Figure 9: Monthly Variation in Houston's Weekday and Weekend Congested Hours due to Seasonal Factors.

Figure 9: Monthly Variation in Houston's Weekday and Weekend Congested Hours due to Seasonal Factors.

Difference in congested hours per day from the trendline

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  Houston Weekday seasonality Houston Weekend seasonality
Jan –0.216294028 –0.104697934
Feb –0.029454818 0.115669784
Mar 0.186789726 0.109962169
Apr 0.21790421 0.029985412
May –0.129583329 0.213240213
Jun –0.204731169 –0.03155596
Jul –0.303147959 0.006868758
Aug 0.041288585 0.031879142
Sep 0.455383463 –0.124299473
Oct 0.349822007 –0.090427088
Nov 0.309430884 –0.139193037
Dec –0.677407572 –0.017431985

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