This sentence may be a part of a song or a poem, and its meaning and interpretation may vary from person to person, but you can usually feel the poet or singer's thoughts and feelings about memory and time, as well as the cherish and nostalgia for the lost time and good memories.
Among them, "I will always remember the summer wind" may refer to the memory of a good time or the impression of someone, while "the cold in winter will remind me of the summer sun" expresses my yearning for good memories. The whole sentence may express a sigh over the passage of time and the changes of life, as well as cherish and recall the good memories.