671 in Jan. 2025. That was up 2.39%. 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 Nov. 2025 than Nov. 2024).

For more information see  Consumer prices rose 2.4% annually in January, less than expected by Jeff Cox of CNBC. Excerpt: 

"The cost of goods and services rose at a slower annual rate than expected in January, providing hope that the nagging U.S. inflation problem could be starting to ease.

The consumer price index for January accelerated 2.4% from the same time a year ago, down 0.3 percentage point from the prior month, the Bureau of Labor Statistics reported Friday. That pulled the inflation rate down to where it was the month after President Donald Trump in April 2025 announced aggressive tariffs on U.S. imports.

Excluding food and energy, the core CPI was up 2.5%, the lowest level since April 2021. Economists surveyed by Dow Jones had been looking for an annual rate of 2.5% for both readings."

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. 

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: