Industrial Production and Capacity Utilization - G.17

Federal Reserve Seasonal Factors for Domestic Auto and Truck Production

Seasonal factors for auto and truck production were revised in March 2013 for the annual revision to the index of industrial production. The seasonal factors were revised back to January 2000. The seasonal factors will next be revised in mid June 2013, when manufacturers issue their initial assembly plans for the third quarter.

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
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	94.51	93.99	94.20	97.51	96.97	97.19	21
Feb-2000	104.59	106.01	106.32	107.92	109.38	109.70	21
Mar-2000	118.42	119.48	119.81	111.56	112.55	112.87	23
Apr-2000	94.44	94.87	94.79	102.31	102.78	102.68	20
May-2000	109.59	110.03	110.17	103.23	103.65	103.79	23
Jun-2000	112.23	110.67	110.38	110.53	108.99	108.71	22
Jul-2000	62.20	60.89	59.77	64.17	62.82	61.67	21
Aug-2000	111.10	109.75	109.81	104.66	103.39	103.45	23
Sep-2000	100.68	98.80	98.83	103.87	101.93	101.97	21
Oct-2000	111.53	113.30	113.41	109.84	111.58	111.69	22
Nov-2000	99.73	99.39	99.67	98.22	97.89	98.16	22
Dec-2000	82.21	84.09	84.17	84.82	86.76	86.84	21
Jan-2001	99.55	98.32	98.48	93.78	92.62	92.77	23
Feb-2001	99.64	100.82	101.11	107.94	109.22	109.53	20
Mar-2001	112.94	114.23	114.57	111.22	112.50	112.83	22
Apr-2001	99.57	99.74	99.65	102.74	102.91	102.81	21
May-2001	114.24	115.23	115.36	107.62	108.55	108.68	23
Jun-2001	106.64	105.34	105.09	110.02	108.69	108.43	21
Jul-2001	62.73	61.13	59.75	61.78	60.20	58.84	22
Aug-2001	112.77	111.08	111.23	106.23	104.64	104.78	23
Sep-2001	98.16	96.38	96.58	106.35	104.41	104.63	20
Oct-2001	116.41	118.52	118.64	109.66	111.65	111.76	23
Nov-2001	99.73	99.66	99.94	98.22	98.15	98.43	22
Dec-2001	76.84	78.70	78.78	79.28	81.20	81.28	21
Jan-2002	100.01	97.87	97.95	94.21	92.20	92.27	23
Feb-2002	99.66	100.69	100.97	107.97	109.09	109.38	20
Mar-2002	102.31	103.77	104.08	105.56	107.06	107.38	21
Apr-2002	109.73	109.79	109.68	108.07	108.13	108.02	22
May-2002	113.42	114.92	115.05	106.84	108.26	108.38	23
Jun-2002	101.36	100.34	100.16	109.81	108.71	108.50	20
Jul-2002	70.59	66.02	64.66	66.50	62.20	60.91	23
Aug-2002	103.64	103.71	103.85	102.07	102.13	102.28	22
Sep-2002	101.78	101.25	101.42	105.01	104.46	104.64	21
Oct-2002	116.43	118.18	118.27	109.68	111.33	111.41	23
Nov-2002	89.45	89.34	89.60	92.29	92.17	92.45	21
Dec-2002	76.74	78.64	78.70	75.58	77.45	77.51	22
Jan-2003	100.41	97.36	97.37	94.59	91.72	91.72	23
Feb-2003	99.66	100.62	100.89	107.97	109.00	109.30	20
Mar-2003	107.24	108.80	109.11	110.65	112.26	112.57	21
Apr-2003	103.94	104.32	104.20	102.36	102.74	102.63	22
May-2003	107.32	109.29	109.39	105.69	107.63	107.74	22
Jun-2003	102.51	102.05	101.94	105.77	105.29	105.18	21
Jul-2003	74.02	68.12	66.88	69.73	64.17	63.01	23
Aug-2003	102.86	101.62	101.82	106.13	104.85	105.05	21
Sep-2003	103.40	105.33	105.43	101.84	103.73	103.84	22
Oct-2003	116.60	117.45	117.51	109.84	110.64	110.70	23
Nov-2003	91.07	91.04	91.32	98.66	98.62	98.93	20
Dec-2003	87.02	89.36	89.39	81.98	84.18	84.20	23
