The Meteo module from Philips' website is already configured for metric measurements. The number you are seeing in the center of the five horizontal icons is a number that should not display. The five numbers across the top are the high temperatures, and the five across the bottom are the low temperatures.

To hide the text overlay on each icon, double-click the panel that the icon is in, select the "Label" tab, and change the "Font Size" to [NONE].

This only applies if you have downloaded the same PS module that I did. I have found a few different modified versions of the same module, but nobody bothered to change the actual version number or add mod info.