FRB: G.17 Release-- Industrial Production and Capacity Utilization

Federal Reserve Seasonal Factors for Domestic Auto and Truck Production

Seasonal factors for auto and truck production were revised in June 2009 and extended through December 2009. These factors are based on production data through April 2009 and were revised back to January 2009. Seasonal factors will next revise in mid October 2009, after production data for the third quarter are available.

Monthly figures for motor vehicle assemblies in millions of units at an annual rate are published in Table 3 of the G.17 release. The formula for seasonally adjusted annual rates (SAAR) of auto and truck production (in millions of units) for each month is

    

       SAAR = ((NSA data in units/1,000,000) * 12)/(SF * .01).

The not seasonally adjusted (NSA) data are obtained from Ward’s Communications, and the seasonal factors (SF), which contain adjustments for holiday and length-of-month effects as well as normal seasonal variation, are shown in the table below under "Regular Seasonal Factors."

The table below also shows a set of seasonal factors on a weekday average basis in the columns under "Weekday-basis Seasonal Factors"; the number of production days in a month, or weekdays, is shown separately. Using this information, the formula for seasonally adjusted annual rates of auto and truck production (in millions of units) for each month is

    

       SAAR = ((NSA data in units/1,000,000) * 260)/(weekdays * SFW * .01).

Multiplying by 260, the average number of weekdays in a year, converts the weekday average production to an annual production rate. This formula reduces to

    

       SAAR = (NSA data in units * .026) / (weekdays * SFW).

A comma-delimited text file containing these seasonal factors is available for download here.

