The light that we get from the Sun is white and as we know, white light is composed of lights of different colors. These colors include violet, indigo, blue, green, yellow, orange and red (or VIBGYOR). These colors together constitute the visible spectrum of light. Each of these colors have different wavelength, ranging from about 700 nm for red light to about 400 nm for violet. This white light, consisting of 7 different colors, is incident on the clouds.
Clouds consist of water droplets, each of which is much bigger in size than the various color fractions of white light. When the light is incident upon these droplets, it gets scattered (a few times). The various color fractions of the white light get scattered equally and this causes all the colors to reach equally to our eyes. And hence to an observer, the clouds will appear white in color.
Hope this helps.
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