Thanks to everyone who helped me! Here's how I finally did it:

#!/usr/bin/perl -w
use strict;
use LWP::Simple;

my $html = get("http://weather.noaa.gov/weather/current/KVDF.html";)
  or die"0\n0\n";

$html =~ m/Temperature.* (.*) F \((.*) C\).* Dew Point/s or die "0\n0\n";
# yeah, it's a bit of a kludgey regex, but it works...
my $temp = $1;

$html =~ m/Relative Humidity.* (.*)%\n/s or die "0\n0\n";
my $humidity = $1;

print "$temp\n$humidity\n";

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