Jan-2004	92.55	89.11	89.04	91.15	87.76	87.69	22
Feb-2004	99.95	100.74	100.99	108.28	109.13	109.40	20
Mar-2004	117.50	119.20	119.52	110.69	112.29	112.59	23
Apr-2004	104.60	105.38	105.28	103.01	103.79	103.69	22
May-2004	99.46	101.72	101.84	102.62	104.95	105.08	21
Jun-2004	110.62	110.79	110.73	108.94	109.12	109.05	22
Jul-2004	69.51	64.83	63.62	68.46	63.85	62.66	22
Aug-2004	106.62	104.82	104.96	105.00	103.23	103.37	22
Sep-2004	106.99	108.58	108.89	105.37	106.94	107.24	22
Oct-2004	106.71	106.46	106.46	110.10	109.83	109.84	21
Nov-2004	98.02	98.09	98.44	96.53	96.60	96.95	22
Dec-2004	87.16	89.43	89.38	82.11	84.24	84.20	23
Jan-2005	97.67	93.66	93.51	100.77	96.63	96.48	21
Feb-2005	100.45	100.91	101.12	108.82	109.32	109.55	20
Mar-2005	108.82	110.49	110.76	102.51	104.08	104.34	23
Apr-2005	107.03	108.19	108.10	110.43	111.62	111.54	21
May-2005	103.53	106.26	106.40	101.97	104.65	104.79	22
Jun-2005	109.77	110.97	110.98	108.11	109.29	109.30	22
Jul-2005	65.18	61.60	60.43	67.25	63.56	62.34	21
Aug-2005	114.27	111.92	112.27	107.64	105.44	105.77	23
Sep-2005	106.35	107.31	107.59	104.74	105.68	105.96	22
Oct-2005	107.32	106.13	106.09	110.73	109.50	109.46	21
Nov-2005	94.38	94.34	94.69	92.95	92.91	93.26	22
Dec-2005	87.01	89.15	89.02	85.69	87.80	87.67	22
Jan-2006	97.87	93.73	93.52	96.39	92.31	92.10	22
Feb-2006	100.79	101.28	101.46	109.19	109.72	109.91	20
Mar-2006	117.59	119.63	119.92	110.77	112.69	112.97	23
Apr-2006	92.50	93.52	93.46	100.20	101.31	101.25	20
May-2006	109.39	112.37	112.55	103.05	105.86	106.03	23
Jun-2006	108.84	110.81	110.87	107.19	109.13	109.19	22
Jul-2006	66.93	62.05	60.93	69.05	64.02	62.86	21
Aug-2006	113.85	113.46	113.96	107.25	106.88	107.35	23
Sep-2006	101.39	102.23	102.47	104.61	105.48	105.72	21
Oct-2006	113.37	111.19	111.09	111.65	109.51	109.40	22
Nov-2006	97.86	97.60	97.94	96.37	96.12	96.46	22
Dec-2006	81.76	83.56	83.36	84.35	86.22	86.01	21
Jan-2007	102.95	98.68	98.43	96.98	92.96	92.72	23
Feb-2007	101.11	101.65	101.82	109.53	110.12	110.30	20
Mar-2007	112.42	114.67	114.94	110.72	112.93	113.19	22
Apr-2007	96.91	97.91	97.86	99.99	101.02	100.97	21
May-2007	108.71	111.72	111.90	102.41	105.24	105.42	23
Jun-2007	103.03	105.66	105.78	106.31	109.02	109.14	21
Jul-2007	73.34	68.11	67.09	72.23	67.07	66.07	22
Aug-2007	111.94	112.20	112.69	105.45	105.70	106.16	23
Sep-2007	96.52	96.98	97.21	104.56	105.06	105.31	20
Oct-2007	119.60	116.70	116.57	112.66	109.93	109.81	23
Nov-2007	101.72	101.06	101.34	100.18	99.53	99.81	22
Dec-2007	76.51	78.03	77.77	78.94	80.51	80.24	21
Jan-2008	103.65	99.34	99.08	97.64	93.58	93.33	23
Feb-2008	106.23	107.10	107.29	109.60	110.50	110.70	21
Mar-2008	99.06	101.27	101.50	102.20	104.49	104.72	21
Apr-2008	109.83	111.04	110.98	108.16	109.36	109.29	22
May-2008	101.86	104.47	104.62	100.31	102.88	103.04	22
Jun-2008	102.44	105.45	105.60	105.69	108.80	108.95	21
Jul-2008	74.83	72.06	71.08	70.49	67.88	66.96	23
Aug-2008	103.74	101.34	101.81	107.03	104.56	105.04	21
Sep-2008	106.85	107.97	108.31	105.23	106.33	106.67	22
Oct-2008	120.73	116.85	116.68	113.73	110.08	109.91	23
Nov-2008	87.74	87.04	87.25	95.06	94.29	94.52	20
