The Seasonally Adjusted CPI Was up 0.47% in May

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

Nov. 0.2523% (change from Sept-There was no report for October due to the government shutdown)

Dec. 0.2978%

Jan. 0.1708%

Feb. 0.2670

March 0.865%

April 0.640%

 

The last decline was June 2024 when it was -0.042%.

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 333.979 in May and 332.407 in April. Since 333.979/332.407 = 1.0047, that means it was up 0.47%. If we had that every month for 12 months it would be up 5.82%. 

It was 320.620 in May 2025. Since 333.979/320.620 = 1.0417, that means it was up 4.17% over the last 12 months.

The non-seasonally adjusted CPI was 335.123 in May and 321.465 in May 2025. That was up 4.25%. So pretty close to the seasonally adjusted CPI. This is well above the Fed's target of 2.0% (although they prefer to use the Personal Consumption Expenditures Price Index which was 3.8% higher in April 2026 than April 2025).

For more information see Consumer prices rose 4.2% annually in May, highest in three years by Jeff Cox of CNBC. Excerpt:

"Inflation accelerated in May as rising energy costs contributed to pain for consumers, though underlying pressures were less intense.

The consumer price index, a broad gauge of goods and services costs across the U.S. economy, rose at a seasonally adjusted 0.5% for the month, putting the annual inflation rate at 4.2%, the Bureau of Labor Statistics reported Wednesday. Both numbers were in line with the Dow Jones consensus though the monthly number was 0.1 percentage point below the April reading.

Inflation climbed above 4% for the first time in three years, though the increase met expectations amid concerns over how much the surge in energy prices would impact the economy. The level was the highest since April 2023 and above the 3.8% reading from April.

However, stripping out volatile food and energy prices, the so-called core CPI accelerated 0.2% for the month and 2.9% from a year ago. While the annual rate was in line with the forecast, the monthly gain was below the 0.3% estimate and less than the 0.4% April increase."

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."   

Related material: 

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 2026 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: