Will there be a rainbow during snowfall?

Ice crystals - not snow, but they may appear in the same weather - can act just like tiny prisms in the air. They will reflect each color of light in only specific directions, resulting in many different kinds of effects. Some show up as spectra, others as bright spots. read more

Strictly speaking, a rainbow is defined as only caused by raindrops. However, the exact same physics that happens in raindrops also happens in snow and ice crystals and so they can also create color patterns similar to rainbows. read more

For a rainbow to form, the light rays must pass through the water droplets and split so that the spectrum is visible. Since light cannot pass through snowflakes, there is no splitting of sunlight. However if the snowfall has water and ice mixed, there is a chance fo spotting a rainbow. read more

The only time there is a rainbow are in the cases where there is a mixture of rain and snow at the same time. read more