Midnight Sun

In the Northern Hemisphere, June has the shortest nights of the year.

Besides, the area south of the Arctic Circle to the North Pole has permanent daylight during most of this month; when at least part of the Sun's disk is visible above the horizon 24 hours of the day, we call it the midnight sun.

This event is visible at the Arctic Circle from approximately June 12th until July 1st. The number of days per year with potential midnight sun increases the farther one goes towards the North Pole. This place gets, indeed, the midnight sun for half year, since there is only one sunrise and one sunset by the time around the equinox.

During June too, many areas south of the Arctic Circle experience the white nights: there is light all night, but the sun disk is not visible for the full 24 hours.

Likewise, places from latitudes between 48.5ºN and 60ºN do not experience total darkness, since twilight continues all night. And the higher the latitude, the lighter the sky.

You can read more about it here.

Read this post in Catalan.