Hi all, I'm working in local with helium and trying to import simpleweather particle from sienna.
Here the steps I did, following Mr.T tutorial:
1) Copied the weather font folder and pasted it in fonts folder of helium
2) Added
@include import-font($font-family-weather);
in helium/scss/helium/styles/tipography.scss
3) Imported dependencies
in my custom/scss/custom.scss file
4) Copied these files: simpleweather.html.twig and simpleweather.yaml in custom/particles
5) Copied these file:_simpleweather.scss in custom/scss
6) Copied these files: jquery.simpleWeather.init.js and jquery.simpleWeather.js in js folder of helium
7) Put the particle in copyright section of helium
And the result is in the attached screenshot 
Attachment has been deleted
Only half- baked, because there is a big 3 where instead there should be the icon font...The weather data are correctly displayed though, because yesterday there was a big E instead of a big 3.
It should be only a problem of scss, but I can't pinpoint it, not even firebuging the Sienna website which uses the same particle and comparing to my Helium website.
Any Idea ho to solve this trouble?
SOLVED: I only needed to add this code to gantry folder/theme.yaml
Weather:
400: 'gantry-theme://fonts/weather/artill_clean_icons-webfont'
All done!