You could... 

LINE:
 while(<IFH>) {
      chomp;
      my($nx,$ny) = split;

      next LINE if ($ny <= 1.0);

      CONDITION:
      foreach my $cond_ref ( @range_destination ) {
          my ( $min, $max, $dest ) = @$cond_ref;
          if ( $nx > $min && $nx < $max ) {
              $capVal_Hash{$dest}{$nx} = $ny;
              last CONDITION;
          }
      }
}

[download]

One loop instead of two will save some time, I reckon.

If you know the frequency of values in your input, you can also order the @range_destination list so that the more frequent conditions are first, short circuiting the CONDITION loop faster.

In reply to Also, why two loops? by kyle
in thread better way to printing random hash key and its value by garbage777

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