I noticed a couple other "tidy code" things you might want to consider.

• use strict; and use warnings; will help you find various things (though, not this bug). When you do this, you'll have to start declaring your variables (e.g., my $day; or my @dayvalues;.)
• the open statement could benefit from being the 3-parameter version:

  open PYCFILE, "<", $filename or die ...
  [download]

• It might be easier to read the file one line at a time rather than slurp the whole thing up into an array and parse the array one line at a time:

  while (my $line=<PYCFILE>) ...
  [download]

• You only need chomp to remove the newline at the end of a line. You don't have to worry about doing it for each token read from shift or each value pulled from an array.

HTH

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