I wondered about the output order also, but figured it was just a typo. However if the specified order is actually wanted:

#!/usr/bin/perl -l

# http://perlmonks.org/?node_id=1186032

use strict;
use warnings;

$/ = "END\n";
my @ORDER = qw/ TIME ALT TEMP COLOR STRENGTH /;

for my $section (<DATA>)
  {
  print join ' ', map $section =~ /\b($_: \S+)/, @ORDER;
  }

__DATA__
START
TIME: 3
ALT: 3.1
TEMP: 4.3
END

START
TIME: 2.6
ALT: 8
TEMP: 1
END

START
TIME: 6.1
ALT: 7.2
COLOR: 43

STRENGTH: 7

TEMP: 9.3
END
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