handler.js

exports.handler = function( event, context ) {

    var http = require( 'http' );

    var url = 'http://api.openweathermap.org/data/2.5/weather?zip=<YOURZIPCODEHERE>,us&units=imperial&APPID=<YOURAPIKEYHERE>';

    http.get( url, function( response ) {

        var data = '';

        response.on( 'data', function( x ) { data += x; } );

        response.on( 'end', function() {

            var json = JSON.parse( data );

            var temp = json.main.temp;
            
            var wind_speed = json.wind.speed;
            
            var wind_chill = 35.74 + 0.6215*temp - 35.75*Math.pow(wind_speed, 0.16) + 0.4275*temp*Math.pow(wind_speed, 0.16);
            
            var chill_rounded = Math.round( wind_chill * 10 ) / 10;

            var text = 'Outside with wind chill the temperature feels like ';
            text+=chill_rounded+" degrees fahrenheit.";
            output( text, context );

        } );

    } );

};