As always, this module is XHTML/CSS compliant and cross-browser compatible, tested on IE6+, Firefox, Opera, Google Chrome and Safari.
should of use postal codes as well
This is not true. You should go to http://www.weatherlet.com/ and enter city name. In the code snippet, you'd get code for the city. In example, code for London is UKXX0085 and I believe London is not in the USA. ;)