Figure 4: Monthly Variation in Chicago's a.m. and p.m. Congested Hours due to Seasonal Factors

Figure 4: Monthly Variation in Chicago's a.m. and p.m. Congested Hours due to Seasonal Factors

Difference in congested hours per day from the trendline

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  Chicago a.m. seasonality Chicago p.m. seasonality
Jan –0.245165442 –0.605827169
Feb –0.084182157 –0.147749343
Mar 0.035632796 0.003986149
Apr –0.110858715 –0.273936229
May 0.225472607 0.140869226
Jun 0.239583226 0.286036385
Jul 0.080465845 0.156858877
Aug 0.075731797 0.162688703
Sep 0.317944749 0.356786195
Oct 0.307007035 0.239467687
Nov 0.032339987 –0.161825154
Dec –0.873971728 –0.157355328

SOURCE: Calculated from data used in preparation of Federal Highway Administration, Urban Congestion Report, April 2004-April 2007.