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HTML 

              
                
<div id="header">ANIMATED WEATHER ICONS</div>
<div class="grid">  
   
    <div id="sunny_weather" class="grid__item">
      <div id="sun"></div>
    </div>
    <div id="sunny_cloudy_weather" class="grid__item">
      <div id="cloud" class="cloud_top cloud_regular"></div>
      <div id="sun"></div>
      <div id="cloud" class="cloud_bottom cloud_regular"></div>
    </div>
    <div id="cloudy_weather" class="grid__item">  
      <div id="cloud" class="cloud_right cloud_regular"></div>
      <div id="cloud" class="cloud_center cloud_regular"></div>
      <div id="cloud" class="cloud_left cloud_regular"></div>
    </div>
    <div id="rainy_weather" class="grid__item">
      <div id="cloud" class="cloud_right cloud_regular"></div>
      <div id="cloud" class="cloud_center cloud_regular"></div>
      <div id="rain" class="rain_regular"></div>
    </div>
    <div id="storm_weather" class="grid__item">
      <div id="cloud" class="cloud_right cloud_storm"></div>
      <div id="cloud" class="cloud_center cloud_storm"></div>
      <div id="rain" class="rain_storm"></div>
    </div>
    <div id="snowy_weather" class="grid__item">
      <div id="cloud" class="cloud_right cloud_regular"></div>
      <div id="cloud" class="cloud_center cloud_regular"></div>
      <div id="snow_flake" class="snow_flake_1">&#x2744;</div>
      <div id="snow_flake" class="snow_flake_2">&#x2744;</div>
      <div id="snow_flake" class="snow_flake_3">&#x2744;</div>
      <div id="snow_flake" class="snow_flake_4">&#x2744;</div>
    </div>
   
</div>
!

CSS 

              
                
@import url('https://fonts.googleapis.com/css?family=Dosis:800');

/* VARIABLES */

$cloud_white: #E7E9EE;
$cloud_gray: #8fa0bc;
$cloud_black: #040D22;


/* MIXINS */

@mixin cloud-before-after($h, $w, $t, $l, $tl-rad, $tr-rad) {
  height: $h;
  width: $w;
  top: $t;
  left: $l;
  border-top-left-radius: $tl-rad;
  border-top-right-radius: $tr-rad;
}

@mixin cloud-position($t, $l) {
  top: $t;
  left: $l;
}

@mixin rain-storm-before-after($fs, $t, $l) {
  font-size: $fs;
  top: $t;
  left: $l;
}


/* HTML BODY GRID HEADER */

html, body {
  width: 100vw;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background: white;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
		grid-auto-rows: minmax(26vh, 190px);
  
}

.grid__item {
  background: white;
  padding: 1em;
  margin: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack:center;
      -ms-flex-pack:center;
          justify-content:center;

} // .grid-item

#header {
  font-family: 'Dosis', sans-serif;
  font-size: 2em;
  color: $cloud-gray;
  text-align:center;
  line-height: 3;
}



/* SUN */

#sun {
  height: 100px;
  width: 100px;
  position: relative;
  background-image: -webkit-radial-gradient(75px 75px, circle cover, orange, yellow);
  border: 5px solid #f7f14c;
  border-radius: 50%;
  margin: 0 auto;
  
  &:before {
    content: '';
    height: 130px;
    width: 130px;
    position: absolute;
    top: -43px;
    left: -43px;
    background: transparent;
    opacity: 0;
    border: 30px solid #f7f14c;
    border-radius: 50%;
    -webkit-animation: pulse 3s ease-out;
    animation: pulse 3s ease-out;
    -webkit-animation-iteration-count: infinite;
    animation-iteration-count: infinite;
   }
  
} // #sun


/* CLOUDS */

#cloud {
  height: 40px;
  width: 120px;
  border-radius: 2em;
  position: relative;
  opacity: 0.9;
  -webkit-animation: clouds 2s;
  animation: clouds 2s;
  
  
  &:before, &:after {
    content: '';
    background: $cloud-gray;
    border-top: 0.15em solid $cloud-white;
    position: absolute;
    z-index: 0;
  }
  
  &:before {
    @include cloud-before-after(25px, 50px, -26px, 55px, 25px, 25px)
  }
  
  &:after {
    @include cloud-before-after(35px, 70px, -36px, 12px, 35px, 35px)
  }
  
}

.cloud_left {
  @include cloud-position(20%, -25%);
  -webkit-box-shadow:-30px 40px 20px 1px $cloud_gray;
          box-shadow:-30px 40px 20px 1px $cloud_gray;
}
.cloud_right {
  @include cloud-position(13%, 22%);
}

.cloud_center {
  @include cloud-position(0%, 0%);
}

.cloud_top {
  @include cloud-position(0%, 45%);
  z-index: 1;
}

.cloud_bottom {
  @include cloud-position(20%, -45%);
}

.cloud_regular {
  background: -webkit-linear-gradient(top, $cloud-gray 5%,  $cloud-white 100%);
}
.cloud_storm {
  background: -webkit-linear-gradient(top, $cloud-gray 5%,  $cloud-black 100%);
}


/* RAIN */

#rain {
  content:'';
  height: 70px;
  width: 90px;
  z-index: 0;
  left: -130px;
  top: 40px; 
  position: relative;
  -webkit-transform: skew(-20deg);
	   -moz-transform: skew(-20deg);
	     -o-transform: skew(-20deg);
  -webkit-animation: rain 3s, rainfall 3s infinite;
  animation: rain 3s, rainfall 3s infinite;
  -webkit-animation-delay: 0s, 4s;
          animation-delay: 0s, 4s;
  
