Fixed bugs with sizing, added some attributions.

scss/_core.scss

@@ -1,6 +1,8 @@
 // base class definition
 // --------------------------
 
+// lifted from FontAwesome
+// https://github.com/FortAwesome/Font-Awesome/blob/6549e2920b0a27213b895200becc485ab01e9974/scss/core.scss
 .#{$wi-css-prefix} {
 
   display: inline-block;

scss/_font.scss

@@ -1,6 +1,8 @@
 // icon font
 // --------------------------
 
+// lifted from FontAwesome
+// https://github.com/FortAwesome/Font-Awesome/blob/6549e2920b0a27213b895200becc485ab01e9974/scss/path.scss
 @font-face {
 
   font-family: 'WeatherIcons';

scss/_functions.scss

@@ -1,7 +1,39 @@
 // functions
 // --------------------------
 
-@function strip-units($number) {
+// extract the number from a unit
+@function unitless($number) {
 
   @return $number / ($number * 0 + 1);
 }
+
+// fudge a number to an accuracy of n <= 6 decimal places
+@function fudge($number, $places: 0) {
+
+  $fraction: 10;
+  $number: unitless($number);
+  $return: null;
+
+  @if $places == 0 {
+
+    @return round($number);
+
+  } @else {
+
+    @if $places > 6 {
+
+      $places: 6;
+    }
+
+    // how sweet life could be with some simple trig... no loop necessary
+    // $fraction: (10 ^ $places);
+    // @return round($number * $fraction) / $fraction;
+
+    @for $i from 1 through $places {
+
+      $fraction: $fraction * 10;
+    }
+
+    @return round($number * $fraction) / $fraction;
+  }
+}

scss/_sizes.scss

@@ -6,8 +6,8 @@
 
   .#{$wi-css-prefix}-#{$wi-icon-scale-name} {
 
-    font-size: ($wi-font-size-base / strip-units($wi-font-size-base * $wi-icon-scale));
-    line-height: ($wi-font-size-base * $wi-icon-scale / strip-units($wi-font-size-base));
+    font-size: #{fudge(unitless($wi-font-size-base) * $wi-icon-scale)}px;
+    line-height: #{fudge(unitless($wi-font-size-base) * $wi-icon-scale * 0.75)}px;
     vertical-align: -15%;
   }
 }
@@ -17,6 +17,6 @@
 
   .#{$wi-css-prefix}-#{$wi-icon-multiplier-name} {
 
-    font-size: ($wi-font-size-base * $wi-icon-multiplier);
+    font-size: #{fudge($wi-font-size-base * $wi-icon-multiplier)}px;
   }
 }