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my @hours; # so we have a permanent variable with our data
while (my @row = $sth->fetchrow_array) { push(@hours, $_) for @row }
...
}

foreach (keys %byhour) { print "$_ had $byhour{$_}<br>"; }

10 had 2
15 had 21
14 had 4

0 had 0
1 had 0
...
15 had 23
16 had 0
.. skip..