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  • $\begingroup$ Are you using 10.1? In 10.0.2 this throws errors. wd[[All, 1]] is not valid. $\endgroup$ Commented Apr 12, 2015 at 21:07
  • $\begingroup$ @MrWizard, i am using version 9.0.1.0 (windows 8 64bit). $\endgroup$ Commented Apr 12, 2015 at 21:08
  • $\begingroup$ It looks like we have an incompatible change. Do you have time to Chat? $\endgroup$ Commented Apr 12, 2015 at 21:10
  • $\begingroup$ @kguler when trying wd = WeatherData["WMO89009", "Temperature", {"Jun. 1, 2014", "Dec. 1, 2014", "Day"}]; proposed solution seems not to work (see missing grid line between week 6 and 7 and gap in week 8). It looks like that ticks and GridLines are dependent on data being systematically available for Sundays and Wednesday. Or am I missing something ? $\endgroup$ Commented Apr 14, 2015 at 13:27
  • $\begingroup$ @penguin77, you are right; I assumed there are no gaps in the data. If there are gaps ticks and gridlines can be off, so can the splitting into weeks. A more robust way would be to use DateRange of the data to identify Wednesday and Sunday dates:, e.g., wednesdays = Pick[DateRange[wd[[1, 1]], wd[[-1, 1]]], DayName /@ DateRange[wd[[1, 1]], wd[[-1, 1]]], Wednesday]; sundays = Pick[DateRange[wd[[1, 1]], wd[[-1, 1]]], DayName /@ DateRange[wd[[1, 1]], wd[[-1, 1]]], Sunday]; $\endgroup$ Commented Apr 14, 2015 at 13:51