In the summer months, residents of temperate latitudes can observe noctilucent clouds with some luck. They are very beautiful, and because of this they are sometimes mistaken for the polar lights. Noctilucent clouds appear in the mesosphere at heights of 75 to 85 kilometers. They become visible when the sun illuminates them from behind the horizon, while the lower layers of the atmosphere are in shadow. That is why noctilucent clouds are observed only in the summer and only at moderate latitudes (between 43 ° and 65 °).
The above timeline was compiled by photographer Adrien Mauduit. It depicts the noctilucent clouds observed in 2016.