Monthly Seasonal Factors for Domestic Auto and Truck Production
	Regular Seasonal Factors			Weekday-basis Seasonal Factors
	Autos	Total Trucks	Light Trucks	Autos	Total Trucks	Light Trucks	Weekdays
	Autos	Total Trucks	Light Trucks	Autos	Total Trucks	Light Trucks	Weekdays
Jan-1998	89.68	89.71	89.99	88.32	88.35	88.63	22
Feb-1998	99.57	101.25	101.53	107.87	109.69	109.99	20
Mar-1998	113.55	114.34	114.62	111.83	112.61	112.88	22
Apr-1998	105.41	106.46	106.32	103.81	104.84	104.71	22
May-1998	105.15	105.39	105.56	108.48	108.73	108.92	21
Jun-1998	102.70	101.53	101.32	101.15	99.99	99.79	22
Jul-1998	74.24	67.78	66.23	69.94	63.86	62.39	23
Aug-1998	99.62	95.41	95.11	102.78	98.44	98.13	21
Sep-1998	104.04	110.29	110.77	102.46	108.61	109.09	22
Oct-1998	112.53	113.29	113.41	110.82	111.57	111.69	22
Nov-1998	93.96	93.48	93.77	96.94	96.44	96.75	21
Dec-1998	88.57	89.47	89.50	83.44	84.28	84.31	23
Jan-1999	89.82	89.60	89.95	92.67	92.44	92.80	21
Feb-1999	99.37	101.16	101.44	107.65	109.59	109.90	20
Mar-1999	118.59	119.54	119.83	111.71	112.61	112.89	23
Apr-1999	105.14	106.22	106.09	103.55	104.61	104.48	22
May-1999	104.81	105.12	105.25	108.14	108.45	108.59	21
Jun-1999	112.87	108.01	107.50	111.16	106.38	105.87	22
Jul-1999	63.77	61.58	60.30	62.80	60.64	59.38	22
Aug-1999	105.84	104.65	104.59	104.23	103.06	103.00	22
Sep-1999	105.11	107.02	107.29	103.51	105.40	105.67	22
Oct-1999	106.87	107.73	107.87	110.26	111.15	111.29	21
Nov-1999	99.80	99.20	99.53	98.29	97.70	98.03	22
Dec-1999	87.96	89.44	89.50	82.86	84.25	84.31	23
Jan-2000	94.47	93.95	94.16	97.47	96.94	97.15	21
Feb-2000	104.57	106.14	106.45	107.89	109.51	109.83	21
Mar-2000	118.36	119.75	120.08	111.50	112.81	113.12	23
Apr-2000	94.42	95.05	94.97	102.29	102.97	102.89	20
May-2000	109.45	110.32	110.48	103.10	103.92	104.07	23
Jun-2000	112.27	110.76	110.49	110.57	109.08	108.81	22
Jul-2000	62.32	60.76	59.63	64.30	62.69	61.52	21
Aug-2000	111.31	109.52	109.58	104.86	103.17	103.23	23
Sep-2000	100.80	98.58	98.61	104.00	101.71	101.74	21
Oct-2000	111.51	113.10	113.20	109.82	111.39	111.49	22
Nov-2000	99.61	99.19	99.45	98.10	97.69	97.95	22
Dec-2000	82.13	84.11	84.20	84.73	86.78	86.88	21
Jan-2001	99.46	98.17	98.33	93.70	92.48	92.63	23
Feb-2001	99.57	100.88	101.16	107.87	109.28	109.59	20
Mar-2001	112.85	114.55	114.89	111.14	112.81	113.15	22
Apr-2001	99.60	100.03	99.95	102.76	103.20	103.12	21
May-2001	114.21	115.67	115.82	107.59	108.97	109.11	23
Jun-2001	106.79	105.54	105.31	110.18	108.90	108.65	21
Jul-2001	62.88	60.97	59.56	61.93	60.04	58.66	22
Aug-2001	113.03	110.85	110.99	106.48	104.42	104.56	23
Sep-2001	98.31	96.16	96.34	106.51	104.17	104.37	20
Oct-2001	116.33	118.26	118.36	109.58	111.40	111.50	23
Nov-2001	99.53	99.36	99.62	98.02	97.85	98.11	22
Dec-2001	76.69	78.70	78.81	79.12	81.19	81.31	21
Jan-2002	99.81	97.56	97.64	94.02	91.91	91.98	23
Feb-2002	99.53	100.70	100.97	107.83	109.09	109.39	20
Mar-2002	102.21	104.13	104.45	105.46	107.43	107.77	21
Apr-2002	109.82	110.25	110.15	108.16	108.58	108.48	22
May-2002	113.53	115.53	115.66	106.94	108.83	108.95	23
Jun-2002	101.64	100.63	100.45	110.11	109.01	108.82	20
Jul-2002	70.81	65.80	64.41	66.70	61.99	60.67	23
Aug-2002	103.94	103.49	103.62	102.37	101.92	102.05	22
Sep-2002	101.98	100.99	101.15	105.22	104.20	104.36	21
Oct-2002	116.31	117.86	117.94	109.56	111.03	111.10	23
Nov-2002	89.19	88.99	89.24	92.03	91.82	92.08	21
Dec-2002	76.49	78.61	78.72	75.33	77.42	77.53	22
Jan-2003	100.06	96.87	96.86	94.26	91.26	91.25	23
Feb-2003	99.44	100.51	100.78	107.73	108.89	109.18	20
Mar-2003	107.09	109.20	109.53	110.49	112.66	113.01	21
Apr-2003	104.08	105.01	104.91	102.50	103.41	103.32	22
May-2003	107.52	110.05	110.14	105.89	108.39	108.47	22
Jun-2003	102.98	102.51	102.41	106.25	105.76	105.66	21
Jul-2003	74.32	67.80	66.52	70.01	63.87	62.66	23
Aug-2003	103.32	101.42	101.60	106.60	104.64	104.83	21
Sep-2003	103.76	105.00	105.08	102.18	103.41	103.48	22
Oct-2003	116.51	117.07	117.12	109.75	110.29	110.33	23
Nov-2003	90.65	90.68	90.95	98.20	98.23	98.53	20
