Summer 2025. When is the first day of calendar and astronomical summer? The longest day of the year

In 2025, the moment of summer solstice will fall exactly on June 21 at 4.43 Central European Summer Time. This hour indicates the longest day of the year, when the sun dominates in the zenith over the tiller of cancer. From that moment, days in the northern hemisphere will become shorter.

During the summer solstice in the northern hemisphere we observe the longest days and the shortest nights of the year. However, the exact length of the day and night depends on the place where we are. The inhabitants of northern Poland will experience the longest day – in Gdańsk It will last up to 17 hours and 13 minutes. In the south of Poland, on the other hand, the longest day of the year will last almost an hour less – 16 hours and 14 minutes in Zakopane.

Check also: Summer “woven from hot and cold waves”. What do models say?

In the northern hemisphere, the calendar summer always starts on June 22 and lasts until September 23. This period has been established to facilitate observation of weather phenomena. There is also a concept of meteorological summer. Each time it starts on June 1 and ends on August 31.