What format is used to import weather icon?

I want to add some icons to my watch face for weather, temperature, etc… Do I need a bitmap or a vector file of the icon to add to my drop down creator list? Also, how do I add additional ttf fonts?

You should add icons as bitmap(raster) images, then use tags to have them show up. We have a deprecated wiki with the info for how to do this: http://wiki.getfacer.com/wiki/Custom_Weather_Icons

let me know if this helps.