because the clouds are filling up with water so they become more denser so the light from the sun can't get through or less get through.
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The color of the sky when it's raining can vary, but it is often gray or dark gray due to the thick cloud cover that accompanies rainstorms. The rain clouds block sunlight, making the sky appear darker than when it is clear and sunny.
The sky can appear gray or dark when it is raining due to the thickness of rain clouds blocking out sunlight. The presence of water droplets in the air can also scatter light, leading to a hazy or diffused look to the sky during rainfall.
A gray sky is like a blank canvas, devoid of color and emotion, waiting to be filled with the palette of the day.
The sky can turn green or brownish-gray during a tornado because of the way light interacts with the storm's clouds and precipitation. This color change may be due to the scattering of sunlight by the water droplets or debris within the storm, giving the sky a unique hue. It's a warning sign that severe weather is approaching.
In order to see a rainbow, you must have the sun behind you in clear sky, and rain or heavy mist in the air in front of you. If it's raining on you, then most likely the sun is not in clear sky behind you, and you can't see very far in front of you.