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  • BBC Sky at Night

    THE BIG THREE

    May 18, 2023 3 minutes

    DON’T MISS

    Noctilucent cloud season

    BEST TIME TO SEE: All month, 90-120 minutes after sunset or a similar time before sunrise

    June and July are the best months to try to spot elusive noctilucent, or night-shining, clouds (NLCs). These are high-altitude ice sheet clouds that form in a narrow layer within the atmospheric region known as the mesosphere. In order for them to appear, there has to be some form of seeding agent in this layer and there has to be super-cooled water vapour present.

    The theory as to how water vapour gets up into the mesosphere

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