Added comments for each function.

sass/partials/_functions.scss

@@ -1,4 +1,5 @@
-// Functions for fixing unicode characters
+// Functions for fixing unicode characters see link below if any questions
+// https://github.com/sass/sass/issues/1395#issuecomment-57658736
 @function unicode($str){
     @return unquote("\"")+unquote(str-insert($str, "\\", 1))+unquote("\"")
 }

sass/partials/_mixins.scss

@@ -1,34 +1,64 @@
-// Mixin for handle rotation of degrees
+// Mixin for handle fallback support for transform-rotation
+// We use it to rotate the degrees of the wind icon
 @mixin wind-rotate($degrees) {
-  -webkit-transform: rotate($degrees);
-  -moz-transform: rotate($degrees);
-  -ms-transform: rotate($degrees);
-  -o-transform: rotate($degrees);
-  transform: rotate($degrees);
+
+    -webkit-transform: rotate($degrees);
+    -moz-transform: rotate($degrees);
+    -ms-transform: rotate($degrees);
+    -o-transform: rotate($degrees);
+    transform: rotate($degrees);
+
 }
 
-// Function for printing out classes for weather icons
+// Function for outputing all classes for weather icons
 @mixin icons($collection) {
 
+    // Get the length of collection and store it in a variable for reusing
     $length: length($collection);
+    // Loop throug all the variables in collection
     @for $i from 0 to $length {
+
+        // Get the current collection item
         $tmp: nth($collection, $i+1);
+
+        // Get the class name from the variable collection
         $name: nth($tmp, 1);
+        
+        // Get the value of the value collection
         $val: nth($tmp, 2);
+
+        // Output the content based on the variables in the collection
         .#{$weather-icons-prefix}-#{$name}:before {
+
+            // Output the unicode character through the unicode function.
+            // For more information see the partials/_functions.scss
             content:unicode($val);
         }
+
     }
 
 }
 
-// Create all rotations based on steps
+// Output all the rotation classes based on the step and how long we should go.
+// $step – How big of a step should we take between each degree
+// $max – How far should we go about this degree
 @mixin wind-rotations($step,$max) {
+
+    // Get how many classes we should make based on the input
     $length: $max/$step;
+
+    // Loop through all the steps to output the classes
     @for $i from 0 to $length+1 {
+
+        // Calculate what is the next step based on the step and how many times the loop has run
         $currStep: $i*$step;
+
+        // Print out the echo
         .#{$weather-icons-prefix}-wind-default._#{$currStep}-deg {
+            // We use the wind rotate mixin for this
             @include wind-rotate(#{$currStep}deg);
         }
+
     }
+    
 }

sass/partials/_variables.scss

@@ -4,8 +4,14 @@ $WeatherIconVersion:          "1.3.0";
 $weather-icons-prefix:         wi;
 $weather-icons-font-family:    weathericons;
 
-// Glyph Names
+
+// Create a collection of all the names and variables to use in a loop later on.
+
+// Note that the unicode character should be written without the "\" we adds that later
+// Example: "\f000" should be "f000" and we output the rest.
+// For more information see "partials/functions.scss"
 $collection:
+// Glyph Names
 ("day-cloudy-gusts", "f000")
 ("day-cloudy-windy", "f001")
 ("day-cloudy", "f002")