Federal Reserve Statistical Release, G.17, Industrial Production and Capacity Utilization; title with eagle logo links to Statistical Release home page
Release Date: October 16, 2009
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Federal Reserve Seasonal Factors for Domestic Auto and Truck Production

Seasonal factors for auto and truck production have been reestimated using final production data through September 2009. Factors were revised for April 2009 through December 2009 and have been extended through September 2010. Seasonal factors for months prior to April 2009 will revise at the time of the annual revision to the index of industrial production, currently planned for the end of March 2010.

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  94.47  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  98.26 105.80 106.01  96.77 104.40 104.20 22
May-2009  90.25 101.24 101.37  93.12 104.45 104.58 21
Jun-2009 104.20 115.24 115.77 102.62 113.49 114.02 22
Jul-2009  80.17  76.45  75.84  75.52  72.02  71.44 23
Aug-2009 106.73  98.80  99.00 110.11 101.94 102.14 21
Sep-2009 111.54 105.40 105.47 109.85 103.80 103.87 22
Oct-2009 119.87 112.38 112.33 118.05 110.68 110.63 22
Nov-2009 100.04  97.99  98.33 103.22 101.10 101.45 21
Dec-2009  89.61  90.37  90.23  84.42  85.13  85.00 23
Jan-2010  94.04  85.22  84.63  97.02  87.92  87.31 21
Feb-2010  97.27  98.82  98.85 105.38 107.05 107.09 20
Mar-2010 111.24 115.64 115.95 104.80 108.94 109.22 23
Apr-2010  99.41 107.07 106.84  97.91 105.45 105.22 22
May-2010  90.66 102.66 102.80  93.54 105.92 106.07 21
Jun-2010 103.70 115.60 116.17 102.12 113.85 114.41 22
Jul-2010  74.09  67.25  66.33  72.97  66.23  65.32 22
Aug-2010 113.20 105.76 106.12 111.49 104.15 104.51 22
Sep-2010 115.38 109.95 110.30 113.64 108.28 108.63 22

October 16, 2009
Industrial Output Section
Division of Research and Statistics
Board of Governors of the Federal Reserve System
Washington D.C. 20551


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