}

.rain_regular {
  background: -webkit-linear-gradient(top, transparent 5%, #9CCAEE 100%);
}

.rain_storm {
  background: -webkit-linear-gradient(top, transparent 5%, #C0C0C0 100%);
  
  &:before,
  &:after {
    content:'\002301';
    width: 30px;
    height:30px;
    color: yellow;
    position: absolute;
    -webkit-transform: rotate(60deg);
       -moz-transform: rotate(90deg);
         -o-transform: rotate(90deg);
  }

  &:before {
    @include rain-storm-before-after (6em, -10%, 110%);
    -webkit-animation: lightning 2s linear infinite;
            animation: lightning 2s linear infinite;
}

  &:after {
    @include rain-storm-before-after (3em, 50%, 40%);
    -webkit-animation: lightning 1.5s linear infinite;
            animation: lightning 1.5s linear infinite;
  }
  
} // .rain_storm


/* SNOWFLAKES */

#snow_flake {
  content:'\002744';
  background: transparent;
  color: #C0C0C0;
  position: relative;
  top: 15%;
  left: -20%;
  opacity: 0; 
}

.snow_flake_1 {
  font-size: 1.5em;
  -webkit-animation: snowflake 3s linear infinite;
          animation: snowflake 3s linear infinite;
}

.snow_flake_2 {
  font-size: 2em;
  -webkit-animation: snowflake 3.5s linear infinite;
          animation: snowflake 3.5s linear infinite;
}

.snow_flake_3 {
  font-size: 2.5em;
  -webkit-animation: snowflake 4s linear infinite;
          animation: snowflake 4s linear infinite;
}

.snow_flake_4 {
  font-size: 2em;
  -webkit-animation: snowflake 4.5s linear infinite;
          animation: snowflake 4.5s linear infinite;
}


/* ANIMATIONS */

@-webkit-keyframes "pulse" {
  0% {-webkit-transform: scale(0); opacity: 0.0;}
  25% {-webkit-transform: scale(0); opacity: 0.0; }
  50% {-webkit-transform: scale(0.3); opacity: 0.0; }
  75% {-webkit-transform: scale(0.8); opacity: 0.5; }
  100% {-webkit-transform: scale(1); opacity: 0.0; }
}

@keyframes "pulse" {
  0% {-webkit-transform: scale(0); opacity: 0.0;}
  25% {-webkit-transform: scale(0); opacity: 0.0; }
  50% {-webkit-transform: scale(0.3); opacity: 0.0; }
  75% {-webkit-transform: scale(0.8); opacity: 0.5; }
  100% {-webkit-transform: scale(1); opacity: 0.0; }
}

@-webkit-keyframes clouds {
  0%   {opacity: 0.0; left:1px;}
  25%  {opacity: 0.25;}
  50%  {opacity: 0.5;}
  75%  {opacity: 0.75;}
  100% {opacity: 0.9;}
}

@keyframes clouds {
  0%   {opacity: 0.0; left:10%;}
  25%  {opacity: 0.25;}
  50%  {opacity: 0.5;}
  75%  {opacity: 0.75;}
  100% {opacity: 0.9;}
}

@-webkit-keyframes rain {
  0%   {opacity: 0.0;}
  25%  {opacity: 0.0;}
  50%  {opacity: 0.0;}
  75%  {opacity: 0.5;}
  100% {opacity: 0.9;}
}

@keyframes rain {
  0%   {opacity: 0.0;}
  25%  {opacity: 0.0;}
  50%  {opacity: 0.0;}
  75%  {opacity: 0.5;}
  100% {opacity: 0.9;}
}

@-webkit-keyframes rainfall {
  50%  {opacity: 0.5;}
  100% {opacity: 0.9;}
}

@keyframes rainfall {
  50%  {opacity: 0.5;}
  100% {opacity: 0.9;}
}

@-webkit-keyframes lightning {
  45%  {opacity: 0.0;}
  50%  {opacity: 1.0;}
  55%  {opacity: 0.5;}
  60%  {opacity: 0.0;}
}

@keyframes lightning {
  45%  {opacity: 0.0;}
  50%  {opacity: 1.0;}
  55%  {opacity: 0.5;}
  60%  {opacity: 0.0;}
}

@-webkit-keyframes snowflake {
  35%  {opacity: 0.0;}
  45%  {opacity: 0.5; top: 15%;  left: -30%;}
  55%  {opacity: 1.0; top: 18%;  left: -27%;}
  65%  {opacity: 1.0; top: 21%;  left: -24%;}
  75%  {opacity: 0.75; top: 24%;  left: -27%;}
  80%  {opacity: 0.25; top: 27%;  left: -30%;}
  90%  {opacity: 0.0; top: 30%;  left: -27%;}
}

@keyframes snowflake {
  35%  {opacity: 0.0;}
  45%  {opacity: 0.5; top: 15%;  left: -30%;}
  55%  {opacity: 1.0; top: 18%;  left: -27%;}
  65%  {opacity: 1.0; top: 21%;  left: -24%;}
  75%  {opacity: 0.75; top: 24%;  left: -27%;}
  80%  {opacity: 0.25; top: 27%;  left: -30%;}
  90%  {opacity: 0.0; top: 30%;  left: -27%;}
}
!

JS 

              
                /*
TO-DO

Add flexbox for browser compatibility
*/
!
999px

Console