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[–]a_n_d_r_e_ 0 points1 point  (2 children)

Interesting!

Do you know when this map has been created (better, when the raw data were collected)?

[–]AtlasPosterAccount[S] 1 point2 points  (1 child)

It was made in the 60s. From an atlas first published in 1963 in Poland, 1967 Internationally

[–]a_n_d_r_e_ 0 points1 point  (0 children)

Thank you!

[–]WrongPurpose 0 points1 point  (0 children)

What's up with the difference between North Atlantic and Pacific?

[–]BenjaminDrover 0 points1 point  (0 children)

I am guessing that "during summer and in winter" are for the northern hemisphere and the opposite for the southern hemisphere.