Dec-2008	86.78	88.24	87.87	81.75	83.13	82.78	23
Jan-2009	94.27	90.57	90.34	92.84	89.19	88.97	22
Feb-2009	101.08	102.03	102.20	109.51	110.53	110.71	20
Mar-2009	112.43	115.21	115.43	110.72	113.46	113.68	22
Apr-2009	102.22	103.44	103.39	100.68	101.87	101.83	22
May-2009	96.59	98.85	99.00	99.66	101.99	102.14	21
Jun-2009	106.74	110.34	110.53	105.12	108.67	108.85	22
Jul-2009	77.42	78.59	78.06	72.93	74.03	73.53	23
Aug-2009	102.49	99.09	99.41	105.74	102.24	102.57	21
Sep-2009	105.90	104.78	104.97	104.30	103.19	103.38	22
Oct-2009	116.37	111.57	111.36	114.61	109.88	109.67	22
Nov-2009	96.32	95.41	95.61	99.37	98.44	98.65	21
Dec-2009	86.88	88.16	87.71	81.84	83.05	82.63	23
Jan-2010	94.45	91.12	90.94	97.45	94.01	93.83	21
Feb-2010	101.00	102.07	102.23	109.41	110.58	110.75	20
Mar-2010	117.46	120.68	120.89	110.66	113.68	113.88	23
Apr-2010	103.73	105.15	105.11	102.16	103.55	103.52	22
May-2010	97.79	99.74	99.90	100.90	102.91	103.07	21
Jun-2010	106.34	110.01	110.18	104.73	108.34	108.51	22
Jul-2010	74.82	72.21	71.55	73.69	71.11	70.47	22
Aug-2010	106.68	107.62	108.22	105.06	105.99	106.58	22
Sep-2010	106.61	105.46	105.67	104.99	103.86	104.06	22
Oct-2010	111.82	106.40	106.17	115.37	109.77	109.54	21
Nov-2010	98.31	97.16	97.34	96.82	95.69	95.87	22
Dec-2010	86.77	87.98	87.46	81.74	82.88	82.39	23
Jan-2011	99.35	96.51	96.38	102.50	99.57	99.44	21
Feb-2011	101.05	102.13	102.29	109.47	110.64	110.82	20
Mar-2011	117.57	120.95	121.14	110.75	113.94	114.12	23
Apr-2011	98.42	99.73	99.71	101.54	102.89	102.88	21
May-2011	102.65	104.36	104.51	101.09	102.77	102.93	22
Jun-2011	105.73	109.54	109.68	104.13	107.88	108.02	22
Jul-2011	71.22	72.61	72.25	73.48	74.92	74.54	21
Aug-2011	113.18	109.95	110.45	106.62	103.57	104.05	23
Sep-2011	105.55	104.41	104.57	103.95	102.82	102.99	22
Oct-2011	112.47	106.63	106.39	116.04	110.01	109.77	21
Nov-2011	101.58	100.12	100.28	100.04	98.60	98.76	22
Dec-2011	86.47	87.66	87.07	85.16	86.33	85.75	22
Jan-2012	99.28	97.34	97.27	97.78	95.87	95.79	22
Feb-2012	106.29	107.28	107.44	109.66	110.69	110.85	21
Mar-2012	112.46	115.92	116.11	110.75	114.17	114.35	22
Apr-2012	98.24	99.28	99.30	101.36	102.43	102.45	21
May-2012	107.75	108.92	109.08	101.51	102.60	102.76	23
Jun-2012	100.47	104.09	104.17	103.66	107.40	107.48	21
Jul-2012	70.85	76.17	75.78	69.78	75.01	74.63	22
Aug-2012	113.79	109.66	110.17	107.19	103.31	103.79	23
Sep-2012	98.69	95.49	95.74	106.92	103.45	103.71	20
Oct-2012	123.66	117.17	116.89	116.49	110.38	110.12	23
Nov-2012	98.27	96.44	96.55	96.78	94.98	95.09	22
Dec-2012	75.97	76.98	76.43	78.38	79.42	78.85	21
Jan-2013	104.19	102.91	102.88	98.15	96.94	96.92	23
Feb-2013	101.33	102.15	102.30	109.78	110.66	110.82	20
Mar-2013	102.12	105.56	105.72	105.37	108.91	109.08	21
Apr-2013	108.18	108.99	109.01	106.54	107.34	107.36	22
May-2013	108.04	108.55	108.69	101.78	102.26	102.39	23
Jun-2013	95.52	98.79	98.83	103.48	107.02	107.07	20
Jul-2013	78.08	80.60	80.25	73.56	75.93	75.60	23
Aug-2013	108.59	105.07	105.58	106.95	103.48	103.98	22
Sep-2013	100.30	100.03	100.27	103.48	103.21	103.45	21

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