My guess is that you mean you want execution to stop before your get to question #2. In order for that to hold, you need to test the value of $weather before your execute your next print. Perhaps you mean something more like:

#!/usr/bin/perl
# walkies.pl
use warnings;
use strict;

print "What's the weather like outside? ";
chomp(my $weather = <STDIN>);
if ($weather eq "snowing") {
    print "OK, let's go!\n";
    exit;
} elsif ($weather eq "raining") {
    print "No way, sorry, I'm staying in.\n";
    exit;
}

print "How hot is it, in degrees Celsius? ";
my $temperature = <STDIN>;
if ($temperature < 18) {
    print "Too cold for me!\n";
    exit;
}

print "And how many emails left to reply to? ";
my $work = <STDIN>;
if ($work > 30) {
    print "Sorry - just too busy.\n";
} else {
    print "Well, why not?\n";
}
[download]

If you want to avoid explicit exits, you could do the same thing with nested if-elsif-else's:

#!/usr/bin/perl
# walkies.pl
use warnings;
use strict;

print "What's the weather like outside? ";
chomp(my $weather = <STDIN>);
if ($weather eq "snowing") {
    print "OK, let's go!\n";
} elsif ($weather eq "raining") {
    print "No way, sorry, I'm staying in.\n";
} else {
    print "How hot is it, in degrees Celsius? ";
    my $temperature = <STDIN>;
    if ($temperature < 18) {
        print "Too cold for me!\n";
    } else {
        print "And how many emails left to reply to? ";
        my $work = <STDIN>;
        if ($work > 30) {
            print "Sorry - just too busy.\n";
        } else {
            print "Well, why not?\n";
        }
    }
}
[download]

There are a multitude of other ways to do this, but it all comes down to thinking about the logical progression of what you want to accomplish.

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