That phenomenon is called "Moonbow". Moonbow (or lunar rainbow or white rainbow) is a rainbow which is formed by sunlight's reflection to the moon and that reflection, is refracted by water droplets. Moonbow can happen in anywhere, as long as the requirements are available.
But, because moonbow is only using the reflection of sunlight, it is looked blur and not as strong as rainbow. Sometime, moonbow only appears as white light around the moon.
Moonbow needs a few requirements, such as the moonlight has to be strong enough. It is happened at nearly eclipse or at eclipse. The moon has to be at 42^ or lower and the sky has to be clear and not cloudy. For your information, if the water droplets are moving toward the moon, it will make the moonbow looked stronger.
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