Dec-2003	86.46	89.30	89.42	81.44	84.13	84.23	23
Jan-2004	92.05	88.38	88.30	90.65	87.04	86.96	22
Feb-2004	99.62	100.36	100.62	107.92	108.73	109.00	20
Mar-2004	117.35	119.57	119.93	110.54	112.64	112.98	23
Apr-2004	104.82	106.51	106.42	103.24	104.90	104.80	22
May-2004	99.67	102.72	102.78	102.84	105.98	106.04	21
Jun-2004	111.54	111.65	111.63	109.85	109.95	109.94	22
Jul-2004	69.87	64.35	63.09	68.81	63.37	62.14	22
Aug-2004	107.28	104.55	104.65	105.65	102.97	103.07	22
Sep-2004	107.48	108.04	108.29	105.85	106.40	106.65	22
Oct-2004	106.58	106.21	106.22	109.96	109.58	109.59	21
Nov-2004	97.46	97.65	97.98	95.99	96.17	96.50	22
Dec-2004	86.18	89.43	89.53	81.18	84.25	84.34	23
Jan-2005	96.93	92.35	92.19	100.01	95.29	95.12	21
Feb-2005	100.02	100.25	100.49	108.35	108.61	108.86	20
Mar-2005	108.82	110.71	111.03	102.51	104.29	104.59	23
Apr-2005	107.50	110.12	110.01	110.92	113.61	113.50	21
May-2005	103.54	107.58	107.61	101.97	105.95	105.98	22
Jun-2005	111.21	112.35	112.45	109.52	110.65	110.75	22
Jul-2005	65.54	60.81	59.60	67.62	62.75	61.49	21
Aug-2005	115.20	111.51	111.79	108.52	105.04	105.31	23
Sep-2005	106.98	106.50	106.68	105.36	104.89	105.07	22
Oct-2005	107.11	105.87	105.84	110.51	109.23	109.20	21
Nov-2005	93.61	94.05	94.39	92.19	92.62	92.96	22
Dec-2005	85.75	89.39	89.47	84.45	88.04	88.12	22
Jan-2006	96.97	91.70	91.47	95.50	90.31	90.08	22
Feb-2006	100.24	100.28	100.50	108.59	108.63	108.88	20
Mar-2006	117.62	119.49	119.84	110.80	112.57	112.89	23
Apr-2006	93.14	95.90	95.78	100.90	103.89	103.76	20
May-2006	109.20	114.32	114.34	102.87	107.70	107.71	23
Jun-2006	110.93	112.97	113.18	109.25	111.26	111.46	22
Jul-2006	67.30	60.79	59.61	69.43	62.72	61.50	21
Aug-2006	114.90	112.74	113.14	108.23	106.21	106.58	23
Sep-2006	102.12	101.15	101.25	105.36	104.36	104.47	21
Oct-2006	112.79	110.78	110.73	111.08	109.10	109.05	22
Nov-2006	97.00	97.63	97.99	95.53	96.15	96.50	22
Dec-2006	80.47	84.11	84.18	83.02	86.78	86.85	21
Jan-2007	101.77	95.59	95.26	95.87	90.05	89.74	23
Feb-2007	100.39	100.35	100.57	108.76	108.71	108.95	20
Mar-2007	112.58	114.25	114.58	110.87	112.52	112.85	22
Apr-2007	97.78	101.09	100.94	100.89	104.30	104.15	21
May-2007	108.35	114.30	114.30	102.07	107.67	107.67	23
Jun-2007	105.57	108.41	108.71	108.93	111.85	112.16	21
Jul-2007	73.71	66.20	65.07	72.59	65.20	64.09	22
Aug-2007	113.19	111.25	111.59	106.63	104.80	105.12	23
Sep-2007	97.49	95.75	95.83	105.62	103.73	103.82	20
Oct-2007	118.55	115.88	115.82	111.68	109.16	109.11	23
Nov-2007	100.58	101.64	102.00	99.05	100.10	100.45	22
Dec-2007	75.28	78.90	78.95	77.67	81.41	81.45	21
Jan-2008	102.18	95.19	94.79	96.25	89.67	89.29	23
Feb-2008	105.34	105.28	105.51	108.69	108.63	108.86	21
Mar-2008	99.29	100.58	100.88	102.44	103.77	104.08	21
Apr-2008	110.88	115.26	115.07	109.20	113.51	113.33	22
May-2008	101.39	107.70	107.68	99.85	106.07	106.05	22
Jun-2008	105.50	108.99	109.38	108.84	112.45	112.85	21
Jul-2008	75.16	69.45	68.30	70.80	65.43	64.34	23
Aug-2008	105.16	100.26	100.54	108.49	103.44	103.73	21
Sep-2008	108.28	106.39	106.53	106.64	104.78	104.91	22
Oct-2008	119.15	115.69	115.61	112.24	108.98	108.91	23
Nov-2008	86.69	87.96	88.28	93.91	95.29	95.64	20
Dec-2008	85.22	89.59	89.62	80.28	84.40	84.43	23
Jan-2009	93.54	85.55	85.01	92.12	84.25	83.72	22
Feb-2009	97.66	99.99	100.14	105.80	108.32	108.48	20
Mar-2009	107.65	113.10	113.60	106.02	111.38	111.88	22
Apr-2009	99.47	109.11	109.10	97.97	107.46	107.45	22
May-2009	94.09	102.87	103.01	97.08	106.13	106.28	21
Jun-2009	109.30	114.67	115.24	107.65	112.93	113.50	22
Jul-2009	78.11	75.31	74.49	73.58	70.94	70.17	23
Aug-2009	105.15	97.77	97.86	108.48	100.87	100.97	21
Sep-2009	108.96	103.10	103.04	107.31	101.54	101.48	22
Oct-2009	117.74	110.16	109.99	115.96	108.50	108.33	22
Nov-2009	98.65	96.80	97.07	101.78	99.87	100.16	21
Dec-2009	88.76	89.84	89.71	83.61	84.63	84.51	23

June 5, 2009
Industrial Output Section
Division of Research and Statistics
Board of Governors of the Federal Reserve System
Washington D.C. 20551

Statistical releases