When:
13th May 2020 – 31st May 2020 all-day
2020-05-13T00:00:00+01:00
2020-06-01T00:00:00+01:00

From the middle to the end of May  Noctilucent or Night shining Clouds,

should start appearing in the  sky

and should be visible during astronomical twilight

  Noctilucent Cloud are formed by ice crystals in the upper atmosphere

If you plan to observe / image Noctilucent clouds please dress for the conditions