Are there clouds in the mesosphere?

What are notilucent clouds? Noctilucent clouds form in the highest reaches of the atmosphere – the mesosphere – as much as 50 miles (80 km) above the Earth's surface. ... They can only form when temperatures are incredibly low and when there's water available to form ice crystals. read more

Yes! And not just in the mesosphere, but way up near the top of it! They are called noctilucent clouds, and the conditions under which they form are pretty extreme. Also, they are gorgeous if you can manage to catch a glimpse. read more

Noctilucent clouds form mostly near the polar regions, because the mesosphere is coldest there. Clouds in the southern hemisphere are about 1 km (0.62 mi) higher than those in the northern hemisphere. Ultraviolet radiation from the Sun breaks water molecules apart, reducing the amount of water available to form noctilucent clouds. read more

These peculiar clouds form much, much higher up than other types of clouds. The mesosphere, like the stratosphere below it, is much drier than the moist troposphere we live in; making the formation of clouds in this layer a bit of a surprise. read more