Variable data in header?

I am somewhat new to ionic and am trying to add a temperature to the header of every page using a json feed that I get using http.get. What are the best practices for placing this kind of dynamic data into the header?

I would use filter which takes whatever values u give and returns with degree

On html

{{ myValueFromHTTP | myFilter}}

On JavaScript

.filter(‘myFilter’, function(x){
X = x+“°”;
Return x;