A cloud near the ground.
When the water vapor
        near the ground is cooled and condenses into tiny
        water droplets.
Frost
        During the night, the temperature drops. The
        vapor in the air condenses into water onto any
Dew     exposed surfaces
        Thin white layer of ice formed on ground and
Fog     exposed surfaces. When the air temperature falls
        below freezing point
        Formed when the temperature is below the
Snow    freezing point of water. The water vapor in the air
        turns directly into solid crystals without going
        through the liquid state.
Rain     Falls in the form of lumps of ice. Updrafts of warm
         air and downdrafts of cool air move frozen water
         droplets up and down through the clouds.
Hail
          Water falling from the sky when the temperature
          is above 0 C. It occurs when the water droplets in
          the clouds accumulate and form bigger droplets.