Observations

Sep 2027: 104.84

Updated: Mar 17, 2026 9:30 AM CDT

Units:

Seasonal Factor,

Not Seasonally Adjusted

Frequency:

Monthly

Notes

Title	Release Dates

Weekday-Basis Seasonal Factors: Auto Production	2019-03-15	2026-03-16

Source

Board of Governors of the Federal Reserve System (US)	2019-03-15	2026-03-16

Release

Seasonal Factors for Domestic Auto and Truck Production	2019-03-15	2026-03-16

Units

Seasonal Factor	2019-03-15	2026-03-16

Frequency

Monthly	2019-03-15	2026-03-16

Seasonal Adjustment

Not Seasonally Adjusted	2019-03-15	2026-03-16

Notes

A seasonal factor measures the percentage amount that on average, monthly production is above or below normal. A seasonal factor of 120 states that the month in question will usually be 20% above an average month's production level. Similarly, a seasonal factor of 100 implies an average month, while a factor of 80 implies a month that is typically 20% below average. The not seasonally adjusted (NSA) data for auto assemblies (https://fred.stlouisfed.org/series/MVAAUTOASN) are obtained from Ward's Communications, the weekly-basis seasonal factors (SFW), which contain adjustments for holiday and length-of-month effects as well as normal seasonal variation, and the number of production days, or weekdays in a month (https://fred.stlouisfed.org/series/G17MVSFWWKDAYS), are applied to MVAAUTOASN (https://fred.stlouisfed.org/series/MVAAUTOASN) using the formula found here (https://www.federalreserve.gov/releases/g17/mvsf.htm).	2019-03-15	2026-03-16

Release Tables

Seasonal Factors for Domestic Auto and Truck Production